Discuss December 2014

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164 participants
167 discussions

PXE install in a boot on san with LVM environment, fails after reboot
by Damien Gouju 27 Dec '14

27 Dec '14

Hello, I need to automate installation of CentOS 7.0 using PXE and kickstart. My server is diskless, I'm installing CentOS on a 25GB LUN on a FC SAN with 4 paths. This LUN is the only one accessible by the server. Anaconda processes successfully the installation. But on reboot, I get stuck on a prompt after BIOS. I think I have an issue with storage configuration / bootloader configuration... I can install it using the ISO, with basic configuration. The /root/anaconda-ks.cfg looks like the following (I striped some part, I cannot copy past because I have only console access through a secured VPN :-/ ): firstboot --enable ignoredisk --only-use=mpatha,sdc,sdd,sdb,sda bootloader --location=mbr --boot-drive=mpatha autopart --type=lvm clearpart --all --initlabel --drives=mpatha %packages @base @core %end My ks.cfg template is identical (I also cannot attach it unfortunately…). I tried several things like: - put sda as boot-drive for bootloader (according to http://osdir.com/ml/general/2014-09/msg52181.html ), but anaconda fails with error that this drive cannot be found. It asks to choose another disk, mpatha is the only available. - same with dm-0 (as /dev/mapper/mpatha is a symlink to /dev/dm-0) but anaconda also fails - add to bootloader « --append="rd.lvm.lv=centos/root rd.lvm.lv=centos/swap" » I also found some post on the web saying that in the « ignoredisk » mpatha mustn't be used but disk/by-id/scsi-XXXX (chapter 23.3.2 of RHEL 7 installation guide), but I don’t know how to manage that. Is someone ever did that kind of PXE installation, with boot on san & LVM, and help me in the kickstart configuration? Any help would be highly appreciated! Best regards, Damien

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Fail2ban mail failures ???
by Robert G. (Doc) Savage 27 Dec '14

27 Dec '14

I'm using fail2ban with CentOS 6.6. Something is causing fail2ban's alerts sent to root's mail to be rejected. Here's a clip from one of the error messages: Message 48: From MAILER-DAEMON(a)lion.protogeek.org Sun Dec 21 03:09:20 2014 Return-Path: <MAILER-DAEMON(a)lion.protogeek.org> Date: Sun, 21 Dec 2014 03:09:19 -0600 From: Mail Delivery Subsystem <MAILER-DAEMON(a)lion.protogeek.org> To: postmaster(a)lion.protogeek.org Content-Type: multipart/report; report-type=delivery-status; boundary="sBL97EKS003880.1419152959/lion.protogeek.org" Subject: Postmaster notify: see transcript for details Auto-Submitted: auto-generated (postmaster-notification) Status: R Part 1: The original message was received at Tue, 16 Dec 2014 03:09:17 -0600 from localhost with id sBG97E83025627 ----- The following addresses had permanent fatal errors ----- <fail2ban(a)example.com> ----- Transcript of session follows ----- <fail2ban(a)example.com>... Deferred: Connection timed out with example.com. Message could not be delivered for 5 days Message will be deleted from queue .......... I used to get the messages that are now being deleted after five days. Any suggestions? --Doc Savage Fairview Heights, IL

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CentOS 7 boot network problem
by Greg Lindahl 27 Dec '14

27 Dec '14

I rebooted a new CentOS 7 host and it attempted to start postfix and apache before the network came up. Needless to say both complained that they couldn't bind to the requested IP address and "entered the failed state." Did I miss an option somewhere? The network config is a manual one, and I see from the generated file in /etc/sysconfig/network-scripts that ONBOOT="yes"... -- greg

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(py)curl error 7
by Mateusz Guz 26 Dec '14

26 Dec '14

Hi, Disabled ipv6 (using sysctl, disabled ip6tables, no reboot, no proxy present) and still get the message as below. Centos 6.3 (i know its old) Kernel : 2.6.32-279.14.1.el6.x86_64 (I know its old) Standard /etc/yum.conf (no changes) Standard repos (centos base), enabled Cleaned cache: yum metadata (didn't work) Then: yum clean all (didn't work) Then yum makecache (didn't work) Yum repolist Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=os error was 14: PYCURL ERROR 7 - "Failed to connect to 2a02:2498:1:3d:5054:ff:fed3:e91a: Network is unreachable" Ping on mirrorlist.centos.org is OK Curl mirrrorlist.centos.org NOT_OK Message started to occur suddenly, I didn't even update any package. Any suggestions ?

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Emacs problem
by Jason Ricles 25 Dec '14

25 Dec '14

I am currently running the latest kept yum version of emacs on Centos 6.6. The issues I am having is that sometimes when I type input, some of the input randomly disappears and will then reappear when I highlight where the missing input should be. Why might this annoying thing be happening, and is there a way to fix it? Also I have not made any edits to emacs preferences so they are set to the defaults, and never happened in Centos 6.5 but now does in 6.6.

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WARNING: No module xenblk found for kernel
by Dave Stevens 23 Dec '14

23 Dec '14

ran routine updates on the lernel this morning and got this: WARNING: No module xenblk found for kernel 2.6.18-400.1.1.el5, continuing anyway The only references I can find are a year or so old. Anyone able to comment? or refer me? Have not rebooted. uname -a Linux bulkley.bvserver.ca 2.6.18-400.el5xen #1 SMP Thu Dec 4 13:29:23 EST 2014 x86_64 x86_64 x86_64 GNU/Linux Thanks, Dave -- "As long as politics is the shadow cast on society by big business, the attenuation of the shadow will not change the substance." -- John Dewey

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Upgrading glibc on CentOS 7 to fix memory leak
by Casey Jordan 23 Dec '14

23 Dec '14

Hi All, I am in a bit of a conundrum I hope someone could give me some advice. I have a CentOS 7 server which currently runs glibc version 2.17.x. That version contains a memory leak described and fixed here: https://sourceware.org/bugzilla/show_bug.cgi?id=17370 Suffice to say, this memory leak is causing some serious issues and I have read that upgrading glibc without also upgrading the entire kernel is not recommended. I was hoping that this fix was back ported into CentOS 7 somewhere and maybe there is a quick fix I just don't know about? This is a production server so stability is a big concern, I can't be trying out any new experimental stuff ;) Thanks everyone! <https://sourceware.org/bugzilla/show_bug.cgi?id=17370>-- -- Casey Jordan easyDITA a product of Jorsek LLC "CaseyDJordan" on LinkedIn, Twitter & Facebook (585) 348 7399 easydita.com This message is intended only for the use of the Addressee(s) and may contain information that is privileged, confidential, and/or exempt from disclosure under applicable law. If you are not the intended recipient, please be advised that any disclosure copying, distribution, or use of the information contained herein is prohibited. If you have received this communication in error, please destroy all copies of the message, whether in electronic or hard copy format, as well as attachments, and immediately contact the sender by replying to this e-mail or by phone. Thank you.

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openvpn client and KDE Network Manager - with CentOS7
by CS DBA 22 Dec '14

22 Dec '14

Hi All, I am switching from Fedora20 to CentOS7 since I now run all my Linux development in a VM and I get a more robust feature set (i.e. shared folders with the host that "just work", etc) The only issue I have thus far is VPN connections. Looking at what's installed on my old Fedora install I suspect I need these packages: kde-plasma-nm-vpnc kde-plasma-nm-openvpn NetworkManager-openvpn NetworkManager-vpnc However none of these are available in CentOS7, Note I have the centos extras and the EPEL repos enabled. I suspect that I need rpmfusion but I don't see that rpmfusion has a repo for CentOS7... Anyone have any thoughts? Can I simply install the centos6 rpmfusion repo? Thanks in advance

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yum upgrade not working
by Tim Dunphy 22 Dec '14

22 Dec '14

Hey all, I'm attempting to upgrade a Centos 5.9 machine to CentOS 5.10. But when I try the yum update command I get this response: --> Finished Dependency Resolution python26-PyYAML-3.08-5.el5.x86_64 from installed has depsolving problems --> Missing Dependency: libyaml-0.so.1()(64bit) is needed by package python26-PyYAML-3.08-5.el5.x86_64 (installed) --> Running transaction check ---> Package kernel.x86_64 0:2.6.18-164.15.1.el5.centos.plus set to be erased ---> Package kernel.x86_64 0:2.6.18-194.11.4.el5 set to be erased ---> Package kernel.x86_64 0:2.6.18-238.9.1.el5 set to be erased ---> Package kernel-devel.x86_64 0:2.6.18-308.4.1.el5 set to be erased --> Processing Dependency: libyaml-0.so.1()(64bit) for package: python26-PyYAML --> Finished Dependency Resolution python26-PyYAML-3.08-5.el5.x86_64 from installed has depsolving problems --> Missing Dependency: libyaml-0.so.1()(64bit) is needed by package python26-PyYAML-3.08-5.el5.x86_64 (installed) Error: Missing Dependency: libyaml-0.so.1()(64bit) is needed by package python26-PyYAML-3.08-5.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 The system claims that it can't find libyaml-0.so.1, however I can easily locate it: [root@ops:~] #locate libyaml-0.so.1 /usr/lib64/libyaml-0.so.1 /usr/lib64/libyaml-0.so.1.1.0 Can someone please point me in the right direction for solving these problems? Thanks Tim -- GPG me!! gpg --keyserver pool.sks-keyservers.net --recv-keys F186197B

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Re: [CentOS] CentOS Digest, Vol 119, Issue 19
by Xinhuan Zheng 22 Dec '14

22 Dec '14

Hello Brian, >GPG is really what you want to be using for this. OpenSSL is a general >toolkit that provide a lot of good functions, but you need to cobble some >things together yourself. GPG is meant to handle all of the other parts >of >dealing with files. >I will expand on what someone else mentioned -- asymmetric encryption is >not meant for, and has very poor performance for encrypting data, and also >has a lot of limitations. The correct way to handle this is to create a >symmetric key and use that to encrypt the data, then use asymmetric >encryption to encrypt only the symmetric key. >GPG takes care of this all internally, so that's what you should be using. Do you have any resources that show examples of how to use GPG internally that takes care of symmetric/asymmetric encryption? Thanks, - xinhuan

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Discuss December 2014