- Discuss - lists.centos.org

Re: [CentOS] what pkg contains libstdc++-libc6.2-2.so.3
by Les Bell 02 Feb '11

02 Feb '11

Hal Davison <hal(a)faams.net> asked as above: And the answer is: compat-libstdc++-296-2.96-138 (on Centos 5.5, that is). Best, --- Les Bell [http://www.lesbell.com.au] Tel: +61 2 9451 1144

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CentOS 5 updates
by Ben McGinnes 02 Feb '11

02 Feb '11

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Re: [CentOS] Kernel Errors Present...
by Keith Roberts 01 Feb '11

01 Feb '11

On Wed, 12 Jan 2011, John R Pierce wrote: > > To: centos(a)centos.org > From: John R Pierce <pierce(a)hogranch.com> > Subject: Re: [CentOS] Kernel Errors Present... > > >> In the BIOS I turn DMA off for /dev/hda and /dev/hdc, >> but they still show up in /proc/ide/.../settings as >> using_dma 1. > > > say HUH? IDE PIO modes are like 3-7 MBytes/sec and require 100% CPU > utilization during the transfer phase. why in dogs name would you be > doing this in 2011 ? ...snip... > January 12, 2011 06:26PM > Use the modern, 80 wire cables, and trust the technology - > it's come a long way. Thanks for all the replies concerning this. I have bought an off-the-shelf 24" round ATA 133 IDE cable, and installed that in place of the 40-wire cable. The problem now appears to be fixed. Been keeping an eye on my logwatch emails, and they are no longer reporting this problem. Kind Regards, Keith Roberts ----------------------------------------------------------------- Websites: http://www.karsites.net http://www.php-debuggers.net http://www.raised-from-the-dead.org.uk All email addresses are challenge-response protected with TMDA [http://tmda.net] -----------------------------------------------------------------

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How to relocate $HOME directory
by Soo-Hyun Choi 01 Feb '11

01 Feb '11

Hi there, As you know, $HOME is generally located at "/home/$username" by default. I would like to re-locate all users' $HOME directories to something like "/export/home/$username" without having a hassle/trouble. Initially, I've thought of just copying them to the new directory (under /export/home/xxx), but guessed it might trouble for the normal use (I'm pretty new to CentOS, although many experiences with Debian/Ubuntu). Is there any good tricks (or caveats) when moving users' home directory cleanly with CentOS? (I'm with CentOS 5.5 x86_64) Cheers, Soo-Hyun

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syslog socket limit
by Xinhuan Zheng 01 Feb '11

01 Feb '11

Hi, Syslogd has an option "-a socket". According to man page, this additional sockets is limited to 19. Currently I do need to have more than 19 sockets that syslogd needs to listen on. How can I accomplish that if I don't want to change syslogd.c code? Thanks, - xinhuan

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centos 4.8 or centos 5.5 for server is great?
by Yang Yang 01 Feb '11

01 Feb '11

hi,i am new guy for linux world i made a server (centos5.5 8g ram 300g*2 sas 15k harddisc ),but some my friend use linux feveral years advise me use centos 4.8,he said it is much good than centos 5.5 it is trouble me ,is it newest is good than older? please give me some advice Thanks all

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sshd problem
by Yang Yang 01 Feb '11

01 Feb '11

my server is on centos 5.5,it is just a new reinstall system i build a php depend on server and used nginx,php,mysql ssh is default 22 port The system perfomance good a few time.but it is always happen a problem only need hardware reboot to solve.the server is on idc.so i can not see the local screen information. the appearance is: 1.it can not use ssh to connect,it show server is down or rebooting 2.ping is ok 3.http can show nginx's information(nginx/0.8.46),but can not load right page,and it show 403 forbiden page i use another server use ssh -vv xxx.xxx.xxx.xxx,and the responce is: SSH2_MSG_KEXINIT sent close sshd hangs after SSH2_MSG_KEXINIT sent i do not know what happen,please give me a good answer thanks erverbody

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python-dbus
by David McGuffey 01 Feb '11

01 Feb '11

What is this all about? Seems to be related to my attempt to load hplip-3.10.9 to support an HP Photosmart 3210 all-in-one for scanning through saned. from /var/log/messages: Jan 31 20:07:26 desk python: [2851]: error: dbus failed to load (python-dbus ver. 0.80+ required). Exiting... Jan 31 20:07:49 desk python: hp-systray[3402]: warning: Qt/PyQt 4 initialization failed. When I check for python-dbus with yum, it doesn't show in the nomal mirrors. [root@desk log]# yum info python-dbus Loaded plugins: fastestmirror, priorities Loading mirror speeds from cached hostfile * addons: mirrors.finalasp.com * base: yum.singlehop.com * centosplus: mirror.web-ster.com * extras: mirrors.finalasp.com * rpmforge: fr2.rpmfind.net * updates: mirror.trouble-free.net addons | 951 B 00:00 base | 2.1 kB 00:00 centosplus | 1.9 kB 00:00 extras | 2.1 kB 00:00 rpmforge | 1.1 kB 00:00 updates | 1.9 kB 00:00 Excluding Packages in global exclude list Finished 202 packages excluded due to repository priority protections Error: No matching Packages to list [root@desk log]#

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OT: Recommendations for a virtual storage server
by carlopmart 01 Feb '11

01 Feb '11

Hi all, I need to install a virtual machine acting as a virtual storage server under CentOS 5.x (using kvm, xen, virtualbox or vmware). This virtual storage machine needs to server storage to another ESXi server and at the same time to the host where is installed. This is due to the limitations of hardware I have available. Both hosts needs to server several machines. It is very important that the virtual machine consumes the least resources possible (host has 5GB RAM and i need to run three virtual machines minimum, including this storage server as a virtual machine). What can be better solution: CentOS, NexentaStor, openfiler ...?? Many thaks. -- CL Martinez carlopmart {at} gmail {d0t} com

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Groups
by Jason S-M 01 Feb '11

01 Feb '11

Hi All, On one of my servers I have a personal account and root. I disable root for ssh logins and run ssh on an alternative port. When 'scp'ing files I usually scp them up, then ssh in 'su' root and move them to /var/www/html. I can sftp I realize, but what group can I add my personal account to, but not root, so I can sftp in and put the files in /var/www/html? Secondarily /var/www/html/<my website> is owned by root:root, can I change this to something else so my sftp'ing is easier? apache:apache as owner? -Jason

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Re: [CentOS] RAID support in kernel?
by Les Bell 31 Jan '11

31 Jan '11

Kenni Lund <kenni(a)kelu.dk> wrote: >> Fakeraid is a proprietary software RAID solution, so if your motherboard suddently decides to die, how will you then get access to your data? << Obviously, you restore it from a backup. RAID is not a substitute for backups. Best, --- Les Bell [http://www.lesbell.com.au] Tel: +61 2 9451 1144

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zfs experience
by ann kok 31 Jan '11

31 Jan '11

Hi Anyone is trying zfs in linux. Any experience can be shared Thank you

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Building RPMs for CentOS
by Marcos Lois Bermúdez 31 Jan '11

31 Jan '11

Hi. Some times i need to build packages for CentOS, the major requeriment is build some missing module or package newer version required to run some sotware. I setup a mock build enviroment to compile packages, all is working as expected, but i enconter problem to share this work in a source repo, i try to figure out how other people are making this, in CentOS i have no idea on which source repo are kept the package metadata, specs and patches, but in other repos, epel for example it only versions specs and patches, all binary files are downloaded in the time that the srpms are built to send to mock (koji in their case), fedora is swiching from a Makefile per package to a fedpkg tool to work with package sources. I see that a friend will be spectool, and some of scripting i can get a build system from source version control, but i think that this already is made, so i'm don't want to reinvent the well, i prefer help other people in make more robust system. There is a currently model for package metadata store and common task work? Regards.

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Re: [CentOS] CentOS and Dell MD3200i / MD3220i iSCSI w/ multipath -- slightly OT
by Rajagopal Swaminathan 31 Jan '11

31 Jan '11

Greetings, On 1/22/11, Edward Morbius <dredmorbius(a)gmail.com> wrote: > CentOS is not a Dell-supported configuration, and we've had little helpful > advice from Dell. There's been some amount of FUD in that Dell don't seem > to know what Dell's own software installation (the md3 > > Dell doesn't seem to have much OS experience generally. > +1 It is to be expected from Dell as they outsource support to non-"equal opportunity" employers who do not hire support agents beond 40 years of age (per HR). Above fact. below imho Now, experience often helps reach the source of the problem much faster that fast-talking street-smart agents who proliferated. It is sad that IT industry treats its early community members so callously. I don't know but Dell seems to be headed the Sun way -- open for takeover by HP/IBM Above imho. Regards, Rajagopal

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RAID support in kernel?
by Michael Klinosky 31 Jan '11

31 Jan '11

Hello. I'm setting up a computer that will run 'CentOS 6 server'. The MB is an Asus with a hw raid controller (Promise PDC-20276), which I want to use in RAID-1 mode. I noted (from a MB website) that it also needs a driver - which is probably why it's called a 'fakeraid'. So, I've been trying to determine if any recent kernels support this chip. Using google.com/linux, I found lots of hits dating about 2002 - 04, and referencing the 2.4 kernel (which had the driver compiled into it). But, nothing newer. I checked kernel.org and kernelnewbies.org - I see that raid-1 is supported. But, I can't find any reference to this chip. How can I find out what drivers are compiled into a given kernel? Or, basically what hardware a given kernel supports?

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Re: [CentOS] Ext4 on CentOS 5.5 x64
by cpolish＠surewest.net 31 Jan '11

31 Jan '11

Sorin Srbu wrote: <snip> > Anyway, I get a bad block message when running fsck, and am not sure > whether this is a interface problem between the chair and the monitor or > something with the tech preview. <snip> Having just live through this issue, I recommend you run the extended (long) SMART test on all your drives and check the reports. The relevant package to install is smartmontools. It's worth investing a little time in setting up the package. I ended up with this incantation in /etc/smartd.conf : /dev/hda -T normal -p -a -o on -S on -s (S/../.././02|L/../../6/03) -m root@localhost To execute the extended tests (doesn't mess with your data): # smartctl --test=long /dev/hda To view the test results about 80 minutes later: # smartctl --log=selftest /dev/hda and so on. -- Charles Polisher

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RHEL-6 vs. CentOS-5.5 (was: Static assignment of SCSI device names?)
by Chuck Munro 30 Jan '11

30 Jan '11

Hello list members, My adventure into udev rules has taken an interesting turn. I did discover a stupid error in the way I was attempting to assign static disk device names on CentOS-5.5, so that's out of the way. But in the process of exploring, I installed a trial copy of RHEL-6 on the new machine to see if anything had changed (since I intend this box to run CentOS-6 anyway). Lots of differences, and it's obvious that RedHat does things a bit differently here and there. My focus has been on figuring out how best to solve my udev challenge, and I found that tools like 'scsi_id' and udev admin/test commands have changed. The udev rules themselves seem to be the same. Regarding networking, all of my 'ifcfg-*' files from CentOS-5.5 worked well, including bridging for KVM. Of course, one of the first things I did was remove that atrocious NetworkManager package ... it needs to be rewritten to make it a *lot* more intuitive. RedHat uses it during installation to manually configure the NICs, which I think is a mistake. I much prefer the way CentOS anaconda has done it so far, as a separate install menu form. The performance of the machine seemed to be better with the newer kernel, which is encouraging. I suspect we can look forward to a number of improvements. I've just managed to scratch the surface. I do expect there may be a few challenges for those of us upgrading a system from 5.x to 6, where some user-written admin scripts could break depending on the system commands they use. I look forward to CentOS-6 and all the goodies we can expect, and I'm quite happy to wait until the CentOS crew does their thing before releasing it ... they deserve a lot of credit for doing a thorough job all these years. Chuck

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py-yaml complaints from yum
by Tim Dunphy 30 Jan '11

30 Jan '11

hello list!! I'm having a curious issue.. if I type yum update -y the system complains of a PyYAML dependency: --> Finished Dependency Resolution PyYAML-3.08-4.el5.x86_64 from installed has depsolving problems --> Missing Dependency: libyaml-0.so.1()(64bit) is needed by package PyYAML-3.08-4.el5.x86_64 (installed) Error: Missing Dependency: libyaml-0.so.1()(64bit) is needed by package PyYAML-3.08-4.el5.x86_64 (installed) You could try using --skip-broken to work around the problem You could try running: package-cleanup --problems package-cleanup --dupes rpm -Va --nofiles --nodigest if I do yum whatprovides "*/libyaml-0.so.1" this is what I get back: [root@VIRTCENT14:~] #yum whatprovides "*/libyaml-0.so.1" Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * addons: mirror.cogentco.com * base: hpc.arc.georgetown.edu * centosplus: mirror.steadfast.net * contrib: hpc.arc.georgetown.edu * epel: mirror.seas.harvard.edu * extras: mirror.atlanticmetro.net * remi: rpms.famillecollet.com * rpmforge: fr2.rpmfind.net * updates: mirror.ash.fastserv.com libyaml-0.1.2-3.el5.i386 : YAML 1.1 parser and emitter written in C Repo : epel Matched from: Filename : /usr/lib/libyaml-0.so.1 libyaml-0.1.2-3.el5.x86_64 : YAML 1.1 parser and emitter written in C Repo : epel Matched from: Filename : /usr/lib64/libyaml-0.so.1 libyaml-0.1.2-3.el5.x86_64 : YAML 1.1 parser and emitter written in C Repo : installed Matched from: Filename : /usr/lib64/libyaml-0.so.1 but it looks like /usr/lib64/libyaml-0.so.1 is already installed on this system. [root@VIRTCENT14:~] #ls -l /usr/lib64/libyaml-0.so.1 lrwxrwxrwx 1 root root 18 Dec 19 22:46 /usr/lib64/libyaml-0.so.1 -> libyaml-0.so.1.1.0 So what's yum complaining about here, and may I have some advice on how to correct this error? thanks CentOS list! You have a history of awesomeness which I respect. -- GPG me!! gpg --keyserver pool.sks-keyservers.net --recv-keys F186197B

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Amazon EC2 - building a minimal centOS ebs bootable image
by Sanjay Arora 29 Jan '11

29 Jan '11

Hello Looking to build CentOS based micro EC2 instance bootable from Amazon EBS. Want that the image be minimal, so that I can add only the rpms I want. Despite looking could not find a way to import a CentOS image from scratch or an existing minimal CentOS image that is bootable from EBS. My server must must persist, as I cannot handle issues with a dynamic server, so I want to use a server that can boot from EBS. Am a EC2 newbie and a follow the instructions kind of a Sys Admin ;-) Please guide me to links, howtos and give experienced advice, in general. With best regards. Sanjay.

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httpd LDAP auth module
by Carlos S 29 Jan '11

29 Jan '11

Hi, I am looking at LDAP module for Apache httpd for authentication. The 'yum install' gives me 'mod_authz_ldap.i386 0:0.26-9.el5_5.1', whereas on Apache documentation site I find mod_authNz_ldap module. Both modules appear to be different looking at available directives. Any clues or suggestions on which module should be used? Where can I find documentation for mod_authz_ldap? -- CS.

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offsite encrypted backups?
by Eero Volotinen 29 Jan '11

29 Jan '11

Hi List, Any idea for remote encrypted backup system? files must be encrypted on local side ? duplicity? any better ideas? -- Eero

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centos 5.5: iptables: module recent
by Helmut Drodofsky 29 Jan '11

29 Jan '11

Hello, I have well performing iptables in centos 5.2 and 5.3 : -A INPUT -m state --state NEW -m recent --update --seconds 60 --hitcount 1000 -p tcp --dport 25 -j LOG --log-prefix "FW DROP IP Flood: " Centos 5.5, updated today: Without -hitcount : iptables accept the line Including -hitcount : iptables brings an error message: Applying iptables firewall rules: iptables-restore: line 47 failed [FAILED] The Line Number is always the number of the COMMIT statement. Not the line number of the statement with the recent module. So I think, iptables is missing something, What? When I add the line interactive, the result is [root@host sysconfig]# iptables -A INPUT -m state --state NEW -m recent --update --seconds 60 --hitcount 1000 -p tcp --dport 25 -j LOG --log-prefix "FW DROP IP Flood: " iptables: Unknown error 18446744073709551615 The man page describes the parameter: [!] --seconds seconds This option must be used in conjunction with one of --rcheck or --update. When used, this will narrow the match to only happen when the address is in the list and was seen within the last given number of seconds. [!] --hitcount hits This option must be used in conjunction with one of --rcheck or --update. When used, this will narrow the match to only happen when the address is in the list and packets had been received greater than or equal to the given value. This option may be used along with --seconds to create an even nar- rower match requiring a certain number of hits within a specific time frame. Without -hitcount the rule is worthless. Suggestions? Many Thanks Helmut

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Cold install kernel .config file
by Tom G Murphy 29 Jan '11

29 Jan '11

Convey uses a highly modified CentOS kernel to work with our attach coprocessor. Currently to setup a system for delivery we do a cold install using a "stock" CentOS cold install using kickstart. During that cold install we lay down our modified kernel and reboot the system with that kernel. After the reboot we are able to access the coprocessor management processor and down load updated firmware then reboot the system to have a completed install. My goal is to be able to boot a "modified" kernel on the cold install step so we can download the firmware updates and eliminate the second boot. I have tried using using the bzImage generated from the modified kernel build but that kernel fails to be able to load the kickstart file :-( I have done searches trying to find the .config file used to build the kernel booted during cold install but have had no luck. I am guessing I have either have too much or too little included in the kernel. I tried to make sure everything I thought was needed were not modules but included in the kernel. Does anyone have any suggestions? --- Tom Murphy Platform Support Convey Computer 1-866-338-1768 tmurphy(a)conveycomputer.com Support Site: http://conveysupport.com/ Support Ticket : http://rt.conveysupport.com/

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Re: [CentOS] Static assignment of SCSI device names?
by Chuck Munro 29 Jan '11

29 Jan '11

> Les Mikesell kindly wrote: >> > >> > Identifying drives by their ID string (which includes the drive's serial >> > number) and assigning names in the rules works ok. BUT, what happens >> > when I have to swap out a failed drive? The serial number (and possibly >> > model number) changes, and the udev assignment should fail, probably >> > assigning an unexpected /dev/sd? name. RAID rebuild would choke until I >> > change the MD device assignment. > If you can figure things out for the initial md device creation, > subsequent assembly uses the uuid to match up the members and doesn't > care if the disks have been moved around either physically or by > detection order. And if you are hot-swapping drives and rebuilding > manually, you should be able to find the just-assigned name with 'dmesg'. > That's how I've been doing it with the two RAID-6 servers I have now, but in my advanced age I'm getting lazy. I did figure out how to tag the drive by path using the '-i' option to scsi_id and filtering by a "RESULT==<path> *" expression. However, something has gone very much astray, because now the rules don't do anything ... the system assigns names in the order scanned despite having added the udev rules before the default '50-udev.rules' is executed. I'm a bit mystified by this. Before I started messing around, filtering by drive id string did work, now it doesn't. Is there a small database somewhere I need to trash? Mike's suggestion is intriguing and makes me wonder if I can manually label a replacement drive with the same UUID as the failed one (assuming I keep records, of course). Since all drives in the array are partitioned exactly the same way, I can have one or two spares on the shelf pre-partitioned, ready to be given a UUID. I don't plan to hot swap. Still, I'd love to be able to use udev rules to assign names, if only to make life easier ... inquiring minds need to know why I suddenly can't get any rules to work. Maybe I need to re-install. I have just downloaded a trial version of RHEL-6 which I should try, to see if it handles this stuff more gracefully. It'll do for experimentation until CentOS-6 arrives. Chuck

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internet connection tester script
by kellyremo 29 Jan '11

29 Jan '11

http://pastebin.com/raw.php?i=rykHdvBh bix.hu and www.yahoo.com are "pingable" test sites. 127.0.0.1 could not be pinged [firewall drops all icmp] i have a "oneliner" that echoes if theres "internet connection or no". $ ping -W 1 -c 2 bix.hu >& /dev/null && ping -W 1 -c 2 www.yahoo.com >& /dev/null && echo "internet connection ok" || echo "no internet connection" internet connection ok $ ping -W 1 -c 2 127.0.0.1 >& /dev/null && ping -W 1 -c 2 www.yahoo.com >& /dev/null && echo "internet connection ok" || echo "no internet connection" no internet connection $ ping -W 1 -c 2 127.0.0.1 >& /dev/null && ping -W 1 -c 2 127.0.0.1 >& /dev/null && echo "internet connection ok" || echo "no internet connection" no internet connection $ ping -W 1 -c 2 bix.hu >& /dev/null && ping -W 1 -c 2 127.0.0.1 >& /dev/null && echo "internet connection ok" || echo "no internet connection" no internet connection $ ping -W 1 -c 2 bix.hu >& /dev/null && ping -W 1 -c 2 www.yahoo.com >& /dev/null && echo "internet connection ok" || echo "no internet connection" internet connection ok $ Ok! But: if i want the "oneliner" to only go along when theres internet connection: $ while $TORF; do ping -W 1 -c 1 bix.hu >& /dev/null && ping -W 1 -c 1 www.yahoo.com >& /dev/null && TORF=false || TORF=true; done $ while $TORF; do ping -W 1 -c 1 127.0.0.1 >& /dev/null && ping -W 1 -c 1 www.yahoo.com >& /dev/null && TORF=false || TORF=true; done $ while $TORF; do ping -W 1 -c 1 127.0.0.1 >& /dev/null && ping -W 1 -c 1 127.0.0.1 >& /dev/null && TORF=false || TORF=true; done $ while $TORF; do ping -W 1 -c 1 bix.hu >& /dev/null && ping -W 1 -c 1 127.0.0.1 >& /dev/null && TORF=false || TORF=true; done $ while $TORF; do ping -W 1 -c 1 bix.hu >& /dev/null && ping -W 1 -c 1 www.yahoo.com >& /dev/null && TORF=false || TORF=true; done $ It just doesn't work. Goal: if theres no internet connection, then the oneliner must loop until there is internet connection. if theres internet connection the oneliner ends. what am i missing?

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Recommendation for a Linux alternative to Centos - ATH9K disaster
by Always Learning 29 Jan '11

29 Jan '11

I persuaded a reluctant friend to buy a new computer. I enthusiastically extolled the joys and benefits of Centos and promised to install it on his new machine - dual booting with Micro$oft Windoze 7. His super-duper new laptop arrived. Acer, AMD 4 core, fast etc. but not as nice looking as my impressive HP DV5. The wireless refused to connect. After 8 hours on Saturday I could sometimes see hubs in the neighbourhood but could not connect to my own hub using WPA2. iwlist wlan0 scan produced technical details of local hubs - but still could not connect. NetworkManager sometimes froze. Spent many hours Googling for his wifi adaptor Altheros AR928K which uses a driver known as ATH9K. Many others have had a similar problem. Kernel 2.6.27 apparently includes this driver but Centos 5.5 is 2.6.18. On my Sony Vaio netbook I abandoned XP and installed Centos 5.5. No wifi (yet XP had) but luckily for me I eventually discovered the Altheros AR8132 needed ATL1E which, for Centos 5.5, means a kernel modification. Luckily it is on Elrepo as kmod-atl1e. A quick Yum and I was connected. Many thanks to Elrepo. The netbook comes to life with Centos. Its now a really usable machine. XP on a netbook was pure crap. However ATH9K for Centos 5.5 does not exist. This afternoon I had to tell my friend his brand new computer is incompatible with Centos and wifi. Please can anyone recommend a suitable Linux variant with a kernel >= 2.6.27 that is a bit like Centos ? Does anyone know if Centos 5.6 will be on 2.6.18 and whether it will have drivers like ATH9K ? Anyone any idea what kernel version Centos 6 will have ? Thank you. Best regards, Paul GB Centos on 2 VPS, 2 desktops, 1 laptop and 1 netbook. Going cheap : genuine Windoze 95 and 98 installation disks :-)

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TrueCrypt WD External Drive
by Michael D. Berger 28 Jan '11

28 Jan '11

I have a WD Elements 2TB USB hard drive. I would like to encrypt the whole drive with TrueCrypt on my CentOS box. Could someone direct me to a tutorial on how to do this? Ideally, I would also like to access it with my WinXP box, but this part is optional. Thanks for your help. Mike.

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problems with installl ing icecast
by mike cutie and maia 28 Jan '11

28 Jan '11

hi I run this to start the icecaste install and near the end I get this error c belowurned 1 exit status rpmbuild -bb /usr/src/redhat/SPECS/icecast.spec /usr/lib/libxml2.so -ldl -lz -lm /usr/lib/libxslt.so: undefined reference to `xmlX pathcontextSetCache' collect2: ld ret

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Re: [CentOS] Ext4 on CentOS 5.5 x64
by Giuseppe Tanzilli - ServerPlan 28 Jan '11

28 Jan '11

Hi, it works just fine for me, but there is no quota support in the 5.5 ext4 release Giuseppe Il 28/01/2011 08:51, Sorin Srbu ha scritto: >> -----Original Message----- >> From: centos-bounces(a)centos.org [mailto:centos-bounces@centos.org] On >> Behalf Of compdoc >> Sent: Thursday, January 27, 2011 5:09 PM >> To: 'CentOS mailing list' >> Subject: Re: [CentOS] Ext4 on CentOS 5.5 x64 >> >>> For those of you that have been using the ext4 technology preview on >> CentOS 5.5, how has it panned out? Does it perform as expected? How do you > feel the >> stability, creation of the FS and the administration of it is? Ideas and >> comments welcome. >> >> >> I've recently been using ext4 because I have servers with large(ish) > storage >> volumes, and because I know that the next version of centos will support it >> better than 5.5. >> >> I only use it for storage, where I use rsync to copy terabytes of data to >> and from the servers. >> >> It works fine - it's been set and forget so far. Very fast read/write >> speeds. > Same story here. I'm building a new backup server from scratch (with no old > data on it), and while ext3 is nice and stable it's also pretty slow when we > start talking sevenish terabytes. > > My main concern is all the writing on the interweb regarding running an fsck > and a tune2fs after having formatted the filesystem to ext4; some say you > should while some say it isn't necessary. > Anyway, I get a bad block message when running fsck, and am not sure > whether this is a interface problem between the chair and the monitor or > something with the tech preview. > > > > _______________________________________________ > CentOS mailing list > CentOS(a)centos.org > http://lists.centos.org/mailman/listinfo/centos

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SSH Automatic Log-on Failure - Centos 5.5
by Always Learning 28 Jan '11

28 Jan '11

Hallo, I wanted to avoid typing-in my password every occasion I remotely logged-on to a server. I created my SSH keys and copied the public part to the server and renamed it authorized_keys. My command line is: ssh root(a)xxxxxx.com -p 1234 The output shows the logging-on routine wants 3 types of authentication. Surely one successful authentication is sufficient ? OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug1: Connecting to xxxxxx [123.123.123.123] port 1234. debug1: Connection established. debug1: permanently_set_uid: 0/0 debug1: identity file /root/.ssh/identity type -1 debug1: identity file /root/.ssh/id_rsa type 1 debug1: identity file /root/.ssh/id_dsa type -1 debug1: loaded 3 keys debug1: Remote protocol version 2.0, remote software version OpenSSH_4.3 debug1: match: OpenSSH_4.3 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_4.3 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-cbc hmac-md5 none debug1: kex: client->server aes128-cbc hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Host 'xxxxxx' is known and matches the RSA host key. debug1: Found key in /root/.ssh/known_hosts:4 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug1: Next authentication method: gssapi-with-mic debug1: Unspecified GSS failure. Minor code may provide more information Unknown code krb5 195 debug1: Unspecified GSS failure. Minor code may provide more information Unknown code krb5 195 debug1: Unspecified GSS failure. Minor code may provide more information Unknown code krb5 195 debug1: Next authentication method: publickey debug1: Trying private key: /root/.ssh/identity debug1: Offering public key: /root/.ssh/id_rsa debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug1: Trying private key: /root/.ssh/id_dsa debug1: Next authentication method: password ------------------- files in client /root/.ssh are:- -rw------- 1 root root 1675 Jan 27 03:11 id_rsa -rw-r--r-- 1 root root 403 Jan 27 03:11 id_rsa.pub -rw-r--r-- 1 root root 2022 Jan 27 03:07 known_hosts --------------------------------------------- server /root/.ssh id_rsa.authorized_keys -rw-------- -------------------------------------------- The only active lines in /etc/ssh/ssh_config are Host * GSSAPIAuthentication yes SendEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES SendEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT SendEnv LC_IDENTIFICATION LC_ALL -------------------------------------------- After commenting-out GSSAPIAuthentication yes in /etc/ssh/ssh_config the remainder of a new debug report is:- ... debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug1: Next authentication method: publickey debug1: Trying private key: /root/.ssh/identity debug1: Offering public key: /root/.ssh/id_rsa debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug1: Trying private key: /root/.ssh/id_dsa debug1: Next authentication method: password All advice most gratefully received. -- With best regards, Paul. England, EU.

19 42

Re: [CentOS] Ext4 on CentOS 5.5 x64
by compdoc 28 Jan '11

28 Jan '11

>For those of you that have been using the ext4 technology preview on CentOS 5.5, how has it panned out? Does it perform as expected? How do you feel the stability, creation of the FS and the administration of it is? Ideas and comments welcome. I've recently been using ext4 because I have servers with large(ish) storage volumes, and because I know that the next version of centos will support it better than 5.5. I only use it for storage, where I use rsync to copy terabytes of data to and from the servers. It works fine - it's been set and forget so far. Very fast read/write speeds.

3 2

Static assignment of SCSI device names?
by Chuck Munro 27 Jan '11

27 Jan '11

Hello list members, In CentOS-5.5 I'm trying to achieve static assignment of SCSI device names for a bunch of RAID-60 drives on a Supermicro motherboard. The "scsi_id" command identifies all drives ok. The board has one SATA controller and three SAS/SATA controllers ... standard on-board ICH-10 ATA channels, an on-board LSI SAS/SATA controller, and two add-on SAS/SATA contoller cards. There are 13 drives in all, spread across the four controllers, all configured for Linux software RAID. The problem is in management of the drive names and figuring out which drive to pull in case of failure. Unfortunately the BIOS scan detects only the three drives connected to the ICH-10 SATA controller. That's ok because that's where the RAID-1 boot drives are. However, when the kernel starts it assigns those drives last, not first. For this reason I want to use a set of udev rules to assign specific names to the drives plugged into specific ports (to maintain my sanity :-) ). Identifying drives by their ID string (which includes the drive's serial number) and assigning names in the rules works ok. BUT, what happens when I have to swap out a failed drive? The serial number (and possibly model number) changes, and the udev assignment should fail, probably assigning an unexpected /dev/sd? name. RAID rebuild would choke until I change the MD device assignment. Is it possible to assign SCSI drive names by hardware path instead? I especially want the three RAID1+spare boot drives to always be assigned sda/sdb/sdc, because that sorts out other issues I'm having in CentOS-5. In the udev rules file I tried piping the output of "scsi_id -g -i -u -s /block/..." through "cut" to extract the path, but I get no match string when I run "udevtest" against that block device. Does the "PROGRAM==....." clause not recognize the pipe symbol? I tried a little shellscript to provide the RESULT match string, but udevtest didn't like that. Is there a supported way to predictably assign a drive name according to the hardware port it's plugged into ... it would make swapping drives a lot easier, since it becomes 'drive-id-string' agnostic. Better yet, is there any way to tell the kernel the order in which to scan the controllers? I'm also hoping the problem doesn't radically change when I install CentOS-6 on this box. I'm using CentOS-5 just to get practice in using KVM and RAID-60. Thanks for any advice you can offer. Chuck

3 2

how to unmount an NFS share when the NFS server is unavailable?
by Rudi Ahlers 27 Jan '11

27 Jan '11

Hi All, How do I unmount an NFS share when the NFS server is unaivalable? I tried "umount /bck" but it "hangs" indefinitely "umount -f /bck" tells me the mount if busy and I can't unmount it: root@saturn:[~]$ umount -f /bck umount2: Device or resource busy umount: /bck: device is busy umount2: Device or resource busy umount: /bck: device is busy This non-working NFS share is causing problems on the server and I need to unmount it until such a time when the NFS server (faulty NAS) is repaired. -- 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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#!/bin/csh -v not work on CENTOS 5.5
by mcclnx mcc 27 Jan '11

27 Jan '11

We have several "csh" batch scripts using "#!/bin/csh -v". It work fine, before Centos 5.5. After cenos 5.5, it will NOT execute and only list history. Anyone know why? Thanks.

4 5

CentOS-announce Digest, Vol 71, Issue 2
by centos-announce-request＠centos.org 27 Jan '11

27 Jan '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-2010:0936 Important CentOS 4 i386 kernel - security and bug fix update (Tru Huynh) 2. CESA-2010:0936 Important CentOS 4 x86_64 kernel - security and bug fix update (Tru Huynh) 3. CESA-2010:0950 Moderate CentOS 4 i386 apr-util - security update (Tru Huynh) 4. CESA-2010:0950 Moderate CentOS 4 x86_64 apr-util - security update (Tru Huynh) 5. CESA-2010:0966 Critical CentOS 4 i386 firefox - security update (Tru Huynh) 6. CESA-2010:0966 Critical CentOS 4 x86_64 firefox - security update (Tru Huynh) 7. CESA-2010:0967 Critical CentOS 4 i386 seamonkey - security update (Tru Huynh) 8. CESA-2010:0967 Critical CentOS 4 x86_64 seamonkey - security update (Tru Huynh) 9. CESA-2010:0968 Moderate CentOS 4 i386 thunderbird - security update (Tru Huynh) 10. CESA-2010:0968 Moderate CentOS 4 x86_64 thunderbird - security update (Tru Huynh) 11. CESA-2010:0970 Critical CentOS 4 i386 exim - security update (Tru Huynh) 12. CESA-2010:0970 Critical CentOS 4 x86_64 exim - security update (Tru Huynh) 13. CESA-2010:0977 Moderate CentOS 4 i386 openssl - security update (Tru Huynh) 14. CESA-2010:0977 Moderate CentOS 4 x86_64 openssl - security update (Tru Huynh) 15. CESA-2010:0981 Critical CentOS 4 i386 HelixPlayer removal (Tru Huynh) 16. CESA-2010:0981 Critical CentOS 4 x86_64 HelixPlayer removal (Tru Huynh) 17. CESA-2010:1000 Important CentOS 4 i386 bind - security update (Tru Huynh) 18. CESA-2010:1000 Important CentOS 4 x86_64 bind - security update (Tru Huynh) 19. CESA-2011:0013 Moderate CentOS 4 i386 wireshark - security update (Tru Huynh) 20. CESA-2011:0013 Moderate CentOS 4 x86_64 wireshark - security update (Tru Huynh) 21. CESA-2011:0153 Moderate CentOS 4 i386 exim - security update (Tru Huynh) 22. CESA-2011:0153 Moderate CentOS 4 x86_64 exim - security update (Tru Huynh) 23. CESA-2011:0162 Important CentOS 4 i386 kernel - security and bug fix update (Tru Huynh) 24. CESA-2011:0162 Important CentOS 4 x86_64 kernel - security and bug fix update (Tru Huynh) ---------------------------------------------------------------------- Message: 1 Date: Thu, 27 Jan 2011 09:44:20 +0100 From: Tru Huynh <tru(a)centos.org> Subject: [CentOS-announce] CESA-2010:0936 Important CentOS 4 i386 kernel - security and bug fix update To: centos-announce(a)centos.org Message-ID: <20110127084420.GA24522(a)sillage.bis.pasteur.fr> Content-Type: text/plain; charset="us-ascii" CentOS Errata and Security Advisory CESA-2010:0936 kernel security update for CentOS 4 i386: https://rhn.redhat.com/errata/RHSA-2010-0936.html The following updated file has been uploaded and is currently syncing to the mirrors: i386: updates/i386/RPMS/kernel-2.6.9-89.33.1.EL.i586.rpm updates/i386/RPMS/kernel-2.6.9-89.33.1.EL.i686.rpm updates/i386/RPMS/kernel-devel-2.6.9-89.33.1.EL.i586.rpm updates/i386/RPMS/kernel-devel-2.6.9-89.33.1.EL.i686.rpm updates/i386/RPMS/kernel-hugemem-2.6.9-89.33.1.EL.i686.rpm updates/i386/RPMS/kernel-hugemem-devel-2.6.9-89.33.1.EL.i686.rpm updates/i386/RPMS/kernel-smp-2.6.9-89.33.1.EL.i586.rpm updates/i386/RPMS/kernel-smp-2.6.9-89.33.1.EL.i686.rpm updates/i386/RPMS/kernel-smp-devel-2.6.9-89.33.1.EL.i586.rpm updates/i386/RPMS/kernel-smp-devel-2.6.9-89.33.1.EL.i686.rpm updates/i386/RPMS/kernel-xenU-2.6.9-89.33.1.EL.i686.rpm updates/i386/RPMS/kernel-xenU-devel-2.6.9-89.33.1.EL.i686.rpm updates/i386/RPMS/kernel-doc-2.6.9-89.33.1.EL.noarch.rpm source: updates/SRPMS/kernel-2.6.9-89.33.1.EL.src.rpm You may update your CentOS-4 i386 installations by running the command: yum update kernel Tru -- Tru Huynh (mirrors, CentOS i386/x86_64 Package Maintenance) http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xBEFA581B

1 0

Re: [CentOS] Ext4 on CentOS 5.5 x64
by James Hogarth 27 Jan '11

27 Jan '11

On 27 January 2011 15:06, Sorin Srbu <sorin.srbu(a)orgfarm.uu.se> wrote: > Hi all, > > For those of you that have been using the ext4 technology preview on CentOS > 5.5, how has it panned out? Does it perform as expected? How do you feel the > stability, creation of the FS and the administration of it is? Ideas and > comments welcome. > Well for what it's worth it worked out well enough for Redhat that it is a fully supported filesystem in 5.6 and the default in 6.0... same admin tools as ext3 so not much to learn as it were...

3 2

Access to a Power6/Power7 machine?
by Timo Schoeler 27 Jan '11

27 Jan '11

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi, is there anybody here who has access to such a machine and could test errrr... 'some software' there? Please mail me privately. Thanks & best, Timo -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (GNU/Linux) iD8DBQFNQYqAfg746kcGBOwRArE2AJ4+qtS3i0V6a0Y6WocbpGZfne7Q/wCgsphj 1JcOBKH2RuleIQ3X80XFfT4= =AEdz -----END PGP SIGNATURE-----

1 0

Ext4 on CentOS 5.5 x64
by Sorin Srbu 27 Jan '11

27 Jan '11

Hi all, For those of you that have been using the ext4 technology preview on CentOS 5.5, how has it panned out? Does it perform as expected? How do you feel the stability, creation of the FS and the administration of it is? Ideas and comments welcome. Thanks. -- BW, Sorin ----------------------------------------------------------- # Sorin Srbu [Sysadmin, Systems Engineer] # Dept of Medicinal Chemistry, Phone: +46 (0)18-4714482 >3 signals> GSM # Div of Org Pharm Chem, Mobile: +46 (0)701-718023 # Box 574, Uppsala University, Fax: +46 (0)18-4714482 # SE-751 23 Uppsala, Sweden Visit: BMC, Husargatan 3, D5:512b # Web: http://www.orgfarm.uu.se ----------------------------------------------------------- # () ASCII ribbon campaign - Against html E-mail # /\ # # MotD follows: # Legacy MS Tag: Windows has crashed more systems than Michelangelo.

1 0

Help - Seeking recommendations-script to install on CENT OS web server for backup to Network Attached Storage
by Steve Eisenberg 27 Jan '11

27 Jan '11

Hello: I wanted to know if anyone on the list can recommend one or more scripts to install on a CENT OS web server that allows you to back up the entire box to network attached storage? Many thanks, Steve Eisenberg steve.eisenberg(a)gmail.com

3 2

Package updates for 5.4?
by Mitch Patenaude 27 Jan '11

27 Jan '11

We're running a large cluster, and are leery of upgrading them all to 5.5, but would like to find the latest security patches. Is there a repo for this? I can't seem to find a 5.4 specific update repo with anything since last March. Is 5.4 EOL'd? Thanks, -- Mitch

8 11

Re: [CentOS] SSH Automatic Log-on Failure - Centos 5.5
by James Bensley 27 Jan '11

27 Jan '11

Hello all, I've been reading this thread and have a question. I would like to set up passwordless ssh between two servers for some automated tasks but I don't like the paswordless key's option. How can I supply a passphrase when generating my keys but still have this process automated? --James. (This email was sent from a mobile device)

2 2

How to disable screen locking system-wide?
by Bob Eastbrook 26 Jan '11

26 Jan '11

By default, CentOS v5 requires a user's password when the system wakes up from the screensaver. This can be disabled by each user, but how can I disable this system-wide? Many of my users forget to do this, which results in workstations being locked up. Bob

26 75

Re: [CentOS] pen drive, hard disk, cd not being detected
by Ritika Garg 26 Jan '11

26 Jan '11

The problem occurred after I downloaded and compiled the package for enabling wireless on the laptop from the site ' www.broadcom.com/support/802.11/linux_sta.php' which I got to know from the site 'wiki.centos.org/HowTos/Laptops/Wireless/Broadcom'

3 2

Re: [CentOS] ethernet configuration
by Ritika Garg 26 Jan '11

26 Jan '11

'/sbin/ifconfig -a' returns: lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU :16436 Metric:1 RX packets:1489 errors:0 dropped:0 overruns:0 frame:0 TX packets:1489 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:2499880 (2.3 MiB) TX bytes:2499880 (2.3 MiB)

2 1

libsrtp package anywhere?
by Bob Beers 26 Jan '11

26 Jan '11

Hi list, I'm trying to create an asterisk 1.8 rpm with SRTP. I found mention of a libsrtp rpm, <http://qutecom.ipex.cz/RPMS/srtp-1.4.4-1.i386.rpm > in these instructions, <http://www.voip-info.org/wiki/view/Asterisk+SRTP> but it is unreachable (by me, anyway). The libSRTP source is here, <http://srtp.sourceforge.net/download.html>. Has this already been packaged for CentOS 5? Thanks, -Bob Beers

3 13

how to move forward/undo/revert/fix re: a failed CentOS 5.5 to SL 5.5 migration ...
by Larry Vaden 26 Jan '11

26 Jan '11

For various reasons which seemingly fail the necessary/sufficient tests with the benefit of hindsight, I attempted to migrate a shell machine which is the beach front from which I work (not a production server) from CentOS 5.5 to Scientific Linux 5.5 yesterday. Karanbir is quoted on this list as having said something like: "All that you should need to do is install centos-release, remove redhat-release rpms and just yum update the machine, which should bring in all packages changed by CentOS ( since they will have a slightly higher E-V-R )." In other words, is there a get out of jail card based on Karanbir's stanza which will return the machine to a consistent state without a fresh install? The results from the bad migration are below the sig. The stanza used was from the SL mailing list, namely: "To be REALLY sure of a full conversion one might try: yum reinstall $(rpm -qa --qf "%{name}.%{arch} %{vendor} \n" | \ grep -i centos | cut -d ' ' -f 1 | sort | uniq | grep -v kernel) Need special handling for kernel and kernel-devel as you will get messages about multiple versions being allowed, and cutting off the limb on which you are standing is not recommended." In short, I pray for the community's thoughts about how to proceed with either going forward, reverting back to Centos 5.5 or even RHEL 5.5 without having to do a fresh install. THANKS for your help. kind regards/ldv === [root@shell work-2011-01-25-migrate-centos55-to-scientific-linux55]# yum list installed | grep -i centos geronimo-specs.i386 1.0-0.M2.2jpp.12.el5.centos installed geronimo-specs-compat.i386 1.0-0.M2.2jpp.12.el5.centos installed nss.i386 3.12.8-1.el5.centos installed nss-devel.i386 3.12.8-1.el5.centos installed nss-tools.i386 3.12.8-1.el5.centos installed [root@shell work-2011-01-25-migrate-centos55-to-scientific-linux55]# BUT, more devils in the details are: [root@shell SL-rpms]# rpm -ivh kernel* warning: kernel-2.6.18-194.32.1.el5.i686.rpm: Header V3 DSA signature: NOKEY, key ID 192a7d7d Preparing... ########################################### [100%] package kernel-headers-2.6.18-194.32.1.el5.i386 is already installed package kernel-2.6.18-194.32.1.el5.i686 is already installed package kernel-devel-2.6.18-194.32.1.el5.i686 is already installed file /boot/.vmlinuz-2.6.18-194.32.1.el5.hmac from install of kernel-2.6.18-194.32.1.el5.i686 conflicts with file from package kernel-2.6.18-194.32.1.el5.i686 file /boot/System.map-2.6.18-194.32.1.el5 from install of kernel-2.6.18-194.32.1.el5.i686 conflicts with file from package kernel-2.6.18-194.32.1.el5.i686 file /boot/config-2.6.18-194.32.1.el5 from install of kernel-2.6.18-194.32.1.el5.i686 conflicts with file from package kernel-2.6.18-194.32.1.el5.i686 file /boot/symvers-2.6.18-194.32.1.el5.gz from install of kernel-2.6.18-194.32.1.el5.i686 conflicts with file from package kernel-2.6.18-194.32.1.el5.i686 file /boot/vmlinuz-2.6.18-194.32.1.el5 from install of kernel-2.6.18-194.32.1.el5.i686 conflicts with file from package kernel-2.6.18-194.32.1.el5.i686 file /lib/modules/2.6.18-194.32.1.el5/kernel/arch/i386/crypto/aes-i586.ko from install of kernel-2.6.18-194.32.1.el5.i686 conflicts with file from package kernel-2.6.18-194.32.1.el5.i686

1 0

Re: [CentOS] pen drive, hard disk, cd not being detected
by Ritika Garg 26 Jan '11

26 Jan '11

Among many messages that 'dmesg' displays, the following seems to indicate that something might be wrong: mtrr:type mismatch for c1fe0000,10000 old:write-back new:write-combining I can't understand what does the above mean?

1 0

Basic Permissions Questions
by James Bensley 26 Jan '11

26 Jan '11

Hi List :) So, I have a folder1, its owner is user1 who has r+w on the folder. User2 is the group owner who only has read access (when I say user2, I mean the group called user2, because when you make a new user the OS can make them their own group). You can see these permissions below: [user2@host test]$ ls -l drw-r----- 3 user1 user2 28 Nov 2 16:17 folder1 How ever user2 can not 'cd' into this directory, and gets the following out put form 'ls -l folder1' [user2@host test]$ ls -l folder1/ total 0 ?--------- ? ? ? ? ? sub-folder And the sub-folder name is written in white text flashing on a red background. So, it seems to me that there is some permissions problems here. What permissions are required on the group settings to allow a group user to browser folder1 and its sub folders and read the files in side if it isn't 'r' ? **Note: I have used sudo to replicate permissions through the directy structure: [user2@host test]$ sudo ls -l folder1/ drw-r----- 2 user1 user2 4096 Jan 24 06:49 sub-folder -- Regards, James. http://www.jamesbensley.co.cc/ There are 10 kinds of people in the world; Those who understand Vigesimal, and J others...?

4 6

Re: [CentOS] Basic Permissions Questions
by Les Bell 26 Jan '11

26 Jan '11

Edo <ml2edwin(a)gmail.com> wrote: >> If user1 writes a file in folder1 will user2 be made the default group owner, is there a way of enforcing this and with the required privileges (r for files, rx for directories?). Yes. If user1 belongs to the user2 group, that’s how it should [already] work. << The problem here is the RH "User Private Group" scheme, which means that user1 is only a member of the group user1 and user2 is only a member of the group user2. So their group memberships, by default, don't intersect and user2's only access to user1's files is by virtue of the "other/world" permissions, which depend upon the umask (but don't give access, by default). I've written this up (again, for a course I wrote some years ago, but it's still mostly relevant) at http://www.lesbell.com.au/Home.nsf/web/Controlling+Access+to+Files?OpenDocu… - see the section near the bottom entitled " Red Hat's User Private Group Philosophy" which explains how it should be used (the secret is to make the user administrator of their own group with gpasswd -A). The RH approach, imho, is better than a global group, "users", as found on other distros, because there's no real difference between "users" and "world". One easy way to allow shared access - and this will work over Samba - is to create a group for the users, e.g. "accounts" and make the various users members of that group (as a secondary group). Then create a shared directory for them, chown it to be owned by the group (e.g. chown me:accounts /home/accounts) and then set the SGID bit on the directory (chmod 2777 /home/accounts). Now, whenever anybody creates a file in that directory, it will be owned by that user and the shared group "accounts", rather than the primary group of the creator. See the section in that article on "Permissions on directories". I actually haven't tested that approach with SELinux, but I can't see that it would interfere. Best, --- Les Bell [http://www.lesbell.com.au] Tel: +61 2 9451 1144

1 0

Re: [CentOS] Recommendation for a Linux alternative to Centos - ATH9K disaster
by Les Bell 26 Jan '11

26 Jan '11

Always Learning <centos(a)g7.u22.net> wrote: >> Thanks for the good advice. I wondered why the installer gave those choices. Now it makes sense. All my production data resides on /data and I tend to leave the standard directories alone << Paul, if you want a basic explanation of the rationale behind the Linux Filesystem Hierarchy Standard, you might enjoy this article from a course I wrote years ago - it's a little dated, but still applicable today. http://www.lesbell.com.au/Home.nsf/web/What+Goes+Where+on+a+Linux+System?Op… Best, --- Les Bell [http://www.lesbell.com.au] Tel: +61 2 9451 1144

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