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RHEL changes
by J Martin Rushton 26 Jan '21

26 Jan '21

See: https://arstechnica.com/gadgets/2021/01/centos-is-gone-but-rhel-is-now-free… and https://www.redhat.com/en/blog/new-year-new-red-hat-enterprise-linux-progra… -- J Martin Rushton MBCS

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CentOS Dojo @FOSDEM, Next Week
by Rich Bowen 26 Jan '21

26 Jan '21

Reminder: we will be holding our annual FOSDEM CentOS Dojo next week on Thursday and Friday. It will of course be online. Details, schedule, and registration, are available at https://wiki.centos.org/Events/Dojo/FOSDEM2021 Registration is free. Please come, and tel your colleagues!

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CentOS Stream suitability as a production webserver
by Jamie Burchell 25 Jan '21

25 Jan '21

Hello I've recently discovered the announcement regarding the change in direction for the CentOS project and I imagine like many others, I'm confused and concerned about what this means moving forward. I work for a small web development agency and we offer hosting as part of our package to clients who need it. We have many CentOS 7 web servers (DigitalOcean droplets) (LAMP/LEMP) that I look after and today I'm thankful I have only migrated one of those to CentOS 8, given the recent announcement about its curtailed EOL. I literally just went to the Wiki today to confirm the EOL date for EL7 and boy am I glad I spotted it. Given we are not developing drivers or applications (other than websites and web applications), is the change a non-issue for my use-case? I've seen it written that CentOS Stream is the "development version" of RHEL but also that we shouldn't have considered RHEL to be the beta for CentOS. Others have said to think of CentOS more like RHEL RC-1. I just don't know how the stability will compare and we have historically always chosen CentOS for its stability (and of course price). Sure, I could migrate to Ubuntu (I use this locally in WSL), but I've become somewhat "comfy slippers" with CentOS and have built our setup around it (including custom ansible scripts etc) and don't want to change everything unncessarily. Of course, a lot of this is somewhat dependent on what DigitalOcean will decide to provide image wise moving forward. I'm sorry if this has already been answered, I spent a good few hours reading through the respective threads in the devel list and ended up more confused than I started. Cheers, Jamie

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Infiniband special ops?
by lejeczek 25 Jan '21

25 Jan '21

Hi guys. Hoping some net experts my stumble upon this message, I have an IPoIB direct host to host connection and: -> $ ethtool ib1 Settings for ib1: Supported ports: [ ] Supported link modes: Not reported Supported pause frame use: No Supports auto-negotiation: No Supported FEC modes: Not reported Advertised link modes: Not reported Advertised pause frame use: No Advertised auto-negotiation: No Advertised FEC modes: Not reported Speed: 40000Mb/s Duplex: Full Auto-negotiation: on Port: Other PHYAD: 255 Transceiver: internal Link detected: yes and that's both ends, both hosts, yet: > $ iperf3 -c 10.5.5.97 Connecting to host 10.5.5.97, port 5201 [ 5] local 10.5.5.49 port 56874 connected to 10.5.5.97 port 5201 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 1.36 GBytes 11.6 Gbits/sec 0 2.50 MBytes [ 5] 1.00-2.00 sec 1.87 GBytes 16.0 Gbits/sec 0 2.50 MBytes [ 5] 2.00-3.00 sec 1.84 GBytes 15.8 Gbits/sec 0 2.50 MBytes [ 5] 3.00-4.00 sec 1.83 GBytes 15.7 Gbits/sec 0 2.50 MBytes [ 5] 4.00-5.00 sec 1.61 GBytes 13.9 Gbits/sec 0 2.50 MBytes [ 5] 5.00-6.00 sec 1.60 GBytes 13.8 Gbits/sec 0 2.50 MBytes [ 5] 6.00-7.00 sec 1.56 GBytes 13.4 Gbits/sec 0 2.50 MBytes [ 5] 7.00-8.00 sec 1.52 GBytes 13.1 Gbits/sec 0 2.50 MBytes [ 5] 8.00-9.00 sec 1.52 GBytes 13.1 Gbits/sec 0 2.50 MBytes [ 5] 9.00-10.00 sec 1.52 GBytes 13.1 Gbits/sec 0 2.50 MBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-10.00 sec 16.2 GBytes 13.9 Gbits/sec 0 sender [ 5] 0.00-10.00 sec 16.2 GBytes 13.9 Gbits/sec receiver It's rather an oldish platform which hosts the link, PCIe is only 2.0 but with link of x8 that should be able to carry more than ~13Gbits/sec. Infiniband is Mellanox's ConnectX-3. Any thoughts on how to track the bottleneck or any thoughts I'll appreciate much. thanks, L

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simple http server grab data posted and send to another server - slightly off topic
by Jerry Geis 22 Jan '21

22 Jan '21

Hi All, anyone know how to make a "simple" http server (python -m SimpleHTTPServer 8000) type of stuff - but simply take the incoming data, (should be real small) and when received - send that to a different server . This is different than "redirect" as that is the issue. The device does not understand the redirect response that is happening now. So I was looking for a way to "consume" the post - then re-send the post. It has to be independent of httpd as that is in use. CentOS 7 is my platform. Thanks Jerry

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KVM support on RT Kernerl
by Danishka Navin 21 Jan '21

21 Jan '21

Hi, I have deployed CentOS 7.6 and then installed RT kernel. Later KVM installed on the same box. I noticed that KVM module was not loaded and then switched to the generic kernel. KVM module was loaded in the generic kernel. Is this a known issue? I would like to use KVM with RT kernel. Regards, -- Danishka Navin

1 0

Compiling Qt applications in docker
by H 21 Jan '21

21 Jan '21

I am working on compiling an application using Qt and am a newbie. I already have Qt on my CentOS 7 system but this application requires a later version of Qt not available for C 7. It also requires postgreSQL libraries and I am using the latest version of that, ie pgsql 13. I have successfully compiled it in a docker environment and I can launch it on the desktop. I have, however, not tested it against postgreSQL on my computer - yet. I do not want to run it in docker though but on my "regular" computer outside docker, as well as be able to move it to other computers I have. I am only using docker as a sandbox while working on compiling etc. I am not sure how I should set it up - outside docker - so that the Qt libraries it needs do not foul up the rest of my system but are only seen by this particular application. Can anyone offer a suggestion? Should the compiled application eventually reside in its own directory under /usr/local/bin and where should the Qt libraries be? In the same directory as the app? If not, where should they be placed? I tried to compile it to use the Qt libraries statically linked but the app does not run that way in docker but crashes with a segmentation fault. Suggestions/best practices appreciated!

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mcelog service error flagged in Cockpit
by Robert G. (Doc) Savage 20 Jan '21

20 Jan '21

Whenever I log into Cockpit, it flags mcelog as a service failure-to- start failure. systemctl confirms this. # systemctl status mcelog * mcelog.service - Machine Check Exception Logging Daemon Loaded: loaded (/usr/lib/systemd/system/mcelog.service; disabled; vendor preset: enabled) Active: failed (Result: exit-code) since Sun 2021-01-10 18:06:36 CST; 1 weeks 2 days ago Main PID: 21959 (code=exited, status=1/FAILURE) Jan 10 18:06:36 lionstore.protogeek.org systemd[1]: Started Machine Check Exception Logging Daemon. Jan 10 18:06:36 lionstore.protogeek.org mcelog[21959]: mcelog: ERROR: AMD Processor family 23: mcelog does not support this processor. Please use the edac_mce_amd module instead. Jan 10 18:06:36 lionstore.protogeek.org mcelog[21959]: CPU is unsupported Jan 10 18:06:36 lionstore.protogeek.org systemd[1]: mcelog.service: Main process exited, code=exited, status=1/> Jan 10 18:06:36 lionstore.protogeek.org systemd[1]: mcelog.service: Failed with result 'exit-code'. A search through BZ indicates mcelog hasn't been supported on AMD processors s since family 21. How do I tell Cockpit to use this alternative module? Perhaps more importantly, why doesn't Cockpit automatically set up this module when it's installed on an AMD system? --Doc Savage Fairview Heights, IL

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btrfs to ext4
by Christopher Wensink 19 Jan '21

19 Jan '21

Hello CentOS Gurus, I have just learned that our backup system natively supports restoring vmware VM individual files from a vmware based backup for ext3,ext4 file systems but not BTRFS and some of our VM's run BTRFS as the root file system. Does anyone know if it's possible to convert BTRFS partitions to ext4? Chris -- Christopher Wensink IS Administrator Five Star Plastics, Inc 1339 Continental Drive Eau Claire, WI 54701 Office: 715-831-1682 Mobile: 715-563-3112 Fax: 715-831-6075 cwensink(a)five-star-plastics.com www.five-star-plastics.com

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Restore pristine SELinux configuration ?
by Nicolas Kovacs 19 Jan '21

19 Jan '21

Hi, I have CentOS 7 running on a public server hosting all sorts of web applications, mail, XMPP, MPD, etc. How do I reset SELinux configuration to defaults? I know how to reset all my custom booleans to the initial state. # cat /etc/selinux/targeted/active/booleans.local # This file is auto-generated by libsemanage # Do not edit directly. httpd_unified=1 httpd_can_sendmail=1 spamd_enable_home_dirs=1 httpd_can_network_connect=1 ftpd_full_access=1 mpd_enable_homedirs=1 named_write_master_zones=1 Starting from there, I can manually reset them to 0 with setsebool. On the other hand, I don't know how I would do something similar with the SELinux modules. I vaguely remember having created some of these, for example for Fail2ban to work correctly. But I don't remember what I did here over the years, what modules I created, etc. How would I recreate the default SELinux configuration without having to wipe and reinstall the whole server? 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 Mob. : 06 51 80 12 12

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