Discuss December 2020

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157 participants
96 discussions

Software raid Oddity
by Paul R. Ganci 16 Dec '20

16 Dec '20

I have a CentOS 7.9 system with a software raid 6 root partition. Today something very strange occurred. At 6:45AM the system crashed. I rebooted and when the system came up I had multiple emails indicating that 3 out of 6 drives had failed on the root partition. Strangely I was able to boot into the system and everything was working correctly despite > cat /proc/mdstat also indicating 3 out of 6 drives had failed. Since the system was up and running despite the fact more than 2 drives had failed in the root raid array I decided to reboot the system. Actually I shut it down, waited for the drives to spin down and then restarted. This time when it came back the 3 missing drives were back in the array and a cat /proc/mdstat indicated all 6 drives were again in the raid 6 array. So a few questions: 1.) If 3 our of 6 drives of a raid 6 array supposedly fail, how does the array still function? 2.) Why would a shutdown/restart sequence supposedly fix the array? 3.) My gut suggests that the raid array was never degraded and that my system (i.e. cat /proc/mdstat) was lying to me. Any Opinions? Has anybody else ever seen such strange behavior? -- Paul (ganci(a)nurdog.com) Cell: (303)257-5208

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What are the differences between CentOS Linux and CentOS Stream?
by Turritopsis Dohrnii Teo En Ming 16 Dec '20

16 Dec '20

Good day from Singapore, What are the differences between CentOS Linux and CentOS Stream? At the moment, I only know that CentOS 8 support will end on 31 December 2021 while Red Hat Inc will shift its focus to CentOS Stream. Is CentOS Stream going to be very similar to Fedora Linux, shipping with the latest Linux Kernel like 5.10.1? I am looking forward to hearing from you. Thank you. -----BEGIN EMAIL SIGNATURE----- The Gospel for all Targeted Individuals (TIs): [The New York Times] Microwave Weapons Are Prime Suspect in Ills of U.S. Embassy Workers Link: https://www.nytimes.com/2018/09/01/science/sonic-attack-cuba-microwave.html ******************************************************************************************** Singaporean Targeted Individual Mr. Turritopsis Dohrnii Teo En Ming's Academic Qualifications as at 14 Feb 2019 and refugee seeking attempts at the United Nations Refugee Agency Bangkok (21 Mar 2017), in Taiwan (5 Aug 2019) and Australia (25 Dec 2019 to 9 Jan 2020): [1] https://tdtemcerts.wordpress.com/ [2] https://tdtemcerts.blogspot.sg/ [3] https://www.scribd.com/user/270125049/Teo-En-Ming -----END EMAIL SIGNATURE-----

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What about the AltArch repositories? (+ some experiments with aarch64 on Raspberry Pi)
by Mathieu Baudier 16 Dec '20

16 Dec '20

Hello, given the recent change in direction of CentOS, what will become of the AltArch repositories? (like CentOS 7 aarch64 and the related kernel repositories) I have been experimenting (with some success) with running a regular CentOS 8 aarch64 (ARM 64 bits) on a Raspberry PI 4 (with 4GB RAM), using the aarch64 kernel-rpi2 provided by CentOS 7 AltArch [1]. (a few more technical details below) This is a very different question than what is currently hotly discussed on this list, with the end of the bug-for-bug clone of RHEL, as there were never expectations that such settings would be supported. But on the other hand, I liked to use CentOS for innovation in a given field (mostly Java related) as its stability allowed one to go deep into one direction with "other things being equal" (contrary to Fedora, which is always moving in all directions). I guess that all these "side projects" (and SIGs, etc.) will disappear as well, won't they? Cheers, Mathieu ## More details about running CentOS aarch64 on a Raspberry Pi 4 As for my experiments with running CentOS 8 on a Raspberry Pi 4, a bit more details, so that these efforts are not completely lost. Two approaches were working : - From a plain CentOS 7 AltArch aarch64 installation, perform a CentOS 8 aarch64 install in a chroot (with the --installroot option) + a clean kernel-pi2 install from the CentOS 7 kernel-pi2 repository. Then copy the chroot to an .img file, and use this image to initialise an SD card. - From a plain CentOS 7 AltArch aarch64 installation, perform an in-place upgrade to CentOS 8 (first install dnf from EPEL, then switch the repos, and it works) The second approach had better device support on the Raspberry Pi 4 (most importantly the wifi, which was not working with the first approach), but this was probably a matter of subtle kernel / modprobe configs that were beyond my skills. I thought that I would share all this at some point, and ask for help from the CentOS AltArch developers; but I guess it is irrelevant right now. Both approaches were working equally well on the Raspberry Pi 3 (but Fedora support is good for this version, while Raspberry Pi 4 is not supported, so I tend to use Fedora aarch64 on them). As for what is actually the point of doing all this, this is not for weekend hobby tinkering, and it is relevant for server-side applications. ARM 64 bits is becoming an important platform (hence the fact that RHEL is now supporting it, MacOS will soon completely move to it, etc.) especially if one is interested in climate-friendly low-power IT, also on the server-side. But finding hardware is not easy and the (cheap) Raspberry Pi have 64-bit capable processors, even though the default distrib (Raspbian, based on Debian) does not yet support 64 bits (but they are working on it [2]). After trying many distributions, a paradox was that CentOS was actually the easiest to deploy and use in order to get some results (thanks to the work of the AltArch team!) In my case, the main interest was to test on ARM 64 bits GraalVM, the next generation Java platform, which can compile Java (and other programming languages) to native code. These builds require a lot of memory, but with an extremely slimmed down CentOS 8 and the 4 GB memory of the Raspberry Pi 4, it worked! [3] On a different layer, I could also test Eclipse SWT (Java user interface library) on this architecture (but on the plain CentOS 7 aarch64 with GNOME), and provide some quick feedback to Eclipse developers on their recent support for the whole Eclipse IDE on ARM 64 bits. [4] [1] http://mirror.centos.org/altarch/7/kernel/aarch64/kernel-rpi2 [2] https://downloads.raspberrypi.org/raspios_arm64/images/ [3] https://twitter.com/mbaudier/status/1274263320254722050 [4] https://twitter.com/mbaudier/status/1291421892381937670

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Blog article: CentOS is NOT dead
by Nicolas Kovacs 16 Dec '20

16 Dec '20

Hi, Here's an interesting read which makes a point for CentOS Stream: https://freedomben.medium.com/centos-is-not-dead-please-stop-saying-it-is-a… tl;dr: Communication about Stream was BAD, but Stream itself might be a good thing. Here's why. 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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Status of DLM in CentOS?
by Michael Schwartzkopff 16 Dec '20

16 Dec '20

Hi, I was searching for DLM for my Centos 8. But it seems there are no packages available. I already enabled the HA repo. But no success. Now I changed to centos stream, but still no package available. How is centos going to ensure correct locking in a shared storage environment? Any help appreciated. Mit freundlichen Grüßen, -- [*] sys4 AG https://sys4.de, +49 (89) 30 90 46 64 Schleißheimer Straße 26/MG,80333 München Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Marc Schiffbauer, Wolfgang Stief Aufsichtsratsvorsitzender: Florian Kirstein

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On-demand audio streaming software
by Nicolas Kovacs 16 Dec '20

16 Dec '20

Hi, Since 2006 I had a streaming audio server based on Icecast and MPD running on CentOS. It works like a little webradio, e.g. listeners connect to a live stream with VLC, Audacious or any other client capable of this. I wonder if there's some software that can stream on-demand audio like music playlists or podcasts. What I'd like to do is host a series of playlists (like "Radio Show of the week") or podcasts, and then someone who wants to listen to it clicks on it and can listen to it from start to end. Any suggestions? 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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DLM in CentOS?
by Michael Schwartzkopff 16 Dec '20

16 Dec '20

Hi, about one week ago I asked about the status of the distributed lock manager DLM in CentoOS. I could could not find it in any repositories. I also got no answer on my mail to this list. So any answer to my question? Mit freundlichen Grüßen, -- [*] sys4 AG https://sys4.de, +49 (89) 30 90 46 64 Schleißheimer Straße 26/MG,80333 München Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Marc Schiffbauer, Wolfgang Stief Aufsichtsratsvorsitzender: Florian Kirstein

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Fix for CVE-2020-1971 on CentOS 6.10
by Simon Matter 16 Dec '20

16 Dec '20

Hi, While many of us were busy lately with upgrading CentOS 6 systems to CentOS 8, a lot of systems may still be running CentOS 6 and migrations came to a halt this week with the announcement of RedHats new direction for the CentOS project. Since security updates for CentOS 6 are not provided anymore, I've decided to try my best to address CVE-2020-1971 and I welcome others to do the same for this and other new issues which may come up. Attached patches: openssl.spec.patch.gz openssl-1.0.1e-cve-2020-1971.patch.gz Please let me know if you find any issues. Regards, Simon

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The conclusio: CentOS is dead
by Walter H. 15 Dec '20

15 Dec '20

Why? it is called "rolling release" and no one gave officially a statement to the question I asked, if it is meant like that of Win10 ... a beta release is not the same that many expect as a stable system, as they are used to have with CentOS; you should think of renaming CentOS to something different, because with Enterprise this CentOS Stream has nothing in common; and does Redhat really expect everone - even private people - afford a RHEL subscription¹ just to have a stable system? ¹ I would in case I only need just one RHEL subscription for ALL my private used VMs (including the ones hosted in internet as VPS) - a DNS server - a proxy server (squid) - a mail server (mail store - cyrus-imapd) - a mail server (mail router f. outgoing mails) - a mail server (mail scanner f. incoming mails with SpamAssassin and ClamAV) - a 2nd proxy server (squid, with SSL interception and Squidclamav plus ClamAV) - a web server (apache) - a jump host - a 6in4 router - desktop with graphical UI (plus Firefox and Thunderbird) is a now a SL, but they decided several time ago, not to do their own system based on RHEL, they use CentOS, that is now a little bit bad for this/SL's use case; - a VPS with OpenVPN (used with my smartphone) - a VPS with a proxy (squid, to avoid censorship due to geolocation blocking) - a VPS as the other end of 6in4 - a VPS with storage of my own files (all VPS run a bind, too) Thanks for read; Walter

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Oracle Linux - oracle-epel vs epel - dnf priority
by Frank Cox 14 Dec '20

14 Dec '20

I'd like to run this by you guys and get your opinion. For those of us who are considering moving to Oracle Linux (or at least doing some experimenting with it), I just had an idea for dealing with the fact that the oracle-el-epel apparently doesn't have all of the packages that are in the fedora-el-epel that we all know and love. It makes sense to me to use the oracle epel with OL to the greatest extent possible simply because it's part of OL. To get around the missing package issue, what about setting up both oracle-epel and fedora-epel, and then using the dnf priorities to pick the stuff from oracle-epel first and if it's not there then grab it from fedora-epel. One issue that I can see (though it may not be an actual issue) is the way the priorities setting works: QUOTE: priority integer The priority value of this repository, default is 99. If there is more than one candidate package for a particular operation, the one from a repo with the lowest priority value is picked, possibly despite being less convenient otherwise (e.g. by being a lower version). END OF QUOTE By setting fedora-epel to a lower priority, the if a package we want is only in fedora-epel, we'll grab it from there. But if that package has a dependency on another package version X that can be found in fedora-epel and for some reason oracle-epel supplies only package version X-1, what happens then? Is dnf smart enough to pick the higher-versioned (and required) package from fedora-epel even though it has a lower priority. I'll try to explain that again. I want to install Foo, which is only in fedora-epel. Foo requires Bar version 2.0. Bar 2.0 exists in fedora-epel, but oracle-epel has only Bar version 1.0. What happens then? Does dnf see that Foo requires Bar-2.0 and get it from fedora-epel even though it has a lower priority? -- MELVILLE THEATRE ~ Real D 3D Digital Cinema ~ www.melvilletheatre.com

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Discuss December 2020