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Problem upgrading from 8.0 to 8.1
by Michael Schwartzkopff 02 Dec '20

02 Dec '20

Hi, I want to upgrade from 8.0 to 8.1 but yum update does not work. Still 8.0 Probably the cause is that I compiled DRBD myself because it was not available for 8.0 when I set up the machine. Now yum update says: Error: Problem 1: cannot install the best update candidate for package drbd-pacemaker-9.11.0-1.el8.x86_64 - nothing provides pacemaker needed by drbd-pacemaker-9.13.1-1.el8.x86_64 Problem 2: cannot install both drbd-utils-9.13.1-1.el8.x86_64 and drbd-utils-9.11.0-1.el8.x86_64 - package drbd-heartbeat-9.11.0-1.el8.x86_64 requires drbd-utils = 9.11.0-1.el8, but none of the providers can be installed - cannot install the best update candidate for package drbd-utils-9.11.0-1.el8.x86_64 - problem with installed package drbd-heartbeat-9.11.0-1.el8.x86_64 Problem 3: cannot install both drbd-utils-9.13.1-1.el8.x86_64 and drbd-utils-9.11.0-1.el8.x86_64 - package drbd-pacemaker-9.11.0-1.el8.x86_64 requires drbd-utils = 9.11.0-1.el8, but none of the providers can be installed - package drbd-9.13.1-1.el8.x86_64 requires drbd-utils = 9.13.1, but none of the providers can be installed - problem with installed package drbd-pacemaker-9.11.0-1.el8.x86_64 - cannot install the best update candidate for package drbd-9.11.0-1.el8.x86_64 - nothing provides pacemaker needed by drbd-pacemaker-9.13.1-1.el8.x86_64 (try to add '--allowerasing' to command line to replace conflicting packages or '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages) with --nobest yum update runs through without doing anything and I sill have kernel 4.18.0-80.11.2.el8_0.x86_64 Any ideas how to update my server? 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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CentOS 7, as a 6in4 server
by Walter H. 02 Dec '20

02 Dec '20

Hello, I have a VPS at a hoster where I got 3 /64 ipv6 prefixes/subnets, that are routed; one for the VPS itself - let us call this srvprefix one for the tunnel, only ::1 (server side) and ::2 (home side) are used - let us call this tunnelprefix and one for my network at home - let us call this homeprefix now I'm just in test state, a CentOS VM is the other end of the tunnel; (when the server runs well, my CentOS ZBOX will become the other end of the tunnel) at the server the eth0 device has serverprefix::1, the sit1 device has tunnelprefix::1 the routing is set with /etc/sysconfig/network-scripts/route6-sit1 tunnelprefix::2 dev sit1 homeprefix::/64 via tunnelprefix::2 dev sit1 in sysctl.conf these are set net.ipv6.conf.all.forwarding = 1 net.ipv6.conf.all.proxy_ndp = 1 now I have to do these ip -6 neigh add proxy homeprefix::1 dev eth0 ip -6 neigh add proxy homeprefix::### dev eth0 the question, can I do something to avoid these "ip -6 neigh ..."? if yes, what? and how? can the hoster do something? if yes, what? Thanks, Walter my ISP told me that he won't deploy IPv6 within the next 5 years;

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Re: [CentOS] Reminder: CentOS 6 EOL on 30 November 2020
by Fabian Arrotin 02 Dec '20

02 Dec '20

On 30/11/2020 13:39, Fabian Arrotin wrote: > On 30/11/2020 11:18, Manuel Wolfshant wrote: >> On 11/30/20 10:25 AM, Fabian Arrotin wrote: >>> On 09/11/2020 14:24, Johnny Hughes wrote: >>>> All, >>>> >>>> This is a friendly reminder. >>>> >>>> CentOS 6.10 will EOL at the end of November 2020. >>>> >>>> During the first week in December 2020, the 6.10 directory will move to >>>> vault.centos.org >>>> >>>> Packages will still be available at: >>>> >>>> http://vault.centos.org/centos/6.10/ >>>> >>>> However, once moved, there will be no more updates pushed to >>>> vault.centos.org. Therefore, security issues will no longer be fixed, >>>> etc. >>>> >>>> You should take the rest of the month to either move to a newer versoin >>>> of CentOS Linux ... or to procure Extended el6 support from Red Hat (EUS >>>> RHEL 6). >>>> >>>> Thanks, >>>> Johnny Hughes >>>> >>> As announced multiple times (on list[s], twitter, glog.centos.org and >>> even https://c6eol.centos.org) , CentOs 6 is now EOL and so is being >>> retired from mirror network. >>> It's currently being moved to (capped and limited bandwidth) >>> vault.centos.org and will be removed from mirror.centos.org (and so >>> external mirrors in the next hours/days). >>> mirrorlist.centos.org will also (like we do for all >>> outdated/unmaintained and unsecured releases) start answering "invalid >>> release" >>> >>> Kind Regards, >> >> Just to let you all know that starting from today, mirrorlist.centos.org nodes answer "Invalid release/repo/arch combination" and also that content was removed from mirrors. Johnny pushed the last updates yesterday, that went out to external mirrors . These mirrors will also delete all that content so if your *really* need to find such content, https://vault.centos.org is the only way to to go, but due to reduced bandwidth, capacity, we encourage you to use one of the external mirrors listed on vault.centos.org, with probably more resources/bandwidth that we currently have. Some of these mirrors also continue to offer rsync access. Cheers, and time to have a drink and celebrate 10 years of CentOS 6 : you served us all well ! -- Fabian Arrotin The CentOS Project | https://www.centos.org gpg key: 17F3B7A1 | twitter: @arrfab

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Upgrade OpenSSH version to the latest stable version on CentOS Linux release 7.9.2009 (Core).
by Kaushal Shriyan 01 Dec '20

01 Dec '20

Hi, I am running CentOS Linux release 7.9.2009 (Core). Is there a way to upgrade OpenSSH version openssh-7.4p1-21.el7.x86_64 to the latest stable version openssh-server 8.4 using yum repositories or rpm binaries? Best Regards, Kaushal

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CentOS and mdadm
by Nicolas Kovacs 01 Dec '20

01 Dec '20

Hi, I'm regularly using software RAID for my CentOS storage servers, either with RAID 1 or RAID 6 depending on the number of disks. Here's two questions about mdadm I've always been wondering about. 1. I'm not sure about the --metadata option. Let's say I want to create a simple RAID 1 setup, I'm usually doing it like this: # mdadm --create /dev/md/boot --level=1 --raid-devices=2 \ --metadata=1.2 /dev/sda1 /dev/sdb1 If anyone can explain the exact meaning of --metadata, I'd be grateful. Oh, and is it OK to use --metadata=1.2 in CentOS 7.x and 8.x ? 2. I'm regularly encountering the mdadm --misc option in various tutorials on the Internet. I looked it up in mdadm's manpage, but it doesn't seem to be documented. Any idea what this option does ? 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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Physical position of swap partition on the disk
by Nicolas Kovacs 01 Dec '20

01 Dec '20

Hi, Here's a question to the fine-tuning gurus. Yesterday while installing a fresh CentOS server, I wondered how big of a deal the physical position of the swap partition on the disk is. Here's an example of a simple MBR partitioning scheme on a legacy BIOS machine with a 60 GB SSD: * /dev/sda1: 500 MB /boot ext2 * /dev/sda2: 4 GB swap * /dev/sda3: 55 GB / ext4 In the old (Slackware) days, I created the partitions manually using fdisk. Now when I do something similar in Anaconda, I have to reason in terms of mount points. So in a similar order I create the /boot partition, the swap partition and the root partition. What happens here is that Anaconda will always invert the root and swap partitions and put the swap partition at the end of the disk. So my setup looks like this: * /dev/sda1: 500 MB /boot ext2 * /dev/sda2: 55 GB / ext4 * /dev/sda3: 4 GB swap I'd be curious to know what's the reason behind this, and if this kind of configuration detail is really significant. 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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Anaconda : MBR vs. GPT
by Nicolas Kovacs 28 Nov '20

28 Nov '20

Hi, I've always been a bit puzzled by the fact that Anaconda provides no option to manually create a partition table and specify if it's MBR or GPT. >From what I can tell - at least under CentOS 7.x - Anaconda will default to MBR, even if I specify a BIOS Boot partition. Maybe it switches automatically to GPT if the disk size requires it ( > 2 TB IIRC) though I don't have any corresponding hardware here to test it. Is this documented somewhere? Or is there a nifty little trick to tell Anaconda to prefer GPT partition tables? 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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Emulate Ghost4Linux with standard Linux commands?
by Nicolas Kovacs 28 Nov '20

28 Nov '20

Hi, I'm currently trying to solve a tricky problem, and I don't even know if it's possible. Let me describe the situation with a practical example. In my office I have a sandbox PC for testing various setups that can't be tested in a virtual machine. I'm using this machine to test various setups with the Linux distributions I'm using, namely CentOS 7, CentOS 8 and OpenSUSE Leap 15. I have a series of Ghost images of these systems on a local FTP server, and I'm using G4L (Ghost4Linux) to transfer these images to and from the server. * https://sourceforge.net/projects/g4l/ On a side note, I take care of zeroing unused disk space in order to get relatively compact disk images like this: # dd if=/dev/zero of=/0bits bs=20M ; rm -f /0bits Besides my local sandbox machine, I also have a sandbox server in a datacenter, which I'm using for testing Internet-facing stuff. I'd like to be able to do something similar with this public machine, e. g. backup the whole disk content completely agnostic in terms of partitions and file systems and send it to a public FTP server. Unfortunately I can't boot G4L on this server, since I don't have physical access to the machine. The datacenter is about 700 km from where I can live. What I can do: fire up a rescue console via an administration web interface and boot a live Linux system, either Ubuntu 16.04 or 18.04. Now here's the question. From within my live system, how could I compress my system into a compact image and then send it to a distant FTP server? And once this is done, how could I get my image back from the server? Cheers from the sunny South of France, 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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dnf via ansible fails if baseurl is used on CentOS 8
by Thomas Eriksson 26 Nov '20

26 Nov '20

Hi, I ran into an odd issue on CentOS 8, anyone seen this? When repos are configured to use baseurl instead of mirrorlist, the ansible dnf module fails. It is as if it is ignoring the baseurl configuration. #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=BaseOS&infra=$infra baseurl=http://my.local.repo.server/$contentdir/$releasever/BaseOS/$basearch/os/ If trying to use the dnf module in ansible, dnf is still trying to find a mirror to use and fails. ansible test-build-0 -m dnf -a "name=zsh state=present" test-build-0 | FAILED! => { "changed": false, "msg": "Failed to download metadata for repo 'BaseOS': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried", "rc": 1, "results": [] } Using dnf locally from the command line works fine with baseurl If I re-configure with repos using mirrorlist again, ansible dnf works as expected. Just looking for ideas... /Thomas

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Replacing SW RAID-1 with SSD RAID-1
by Frank Bures 26 Nov '20

26 Nov '20

Hi, I want to replace my hard drives based SW RAID-1 with SSD's. What would be the recommended procedure? Can I just remove one drive, replace with SSD and rebuild, then repeat with the other drive? Thanks Frank -- <listfrank1(a)gmail.com>

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