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Re: [CentOS] [Newbie] Reclaiming /boot space
by Simon Matter 10 Mar '11

10 Mar '11

> On Wed, Mar 9, 2011 at 10:12 AM, Simon Matter <simon.matter(a)invoca.ch> > wrote: >>> Yes...thank you for the suggestion...since that was the cause of >>> my problem in the first place!! I should have known better; all >>> I had to do was remove some of the outdated kernel files. And >>> when I did the dumb thing of deleting the /boot files, they were >>> moved into the "protected" .Trash-boot directory. >> >> OK, now let us know exactly what you have. Is it CentOS 4 as I expected? >> If so, the listing of files in /boot should look like so: >> >> [root@abc ~]# ls -laR /boot/ >> /boot/: >> total 3771 >> drwxr-xr-x 4 root root 1024 Mar 3 11:31 . >> drwxr-xr-x 24 root root 4096 Mar 3 11:37 .. >> -rw-r--r-- 1 root root 51676 Feb 18 07:41 config-2.6.9-100.EL >> drwxr-xr-x 2 root root 1024 Mar 3 11:31 grub >> -rw-r--r-- 1 root root 1364958 Mar 3 11:20 initrd-2.6.9-100.EL.img >> drwx------ 2 root root 12288 Jul 8 2005 lost+found >> -rw-r--r-- 1 root root 9371 Aug 13 2006 message >> -rw-r--r-- 1 root root 9371 Aug 13 2006 message.ja >> -rw-r--r-- 1 root root 67797 Feb 18 07:41 symvers-2.6.9-100.EL.gz >> -rw-r--r-- 1 root root 770652 Feb 18 07:41 System.map-2.6.9-100.EL >> -rw-r--r-- 1 root root 1538264 Feb 18 07:41 vmlinuz-2.6.9-100.EL >> >> /boot/grub: >> total 198 >> drwxr-xr-x 2 root root 1024 Mar 3 11:31 . >> drwxr-xr-x 4 root root 1024 Mar 3 11:31 .. >> -rw-r--r-- 1 root root 82 Aug 9 2005 device.map >> -rw-r--r-- 1 root root 7956 Aug 9 2005 e2fs_stage1_5 >> -rw-r--r-- 1 root root 7684 Aug 9 2005 fat_stage1_5 >> -rw-r--r-- 1 root root 6996 Aug 9 2005 ffs_stage1_5 >> -rw------- 1 root root 589 Mar 3 11:31 grub.conf >> -rw------- 1 root root 593 Aug 9 2005 grub.conf.orig >> -rw-r--r-- 1 root root 7028 Aug 9 2005 iso9660_stage1_5 >> -rw-r--r-- 1 root root 8448 Aug 9 2005 jfs_stage1_5 >> lrwxrwxrwx 1 root root 11 Aug 9 2005 menu.lst -> ./grub.conf >> -rw-r--r-- 1 root root 7188 Aug 9 2005 minix_stage1_5 >> -rw-r--r-- 1 root root 9396 Aug 9 2005 reiserfs_stage1_5 >> -rw-r--r-- 1 root root 3605 Aug 13 2006 splash.xpm.gz >> -rw-r--r-- 1 root root 512 Aug 9 2005 stage1 >> -rw-r--r-- 1 root root 103816 Aug 9 2005 stage2 >> -rw-r--r-- 1 root root 7272 Aug 9 2005 ufs2_stage1_5 >> -rw-r--r-- 1 root root 6612 Aug 9 2005 vstafs_stage1_5 >> -rw-r--r-- 1 root root 9308 Aug 9 2005 xfs_stage1_5 >> >> /boot/lost+found: >> total 14 >> drwx------ 2 root root 12288 Jul 8 2005 . >> drwxr-xr-x 4 root root 1024 Mar 3 11:31 .. >> >> 1) I don't know which tool you have used to move things to "Trash" but >> you >> should be aware that it may well be the case that some permissions and >> or >> file types like symlinks may not be correct after recovering from >> "Trash". >> >> 2) The directory "lost+found" can be recreated using the command >> 'mklost+found' >> >> 3) I'm not sure on how to make grub work again, but maybe some steps qre >> required after copying everything back to /boot. I hope someone else can >> give you better info about this. >> >> Simon >> >> > > > Wouldn't it have been easier to reinstall the kernel & grub, i.e.: > > yum reinstall kernel grub > > Surely if yum reinstalls it, it would re-create the permissions & > symlinks as well? Yes, only that reinstall doesn't exist in EL4 :) Simon

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keepalived+LVS
by bedo 10 Mar '11

10 Mar '11

hello, all! if i want to use lvs function of keepalived , i must install ipvsadm ? tks!

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Re: [CentOS] Server hangs on CentOS 5.5
by Michael Eager 10 Mar '11

10 Mar '11

Rudi Ahlers wrote: > As far as I can see you were giving a bucked load of advice, which you > haven't even bothered to follow yet. You're the only one who could > actually do anything about the problem. I have followed quite a bit of the advice, which I have appreciated and noted. I've set up the monitor so that it will not be blanked on a crash, installed monitoring software, and checked a number of conditions which people have suggested. No, I have not responded to the philosophical discussions about vender management, nor to the suggestions to RMA something to somebody for unknown reasons. No, I'm not going to replace RAM or capacitors here and there on the off chance that something might be bad. (But I will look for capacitors which show signs of bulging or leaking.) > No amount of suggestions made on this list will fix the problem for > you. You need to actually take apart the server and see what's going > on. I wasn't interested in anyone fixing the server for me. I did ask for suggestions on how improve the diagnostics for the problem, which several people have responded to. Again, I appreciate their suggestions greatly. As I've said, I have a list of things to check when the server is next taken down. -- Michael Eager eager(a)eagercon.com 1960 Park Blvd., Palo Alto, CA 94306 650-325-8077

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Re: [CentOS] Server hangs on CentOS 5.5
by Michael Eager 09 Mar '11

09 Mar '11

Rudi Ahlers wrote: > On Thu, Mar 10, 2011 at 12:31 AM, Michael Eager <eager(a)eagerm.com> wrote: >> Dr. Ed Morbius wrote: >> >>> If the issue is repeated but rare system failures on one of a set of >>> similarly configured hosts, I'd RMA the box and get a replacement. End >>> of story. >> I'll repeat: this is a house-made system. There's no vendor to RMA to. > > > > I don't know where you are, but in our country we can RMA anything and > everything. Apart from CPU's. So, even a cheap desktop mobo could be > RMA'd, as long as I can prove to the suppliers it's faulty, and it's > within the warrenty period I responded to Dr. Morbius' suggestion that I "RMA the box". There is vendor to RMA the box to. If I knew that it was a motherboard problem, I could RMA it. Or disk, or PSU, or network card, or whatever. But, as I've mentioned, there's no indication what causes the system to hang. There is no way at this point to prove that it is a defective motherboard. -- Michael Eager eager(a)eagercon.com 1960 Park Blvd., Palo Alto, CA 94306 650-325-8077

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[Newbie] Reclaiming /boot space
by Todd Cary 09 Mar '11

09 Mar '11

When trying to do a yum update, I am told I need more space in /boot. When I check the contents of /boot (ls -l /boot), there are no files. If I do a df -h, there is no available space yet it shows that it has a lot of used space. The fstab shows the following: # This file is edited by fstab-sync - see 'man fstab-sync' for details /dev/VolGroup00/LogVol00 / ext3 defaults 1 1 LABEL=/boot /boot ext3 defaults 1 2 none /dev/pts devpts gid=5,mode=620 0 0 none /dev/shm tmpfs defaults 0 0 none /proc proc defaults 0 0 none /sys sysfs defaults 0 0 /dev/VolGroup00/LogVol01 swap swap defaults 0 0 /dev/hda /media/cdrom auto pamconsole,exec,noauto,managed 0 0 # fschk.ext3 /boot gives this error: The superblock could not be read or does not describe a correct ext2 filesystem. If the device is valid and it really contains an ext2 filesystem (and not swap or ufs or something else), then the superblock is corrupt, and you might try running e2fsck with an alternate superblock: e2fsck -b 8193 <device> I am not sure what I should do next. Thank you in advance for any suggestions... Todd -- Ariste Software Petaluma, CA 94952 http://www.aristesoftware.com

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scanning under CentOS
by Boris Epstein 09 Mar '11

09 Mar '11

Hello listmates, I've got an HP Officejet 7110 All-in-One Printer which I am trying to get to scan for us. Details on the printer/scanner/FAX here: http://h10025.www1.hp.com/ewfrf/wc/product?cc=us&lc=en&dlc=en&product=91472 Now xsane seems to handle individual pages OK but multiplage scans through the ADF - that seems to be a complete mess. Hence the questions: 1) Is there a good scanner interface package that would allow me to just load the paper into the ADF, say "go" and watch the scanner go through the pages I've put in and produce an output file when it's done? 2) Has anyone worked with the scanner I am trying to use? What was your experience like when you did? Thanks. Boris.

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Security updates for CentOS-5
by Mark Foster 09 Mar '11

09 Mar '11

Hello, I was wondering why there haven't seemed to be any security updates for centos-5 since Jan 6. Per https://rhn.redhat.com/errata/rhel-server-errata.html there are a ton of outstanding issues. Thanks. -- Mark D. Foster <mark(a)foster.cc> http://mark.foster.cc/

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kernel vulnerabilities
by Riccardo Veraldi 09 Mar '11

09 Mar '11

Hello, I am using CentOS 5.5 I planned to update the kernel rpm because of vulnerabilities came out lately. The new redhat updated kernel would be 2.6.18-238.5.1.el5 Also Scientific Linux did and update to the kernels according to redhat advisories but I have seen that CentOS is still bound to kernel 2.6.18-194.32.1.el5 so no security update is available. I was wondering if this is normal or not. thank you Riccardo

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Re: [CentOS] Server hangs on CentOS 5.5
by Leen de Braal 09 Mar '11

09 Mar '11

> On Wed, Mar 9, 2011 at 10:24 AM, Leen de Braal <ldb(a)braha.nl> wrote: >>> m.roth(a)5-cent.us wrote: >>>> Michael Eager wrote: >>> >>>>> House-built, Gigabyte MB, AMD Phenom II X6, 6Gb RAM. >>>> >>>> Any chance the problem's with the video card? >>> >>> Video is on the MB. It doesn't seem likely that it's >>> the video, since the system doesn't respond to network >>> when it crashes. >>> >>> It could be anything. That's why I'm looking for >>> something that would give me a bit of a hint what >>> to look at. With an infrequent failure, it's not >>> practical to replace components piecemeal. >> >> While you open the case, check for the bulging capacitor problem. >> Will have the effect you describe, freezing up the system so that even >> bios routines don't work (your fans). >> If that's the case, replace mainboard. >> > > > Or replace the CAPS if you're not afraid of a soldering iron :) Very often resulting in a damaged board, because you damage the via's when pulling the caps. But it is worth a try. > > > > -- > Kind Regards > Rudi Ahlers > SoftDux > > Website: http://www.SoftDux.com > Technical Blog: http://Blog.SoftDux.com > Office: 087 805 9573 > Cell: 082 554 7532 > -- L. de Braal BraHa Systems NL - Terneuzen T +31 115 649333 F +31 115 649444

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/etc/hosts - hostname alias for 127.0.0.1
by Sean Carolan 09 Mar '11

09 Mar '11

Can anyone point out reasons why it might be a bad idea to put this sort of line in your /etc/hosts file, eg, pointing the FQDN at the loopback address? 127.0.0.1 hostname.domain.com hostname localhost localhost.localdomain

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connection speeds between nodes
by wessel van der aart 09 Mar '11

09 Mar '11

Hi All, I've been asked to setup a 3d renderfarm at our office , at the start it will contain about 8 nodes but it should be build at growth. now the setup i had in mind is as following: All the data is already stored on a StorNext SAN filesystem (quantum ) this should be mounted on a centos server trough fiber optics , which in its turn shares the FS over NFS to all the rendernodes (also centos). Now we've estimated that the average file send to each node will be about 90MB , so that's what i like the average connection to be, i know that gigabit ethernet should be able to that (testing with iperf confirms that) but testing the speed to already existing nfs shares gives me a 55MB max. as i'm not familiar with network shares performance tweaking is was wondering if anybody here did and could give me some info on this? Also i thought on giving all the nodes 2x1Gb-eth ports and putting those in a BOND, will do this any good or do i have to take a look a the nfs server side first? thanks, Wessel

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what is the “Online Certificate Status Protocol”
by erikmccaskey64 09 Mar '11

09 Mar '11

I use privoxy. In the user.action file i have a redirect rule and a few websites: { +redirect{s@http://@https://@} } .twitter.com .facebook.com Ok! it's working great, e.g.: if i visit any "*twitter.com" URL it gets redirected to HTTPS! But: with wireshark i can see some "OCSP" packets [ http://en.wikipedia.org/wiki/Online_Certificate_Status_Protocol ] Question: What are these packets? Why aren't there in HTTPS? Is my redirection method with privoxy is secure? Thank you for any tips/opinions!

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Re: [CentOS] Internet connection sharing?
by hadi motamedi 09 Mar '11

09 Mar '11

On 3/8/11, Rudi Ahlers <Rudi(a)softdux.com> wrote: > On Tue, Mar 8, 2011 at 12:09 PM, hadi motamedi <motamedi24(a)gmail.com> wrote: >> On 3/8/11, Jakub Jedelsky <jakub.jedelsky(a)gmail.com> wrote: >>> Dne 8.3.2011 10:19, hadi motamedi napsal(a): >>>> Dear All >>>> My centos machine is connected to my MS Windows machine on the net.The >>>> MS Windows machine is connected to Internet via valid IP address >>>> setting and on its secondary ip address setting it can see my centos >>>> machine on the intranet.Can you please let me know how can try for >>>> Internet connection sharing such that my centos machine can see >>>> internet with minor modifications done? >>>> Thank you in advance >>> >>> Hi hadi, >>> >>> this isn't centos thing, all you need is to configure network bridge on >>> your Windows machine. You didn't send info about your windows verison so >>> try to google something about it >>> (http://www.google.com/#q=windows+network+bridge) >>> >>> JJ >>> _______________________________________________ >>> CentOS mailing list >>> CentOS(a)centos.org >>> http://lists.centos.org/mailman/listinfo/centos >>> >> Thank you very much for your reply.I am familiar with internet >> connection sharing on MS Windows as I have a third XP client on the >> same net connected to the internet.I tried as the following on my >> centos: >> #route add -net default gw 172.18.209.1 >> Where this is the secondary ip address of the MS Windows host.But the >> centos cannot see the internet. Can you please let me know why? >> _______________________________________________ > > > Did you add any DNS resovler IP's to /etc/resolv.conf ? > > > -- > Kind Regards > Rudi Ahlers > SoftDux > > Website: http://www.SoftDux.com > Technical Blog: http://Blog.SoftDux.com > Office: 087 805 9573 > Cell: 082 554 7532 > Yes, I did but still internet unreachable.

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how to only allow tcp on dport 443 on the OUTPUT chain?
by erikmccaskey64 09 Mar '11

09 Mar '11

it's a normal desktop machines iptables firewall: If i want to block udp on dport 80 on the output chain, then is this enough? i want to only allow tcp on it! iptables -P OUTPUT DROP iptables -A OUTPUT -o $PUBIF --dport 80 -j ACCEPT or i need this rule? iptables -P OUTPUT DROP iptables -A OUTPUT -o $PUBIF -p tcp --dport 80 -j ACCEPT the second one is the good one?

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Re: [CentOS] Creating the symbolic links in the /boot and /boot/grub/
by Nico Kadel-Garcia 09 Mar '11

09 Mar '11

On Wed, Mar 9, 2011 at 12:40 AM, Todd Cary <todd(a)aristesoftware.com> wrote: > My current kernel is "vmlinuz-2.6.9-89.35.1" per grub.conf: > > #boot=/dev/hdc > default=1 > timeout=5 > splashimage=(hd0,0)/grub/splash.xpm.gz > hiddenmenu > title CentOS (2.6.9-100.EL) > root (hd0,0) > kernel /vmlinuz-2.6.9-100.EL ro root=/dev/VolGroup00/LogVol00 rhgb quiet > initrd /initrd-2.6.9-100.EL.img > title CentOS (2.6.9-89.35.1.ELsmp) > root (hd0,0) > kernel /vmlinuz-2.6.9-89.35.1.ELsmp ro root=/dev/VolGroup00/LogVol00 rhgb > quiet > initrd /initrd-2.6.9-89.35.1.ELsmp.img > > What is the correct syntax for "rpm -U -replacepkgs [kernel-whatever].rpm" ? > What should go into [kernel-whaetver]? > > In like manner, I have forgotten how to do a query on it to see if it is > present as in > > # rpm -q [kernel-name] > > Sorry, but it has been a long time since I used rpm and my Admin book does > not give an example. > > Todd OK, this should all go to the list for other CentOS folks who run into this kind of adventure. To get the full list of RPM's, look at the syntax of the "/etc/cron.daily/rpm"nightly script. > man rpm to look up the available options and learn about them. It's usually worth learning about such an important command, and RPM components are what yum really uses, so it's helpful to understand. > rpm -qa | grep kernel to get the list of kernel related components. Because of this line in your grub.conf: kernel /vmlinuz-2.6.9-100.EL I can also deduce that the relevant vmlinuz file was at /boot/bmlinuz-2.6.9-100.EL, and you can use the command "rpm -q -f /boot/vmlinuz-2.6.9-100.EL" to figure out what package it belonged to. > rpm -q -f /boot/vmlinuz-2.6.9-100.EL --qf '%{name}-%{version}-%{release}.%{arch}.rpm\n' will get you the get the full package name of the actual kernel RPM. Download the latest RPM from your favorite CentOS repository, after all, updating your kernel is you got into this trouble in the first place. > rpm -U --replacepkgs [whatever the name of that actual downloaded rpm is] See, you shouldn't *care* about your actual running kernel. You wanted the update, right? Go for it!!!! The running kernel will present problems you want the most recent one.

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Creating the symbolic links in the /boot and /boot/grub/
by Todd Cary 09 Mar '11

09 Mar '11

I started a new thread since the original one is getting rather long. I have retrieved the files I deleted in /boot and /boot/grub, however I need to make links for /boot/System.map (System.map -> System.map-2.6.9-89.35.1) /boot/vmlinuz (vmlinuz -> vmlinuz-2.6.9-89.35.1) /boot/grub/menu.lst (menu.lst -> ./grub.conf) If it was not so important to get it correct, I would appreciate the syntax for the command. Usually I would figure it out. Since I have restored the files (I will double check to make sure they are all there), do I need to run grub-install? My apologies for bothering everyone with such a dumb error on my part. Todd -- Ariste Software Petaluma, CA 94952 http://www.aristesoftware.com

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centos home router-gateway network setup
by Mark Pryor 09 Mar '11

09 Mar '11

Hello, In the last 3 days I setup my SOHO in 2 ways (1) attempt using a retail wifi/router by Netgear. The wifi is not part of this question. WAN (TW Cable modem) | | Netgear (192.168.1.1) \ \ _____\______________ | eth0 | | \ | | \--br0--eth2 | | | | | C5.5 eth1 | | / | |_______ /___________| / / LAN (switch upstairs) above is my first setup for SOHO network. Only br0 had an IP (dynamic). All of the nics had proto None and were slaved to br0. This is a very easy setup. The whole network, from Netgear to LAN and beyond, is one subnet. (2) attempt - permanently remove the Netgear and have C5.5 do all the services- gateway, router, dhcp, and firewall. The only way I could get this to work was with no bridging at all. Each nic needed an IP and all on different subnets. eth0: dynamic from TW WAN eth1: static at 192.168.1.1 eth2: static at 192.168.3.1 Using the lokkit firewall tool and adding NAT/Masquerade to eth0 this worked. My question is: is there a way avoid a wasted IP at eth2 and somehow bridge it to or with eth1 so only one subnet is possible inside the LAN? I know I need at least one static IP on one of the nics for the gateway. -- Mark

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Internet connection sharing?
by hadi motamedi 08 Mar '11

08 Mar '11

Dear All My centos machine is connected to my MS Windows machine on the net.The MS Windows machine is connected to Internet via valid IP address setting and on its secondary ip address setting it can see my centos machine on the intranet.Can you please let me know how can try for Internet connection sharing such that my centos machine can see internet with minor modifications done? Thank you in advance

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Load balancing...
by Todd 08 Mar '11

08 Mar '11

Hi All, Can anyone help me hash out how best to load balance a website that is getting considerable traffic? In the past I only have experience with BigIP where you have a load balancing device that keeps track and send traffic to the best server possible at the time. This was a proprietary system that I think was something Dell rebranded. Right now, the whole site is is 400gb of video, HTML5, Apache, PHP, MySQL, runs on a single box with 16gb of RAM and mirrored /var/www/html (2x1tb raid level drives). I have a Comcast 50/10 connection, 5 statics and I am seeing about 125 unique visitors a day. The site runs fine, but in anticipation of more traffic as well as a learning experience I would like to load balance. Obviously I need a second server just like the one it is running on now. I will probably spec something out that is capable of 32gb of RAM. What about a dedicated load balancing device? What specs should this be? How much RAM, HD, processor? It is sufficient to buy something with a GB NIC and say 4gb of RAM? Can one go slower but more RAM, small HD? I don't really quite know how intensive a task this decision making process is for the load balancer.. Right now, as example, I have an Untangle Firewall and it runs on a old AMD with 2gb RAM, GB NIC and it seems to do just fine. My local computer store has several P4 2.8ghz with 2GB of RAM for like $99.... Can anyone enlighten me on specs, proper setup, caveats....? -Jason

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Re: [CentOS] Internet connection sharing?
by David Brian Chait 08 Mar '11

08 Mar '11

> Do you have any proof of this? OR are you making assumptions of past > experiences? We have many Windows server on the net, directly with > very few hassles. I have never had a *NIX server under my charge hacked, I have had several Windows machines (those directly connected to the internet) hacked. No, I am not a *NIX worshiper either, I happen to have 7 MS certs. With that said, each OS has stregnths and weaknesses, MS tends to function better as a user facing interface to windows desktop infrastructure, but I avoid it like the plague for public facing infrastructure.

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Race condition with mdadm at bootup?
by Chuck Munro 08 Mar '11

08 Mar '11

Hello folks, I am experiencing a weird problem at bootup with large RAID-6 arrays. After Googling around (a lot) I find that others are having the same issues with CentOS/RHEL/Ubuntu/whatever. In my case it's Scientific Linux-6 which should behave the same way as CentOS-6. I had the same problem with the RHEL-6 evaluation version. I'm posting this question to the SL mailing list as well. For some reason, each time I boot the server a random number of RAID arrays will come up with the hot-spare missing. This occurs with hot-spare components only, never with the active components. Once in a while I'm lucky enough to have all components come up correctly when the system boots. Which hot spares fail to be configured is completely random. I have 12 2TB drives, each divided into 4 primary partitions, and configured as 8 partitionable MD arrays. All drives are partitioned exactly the same way. Each R6 array consists of 5 components (partitions) plus a hot-spare. The small RAID-1 host OS array never has a problem with its hot spare. The predominant theory via Google is that there's a race condition at boot time between full enumeration of all disk partitions and mdadm assembling the arrays. Does anyone know of a way to have mdadm delay its assembly until all partitions are enumerated? Even if it's simply to insert a several-second wait time, that would probably work. My knowledge of the internal workings of the boot process isn't good enough to know where to look. I tried to issue 'mdadm -A -s /dev/md/md_dXX' after booting, but all it does is complain about "No suitable drives found for /dev....." Here is the mdadm.conf file: ------------------------------------- MAILADDR root PROGRAM /root/bin/record_md_events.sh DEVICE partitions ##DEVICE /dev/sd* <<---- this didn't help. AUTO +imsm +1.x -all ## Host OS root arrays: ARRAY /dev/md0 metadata=1.0 num-devices=2 spares=1 UUID=75941adb:33e8fa6a:095a70fd:6fe72c69 ARRAY /dev/md1 metadata=1.1 num-devices=2 spares=1 UUID=7a96d82d:bd6480a2:7433f1c2:947b84e9 ARRAY /dev/md2 metadata=1.1 num-devices=2 spares=1 UUID=ffc6070d:e57a675e:a1624e53:b88479d0 ## Partitionable arrays on LSI controller: ARRAY /dev/md/md_d10 metadata=1.2 num-devices=5 spares=1 UUID=135f0072:90551266:5d9a126a:011e3471 ARRAY /dev/md/md_d11 metadata=1.2 num-devices=5 spares=1 UUID=59e05755:5b3ec51e:e3002cfd:f0720c38 ARRAY /dev/md/md_d12 metadata=1.2 num-devices=5 spares=1 UUID=7916eb13:cd5063ba:a1404cd7:3b65a438 ARRAY /dev/md/md_d13 metadata=1.2 num-devices=5 spares=1 UUID=9a767e04:e4e56a9d:c369d25c:9d333760 ## Partitionable arrays on Tempo controllers: ARRAY /dev/md/md_d20 metadata=1.2 num-devices=5 spares=1 UUID=1d5a3c32:eb9374ac:eff41754:f8a176c1 ARRAY /dev/md/md_d21 metadata=1.2 num-devices=5 spares=1 UUID=38ffe8c9:f3922db9:60bb1522:80fea016 ARRAY /dev/md/md_d22 metadata=1.2 num-devices=5 spares=1 UUID=ebb4ea67:b31b2105:498d81af:9b4f45d3 ARRAY /dev/md/md_d23 metadata=1.2 num-devices=5 spares=1 UUID=da07407f:deeb8906:7a70ae82:6b1d8c4a ------------------------------------- Your suggestions are most welcome ... thanks. Chuck

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Re: [CentOS] CentOS and Marvell SAS/SATA drivers
by Chuck Munro 08 Mar '11

08 Mar '11

On 03/07/2011 09:00 AM, Nico Kadel-Garcia wrote: > > On Sun, Mar 6, 2011 at 10:07 PM, Charles Polisher<cpolish(a)surewest.net> wrote: > >> > https://secure.wikimedia.org/wikipedia/en/wiki/Fakeraid#Firmware.2Fdriver-b… >> > covers fake RAID. > Ouch. That was*precisely* why I used the 2410, not the 1420, SATA > card, some years back. It was nominally more expensive but well worth > the reliability and support, which was very good for RHEL and CentOS. > > I hadn't been thinking about that HostRaid messiness because I read > the reviews and avoided it early. > Here's the latest info which I'll share ... it's good news, thankfully. The problem with terrible performance on the LSI controller was traced to a flaky disk. It turns out that if you examine 'dmesg' carefully you'll find a mapping of the controller's PHY to the "id X" string (thanks to an IT friend for that tip). The LSI error messages have dropped from several thousand/day to maybe 4 or 5/day when stressed. Now the LSI controller is busy re-syncing the arrays with speed consistently over 100,000K/sec, which is excellent. My scepticism regarding SMART data continues ... the flaky drive showed no errors, and a full test and full zero-write using the WD diagnostics revealed no errors either. If the drive is bad, there's no evidence that would cause WD to issue an RMA. Regarding "fake raid" controllers, I use them in several small machines, but only as JBOD with software RAID. I haven't used Adaptec cards for many years, mostly because their SCSI controllers back in the early days were junk. Using RAID for protecting the root/boot drives requires one bit of extra work ... make sure you install grub in the boot sector of at least two drives so you can boot from an alternate if necessary. CentOS/SL/RHEL doesn't do that for you, it only puts grub in the boot sector of the first drive in an array. Chuck

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CentOS 5.x 32bit VPS Ping Issue
by Matt 08 Mar '11

08 Mar '11

I just got an inexpensive VPS too have an outside server to play/test with. I am pinging it every 5 minutes and graphing with MRTG on another CentOS box. This works fine to all servers but the VPS. The first ping to the VPS is always crud and following ones are fine. [root@ns1 scripts]# ping X PING X 56(84) bytes of data. 64 bytes from X: icmp_seq=1 ttl=55 time=773 ms 64 bytes from X: icmp_seq=2 ttl=55 time=42.4 ms 64 bytes from X: icmp_seq=3 ttl=55 time=42.8 ms 64 bytes from X: icmp_seq=4 ttl=55 time=43.1 ms Makes my graph for that one look real bad because it looks at first ping only. Thought about modifying my script to send a warm up ping first but I just don't think I should have to do that or is this a normal thing for a VPS that is pretty much idle?

3 2

what wrong about my ipv6 address
by ann kok 08 Mar '11

08 Mar '11

Hi I used the command "ip -6 addr add 2001:DB8:CAFE:1111::12/64 dev eth0" to add ipv6 address and can see it in ifconfig but can't ping it Why? Thank you # ping6 2001:db8:cafe:1111::12 PING 2001:db8:cafe:1111::12(2001:db8:cafe:1111::12) 56 data bytes >From ::1 icmp_seq=1 Destination unreachable: Address unreachable >From ::1 icmp_seq=2 Destination unreachable: Address unreachable >From ::1 icmp_seq=3 Destination unreachable: Address unreachable >From ::1 icmp_seq=5 Destination unreachable: Address unreachable >From ::1 icmp_seq=6 Destination unreachable: Address unreachable >From ::1 icmp_seq=7 Destination unreachable: Address unreachable >From ::1 icmp_seq=9 Destination unreachable: Address unreachable >From ::1 icmp_seq=10 Destination unreachable: Address unreachable >From ::1 icmp_seq=11 Destination unreachable: Address unreachable

3 3

Enscript
by Hal Davison 08 Mar '11

08 Mar '11

Greetings.. Yes ENSCRIPT is a text to PostScript conversion service. As usual, am a bi confused on how to implement the fit-to-page functionality. Google resources say it is used then proceeds to dance around the issue Using the -f<fontname>@W/H option can one calculate the necessary dimensions for the print job consisting of over 200 pages? --Hal. -- Hal Davison Observe Goal, Set the course, Burn the map Davison Consulting This correspondence was composed using Dragon Speaking Version 10 Peg#: 2007011701

2 1

BUG: soft lockup CPU stuck for 10seconds (Server went down)
by Roland RoLaNd 08 Mar '11

08 Mar '11

Hello, Today my server stopped responding. i went to the console and on the screen there were a continuous loop of the following info shown on the screen: BUG: soft lockup - CPU#0 stuck for 10s! [java:13959] and alot of other information. ii've took a screen shot of the info shown , you can find it under the following url: http://img585.imageshack.us/i/img00012201103070833.jpg/ and had to hard reset for it to be back up and running. i tried googling with no luck for direct relevant info. so hoping you can help out Thanks, --Roland

6 8

email to web posting software?
by Dave Stevens 07 Mar '11

07 Mar '11

Dear CentOS, I have a user group that would like to be able to routinely post (easily) emails to a web site. Must be usable without special training. I have no experience with this. Anyone have a suggestion? LAMP stack installed. Dave -- When a respected information source covers something where you have on-the- ground experience, the result is often to make you wonder how much fecal matter you've swallowed in areas outside your own expertise. -- Rusty Russell

4 4

Centos 6
by JD 07 Mar '11

07 Mar '11

Any word on approximate release date of Centos 6? Cheers, JD

49 96

OT: grep regex pointer appreciated
by Patrick Lists 07 Mar '11

07 Mar '11

Hi, My grep regex foo is not very good and googling is getting me nowhere so hopefully someone is kind enough to give me some pointers. Goal: grep (non .dbg) filenames and versions from a ftp dir listing and a raw html file: $ wget --no-remove-listing -O ftp-index.txt ftp://127.0.0.1/test/ $ wget --no-remove-listing -O index.html http://127.0.0.1/test/ The relevant parts of the files above (first one is ftp listing, second part is the html file, both copied to test_regex.txt) are: 2011 Jan 28 21:25 File <a href="ftp://127.0.0.1/bar-4.5.6.i686.dbg.tgz">bar-4.5.6.i686.dbg.tgz</a> (5551274 bytes) 2011 Jan 28 21:25 File <a href="ftp://127.0.0.1/bar-4.5.6.i686.tgz">bar-4.5.6.i686.tgz</a> (5551274 bytes) 2011 Jan 28 21:25 File <a href="ftp://127.0.0.1/bar-4.5.6.x86_64.dbg.tgz">bar-4.5.6.x86_64.dbg.tgz</a> (5551274 bytes) 2011 Jan 28 21:25 File <a href="ftp://127.0.0.1/bar-4.5.6.x86_64.tgz">bar-4.5.6.x86_64.tgz</a> (5551274 bytes) <tr><td><a href="foo-bar-1.2.3+1.2.3.tar.gz">foo-bar-1.2.3+1.2.3.tar.gz</td></tr> This is what I now have (improvements most welcome): $ egrep -o ">([A-Za-z_-]+)([[:digit:]]{1,3}(\.[[:digit:]]{1,3})*).+(.|t)gz" ./test_regex.txt | grep -v ".dbg" | tr -d '>' Output: foo-bar-1.2.3+1.2.3.tar.gz baz-4.5.6.i686.tgz baz-4.5.6.x86_64.tgz So far so good but now I also want to get the version numbers which I can't figure out. Anyone have a pointer how to get the version number from these filenames (1.2.3+1.2.3 and 4.5.6)? Thanks! Patrick

4 4

IPERF Server
by Matt 07 Mar '11

07 Mar '11

When starting IPERF with "iperf -s" or "iperf -sD" it seems to stop after client runs its first test. I would like to leave it running for a few hours to give someone a chance to run a few tests. Is there a way to leave it active on the server and kill it manually later?

2 1

Re: [CentOS] IP6 Anyone?
by sheraznaz＠yahoo.com 07 Mar '11

07 Mar '11

>> Always learning wrote: >> I always thought, mistakenly, IP6 was 6 segments, because it was IP6. IP4 had 4 segments. However IP6 is >actually IP version 6 and it has 8 segments. I don't think I ever heard IP6, but always IPv6. Counting segments might not be as meaningful. IPv6 has twice (8) segments compared to IPv4 however each segment is 2 octets making IPv6 address space 4 times (128 bits) compared to IPv4 (32 bits). Thanks Sheraz Sent from my Verizon Wireless BlackBerry

9 15

Re: [CentOS] CentOS and Marvell SAS/SATA drivers
by Chuck Munro 07 Mar '11

07 Mar '11

On 03/06/2011 09:00 AM, compdoc wrote: > >> >Regarding the Marvell drivers, I had good luck with the 'sata_mv' driver >> >in Scientific Linux 6 just yesterday, running a pair of 4-port PCIe-x4 >> >Tempo 'Sonnet' controller cards. > Are those the Mac/Windows Sonnet cards that go for less than $200? > > What kind of performance you seeing? Are you doing software raid on them? Yes, those are the cards which target Windows and OS-X, but they work fine on Linux as well. They use the Marvell 88SX series chips. They control 6 2TB WD Caviar Black drives, arranged as 5 drives in a RAID-6 array with one hot spare. 3 drives are connected to each of two cards. mdstat shows array re-sync speed is usually over 100 MBytes/sec although that tends to vary quite a bit over time. > ------------------------------ > On 03/06/2011 09:00 AM, John R Pierce wrote: > > On 03/05/11 7:01 AM, Eero Volotinen wrote: >> > >> > areca works.. >> > >> > > for SAS, I prefer LSI Logic. The Supermicro mobo I'm using (X8DAL-3) has an on-board LSI 1068E SAS/SATA controller chip, although I have the RAID functionality disabled so I can use it as a bunch of drives for software RAID-6. Like the Tempo cards, it has 6 2TB WD SATA drives attached which provides a second set of arrays. Performance really sucks, for some unknown reason, and I get lots of I/O error messages logged when the drives get busy. There appears to be no data corruption, just a lot of retries that slow things down significantly. The LSI web site has no info about the errors. The firmware is passing back I/O abort code 0403 and LSI Debug info related to "channel 0 id 9". There are only 8 ports so I don't know which disk drive may or may not be causing problems. The SMART data on all disks shows no issues, although I tend to treat some SMART data with scepticism. I need to track this error down because my understanding is that the LSI controller chip has very good performance. Chuck

3 3

kernel NETDEV WATCHDOG: eth0: transmit timed out
by sync 07 Mar '11

07 Mar '11

Hi , all : Sometimes my server network connection on Linux goes down with short message in syslog saying: "[localhost kernel] NETDEV WATCHDOG: eth0: transmit timed out" (or similar). By the way , I installed the CentOS 5.4 x86_64 bit and the kernel version was 2.6.18-164. Has anyone experienced this problem or is it the bug of the kernel ? I restart the network and that problem have resolved just now.

5 5

Gnu Screen - terminal issues
by Sean Carolan 07 Mar '11

07 Mar '11

I really like gnu screen and use it everyday but there's one thing that is a bit inconvenient, and that's the odd line wrapping and terminal size issues that seem to pop up. The problem crops up when I type or paste a really long command, and then go back and try to edit it; the text starts to wrap over itself and you have no idea what you are editing. Any fixes for this?

9 33

Updating hardware clock from cron
by Kenneth Porter 06 Mar '11

06 Mar '11

Is there a package to do this? Normally the hardware clock is set during shutdown if one is running ntpd. But if a long-running server shuts down unexpectedly, this isn't done, and the hardware clock might be off by a lot when it comes back up. So setting it periodically from a cron job could be useful. What do others do? Adding a one liner to /etc/cron.daily that invokes /etc/rc.d/init.d/ntpd would do it but it seems heavyweight to restart ntpd. Alas, the script doesn't export just the sync_hwclock function.

5 5

Problem burning dvd's
by Jimmy Bradley 06 Mar '11

06 Mar '11

I have a question on burning dvd iso's, using k3b. I have a sony dvd rw, and I've burned cd's with now problem, including iso's. The problem I'm having is, when I burn a dvd iso, k3b says it's a success, but then when I re-insert the disk, the drive tries to read the disk, but the read/write light just stays on, and the drive can't access the disk. Am I leaving a step out, or something? I burn cd iso's all the time. Thanks Jim

1 0

[Fwd: Re: Centos 6 - What are you looking forward to?]
by James B. Byrne 05 Mar '11

05 Mar '11

On Fri, March 4, 2011 14:12, aurfalien(a)gmail.com wrote: > On Mar 4, 2011, at 11:07 AM, Kenneth Porter wrote: > >> --On Thursday, March 03, 2011 10:11 AM -0500 Digimer >> <linux(a)alteeve.com >> > >> wrote: >> >>> How about the rest of you? What are you looking forward to in >>> CentOS 6 when it is released? >> >> A new Ruby > > +1 I solved this problem on my 5.5 servers in the following manner: login: not_as_root_user . . . $ # Add rpmforge repos to yum per: $ # http://wiki.centos.org/AdditionalResources/Repositories/RPMForge $ sudo yum install checkinstall $ wget ftp://ftp.ruby-lang.org/pub/ruby/ruby-1.8.7-p334.tar.gz $ # to get latest or most desired source change version as required $ tar -xzf ruby-1.8.7-p334.tar.gz $ # expand source archives in /tmp $ cd ruby-1.8.7-p334 $ # change to source directory $ ./configure $ # configure makefile for this host $ make $ # build the Ruby VM $ checkinstall $ # package ruby VM and suppport files as an RPM package $ sudo yum localinstall \ /usr/src/redhat/RPMS/i386/ruby-1.8.7-p334-1.i386.rpm \ --nogpgcheck $ # install the rpm package from the checkinstall location -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3 -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

1 0

Will CentOS become obsolete now because of the changes Red Hat is implementing?
by Rudi Ahlers 05 Mar '11

05 Mar '11

This post appeared on another forum: Will CentOS become obsolete now because of the changes Red Hat is implementing? Red Hat has changed the way it distributes Enterprise Linux kernel code in an effort to prevent Oracle and Novell from stealing its customers, making it more difficult for these competitors to understand which patches have been applied where. Some have speculated that the change is designed to make it harder for Oracle as well as the open source CentOS project to build their own Linux distributions. But Stevens says this is not the case. He says the change is meant to hamper Oracle and Novell's ability to offer support to customers who are already running Red Hat Enterprise Linux (RHEL). "We made the change, quite honestly, because we are absolutely making a set of steps that make it more difficult for competitors that wish to provide support services on top of Red Hat Enterprise Linux," Red Hat chief technology officer Brian Stevens tells The Register, before naming those competitors. "Today, there are two competitors that I'm aware of that go to our customers directly, offering to support RHEL directly for them...Oracle and Novell." In essence, Red Hat is trying to hide information from these competitors that is essential to providing support for RHEL specifically. "What we're trying to impede is competitors that come to customers who are already running RHEL under subscription from Red Hat and saying 'Don't pay Red Hat anymore, pay us, and don't make any changes to your systems'," Stevens says. He insists that the change does not violate either the letter or the spirit of RHEL's GPL open source license. "We were very careful that what we've done does not impede what our customers need to accomplish or what the community needs to accomplish." And he says that the change would not really hamper the development of other Linux distros, including CentOS. "We haven't at all restricted CentOS's ability to grab source code and recompile it and clean-out trademarks and package it. It's just some of the knowledge of the insides that we're hiding," he explains. One longtime CentOS developer agrees. "I'll not lose sleep on the matter," CentOS co-founder Russ Herold tells The Reg. In November, with the release of Red Hat Enterprise Linux 6, the company released its kernel package with all patches pre-applied. "In the past, we distributed the kernel as a base file and then a set of add-on patches that accompany it. Then when you did a build, the build process automatically applied all those patches to the kernel file," Stevens says. "Now, we integrate those patch files directly into that kernel. We do the first part of the build process prior to distribution." This was recently noticed by kernel-community member and LWN editor Jonathan Corbet, who took issue with the change, calling Red Hat's package "obfuscated" kernel source code. "Distribution in this form should satisfy the GPL, but it makes life hard for anybody else wanting to see what has been done with this kernel," Corbet wrote. "Hopefully it is simply a mistake which will be corrected soon." Others speculated that the move would undermine not only Oracle's Unbreakable Linux, but also CentOS. Both are based on RHEL. CentOS is meant to be a RHEL clone. Whereas the compiled bits of Red Hat Enterprise Linux are only available under a Red Hat paid subscription, CentOS is completely free. "The changes will make work harder for distributions such as CentOS, the community-built Linux distribution ... based on Red Hat's sources," H Online said. "CentOS is built from the RHEL source by a limited number of volunteers and Red Hat's change in policy will mean more work for them unless more volunteers or other companies step in and provide them with assistance." We heard similar noises from an experienced Linux kernel developer. He said that Red Hat's change was like shuffling all the cards in an old fashioned Dewey Decimal library file system – the card you want is still there, but finding it is no easy task – and that this would cause problems for CentOS, which is an economic threat to Red Hat. But CentOS founder Russ Herold insists the change is not a big issue. "Private local trial builds of the released RHEL 6 sources by me and others have proceeded with no major problems. I just do not see that the changes as some earth-shattering change. I just think [the patches will be] incrementally more difficult to figure out," he says. "Nothing in Red Hat's new approach prevents a person from running a local version-control system, containing the pristine kernel at point A, and the Red Hat variant which we might call point B. Then one runs a 'diff' in that version-control system between A and B, and starts reading the diffs to see what is happening. Over time, both the pristine kernel, and the patched Red Hat versions will vary, and one will get a sense for which 'diff' parts matter, and which are cosmetic cleanups." Other distros will not be affected, Red Hat's Stevens says, because the company distributes its kernel changes upstream as well. "The work that we've done should not impede companies from building their own versions of Linux and supporting those for their customers," he says. "All the code we deliver through RHEL is out there. In most cases, the changes that go into RHEL. We already distribute into the upstream kernel. We have an upstream-first policy, where we're developing openly and then later integrating into our tree and then delivering it. So it shouldn't at all impede the community or anybody that's in the business of competing on that." Red Hat, he reiterates, is trying to keep RHEL-specific knowledge away from Oracle and Novell. With past RHEL kernel-code distributions, the patches mapped to articles in Red Hat's knowledge base. "It makes competitors do heavy lifting," he says. "If you want to support RHEL, remove the trademarks, and do some heavy lifting. If nothing else, it causes competitors to have to invest." This won't hamper CentOS, he says, because CentOS isn't in the support business. "The code is still available. It's just more difficult to support the distro as a commercial entity. CentOS is not in the support business." Oracle and Novell are in the support business. And whatever collateral damage was caused by Red Hat's change in policy, one thing is for sure. On some level, it will indeed be more difficult for Oracle and Novell to pilfer the company's customers. Full story here : http://www.channelregister.co.uk/201...ode_packaging/ Can any of the CentOS team please comment on this? P.S. I don't want to put extra pressure on you guys seeing as the recent conversations about Centos 5.6 & CentOS 6 have done enough damage already, but it would be interesting to know what the future of CentOS is like with RedHat's change -- Kind Regards Rudi Ahlers SoftDux Website: http://www.SoftDux.com Technical Blog: http://Blog.SoftDux.com Office: 087 805 9573 Cell: 082 554 7532

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Re: [CentOS] CentOS and Marvell SAS/SATA drivers
by Chuck Munro 05 Mar '11

05 Mar '11

On 03/04/2011 09:00 AM, Les Mikesell wrote: > > On 3/3/11 6:52 PM, Chuck Munro wrote: >> > >> > I've been on a real roller coaster ride getting a large virtual host up >> > and running. One troublesome thing I've discovered (the hard way) is >> > that the drivers for Marvell SAS/SATA chips still have a few problems. >> > >> > After Googling around quite a bit, I see a significant number of others >> > have had similar issues, especially evident in the Ubuntu forums but >> > also for a few RHEL/CentOS users. >> > >> > I have found that under heavy load (in my case, simply doing the initial >> > sync of large RAID-6 arrays) the current 0.8 driver can wander off into >> > the weeds after a while, less so for the older 0.5 driver in CentOS-5. >> > It would appear that some sort of bug has been introduced into the newer >> > driver. >> > >> > I've had to replace the Marvell-based controllers with LSI, which seem >> > rock solid. I'm rather disappointed that I've wasted good money on >> > several Marvell-based controller cards (2 SAS/SATA and 2 SATA). > > I replaced separate SII and promise controllers with a single 8-port Marvell > based card and thought it was a big improvement. No problems with centos5.x, > mostly running RAID1 pairs, one of which is frequently hot-swapped and > re-synced. I hope its not going to have problems when I upgrade. > Since I have the luxury of time to evaluate options, I've just downloaded Scientific Linux 6 to see what happens with either the mvsas or sata-mv driver. This is my first experience with SL but I wanted native ext4 rather than the preview version in CentOS-Plus. Even if I stick with SL-6 as the KVM host, I'll continue using CentOS as guest machines. If the Marvell drivers don't pan out, it looks like I'll have to either spend money on a 3Ware|LSI|Promise controller or revert to CentOS-Plus 5.5 for ext4. SL-6 is installing as I write this. Chuck

5 4

Re: [CentOS] CentOS and Marvell SAS/SATA drivers
by Chuck Munro 05 Mar '11

05 Mar '11

On 03/05/2011 09:00 AM, Nico Kadel-Garcia wrote: > > On Fri, Mar 4, 2011 at 4:16 PM, compdoc<compdoc(a)hotrodpc.com> wrote: >>> >>If the Marvell drivers don't pan out, it looks like I'll have >>> >>to either spend money on a 3Ware|LSI|Promise controller >> > >> > The 3ware are excellent... > And Promise, historically, is*not*. > > Yes, I've had problems with Promise cards in the past, but haven't bought any for a long time. They seem to be moving upscale these days. Regarding the Marvell drivers, I had good luck with the 'sata_mv' driver in Scientific Linux 6 just yesterday, running a pair of 4-port PCIe-x4 Tempo 'Sonnet' controller cards. So it appears someone has fixed that particular driver. I've decided to stick with those cards rather than re-install the Supermicro/Marvell SAS/SATA 8-port controllers, which use the 'mvsas' driver that I had problems with on the RHEL-6 evaluation distro. So far, SL-6 has performed very well, all RAID-6 arrays re-synced properly, and running concurrent forced fscks on eight arrays was very fast (because the ext4 filesystems were still empty :-) ). I think I'll stick with SL-6 as the VM host OS, but will use CentOS for the guest VMs. CentOS-5.x will do fine for now, and I'll have the luxury of upgrading guest OSs to CentOS-6 as the opportunity arises. Chuck

2 1

bind 9.7.3 and libp11 engine_pkcs11 of fedoca core 14
by fakessh ＠ 05 Mar '11

05 Mar '11

hello list centos. I installed the packages libp11 and engine_pkcs11 of fedora core 14 on my centos 5.5 to allow me to compile the latest version of bind. this is the only way I found to compile bind 9.7.3. you know another way to compile bind 9.7.3 on centos 5.5 thanks for all your return -- gpg --keyserver pgp.mit.edu --recv-key 092164A7 http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x092164A7

3 3

Re: [CentOS] Gnu Screen - terminal issues
by Nico Kadel-Garcia 05 Mar '11

05 Mar '11

On Sat, Mar 5, 2011 at 12:50 AM, Larry Vaden <vaden(a)texoma.net> wrote: > On Fri, Mar 4, 2011 at 6:46 PM, Nico Kadel-Garcia <nkadel(a)gmail.com> wrote: >> >> It's default behavior for the Nomachine Windows client. When you close >> it, it asks if you want to "disconnect" or "terminate" the session. >> Whether it works well is heavily dependent on the server, whether >> Neatx, FreeNX, or the NoMachine server. > > Please extend your remarks about which server you think is best and why. > > thanks/ldv Larry, please check the archives. I already covered that.

1 0

Re: [CentOS] HOW to REDIRECT to HTTPS?
by Kai Schaetzl 05 Mar '11

05 Mar '11

Ralph Angenendt wrote on Thu, 3 Mar 2011 16:26:29 +0100: > Hope I remember it this evening. No real access to the CentOS mail stuff > from here :) Hi Ralph, wollte nochmal an das unsubscribe erinnern. Es ist: from: erikmccaskey64 <erikmccaskey64(a)zoho.com> Schöne Grüße, Kai

1 0

IPTABLES rule for separating users
by erikmccaskey64 05 Mar '11

05 Mar '11

I have an OpenWrt 10.03 router [ IP: 192.168.1.1 ], and it has a DHCP server pool: 192.168.1.0/24 - clients are using it through wireless/wired connection. Ok! Here's the catch: I need to separate the users from each other. How i need to do it: by IPTABLES rule [ /etc/firewall.user ]. Ok! "Loud thinking": So i need a rule something like this [on the OpenWrt router]: - DROP where SOURCE: 192.168.1.2-192.168.1.255 and DESTINATION is 192.168.1.2-192.168.1.255 The idea is this. Ok! Questions! - Will i lock out myself if i apply this firewall rule? - Is this a secure method? [ is it easy to do this?: hello, i'm a client, and i say, my IP address is 192.168.1.1! - now it can sniff the unencrypted traffic! :( - because all the clients are in the same subnet! ] - Are there any good methods to find/audit for duplicated IP addresses? - Are the any good methods to find/audit for duplicated MAC addresses? - Are there any good methods to do this IPTALBES rule on Layer2?: `$ wget -q "http://downloads.openwrt.org/backfire/10.03/ar71xx/packages/" -O - | grep -i ebtables` `$ ` p.s.: The rule would be [is it on a good chain?]: iptables -A FORWARD -m iprange --src-range 192.168.1.2-192.168.1.255 --dst-range 192.168.1.2-192.168.1.255 -j DROP Thank you!

3 2

KVM Question
by William Warren 05 Mar '11

05 Mar '11

I'm curious exactly how KVM works. If i see things right it's virtualization that's still within a full base operating system load correct? How does KVM perform against VMware which uses a much smaller footprint? Is KVM really a hypervisor? I'm just trying figure out the basics of KVM..:) Thanks, William Warren

2 1

Re: [CentOS] Updating hardware clock from cron
by Matt 04 Mar '11

04 Mar '11

> Is there a package to do this? > > Normally the hardware clock is set during shutdown if one is running ntpd. > But if a long-running server shuts down unexpectedly, this isn't done, and > the hardware clock might be off by a lot when it comes back up. So setting > it periodically from a cron job could be useful. > > What do others do? Adding a one liner to /etc/cron.daily that invokes > /etc/rc.d/init.d/ntpd would do it but it seems heavyweight to restart ntpd. > Alas, the script doesn't export just the sync_hwclock function. I add this to /etc/rc.local /usr/sbin/ntpdate us.pool.ntp.org Sets the clock on start up. Might run it by cron once a month or so too.

6 8

top and allocation issues
by Michael D. Berger 04 Mar '11

04 Mar '11

In a context where exceptions are caught, I ran the fragment: cerr << "allocating" << endl; char* arr[100]; for (int jj = 0; jj < 10; ++jj) { cerr << "jj = " << jj << endl; arr[jj] = new char[2000000000]; sleep (30); } sleep (10); for (int jj = 0; jj < 10; ++jj) delete[] arr[jj]; cerr << "deleted" << endl; The exception was caught with jj = 1, i.e., on the second allocation. But on top, I see: top - 14:08:46 up 5:21, 10 users, load average: 0.04, 0.06, 0.08 Tasks: 158 total, 1 running, 157 sleeping, 0 stopped, 0 zombie Cpu(s): 2.7%us, 2.0%sy, 0.0%ni, 94.5%id, 0.6%wa, 0.1%hi, 0.1%si, 0.0%st Mem: 1941908k total, 1231804k used, 710104k free, 138372k buffers Swap: 3899384k total, 0k used, 3899384k free, 876020k cached and the "710104k free" suggests that I should have failed on the first allocation. Furthermore, the allocation did not alter the values in top (except for a little jitter). Wherein do I err? [~]$ uname -a Linux xxxxx 2.6.18-194.32.1.el5 #1 SMP Wed Jan 5 17:53:09 EST 2011 i686 i686 i386 GNU/Linux Thanks, Mike.

6 12

virtualization on the desktop a myth, or a reality?
by Rudi Ahlers 04 Mar '11

04 Mar '11

I am busy setting up some XEN servers on a SAN for high availability and Cloud Computing, and thought it could be cool to setup virtualization on a CentOS 5.5 Desktop, running on a Core i3 + 4GB RAM, and use the SAN's storage to see if it could actually be worth my while to replicate a Cloud Computing setup in the office. And, cause I got a bit bored waiting for a few RAID-sets to finish initializing. So, I installed CentOS + KDE, chose the Virtualization package and used Virtual Machine Manager to setup another CentOS VM inside CentOS (I only have a CentOS ISO on this SAN, since we don't use Debian / Slackware / FC / Ubuntu / etc). The installation was probably about the same speed as it would be on raw hardware. But, using the interface is painfully slow. I opened up Firefox and browsed the web a bit. The mouse cursor lagged a bit and whenever I loaded a slow / large website, it seemed asif the whole VM lagged behind. The Virtual Machine didn't use much resources. I allocated 1CPU core & 512MB RAM to it Yes, I know that I could have used KVM, VMWare or VirtualBox, but I wanted to use what's included already. Cause, let's face it, many people (even though they're technically advanced users) don't know virtualization. And, granted, when we install Virtual Machines on a XEN server, we don't ever use X since the servers we run as web / email / database / file servers, so there's no need for X. BUT, I want(ed) to see if this is a reality for the average desktop user, or not really (yet?) seeing as most modern PC's have far more CPU & RAM resources than what is actually needed by most. I'm not talking about developers / graphic designers / etc. I'm talking about Bob, who uses his PC for email, internet, document writing, etc and needs to boot into Windows if he feels like playing Warcraft III or StarCraft II, or use Pastel, etc. Wouldn't it be nice to run Windows, of for that matter Solaris / FreeBSD / MAC (graphics designer) / another flavor of Linux / etc inside your favorite Linux, and access it from the Desktop without too much trouble? -- Kind Regards Rudi Ahlers SoftDux Website: http://www.SoftDux.com Technical Blog: http://Blog.SoftDux.com Office: 087 805 9573 Cell: 082 554 7532

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Xen stack scheme
by Jussi Hirvi 04 Mar '11

04 Mar '11

I need to restructure my server farm from tower PC:s to a minimal amount of 1U rack servers. I am going to rely on xen virtualization, as KVM seems not to be very mature yet. My current problem is the mail server, which uses a lot of CPU and I/O. A dedicated machine would be the best option. But would there be any sense in this: - run the mail server in xen dom0 (to get full native performance) - append a couple of light-weight servers as domU:s (like name server) - Jussi Hirvi -- Jussi Hirvi * Green Spot Topeliuksenkatu 15 C * 00250 Helsinki * Finland Tel. +358 9 493 981 * Mobile +358 40 771 2098 (only sms) jussi.hirvi(a)greenspot.fi * http://www.greenspot.fi

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CentOS-announce Digest, Vol 73, Issue 2
by centos-announce-request＠centos.org 04 Mar '11

04 Mar '11

Send CentOS-announce mailing list submissions to centos-announce(a)centos.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.centos.org/mailman/listinfo/centos-announce or, via email, send a message with subject or body 'help' to centos-announce-request(a)centos.org You can reach the person managing the list at centos-announce-owner(a)centos.org When replying, please edit your Subject line so it is more specific than "Re: Contents of CentOS-announce digest..." Today's Topics: 1. CESA-2011:0219 Low CentOS 4 i386 and x86_64 EOL Notice (Johnny Hughes) ---------------------------------------------------------------------- Message: 1 Date: Thu, 03 Mar 2011 19:53:46 -0600 From: Johnny Hughes <johnny(a)centos.org> Subject: [CentOS-announce] CESA-2011:0219 Low CentOS 4 i386 and x86_64 EOL Notice To: CentOS-Announce <centos-announce(a)centos.org> Message-ID: <4D70462A.9060308(a)centos.org> Content-Type: text/plain; charset="iso-8859-1" CentOS Errata and Security Advisory CESA-2011:0219 This is the 1 year notification for the End of Life for the CentOS 4 distribution. The upstream provider will discontinue public updates of their EL4 product on February 29th, 2012. The CentOS Project will end support for CentOS 4 on the same date. CentOS 4, as well as all previously released versions of CentOS, will continue to be available in the Centos Vault: http://vault.centos.org/ This CESA includes a new centos-release file that reminds you of the February 29th, 2012 end of life date. Users still running production workloads on CentOS 4 are advised to begin planning the upgrade to CentOS 5 or (when available) CentOS 6 before the EOL date. For users who are unable to migrate off the EL 4 code base before its end-of-life date, the upstream provider intends to offer a limited, optional extension program. The CentOS Project recommends that you contact their sales team for a price quote for their extended service if you can not move to a newer code base before February 29th, 2012. x86_64: centos-release-4-9.1.x86_64.rpm i386: centos-release-4-9.1.i386.rpm src: centos-release-4-9.1.src.rpm

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