Discuss August 2020

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95 participants
63 discussions

Boot fails with lvm snapshot
by Patrick Bégou 20 Aug '20

20 Aug '20

Hi, I have a strange problem with my centos7 file server. I have a large data storage (75TB in RAID6, managed by lvm) and each night I create a snapshot (removing first the previous one). The snapshot is mounted read-only so if a user remove a file accidentally he can restore it in the same day. However, if this snapshot exists, reboot of the server freeze at boot time and I must manually remove this snapshot. Why ? There are no entry in /etc/fstab for this snapshot, it is a cron script that manage this snapshot and mount it. Patrick

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Where can CentOS7 yum-cron logs be found?
by Gunnar Niels 19 Aug '20

19 Aug '20

I'm trying to setup two CentOS7 systems with automatic security updates to run as my kubernetes nodes. I've also centralized all my outgoing mail through my mailgun service, so I've been using the cli tool "mailx", which I have configured with my credentials. Coming from Fedora32 and CentOS7, dnf-automatic had a helpful emission target that was "email_command". By default it sent notifications using this command. With yum-cron, all I see is "email", which doesn't appear to use the "mail" command. I would like to set up something myself to send the daily yum activity, but it's not clear at all where I should expect the yum-cron "stdio" output to end up at. I "started" the service, which is really just creates sentincal file to allow the yum.daily cron entry to run. However, when I look at /var/log/yum, there's nothing there of interest. I can see that it claims to have run, but I have no idea what it did. Is there another place I should be looking for what this actually did? Separately, I'm looking for a way to confirm its behavior. I was able to do this on my dnf systems by downgrading a package, but if I use `yum downgrade X` on this CentOS7 system...it just reports success and does nothing. Any ideas about that one? -GN

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how to run CentOS 8.2 under new WSL2?
by Dev Linux 18 Aug '20

18 Aug '20

I want to run CentOS 8.2 (2004) under Windows 10 Pro (2004) that comes with WSL2 1. Is there a list of steps anywhere, that would help me download what I need, and get CentOS 8.2 running under WSL2? 2. What would I need to download? (need direct URL - there are so many options for CentOS 8.2 , I am confused) 3. What steps would I need to take to get this running locally on my Windows 10 machine? Notes: ==> I don't want to run any existing CentOS available in the Windows store, I want to roll my own ==> I don't want to run CentOS 8.2 under VirtualBox or any other virtualization technology, just WSL2 ==> I don't want to download any .zip from a previous release that is not CentOS 8.2, ideally would like to be self-sufficient and gain the knowledge on how to do this myself. --- If anyone has actually done this with CentOS 8.2 and WSL2 and has it working swimingly, please reply, would love to get this up and running for a higher level of productivity, scripting and automation on my Windows dev box.

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Installing devtoolset-6 on CentOS 8
by Eric Gervais-Despres 18 Aug '20

18 Aug '20

Has anybody tried (and succeeded) to get gcc 6.3.1 (or devtoolset-6) to work on CentOS 8? In the Animation and Visual Effect industry, gcc 6.3.1 is still the current recommended compiler (see www.vfxplatform.com), and is required to build many plugins. Unfortunately, it is not a "minimum requirement"... It is THE requirement. So I tried to get it from the vault: -- sudo dnf config-manager --add-repo= http://vault.centos.org/7.6.1810/sclo/x86_64/rh/ sudo dnf install devtoolset-6 -- but I get these messages: -- Error: Problem: package devtoolset-6-6.1-1.el7.x86_64 requires devtoolset-6-runtime, but none of the providers can be installed conflicting requests nothing provides policycoreutils-python needed by devtoolset-6-runtime-6.1-1.el7.x86_64 (try to add '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages -- All options fail. I hate having to install something not officially supported anymore, but still officially required for many current software. Thank you. -- *Éric Gervais-Després* President 4270 St-Laurent #300 Montréal, Qc, Canada, H2W 1Z3 +1-514-705-4946 *www.ngeniousstudio.com <http://www.ngeniousstudio.com>*

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Replacement for KMail V1
by Gary Stainburn 17 Aug '20

17 Aug '20

Last week my trusty Fedora 9 file and print server failed on me. Not bad for 12 years trusty service. I have now replaced it with a C7 server and found that lots have changed in those 12 years. Thankfully many things haven't, named-chroot, dhcpd, etc pretty much copied across and Samba wasn't a major rewrite. However I feel like my right arm has been chopped off. My work life revolves around my emails which were in KMail version 1.x. My first thought was to move to the current KMail which is version 4.x. The problem is that it's cr*p. It appears to be the same as V1, but just more up to date - perfect. Unfortunately it is so slow that it is completely unusable, even on a brand new server. As a GUI it is unusable, and functionally fails with connections time out etc. Some research has found that KMail was stuffed as far back as V2 when they moved to using an embedded MYSQL engine to drive it. What I would really like is advice on how to make KMail V4 usable. As I doubt that is possible can anyone please recommend a decent email client with good keyboard short-cuts and filtering processes. I am currently limping along using Thunderbird but I find the lack of useful keystroke functions (such as next unread message, next folder with an unread message) annoying. Having to move my hand from keyboard to mouse is more exercise than I'm used to.

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Samba rpms now available from Storage SIG
by Anoop C S 17 Aug '20

17 Aug '20

Hi all, This is to announce the availability of Samba(and CTDB) rpms from Storage SIG[1] on CentOS 7 and 8. Visit Samba's CentOS Storage SIG wiki page[2] for more details on installation steps. [1] https://wiki.centos.org/SpecialInterestGroup/Storage [2] https://wiki.centos.org/SpecialInterestGroup/Storage/Samba Regards, Anoop C S.

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Teo En Ming's Learning Achievements on 14 August 2020 Friday
by Turritopsis Dohrnii Teo En Ming 15 Aug '20

15 Aug '20

Subject: Teo En Ming's Learning Achievements on 14 August 2020 Friday [1] Activate Cisco AnyConnect SSL VPN License on Cisco ASA 5506-X Firewall Today I discovered that the base license for Cisco ASA 5506-X Firewall only allows maximum 2 SSL VPN users. I had to login to https://www.cisco.com/go/license, assign the PAK/token to the serial number of Cisco ASA 5506-X firewall and perform a license request to Cisco. After receiving the Product Authorization Key from Cisco, I had to activate it on the Cisco ASA 5506-X firewall using the following CLI commands: enable config t activation-key 12345678 12345678 12345678 12345678 12345678 The number of AnyConnect Premium Peers has been increased from 2 to 50 after license activation. [2] Configuring NIC teaming/bonding on CentOS 8.2 (2004) Linux Server Today I had to configure NIC teaming/bonding on CentOS 8.2 (2004) Linux Server. The server hardware is Dell PowerEdge R640 with 2x 10GE NIC ports and 6x 1GE NIC ports. NIC teaming/bonding was configured using 2x 10GE NIC ports. All I had to do is to follow the following reference guide. Reference Guide: How to Configure NIC Teaming on CentOS 8 / RHEL 8 Link: https://www.linuxtechi.com/configure-nic-teaming-centos-8-rhel-8/ In my situation, the network interfaces used in the NIC teaming/bonding are eno1 and eno2. Both are 10 Gigabit per second. -- -----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 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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Dumb Centos 8 DNF mirror question...
by Tom Bishop 14 Aug '20

14 Aug '20

I have several Centos 8 machines that I update and every now and again I will go through and update all of them and one of them will get a slow mirror, like downloading the kernel at 50kb etc. With the newer version I am unable to figure out how to force it to update the mirror list and hopefully change to a faster mirror. I have searched but must not be using the right verbiage since I am unable to find the easy solution to dump the mirrors and re-select. Thanks :)

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After update to 8 (2004) ... system is unbootable - UEFI Secure boot
by Leon Fauster 13 Aug '20

13 Aug '20

Hi all, I updated a Dell XPS laptop from CentOS 8.1 (1911) to 8.2 (2004). Installed kernels are kernel-4.18.0-147.5.1.el8_1.x86_64 kernel-4.18.0-147.8.1.el8_1.x86_64 kernel-4.18.0-193.6.3.el8_2.x86_64 Unfortunately I can not boot into the latest kernel-4.18.0-193.6.3.el8_2.x86_64. After grub2 screen I only see following line: EFI stub: UEFI Secure Boot is enabled Booting into the older kernel is still possible. The above line appears and after that the normal kernel output scrolls over the screen (rhgb quiet disabled). Is the new kernel correctly signed? What can I do? -- Thanks Leon

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kvm & external snapshots
by Gregory P. Ennis 13 Aug '20

13 Aug '20

Everyone, I am trying to create external snapshots of a kvm guest machine and have not been able to do so. In accordance with : https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/ht… I have used the command line : snapshot-create-as --diskspec vda,snapshot=external,file=/u4/guest/MaBa- clone/test.snap.img--domain MaBa-clone --name MaBa-clone_snap --description "Snap before 9Aug2020" This command line gives me the error : error: unsupported configuration: disk 'vda' must use snapshot mode 'internal' Is it possible to perform an external snapshot of a kvm guest? Greg Ennis

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Discuss August 2020