Discuss January 2010

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296 participants
322 discussions

mapping sar -d devices to mount points
by Blackburn, Marvin 13 Jan '10

13 Jan '10

Sar -d reports devices like dev253-0. How can I map these to a mount point? I use a mixture of lvm with ext3 filesytems, plain ext3 filesystems on local storage, and ext3 filesystems on powerpath devices. Any help would be appreciated. _____________________________________ "He's no failure. He's not dead yet." William Lloyd George

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Re: [CentOS] Backup server
by Brett Serkez 13 Jan '10

13 Jan '10

On Wed, Jan 13, 2010 at 5:04 AM, Sorin Srbu <sorin.srbu(a)orgfarm.uu.se> wrote: <snip> > The way we currently do backups is to use rsync from the clients to two > folders on an older server that rolls over every other week. This worked fine > for a while, but the rsync is cumulative and the users generate a tremendous > amount of data... <snip> You might want to check out the rsync switches --backup-dir and --suffix. Using them some thing like this: --delete --backup --backup-dir=$MIRROR_DIR/RsyncBckups --suffix=".$DATE" allows you to keep an exact duplication of the original directory and keeping the original files that were either deleted or overwritten in a seperate backup directory with dated suffixes, which can be archived on some regular basis. This should allow you to keep the simplicity of rsync and control the cumulative size. Brett

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Re: [CentOS] Backup server
by Les Mikesell 13 Jan '10

13 Jan '10

Sorin Srbu wrote: > Hi all, > > I've built a new backup server for our linux-clients. > > Is Amanda the way to go for a backup-solution? > > It seems to be pretty powerful, if a bit finickety to set up initially. > > The way we currently do backups is to use rsync from the clients to two > folders on an older server that rolls over every other week. This worked fine > for a while, but the rsync is cumulative and the users generate a tremendous > amount of data every day after having had a client upgrade with newer and > hilariously fast computers for calculation. The previous *nix-admin set it up > this way with rsync, meaning that we in the long run have data that is way > obsolete and get increasingly difficult to maintain. > > As the backup solution must be next to free, ie "free beer", Amanda looks > suitable. > > What do you use for backing up data? Backuppc is good for this - it can use rsync for the transfers (or tar or smb) but all duplicate data is compressed and pooled even if found on different machines and it has an easy setup to control how long old copies are retained. -- Les Mikesell lesmikesell(a)gmail.com

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Re: [CentOS] Backup server
by Max Hetrick 13 Jan '10

13 Jan '10

Sorin Srbu wrote: > Hi all, > > I've built a new backup server for our linux-clients. > > Is Amanda the way to go for a backup-solution? > > It seems to be pretty powerful, if a bit finickety to set up initially. > > The way we currently do backups is to use rsync from the clients to two > folders on an older server that rolls over every other week. This worked fine > for a while, but the rsync is cumulative and the users generate a tremendous > amount of data every day after having had a client upgrade with newer and > hilariously fast computers for calculation. The previous *nix-admin set it up > this way with rsync, meaning that we in the long run have data that is way > obsolete and get increasingly difficult to maintain. > > As the backup solution must be next to free, ie "free beer", Amanda looks > suitable. > > What do you use for backing up data? You can check out BackupPC as well. That's what I use. Regards, Max

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Re: [CentOS] Backup server
by John Doe 13 Jan '10

13 Jan '10

From: Sorin Srbu <sorin.srbu(a)orgfarm.uu.se> > I've built a new backup server for our linux-clients. > Is Amanda the way to go for a backup-solution? > It seems to be pretty powerful, if a bit finickety to set up initially. > The way we currently do backups is to use rsync from the clients to two > folders on an older server that rolls over every other week. This worked fine > for a while, but the rsync is cumulative and the users generate a tremendous > amount of data every day after having had a client upgrade with newer and > hilariously fast computers for calculation. The previous *nix-admin set it up > this way with rsync, meaning that we in the long run have data that is way > obsolete and get increasingly difficult to maintain. > As the backup solution must be next to free, ie "free beer", Amanda looks > suitable. > What do you use for backing up data? Used amanda in the past (a decade ago)... I use bacula now. JD

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kickstart %pre help on C5.4
by Alan McKay 13 Jan '10

13 Jan '10

Hey folks! I'm doing some %pre work for the first time in a very long time, and have been at this all day so far and still don't have anything sorted out properly. First I tried just doing some simple bash stuff like this %pre #!/bin/bash # stuff I reduced "stuff" down to basically a simple "select" statement to echo and read input, just for the sake of debugging. My first problem is that when running the kickstart, the little box would come up saying it is running the pre scripts, but my scripts would never actually run. No output, no prompts, nothing. So after some muddling I tried this : %pre #!/bin/bash exec 1>&3 exec > /dev/tty chvt 3 exec < /dev/tty3 > /dev/tty3 clear # stuff I cannot say I really understand this - it is just something I came across. in any case, now my script seems to run fine, but after it finishes it does not appear to go back to my install. I get messages like : date INFO all kickstart %%pre script(s) have been run date WARNING resolution and depth not specified, try to be sane and that is it - it stops there. I've also tried just : %pre #!/bin/bash chvt 3 clear # stuff With the same results as above. This is all running within VMWare ESXi 4.0 if that matters. What am I missing here? thanks, -Alan -- “Don't eat anything you've ever seen advertised on TV” - Michael Pollan, author of "In Defense of Food"

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Backup server
by Sorin Srbu 13 Jan '10

13 Jan '10

Hi all, I've built a new backup server for our linux-clients. Is Amanda the way to go for a backup-solution? It seems to be pretty powerful, if a bit finickety to set up initially. The way we currently do backups is to use rsync from the clients to two folders on an older server that rolls over every other week. This worked fine for a while, but the rsync is cumulative and the users generate a tremendous amount of data every day after having had a client upgrade with newer and hilariously fast computers for calculation. The previous *nix-admin set it up this way with rsync, meaning that we in the long run have data that is way obsolete and get increasingly difficult to maintain. As the backup solution must be next to free, ie "free beer", Amanda looks suitable. What do you use for backing up data? -- 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: # One tentacle, one vote.

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IO Schedulers
by Tim Nelson 13 Jan '10

13 Jan '10

Greetings all- I'm on a quest to do some serious tuning to some of my production systems. All are on CentOS 5.x ranging from 5.0 to 5.4. I've been reading up on the various IO schedulers available in the kernel and I'm hoping some of you can lend some insightful suggestions. I typically have three classes of system in production: 1. Storage/DB - Backend nodes for the application servers, MySQL, NFS storage serving to frontend nodes (deadline?) 2. Web/SSL - Frontend nodes serving up web application (PHP/MYSQL), heavy SSL {en/de}cryption with both HTTPS/Apache as well as branch locations connecting via OpenVPN (cfq?) 3. Telephony/Communications - VoIP, usually Asterisk (full signaling + media services), massive context switching, very timing sensitive (Meetme conferencing, IAX2 trunk mode, etc) (deadline?) In my reading, I've found most people recommend deadline for DB intensive systems. CFQ seems to be recommended for most other uses. Noop and as seem to be irrelevant. Is this correct or am I way off base? I'm not currently under any enormous load on any of these systems, but I'm planning for growth and would like to see how different schedulers can make a difference. I welcome your suggestions and experiences. :-) --Tim

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Vmware server 1.x
by mattias 13 Jan '10

13 Jan '10

Anyone running centos 1.x on centos 5.3?

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offtopic repo's further discussion
by lostson 13 Jan '10

13 Jan '10

Hello All I may have ruffled some feathers with a comment i made earlier about rpmforge. This was posted back on the ML. On Tue, 2010-01-12 at 14:47 -0600, lostson wrote: > For one stop using rpmforge this repo does nothing but trash a system. Discussion on that for us? So to oblige here is a further discussion on this subject. The reason I say this about rpmforge is because if you install this repo and then do a yum update watch what it will install a huge amount of packages, which 9 times out of 10 is gonna get messy.(which can happen with any repo) And yes I know all about yum-pritorities another plugin that you can install to control the various repo's that one would like to add. I have no problems with this either. Here is my issue the simple joy of playing a mp3 on rhythmbox or amarok should not be a test of one's admin skills or repo knowledge to get it to play. But it is, it is always "here read these 2 pages about yum-priorities plugin and repo's" I mean cmon really? There are 2 repo's CentOS Extras and CentOS Plus could this functionality be placed in here ? Where is the repo I read about months ago that was gonna be available for users to submit packages to ? These are all questions that should be getting asked. Another point to make is on the list forums and other places we are seeing a influx of new users, coming from all sorts of other distro's and to make this simple instance so damn hard and having to pull from outside sources or repo's seems silly to me. Should CentOS not provide a simple and easy solution for some of these things ? I mean standard music and movie playback should be an easy one to get. There seems to be some areas where this is taking place for instance I know there is kmods for alot of things, but I am looking at the plain ol home user who wants to listen to music email basic desktop stuff. And yes I know all about the patent encumbered bs that everyone spouts all the time and i today's times this is just a moot point now. Lets face it some of the other distro's are starting to show their true colors and are often too concerned with updates and the latest and greatest packages. Which is breaking more things than anything else. So people are coming to try out CentOS because of the stability and lets face it one of the best and helpful communities out there right now. And yes I know CentOS is mainly known for the RHEL compatibility and more server usage than anything else and that is the main goal, but why can the project not cater to the home user and tinkerer and developer as well ? All in all I should not of called out rpmforge on such a short straw the work they do is excellent and any 3rd party repo you use has the potential to hose a machine no doubt about it. All in all I'm not saying I want Cent to become one of the "other" distros here I'm just saying is there room for improvement ? To make things easier for the average user at home. We see it all the time on the lists and IRC and I'm thinking a more straightforward approach to the situation and keeping some things not all of course, but the simple ones inhouse and in Cent repo's instead of having to go outside the box just for simple things. Oh well all in all this is just my humble opinion and I'm sure I will get ravaged and picked apart at the seams for this but hey that's me so fire away!! -- LostSon http://lostsonsvault.org CentOS - Its not just for servers ya know...

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Discuss January 2010