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saving at jobs
by Frank Cox 18 Sep '14

18 Sep '14

I can easily save cron jobs in a file by doing this: crontab -l > file.txt And I can restore it with crontab file.txt Is there any way to do the same thing with at jobs? The closest thing that I've managed to find is this: #!/bin/bash atq for each in $(atq | cut -f 1); do echo "JOB $each"; at -c $each; done That works but the output is very wordy and there is no way to restore it other than manually going through the output file and re-entering each job. -- MELVILLE THEATRE ~ Real D 3D Digital Cinema ~ www.melvilletheatre.com

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mirrorlist returns wrong servers
by Hokuto Hoshi 18 Sep '14

18 Sep '14

Hi, We're using CentOS on various servers in Japan. Recently, I found that mirrorlist.centos.org returns servers in China. It makes "yum update" slow. This problem occurs on "update" repo. Our tries and results are follows: ## "os" repository $ curl "http://mirrorlist.centos.org/?release=6.5&arch=x86_64&repo=os" http://www.ftp.ne.jp/Linux/packages/CentOS/6.5/os/x86_64/ http://ftp.tsukuba.wide.ad.jp/Linux/centos/6.5/os/x86_64/ http://ftp.riken.jp/Linux/centos/6.5/os/x86_64/ http://ftp.jaist.ac.jp/pub/Linux/CentOS/6.5/os/x86_64/ ## "updates" repository $ curl "http://mirrorlist.centos.org/?release=6.5&arch=x86_64&repo=updates" http://mirrors.hust.edu.cn/centos/6.5/updates/x86_64/ http://mirrors.yun-idc.com/centos/6.5/updates/x86_64/ http://centos.mirror.cdnetworks.com/6.5/updates/x86_64/ http://ftp.yzu.edu.tw/Linux/CentOS/6.5/updates/x86_64/ http://ftp.isu.edu.tw/pub/Linux/CentOS/6.5/updates/x86_64/ http://mirror.awanti.com/centos/6.5/updates/x86_64/ These results are same when we using "cc=jp" and "ip=(various IP address that is recognized as Japanese by GeoIP)" options. Additionally, the mirrorlist returns correct list when we throw a request via IPv6. I think the mirrorlist has wrong list of "update" repo for Japan. Are there any things that I've missed? Thanks, -- Hokuto Hoshi hok.kanny(a)gmail.com

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Re: [CentOS] documentation for kernel
by kqt4at5v＠gmail.com 18 Sep '14

18 Sep '14

On Tue, 16 Sep 2014, Reindl Harald wrote: > > > Am 16.09.2014 um 15:49 schrieb kqt4at5v(a)gmail.com: >> I am using CentOS 6.5. I am using kernel 2.6.32-431.11.2.el6.i686 and there is a newer version >> 2.6.32-431.29.2.el6.i686 available. Where can I find documentation that tells me the difference in the two version? > > just ask your system for the changelog *and do not* skip updates > that long - they are released for damned good reasons in case > of a LTS distribution > Thank you, how can I query which updates that are available are security updates?

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repoquery -f does not work well.
by dE 18 Sep '14

18 Sep '14

Hi. I've found inconstancy between output of repoquery and rpm. I was looking forward towards apache php 5.4 module which must provided by some package SCL (can someone tell me?). rpm -qf /etc/httpd/modules/mod_proxy.so httpd-2.2.15-29.el6.centos.x86_64 repoquery -qf /etc/httpd/modules/mod_proxy.so so repoquery results in no output yum list installed httpd Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * c6-media: Installed Packages httpd.x86_64 2.2.15-29.el6.centos @c6-media repoquery -qa httpd httpd-0:2.2.15-29.el6.centos.x86_64 No wonder libphp5.so results in no output.

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bizarre problem with performance
by Dan Hyatt 18 Sep '14

18 Sep '14

Hi, I am running centos6-5 on dell620 blades. mirrored local root drives several (including home) mounted filesystems. The other blades are working fine. Top indicates the server is running 1% cpu, and very little memory (idleing) There is no error in the messages file There is no amber lights on the server. When I log into my server it is fine, on my remote mounted home directory. When I cd to root (local disk) and I type ls it just hangs. I ran top, the system is basically idle I ran ifconfig and everything looks good. when I ran df -h it hangs when I run ls on my home directory it is fine when I run ls on my root directory it hangs when I run df -k it hangs I can go into any remote mounted directory and everything works fine. any suggestions.

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pxebooting
by m.roth＠5-cent.us 17 Sep '14

17 Sep '14

Digging into this, as we rework it, here's a question: assuming the system being pxebooted is server 1, and the tftp server is server 2, on server 2, in the menu for pxeboot, is there any way to specify that the image to boot, and the initrd, are on a server 3? That is, MENU repoboot KERNEL repo://my/repo/images/vmlinuz APPEND repo://my/repo/images/initrd.img (or an IP address, like 192.168.1.13, for the server named repo)? mark

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Re: [CentOS] Advice on CentOS 7, software raid 1, lvm, 3 TB
by Jeff Boyce 17 Sep '14

17 Sep '14

Sorry for breaking the threading, as I only get the daily digest. My comments (interspersed) begin with the **. Message: 41 Date: Tue, 16 Sep 2014 18:38:02 -0400 From: SilverTip257 <silvertip257(a)gmail.com> To: CentOS mailing list <centos(a)centos.org> Subject: Re: [CentOS] Advice on CentOS 7, software raid 1, lvm, 3 TB disks Message-ID: <CA+W-zoqD9e826==2H6i9g4CkM_SrqW=yEtFcWntAy=qeaZGdLA(a)mail.gmail.com> Content-Type: text/plain; charset=UTF-8 On Tue, Sep 16, 2014 at 6:07 PM, Jeff Boyce <jboyce(a)meridianenv.com> wrote: > Greetings - > > I am preparing to order a new desktop system for work. In general the new > system will be a Dell Precision T3610 with two 3 TB drives. I plan on > installing CentOS 7 as a KVM host, with virtual machines for Win 7 Pro and > Linux Mint. I am looking for some advice or a good how-to on configuring > software raid on the two drives, then using LVM for the host and virtual > machines. I have configured our company server (Dell T610) with hardware > raid and LVM for a CentOS 6 KVM host and several virtual machines so I am > not a complete novice, but have never setup a Linux software raid system, > and have not played with a CentOS 7 install yet. I have been searching the > web and forums for information and am not finding much for good guidance. > Lots of gotcha's are popping up identifying issues related to CentOS 7, > software raid 1, grub install, > 2 TB disks (or any combination of these > factors). The CentOS Wiki has a good description of installing I'm not sure which wiki article you might have read. That URL might be worthwhile to share. ** The CentOS Wiki article I was referring to was the same one you provided in the first link of the group of references posted at the bottom of your note. I was a little put off by the article having fairly significant warnings in the first two paragraphs of the article, so I only skimmed through it. > CentOS 5 with raid 1, but there is a big warning about being an > unsupported (risky) approach. Can anyone point me to a good how-to, or > provide some general guidance. Thanks. > > Hopefully what I have typed up below helps you. I don't know about soft-raid1 being an unsupported/risky approach ... that said I'd pick hardware raid over software raid (considering I had spare hardware) so I don't have to fuss with raid at the OS level. I have worked on a mix of software-raid and hardware-raid systems (and still do) ... each has its own pros/cons. I've had success re-adding a new drive in degraded soft-raid1 arrays in a production environment ... so I say go for it. [ ] Somebody else asked about C7 and soft-raid in the past week or week and a half. You can find that thread here: http://lists.centos.org/pipermail/centos/2014-September/145656.html Though I don't think much was accomplished in that thread. [/] ** Yea, I saw that thread recently also, and was hoping for some good information from it, but the original post wasn't specific enough to generate specific guidance. That is why I thought to try a post that was more specific to my objective. My suggestion to you (as well as that last person) is to spin up a VM (or spare bare-metal hardware) and use mdadm commands to assemble, stop, hot-fail, hot-remove, and rebuild (add a new disk to replace a "failed one") your soft-raid array. ** I am planning on having some time set aside to play/experiment with the new box while setting it up. So I am fortunate to not be in a situation where I have to get it into production now before figuring it all out. As is the case with many things Linux, the manpage is your friend. Sometimes sysadmins and hobbyists decide to publish what they've done (good or bad) which can be found with the search engine of your choice. ** I am a book worm so I don't mind reading man pages. But as an ecologist, it is often good to understand the big picture before diving into the details. That way I understand which detail I need to look at, and what order all the details go together in. It looks like the ArchLinux links you gave me below will give me an understanding of that as I read them in detail. In this case, even generic (non-RH or non-CentOS specific) command documentation is likely what you want. More than likely you'll get the results you want by booting to a rescue CD (or switching to a shell on your install CD), setting up your soft-raid, then booting to your install CD, which will probe for your disk/soft-raid/lvm layout. steps for graphical approach (C5, so dated) - http://wiki.centos.org/HowTos/SoftwareRAIDonCentOS5 partitionable soft-raid - http://wiki.centos.org/HowTos/Install_On_Partitionable_RAID1 TLDP create soft-raid - http://www.tldp.org/HOWTO/Software-RAID-HOWTO.html ** I've seen these first three, and will go back and look at the first one in more detail now as mentioned above. Arch Linux create soft-raid - https://wiki.archlinux.org/index.php/Software_RAID_and_LVM ** I had not found this one. My first impression scanning through it is that it looks to have a lot of the other subjects I am interested in (mbr vs. gpt, XFS filesystem, EUFI vs BIOS mode). repairing - http://www.thomas-krenn.com/en/wiki/Mdadm_recovery_and_resync repairing - http://ethertubes.com/repair-md-mdadm-raid/ repairing - http://blog.laimbock.com/2014/04/01/how-to-replace-a-failed-disk-with-linux… ** Yes, thanks for these also. I am planning on outlining and testing my disaster recovery process when I set this up so I don't have to figure it out in a crisis when/if it happens. ** Thanks for your time. Jeff -- ---~~.~~--- Mike // SilverTip257 // Jeff Boyce www.meridianenv.com

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Zabbix on CentOS: system.users.num question
by 1th＠setevoy.kiev.ua 17 Sep '14

17 Sep '14

Hi. I have installed Zabbix 2.2.6 on CentOS 6.5. Question not too relative to CentOS, but hope somebody can help with it. All triggers works correctly, but venti:system.users.num.last(0)}>0 - dont't. Screenshot one: http://i.stack.imgur.com/YM9mu.png And second one: http://i.stack.imgur.com/TMNqx.png From manual https://www.zabbix.com/documentation/1.8/manual/config/items?s[]=system&s[]… we see, that: > Command who is used on agent side. who on box side: 14:29:44 [root@venti /tmp] # who setevoy pts/0 2014-09-15 14:15 (85.*.*.15) setevoy pts/1 2014-09-15 14:15 (:pts/0:S.0) ... # who | wc -l 11 Thus - system.users.num must be > 0 now. What I'm doing wrong?

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centos 5.10 has 2 DVDs?
by Tom Poe 17 Sep '14

17 Sep '14

Does the install of Centos5.10 prompt to insert disc2? What's on the second disc? Tom

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Centos 7: What happened to the caja extensions?
by Frank Cox 17 Sep '14

17 Sep '14

I just finished setting this computer up again from scratch since the hard drive died yesterday, and when reinstalling the software that was there before, I discovered that the following packages are not available: beesu caja-beesu caja-extensions-common caja-image-converter caja-open-terminal caja-sendto I'm pretty sure that these came from epel before, but they're now missing? -- MELVILLE THEATRE ~ Real D 3D Digital Cinema ~ www.melvilletheatre.com

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