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xen network io load
by Tadeas Mengler 16 Jul '07

16 Jul '07

Hello I have Xen related issues. I try to describe it as best as I can. While transmitting large amounts of data from domU the IO load increases greatly, thus making the domU unusable. The load is significant even on dom0. The performance of cpus and hard drives is not an issue. We have this problem on all servers with diferent hw configurations. Please do you know the reason of this behaviour, do you have any experience whith such problems? -- S pozdravem Tadeas Mengler Senior Linux System Administrator tadeas.mengler(a)miton.cz 483 367 866, 608 264 866 MITON CZ, s.r.o. | www.miton.cz Jiraskova 9, 466 01 Jablonec nad Nisou Tel.: 483 367 800, fax: 483 710 884 www.stahuj.cz | www.stable.cz | www.otoman.cz | www.vareni.cz

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Re: [CentOS] Newbie ADSL configuration, ppp0 can't activate &
by Lanny Marcus 15 Jul '07

15 Jul '07

>Message: 10 >Date: Sat, 14 Jul 2007 11:44:52 -0400 >From: Walt Reed <centos(a)linuxguy.com> >Subject: Re: [CentOS] Newbie ADSL configuration, ppp0 can't activate & >Message-ID: <20070714154451.GA15061(a)linuxguy.com> <snip> >Some pain-in-the-ass ISP's force you to do PPPoE instead of DHCP. Some >give you a DSL modem that does NAT and the PPPoE stuff for you, some >don't. If you have one that doesn't, a cheap Linksys "router" can do >the NAT and PPPoE for you if you don't fee comfortable doing it in >Linux. Walt in our former home, we had Cable Modem access for 3+ years and I used a Linksys Router/Switch there. We live in South America, so I'd need to have one shipped from the states. I think I can get it going, with IPCop or Devil-Linux. >on a 1.5/384 DSL connection. Our new connection is 256. After using dial up for 3 1/4 years, that's fast. :-) It's a lot slower than when we had Cable Modem service, but a huge improvement! I wanted WiMAX access, which is available in the city of Cali, but it's not available in our town and who knows when if ever it will be available. I downloaded the latest versions of Devil-Linux and IPCop this morning. They both have things I like. Devil-Linux does not require a hard drive and runs off a CD-ROM and a write protected floppy, which for security, I think is better. IPCop has much more documentation, can run headless and has some other things I like. I think I will try IPCop first. Thanks much for your input! Lanny

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Re: SOLVED: Re: [CentOS] Newbie ADSL configuration, ppp0 can't activate & config not found
by Lanny Marcus 15 Jul '07

15 Jul '07

>Message: 26 >Date: Sun, 15 Jul 2007 07:59:09 -0400 >From: Dan Halbert <halbert(a)everyzing.com> >Subject: Re: SOLVED: Re: [CentOS] Newbie ADSL configuration, ppp0 > can't activate & config not found >Message-ID: <469A0C0D.3030400(a)everyzing.com> >Great! By the way, you should not even need to specify the DNS >servers. >In the DHCP info your router gives your machine, it will probably list >itself as the DNS server. (DHCP does not return just an IP address but >also a bunch of other info such as subnet mask and DNS servers.) Yes. When I checked the network configuration for eth0, the 2 IP addresses for their DNS servers that I'd entered, had been changed, to 192.168.1.1, the IP of the ADSL Router. >The router just forwards DNS requests it gets on to the real DNS >servers (it found out those when it itself connected to the ISP).. So >don't specify the DNS servers yourself and then you won't have to do >anything if the ISP's DNS serves change. That works. I will change that in the other boxes (also dual boot), after I have the Firewall/Router box up and running. When I did ifconfig -a it came back with inet addr 192.168.1.10 Bcast 192.168.1.255 and Mask 255.255.255.0 When I did nslookup 192.168.1.10 it came back with server 192.168.1.1 Address 192.168.1.1#53 and ** Server can't find 10.1.168.192.in.addr.arpa NXDOMAIN I downloaded the lastest versions of Devil-Linux and IPCop this morning. I think I will try IPCop first, because it can be headless and has a lot of documentation and other features I like. Devil-Linux does not require a hard drive, which I believe would be better for security.

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disabling SELinux on CentOS: a good idea?
by Rogelio Bastardo 15 Jul '07

15 Jul '07

I was banging my head against the wall trying to figure out why my Nagios install wasn't working on CentOS 4.5 (I'm used to Debian), and so I disabled SELinux and everything magically started working. Is this a good long term idea? Or is there a better way of doing things?

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Centos on a Flash drive and Micro drive
by Robert Moskowitz 15 Jul '07

15 Jul '07

I am considering putting together a 'micro server' that I can easily travel with. I am seriously considering the decTOP, as at $99 (plus the cost of a 256MB SIMM) is amazingly priced. But I want to run on batteries, so trash a real hard drive. I have a couple of IDE to Compact flash adapters that support 2 flash cards. So I was considering a 4Gb (or even 2Gb) cheap real fash card for the OS and a 4 or 8 Gb micro drive (I have a 4Gb sitting in a drawer gathering dust got to figure out how to fix its paritions that I messed up). So I was thinking to put the more static parts of the OS on the flash card and the not static parts on the micro drive. Obviously the Swap partition, /home, and /var/log go onto the micro drive. What else? /tmp? Are /dev and /proc real things on disk or only pointers to the various devices? And then how do I put all these directory trees on the micro drive. I currently use a LVM partition for my /home on my notebook, but this is a lot more. Do I do Symbolic links? Or what. Are there any howtos? I have not found anything to help me so far. Probably got at least a week to figure this out. Obviously I don't have the system right now. And monday it is off to San Fran for the IEEE 802 meeting... (and the following week IETF in Chicago, family gets really upset when I have these 'back-to-back' conferences).

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CentOS-announce Digest, Vol 29, Issue 7
by centos-announce-request＠centos.org 15 Jul '07

15 Jul '07

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-2007:0675 Moderate CentOS 4 i386 perl-Net-DNS - security update (Johnny Hughes) 2. CESA-2007:0675 Moderate CentOS 4 x86_64 perl-Net-DNS - security update (Johnny Hughes) 3. CESA-2007:0519 Moderate CentOS 4 x86_64 xorg-x11 - security update (Johnny Hughes) 4. CESA-2007:0519 Moderate CentOS 4 i386 xorg-x11 - security update (Johnny Hughes) 5. CESA-2007:0662 Moderate CentOS 4 x86_64 httpd - security update (Johnny Hughes) 6. CESA-2007:0662 Moderate CentOS 4 i386 httpd - security update (Johnny Hughes) 7. CESA-2007:0662 Moderate CentOS 4 ia64 httpd - security update (Pasi Pirhonen) 8. CESA-2007:0662 Moderate CentOS 4 s390(x) httpd - security update (Pasi Pirhonen) ---------------------------------------------------------------------- Message: 1 Date: Sat, 14 Jul 2007 12:44:40 -0500 From: Johnny Hughes <johnny(a)centos.org> Subject: [CentOS-announce] CESA-2007:0675 Moderate CentOS 4 i386 perl-Net-DNS - security update To: CentOS-Announce <centos-announce(a)centos.org> Message-ID: <46990B88.9080303(a)centos.org> Content-Type: text/plain; charset="iso-8859-1" CentOS Errata and Security Advisory 2007:0675 https://rhn.redhat.com/errata/RHSA-2007-0675.html The following updated files have been uploaded and are currently syncing to the mirrors: i386: perl-Net-DNS-0.48-2.el4.i386.rpm src: perl-Net-DNS-0.48-2.el4.src.rpm

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SOLVED: Re: [CentOS] Newbie ADSL configuration, ppp0 can't activate & config not found
by Lanny Marcus 15 Jul '07

15 Jul '07

>Message: 23 >Date: Fri, 13 Jul 2007 22:11:59 -0400 >From: Dan Halbert <halbert(a)everyzing.com> >Subject: Re: [CentOS] Newbie ADSL configuration, ppp0 can't activate & > config not found >Message-ID: <469830EF.3080601(a)everyzing.com> >mailing-lists(a)computer2.com wrote: > I am frustrated. This is a dual boot box, Win XP (Spanish) and CentOS >4.4. The phone company man came today and installed ADSL to the WinXP <snip> >Dan wrote: If you have a router, then the ADSL connection you have is >handled by the router, and is invisible to you, on the LAN side of the <snip> Thank you! I was busy and gone most of the day yesterday and didn't touch the box after about 7 A.M. Early this morning, I came in here and in two (2) minutes, the box was online in Linux. :-) The problem was that I'd seen in System Tools > Internet Configuration Wizard (internet-druid) and I set up an xDSL connection ppp0, which was not necessary, as you wrote, because the ADSL Router the phone company man brought does the log in. After I deleted the ppp0, I set up eth0 again, to get my IP from the ISP via DHCP and I put in the 2 IP numbers for their DNS servers, restarted the Network and I am online! :-) I knew this was something extremely simple, but it was Friday the 13th and to use Johnny's phrase, I had a cubic butt load of frustration. :-) This will hopefully make it easier for me to get Devil-Linux configured, for my Firewall/Router box. Walt Reed: I get the Mailing List Digest, which will come in about 90 minutes, but I looked at the archives this morning and I also saw your post, which is much appreciated. I am going to try to use Devil-Linux and if I can't get that working, I will use IPCop, for my Firewall/Router. Thanks to both of you for replying to me and to everyone who participates in this great mailing list! Lanny

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Postfix Question
by ethericalzen＠gmail.com 15 Jul '07

15 Jul '07

I've googled around and although I get a lot of hits about postfix smarthost authentication with ssl, I can not find out how to actually accomplish the task. I've read through smatterings of postings from Neophasis and the like searching for just the syntax and what file (I assume it's main.cf) I should be using; however, any smtpd_ lines I have tried result in postfix hanging and refusing to deliver mail. I could simply cease using smarthost, but my ip address is dynamic (yes I know stop yelling at me I'm poor right now) so mail bounces to some domains if I don't use smarthost. The server I'm running postfix on is CentOS 4 (fully updated). Postfix version is 2.2.10-1.1.el4 (from rpm -qa). I have not had sufficient downtime to upgrade to CentOS 5. Should I do that? Sincerely -- Alex White ethericalzen(a)gmail.com Life is a prison, death is a release

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Tired of temp induced shutdowns
by Robert Moskowitz 15 Jul '07

15 Jul '07

My notebook has a habit of getting hot, and Centos just shuts down. Just did it again: Jul 15 01:35:12 nc4010 kernel: ACPI: Critical trip point Jul 15 01:35:12 nc4010 kernel: Critical temperature reached (113 C), shutting down. Jul 15 01:35:12 nc4010 kernel: Critical temperature reached (55 C), shutting down. Jul 15 01:35:13 nc4010 shutdown[9847]: shutting down for system halt Jul 15 01:35:13 nc4010 gconfd (rgm-2904): Received signal 15, shutting down cleanly Jul 15 01:35:13 nc4010 gconfd (rgm-2904): Exiting What I would like to know is where are the threshholds stored? It would be nice if some alarm went off (like with low battery), giving me time to grab the blue-ice block out of the freezer (or at least saving some work and pointers!).

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Centos on the decTOP?
by Robert Moskowitz 15 Jul '07

15 Jul '07

https://store.dataevolution.com/ProductDetails.asp?ProductCode=DT%2D7001 For $99 a nice little system with AMD Geode GX500 128Mb memory and 10Gb disk. Upgrade to 256Mb and off we go? Replace the hard drive with a Flash card, and run off a battery pack? Add Bluetooth (lower power draw that 802.11) and run IP over it to your desktop.... It does have ethernet, so a crossover cable works too. Would be nice if I could know if I can pull that GX500 and put in a slightly faster cpu....

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