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34745 discussions

Solarflare SFC9000 direct connection
by lejeczek 10 Jul '18

10 Jul '18

hi guys I wonder if any of you might be using SFN6122F-R7 SFP+ (SFC9000, same firmware everywhere, Centos 7.5 too. I'm trying poor man's setup to get the servers onto 10GbE network. Setup is such that three Dell R815 are connected to each other, each has one Solarflare(SFP ports) and each Solarflare is set as net-team(both ports on a card are net-team device) with runner in broadcast mode. And it all seems to work, they ping each other, iperf okey. The problem, big problem is that when traffic start to flow between all three servers simultaneously, with rsync for example, then!! one box gets shoot in the head, hard reset, gone. Every time same one box. Sure there are some bits that run on that one box that are not on the other two. Now, I know you would normally put it via a switch, but like I said: poor man's config, but you would not expect system to die like this neither, right? many thanks, L.

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shellinabox
by lejeczek 10 Jul '18

10 Jul '18

hi guys, shellinabox, do you use it? I in pretty vanilla setup get selinux denials and cannot login. Selinux says: #============= unconfined_service_t ============== #!!!! The file '/usr/bin/bash' is mislabeled on your system. #!!!! Fix with $ restorecon -R -v /usr/bin/bash allow unconfined_service_t unconfined_t:process transition; but that does not seem right to me, to allow such a transition, right? many thanks, L.

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CentOS 7 + MATE : no sound in Firefox
by Nicolas Kovacs 08 Jul '18

08 Jul '18

Hi, I recently switched my main workstation running CentOS 7 from KDE to MATE. Migration went well, but now I have a couple issues. First things first. I have no sound in the Firefox browser. Applications like Audacious, VLC or MPlayer have sound, but Firefox is mute. Any idea how I can fix that? Cheers, Niki -- Microlinux - Solutions informatiques durables 7, place de l'église - 30730 Montpezat Site : https://www.microlinux.fr Blog : https://blog.microlinux.fr Mail : info(a)microlinux.fr Tél. : 04 66 63 10 32

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two 2-node clusters or one 4-node cluster?
by Gianluca Cecchi 07 Jul '18

07 Jul '18

Hello, I'm planning migration of current two clusters based on CentOS 6.x with Cman/Rgmanager going to CentOS 7.x and Corosync/Pacemaker. As the clusters and their services are on the same subnet, and there no particular security concerns differentiating them, I'm also evaluating the option to transform the two clusters into a unique 4-node one during the upgrade. Currently I'm testing a virtual 4-node CentOS 7.4 cluster inside oVirt 4.2 and things seem to behave well. Before going further in deep with tests and so on, I'd like to check with the community about how many CentOS 7.x clusters composed by more than two nodes are in place and what are the feedbacks on them in terms of incremented latency/communication, ecc scaling out. Also general feedback related to CentOS 6 and scalability of cluster nodes number is welcome. Thanks in advance, Gianluca

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Redirect output from python script with systemd
by C. L. Martinez 07 Jul '18

07 Jul '18

Hi all, I need to redirect an output from python script that runs as a systemd service. I have tried to redirect its output in Exec statement without luck. I have tried to use StandardOutput and StandardError options also, but outpu log goes to /var/log/messages. Any tip? Thanks. -- Greetings, C. L. Martinez

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Bash question
by Jerry Geis 07 Jul '18

07 Jul '18

Hi All, I am trying to build a command line with spaces in the argument. This demonstrates what I am trying to do. Clearly the first two commands work fine. However, the last 4 lines to not. /opt/libreoffice5.4/program/soffice.bin --headless --convert-to csv "/tmp/file.xlsx" /opt/libreoffice5.4/program/soffice.bin --headless --convert-to csv "/tmp/file 2.xlsx" MSG="file 2" MSG="csv \"$MSG\"" echo $MSG /opt/libreoffice5.4/program/soffice.bin --headless --convert-to $MSG I am trying to make a variable containing spaces which is MSG. Then add to that variable the argument csv. The "echo" above prints the write stuff. But when I try to use it in the last command its no longer valid and says Source file could not be loaded. What am I missing? much searching hinted to arrays and using \$ but I could not get that to work. Thanks. Jerry

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Any Word On Updates For Security FIx For Firefox?
by Paul E. Virgo 05 Jul '18

05 Jul '18

Just checking to see if we're either getting a Firefox 52.9 or Firefox 60.x for CentOS 6 to address the latest security fix. -- Paul E Virgo Sr. System Administrator Code 610.2 SESDA III - DAAC/DISC Goddard Space Flight Ctr/NASA Greenbelt, MD Greenbelt, MD 20771 (301) 614-5751

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weird slowdowns with recent CentOS 6 update
by Noam Bernstein 05 Jul '18

05 Jul '18

I just spent a while trying to debug some weird slowdown issues, and I thought I’d let the mailing list know in case it helps anyone else, or someone has a cleaner solution (or better ways of debugging the real issue). Just by way of context, we have a cluster using Infiniband and CentOS 6 (up to the latest patches as of a couple weeks ago, so 6.9+anything newer) and OpenMPI 3.1.0. Most of the nodes are "Intel(R) Xeon(R) CPU E5-2670 0 @ 2.60GHz” or "Intel(R) Xeon(R) CPU E5-2630 v3 @ 2.40GHz”, currently with kernel .6.32-696.30.1.el6.x86_64 Recently (I believe when we upgraded to that kernel, but not 100% sure that's really when it started), certain parallel floating-point-compute intensive jobs would sometimes (maybe 1 time in 20) run very slowly. The overall speed was reduced by about a factor of 2, but the slowdown appeared to be localized to specific routines, which would go from taking ~1s to ~50-100s. I first assumed it had to do with communication, but as I made the timing information more fine grained, it became clear that nearly trivial loops like DO I=1,GRIDC%RL%NP DWORK1(I,ISP)= REAL( DWORK(I,ISP) ,KIND=q) ENDDO were a large part of the problem. The only thing I could find after poking around that was at all odd is that when this happened, khugepaged would be taking 100% of cpu for tens of seconds on the affected nodes. It appears, although it’s not completely certain yet (since the problem appears rarely enough to that it’s hard to definitively rule out), that disabling THP by putting “never” in /sys/kernel/mm/transparent_hugepage/enabled and /sys/kernel/mm/transparent_hugepage/defrag fixes the problem. I guess I am also still wondering what exactly khugepaged does, and what kind of problems I should worry about because I disabled it. The documentation I’ve found for it doesn’t really explain what the transparent huge pages are good for. Noam

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Re: [CentOS] Firefox 60.0.1.0 ESR Progress?
by Sean 05 Jul '18

05 Jul '18

Mr. Hughes, Thank very much for the update! That's the kind of info I was looking for, if an ETA isn't reasonable to ask for. I can report a summary of your note to my upstream authorities. I support both SL7 and C7 workstations, but had not yet seen the update on the sl-devel list. I appreciate you taking the time to answer this thread! Thanks for your hard work! From: Johnny Hughes <johnny(a)centos.org> To: centos(a)centos.org Cc: Bcc: Date: Thu, 5 Jul 2018 06:16:14 -0500 Subject: Re: [CentOS] Firefox 60.0.1.0 ESR Progress? On 07/03/2018 09:04 AM, Sean wrote: > Thanks for the idea, I'm not in a hurry and don't have a desire to > hand-jam upstream versions of firefox onto desktops. I just need to > track progress on the patch release and report an ETA to our cyber > security team. > > I just figured CentOS had a fancy devops CI/CD system somewhere that I > could keep tabs on to watch what's going on as patches get built, > tested and published. Seems like all the cool kids are doing that > kind of stuff these days. > > OK guys .. Firefox 60 is going to take some time .. likely more for CentOS-6 than CentOS-7. They both (C6 and C7 versions) require many non OS tools to build. For CentOS-7 .. we need the rust-toolset, llvm-toolset, and devtoolset-7, to get the firefox to build. For CentOS-6, we need less items (no llvm-toolset required .. all the rest is required). But, there is no released source code for the EL6 version of rust-devtoolset upstream. I am working on this now .. but we had the 6.10 release and the also 32 other items that dropped for CentOS-7 (both of which are now done). I am not the only one having issues with Firefox-60 (see this thread on the Scientific Linux list): https://listserv.fnal.gov/scripts/wa.exe?A2=ind1807&L=scientific-linux-deve… I hope to have this working soon .. but. it is not just a build and release kind of package. Thanks, Johnny Hughes

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upgrade 7.4 --> 7.5: dbus broken
by Harald Dunkel 05 Jul '18

05 Jul '18

Hi folks, after upgrading a Centos container (LXC) from 7.4 to 7.5 I got this: # systemctl status Failed to get D-Bus connection: Connection refused # busctl Failed to connect to bus: Connection refused # ps -ef | grep db[u]s dbus 55 1 0 Jul02 ? 00:00:00 /usr/bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation # lsof -p 55 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME dbus-daem 55 dbus cwd DIR 8,4 4096 130819 / dbus-daem 55 dbus rtd DIR 8,4 4096 130819 / dbus-daem 55 dbus txt REG 8,4 223344 133569 /usr/bin/dbus-daemon dbus-daem 55 dbus DEL REG 8,4 393485 /var/lib/sss/mc/initgroups dbus-daem 55 dbus mem REG 8,4 37240 150982 /usr/lib64/libnss_sss.so.2 dbus-daem 55 dbus mem REG 8,4 62184 150786 /usr/lib64/libnss_files-2.17.so dbus-daem 55 dbus mem REG 8,4 68192 141459 /usr/lib64/libbz2.so.1.0.6 dbus-daem 55 dbus mem REG 8,4 90664 140578 /usr/lib64/libz.so.1.2.7 dbus-daem 55 dbus mem REG 8,4 99944 150835 /usr/lib64/libelf-0.170.so dbus-daem 55 dbus mem REG 8,4 19896 140110 /usr/lib64/libattr.so.1.1.0 dbus-daem 55 dbus mem REG 8,4 402384 132708 /usr/lib64/libpcre.so.1.2.0 dbus-daem 55 dbus mem REG 8,4 88776 150757 /usr/lib64/libgcc_s-4.8.5-20150702.so.1 dbus-daem 55 dbus mem REG 8,4 19776 150776 /usr/lib64/libdl-2.17.so dbus-daem 55 dbus mem REG 8,4 297360 151443 /usr/lib64/libdw-0.170.so dbus-daem 55 dbus mem REG 8,4 106848 150792 /usr/lib64/libresolv-2.17.so dbus-daem 55 dbus mem REG 8,4 19384 141564 /usr/lib64/libgpg-error.so.0.10.0 dbus-daem 55 dbus mem REG 8,4 535064 141290 /usr/lib64/libgcrypt.so.11.8.2 dbus-daem 55 dbus mem REG 8,4 85952 150956 /usr/lib64/liblz4.so.1.7.5 dbus-daem 55 dbus mem REG 8,4 157424 140323 /usr/lib64/liblzma.so.5.2.2 dbus-daem 55 dbus mem REG 8,4 44448 150794 /usr/lib64/librt-2.17.so dbus-daem 55 dbus mem REG 8,4 1139680 150778 /usr/lib64/libm-2.17.so dbus-daem 55 dbus mem REG 8,4 20032 140130 /usr/lib64/libcap.so.2.22 dbus-daem 55 dbus mem REG 8,4 2173512 146385 /usr/lib64/libc-2.17.so dbus-daem 55 dbus mem REG 8,4 144792 144798 /usr/lib64/libpthread-2.17.so dbus-daem 55 dbus mem REG 8,4 23968 141464 /usr/lib64/libcap-ng.so.0.0.0 dbus-daem 55 dbus mem REG 8,4 127096 146315 /usr/lib64/libaudit.so.1.0.0 dbus-daem 55 dbus mem REG 8,4 155784 150814 /usr/lib64/libselinux.so.1 dbus-daem 55 dbus mem REG 8,4 173320 140201 /usr/lib64/libexpat.so.1.6.0 dbus-daem 55 dbus mem REG 8,4 203800 151456 /usr/lib64/libsystemd.so.0.6.0 dbus-daem 55 dbus mem REG 8,4 333408 144514 /usr/lib64/libdbus-1.so.3.14.14 dbus-daem 55 dbus mem REG 8,4 164240 150767 /usr/lib64/ld-2.17.so dbus-daem 55 dbus 0u CHR 1,3 0t0 129677343 /dev/null dbus-daem 55 dbus 1u unix 0xffff8f56b7b2cc00 0t0 129677608 socket dbus-daem 55 dbus 2u unix 0xffff8f56b7b2cc00 0t0 129677608 socket dbus-daem 55 dbus 3u unix 0xffff8f56bbbb3800 0t0 129676115 /run/dbus/system_bus_socket dbus-daem 55 dbus 4u a_inode 0,11 0 8547 [eventpoll] dbus-daem 55 dbus 5r REG 8,4 10406312 393485 /var/lib/sss/mc/initgroups (deleted) dbus-daem 55 dbus 6u sock 0,8 0t0 129677256 protocol: NETLINK dbus-daem 55 dbus 7r a_inode 0,11 0 8547 inotify dbus-daem 55 dbus 8u unix 0xffff8f56b80c4c00 0t0 129677257 socket dbus-daem 55 dbus 9u unix 0xffff8f56ba3aec00 0t0 129677258 socket dbus-daem 55 dbus 10u unix 0xffff8f56b7681000 0t0 129681025 /run/dbus/system_bus_socket Please note the "/run/dbus/system_bus_socket". AFAICT thats new. Shouldn't it listen on /var/run/dbus/system_bus_socket for backward compatibility as well? Is there is a way to fix this? Every helpful comment is highly appreciated. Harri

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