Discuss May 2016

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155 participants
149 discussions

Re: [CentOS] Kernel 2.6.32-573.22.1.el6.x86_64, higher than usual load
by Laura Herrmann 12 May '16

12 May '16

I did a batch update on a number of Xen vservers, with kernel 2.6.32-573.26.1 being installed. In addition to load averages being high and these #s not being reflected by the individual CPU numbers within top, I now have a spattering of occasional daemon crashes that the vservers have historically never had. Such as, here is the start of a nameserver blowing up in my logs: May 12 04:03:41 XXX kernel: named invoked oom-killer: gfp_mask=0x201da, order=0, oom_adj=0, oom_score_adj=0 : # May 12 04:03:41 XXX kernel: named cpuset=/ mems_allowed=0 : # May 12 04:03:41 XXX kernel: Pid: 2208, comm: named Not tainted 2.6.32-573.26.1.el6.x86_64 #1 : # May 12 04:03:41 XXX kernel: Call Trace: : # This nameserver has never had a problem with its memory. And, there is another daemon on a different vserver that has done it twice, with the same sort of OOM thing. And.. what kind of sense does this make. top - 17:48:53 up 2 days, 9:10, 2 users, load average: 0.47, 0.29, 0.24 Tasks: 95 total, 1 running, 93 sleeping, 0 stopped, 1 zombie Cpu0 : 0.3%us, 0.7%sy, 0.0%ni, 96.7%id, 2.3%wa, 0.0%hi, 0.0%si, 0.0%st Cpu1 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st There's some problem here, at least because of the crashing out of nowhere on formerly-fine daemons. I'll be reverting all my kernels back to 2.6.32-573.18.1.

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Reduce existing CentOS 7 installation to "Minimal install" - services?
by Nicolas Kovacs 12 May '16

12 May '16

Hi, When I install a CentOS server/desktop/workstation, I usually start from scratch with a barebone minimal installation, then add packages as needed. Some machines (like dedicated servers in a datacenter) come preconfigured by the hosting company, so I thought it wouldn't be a bad idea to start stripping that stuff first. Here's a little script I wrote, which essentially strips down any CentOS-7 installation to a minimal core system: https://github.com/kikinovak/centos/blob/master/7.x/scripts/00-elaguer-paqu… The script parses the 'minimal' package list and then just removes everything that's not on the list. Now I tried running that on an existing CentOS-7 "Web Server" installation. I ran it, rebooted... and I got dropped to a console that suggested to run journalctl. Uh oh. I'm currently catching up with systemd and its specificities, working through a bunch of online tutorials. But here's what I figured out so far. Before stripping down my system, I have to reduce services to a minimum. (On a Slackware system, which is what I'm using most of the time, that's where I would disable pretty much all services besides rc.syslog and rc.sshd.) Now what would be the simple systemd equivalent of doing that? E. g. on any CentOS installation (be it graphical, "Web Server", "File Server", whatever), strip down services to the status that they're at just after installing a "Minimal Install"? Cheers from the sunny South of France, Niki -- Microlinux - Solutions informatiques durables 7, place de l'église - 30730 Montpezat Web : http://www.microlinux.fr Mail : info(a)microlinux.fr Tél. : 04 66 63 10 32

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Official Docker images and security updates
by Giovanni Tirloni 12 May '16

12 May '16

Hello, It seems the official Docker images are missing some important security updates [1][2]. Does anyone have any insight in how these packages get built and when? Their Dockerfile seems to come from here: https://github.com/docker-library/official-images/blob/master/library/centos (commit for "latest" says "update CentOS-7 - 20160331 - monthly build"). In the official Docker documentation [2] they suggest not running `apt-get upgrade` which I understood as don't run `yum -y upgrade` for CentOS. Any advice on whether it's best practice to always update packages or not? Thank you, Giovanni 1 - http://pastie.org/pastes/10833370/text 2 - https://blog.docker.com/2016/05/docker-security-scanning/ 3 - https://docs.docker.com/engine/userguide/eng-image/dockerfile_best-practice…

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openssl Security Update for CentOS 6.7 ETA
by Patrick Rael 11 May '16

11 May '16

Hi, Is there an ETA on the openssl security update (CVE-2016-0799) for CentOS 6.7? I saw the openssl update for CentOS 7 on 5/9, eagerly awaiting the same for 6.7. Thanks! -->Pat

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Upgrade path from CentOS 7 to future versions
by Venkateswara Rao Dokku 11 May '16

11 May '16

Hi, I would like to know whether the valid upgrade path will be present from CentOS 7 to future versions like we get for Ubuntu or some other operating systems. Right now, I am sure that we do not have proper update path in CentOS to move from one version to another. -- Thanks & Regards, Venkateswara Rao Dokku.

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OT: Linksys router misbehaviour
by Timothy Murphy 11 May '16

11 May '16

I'm running a Linksys WRT54GL router from my CentOS-7 home server. Every now and then (maybe once every 2 days) the router's WiFi cuts out, and I've found no way to solve this except to disconnect the power from the router, wait 10 seconds and then re-connect. This always works. The router is running under dd-wrt. My question is - which makes it a tiny bit CentOS-related - does anyone with such a router know of a way to wake the router up in such a case through the computer? I wouldn't have dared to ask this question here or anywhere until recently, as I assumed my ancient Linksys routers were obsolete. But I've been reading posts recently saying that there hasn't really been a Linux router to replace the WRT54GL, and in particular Linksys's recent 11n replacement is not as good as the old model in many ways. Anyway, if anyone has an answer to my query I would be very grateful. I have a couple of IP cameras working by WiFi on the computer, which I can look at remotely. I've connected one by TP-Link through the router, and this doesn't cut out, but it is not wholly satisfactory. -- Timothy Murphy gayleard /at/ eircom.net School of Mathematics, Trinity College, Dublin

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Cannot figure out what this segfault message means. Please help!
by Sean Son 11 May '16

11 May '16

Hello all I installed MySQL 5.7 using the Mysql community YUM repository and I also installed Tomcat 8 from tomcat.apache.org. The installations went fine but ive been noticing that the VM,which is running CentOS 7.2, has been freezing periodically. This morning when I checked the VM i saw the following segfault message: kernel:systemd[1]: segfault at ffffffffffffffff ip ffffffffffffffff sp 00007ffde89aa040 error 15 and kernel:systemd[1]: segfault at fffffffffffffe0f ip 00007f96bdd021ad sp 00007ffde89a8370 error 5 in systemd[7f96bdc2a000+146000] how do I interpret these error messages and are there any bug fixes out there for these errors? I am using kernel: 3.10.0-327.13.1.el7.x86_64. The VM is running on Hyper-V 2012. Thank you for all of your help!

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Re: [CentOS] CentOS 6 as DNS-Server
by Александр Кириллов 11 May '16

11 May '16

> how can I influence the time between the .jnl file is created/updated > and the zone file is updated? > more than 10 minutes is quite a bit long ... AFAIK rndc freeze/thaw <zone> will do that but you may try other rndc commands too.

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CentOS-announce Digest, Vol 135, Issue 5
by centos-announce-request＠centos.org 11 May '16

11 May '16

Send CentOS-announce mailing list submissions to centos-announce(a)centos.org To subscribe or unsubscribe via the World Wide Web, visit https://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. CEBA-2016:1008 CentOS 5 sos BugFix Update (Johnny Hughes) 2. CEBA-2016:1009 CentOS 5 firefox BugFix Update (Johnny Hughes) ---------------------------------------------------------------------- Message: 1 Date: Wed, 11 May 2016 05:00:22 +0000 From: Johnny Hughes <johnny(a)centos.org> To: centos-announce(a)centos.org Subject: [CentOS-announce] CEBA-2016:1008 CentOS 5 sos BugFix Update Message-ID: <20160511050022.GA13850(a)chakra.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Bugfix Advisory 2016:1008 Upstream details at : https://rhn.redhat.com/errata/RHBA-2016-1008.html The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) i386: a475b5d668e11fdedb198fce3b0c7acb44fc6792cfe2b476582827c10235bfde sos-1.7-9.74.el5.centos.noarch.rpm x86_64: a475b5d668e11fdedb198fce3b0c7acb44fc6792cfe2b476582827c10235bfde sos-1.7-9.74.el5.centos.noarch.rpm Source: a241963fe6488483dc6c0f6bd811a1a6e7eb9ab44683430341aa439855fa52be sos-1.7-9.74.el5.centos.src.rpm -- Johnny Hughes CentOS Project { http://www.centos.org/ } irc: hughesjr, #centos(a)irc.freenode.net Twitter: JohnnyCentOS ------------------------------ Message: 2 Date: Wed, 11 May 2016 05:08:38 +0000 From: Johnny Hughes <johnny(a)centos.org> To: centos-announce(a)centos.org Subject: [CentOS-announce] CEBA-2016:1009 CentOS 5 firefox BugFix Update Message-ID: <20160511050838.GA14020(a)chakra.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Bugfix Advisory 2016:1009 Upstream details at : https://rhn.redhat.com/errata/RHBA-2016-1009.html The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) i386: 8a1b5a12cc396b85b2bb8022acc81358366d4a24b6d819ad887478f4b3aad972 firefox-45.1.1-1.el5.centos.i386.rpm x86_64: 8a1b5a12cc396b85b2bb8022acc81358366d4a24b6d819ad887478f4b3aad972 firefox-45.1.1-1.el5.centos.i386.rpm 7cc5b5f1ba36683f7f8b2c04ffaf7151aec3212356d708a852c531b42b6dcf3a firefox-45.1.1-1.el5.centos.x86_64.rpm Source: 2d374e8d6925993a0c43346ab99b73ab7265e334326237318249adacbdade2c4 firefox-45.1.1-1.el5.centos.src.rpm -- Johnny Hughes CentOS Project { http://www.centos.org/ } irc: hughesjr, #centos(a)irc.freenode.net Twitter: JohnnyCentOS ------------------------------ _______________________________________________ CentOS-announce mailing list CentOS-announce(a)centos.org https://lists.centos.org/mailman/listinfo/centos-announce End of CentOS-announce Digest, Vol 135, Issue 5 ***********************************************

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Re: [CentOS] Badlock bad luck
by Bill Baird 11 May '16

11 May '16

I'm seeing the exact same behavior in my environment (NT4 PDC, not AD). I had to downgrade samba get systems working again. The full error message is: "The trust relationship between this workstation and the primary domain failed". Did you have any luck finding a solution?

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Discuss May 2016