Discuss October 2020

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52 discussions

dbus issue on centos 7 as a lxc container
by Sergio Belkin 07 Oct '20

07 Oct '20

Hi, dbus on centos 7 lxc won't work. So I'm unable to start or query status units with systemd, for example: systemctl status Failed to get D-Bus connection: No such file or directory I have no issues with centos 8 container (debian 10 ones work fine too) This is the output of ps aux on centos 7: USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 1 0.0 0.0 42712 3860 ? Ss 20:11 0:00 /lib/systemd/systemd systemd.unified_cgroup_hierarchy=1 root 2 0.0 0.0 11840 3052 ? Ss 20:12 0:00 /bin/bash root 28 0.0 0.0 51772 3548 ? R+ 20:19 0:00 ps aux On Centos 8 instead: USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 1 0.0 0.0 241980 5320 ? Ss Oct06 0:01 /lib/systemd/systemd systemd.unified_cgroup_hierarchy=1 root 17 0.0 0.0 93944 5552 ? Ss Oct06 0:00 /usr/lib/systemd/systemd-journald root 22 0.0 0.0 97164 2892 ? Ss Oct06 0:00 /usr/lib/systemd/systemd-udevd root 34 0.0 0.0 85920 5252 ? Ss Oct06 0:00 /usr/lib/systemd/systemd-logind dbus 35 0.0 0.0 54108 2312 ? Ss Oct06 0:00 /usr/bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activat ion --syslog-only root 37 0.0 0.0 368376 7076 ? Ssl Oct06 0:03 /usr/sbin/NetworkManager --no-daemon root 42 0.0 0.0 78536 4124 ? Ss Oct06 0:00 /usr/sbin/sshd -D -oCiphers=aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes256 -ctr,aes256-cbc,aes128-gcm(a)openssh.com,aes128-ctr,aes128-cbc -oMACs=hmac-sha2-256-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-128-etm@openssh.com,hmac- sha2-512-etm@openssh.com,hmac-sha2-256,hmac-sha1,umac-128@openssh.com,hmac-sha2-512 -oGSSAPIKexAlgorithms=gss-gex-sha1-,gss-group14-sha1- -oKexAlgorithms= curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellma n-group14-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1 -oHostKeyAlgor ithms=rsa-sha2-256,rsa-sha2-256-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384,ecdsa-sha2-nistp384- cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-512-cert-v01@openssh.com,ecdsa-sha2-nistp521,ecdsa-sha2-nistp521-cert-v01@openssh.com,ssh-ed25519,ssh-ed25519-c ert-v01@openssh.com,ssh-rsa,ssh-rsa-cert-v01@openssh.com -oPubkeyAcceptedKeyTypes=rsa-sha2-256,rsa-sha2-256-cert-v01(a)openssh.com,ecdsa-sha2-nistp256,ecdsa -sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384,ecdsa-sha2-nistp384-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-512-cert-v01@openssh.com,ecdsa-sha2 -nistp521,ecdsa-sha2-nistp521-cert-v01@openssh.com,ssh-ed25519,ssh-ed25519-cert-v01@openssh.com,ssh-rsa,ssh-rsa-cert-v01@openssh.com -oCASignatureAlgorith ms=rsa-sha2-256,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,rsa-sha2-512,ecdsa-sha2-nistp521,ssh-ed25519,ssh-rsa root 45 0.0 0.0 6520 660 pts/3 Ss+ Oct06 0:00 /sbin/agetty -o -p -- \u --noclear --keep-baud pts/3 115200,38400,9600 vt220 root 46 0.0 0.0 6520 724 pts/2 Ss+ Oct06 0:00 /sbin/agetty -o -p -- \u --noclear --keep-baud pts/2 115200,38400,9600 vt220 root 47 0.0 0.0 22868 1848 ? Ss Oct06 0:00 /usr/sbin/crond -n root 48 0.0 0.0 6520 664 console Ss+ Oct06 0:00 /sbin/agetty -o -p -- \u --noclear --keep-baud console 115200,38400,9600 linux root 50 0.0 0.0 6520 728 pts/1 Ss+ Oct06 0:00 /sbin/agetty -o -p -- \u --noclear --keep-baud pts/1 115200,38400,9600 vt220 root 61 0.0 0.0 283500 2176 ? Ssl Oct06 0:07 /usr/sbin/rsyslogd -n root 442 0.0 0.0 6520 1640 pts/0 Ss+ 19:47 0:00 /sbin/agetty -o -p -- \u --noclear --keep-baud pts/0 115200,38400,9600 vt220 root 461 0.0 0.0 12020 3340 ? Ss 20:12 0:00 /bin/bash root 480 0.0 0.0 44600 3368 ? R+ 20:22 0:00 ps auxwww Is there a Centos Bug? Or I missing something? The host is Fedora 32, if you need more information, ask me for. Thanks in advance! -- -- Sergio Belkin LPIC-2 Certified - http://www.lpi.org

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Centos 7.7 and ATI driver
by H 07 Oct '20

07 Oct '20

As you have seen in another message I have a failed system after an update from 7.5. I /think/ the issue might be with the ATI driver which seems to fail to load a framebuffer in Xorg.0.log. Is anyone successfully running a Radeon graphics card on 7.7? If so, might you share any issues and solutions? Thanks.

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strange email from cron regarding "rear"
by Fred 07 Oct '20

07 Oct '20

I don't understand what this means, I found it in root's email this morning: To log into the recovery system via ssh set up /root/.ssh/authorized_keys or specify SSH_ROOT_PASSWORD WARNING: /usr/lib/grub/x86_64-efi/moddep.lst not found, grub2-mkimage will likely fail. Please install the grub2-efi-x64-modules package to fix this. ERROR: Error occurred during grub2-mkimage of BOOTX64.efi Aborting due to an error, check /var/log/rear/rear-fcshome.log for details /bin/sh: line 1: 30339 Terminated /usr/sbin/rear mkrescue It is possible it has happened before, as until recently I haven't paid a lot of attention to root's email (I know, I know,... bad me). but I wonder what it's all about... I have not knowingly ever used "rear" or "mkrescue". BTW, this is on an up to date Centos-7 X86-64 machine. Thanks in advance! Fred

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How to solve missing net-snmp-perl?
by Andre Herms 07 Oct '20

07 Oct '20

Hello, Since Centos 8.2 the net-snmp-perl RPM seems missing. I already found a bug ticket https://bugs.centos.org/view.php?id=17408 It looks like the package should actually be available in AppStream. But for some reason it's not. The package stuff at https://git.centos.org/rpms/net-snmp.git look like before. The RPM file should be generated. Now I wonder, how does the Centos infrastructure decide, which RPM to include into the repository? When it's based on the tags, shouln't the net-snmp-perl RPM be included together with the other RPMs? I already studied the public available documation of the build system. But I couldn't get the information I need. Any hint for me? Thanks.

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Re: [CentOS] Viewing changelog for packages to be updated
by Akemi Yagi 07 Oct '20

07 Oct '20

On Wed, Aug 26, 2020 at 2:54 PM Kenneth Porter <shiva(a)sewingwitch.com> wrote: > > Is there some way to see the RPM changelog entries for a prospective yum > update? Ideally I'd like to see just the entries that are newer than the > version of the package I already have. > > I saw a new kernel in today's yum-cron email and I'd like to know what it's > about and how urgent the issue is for me. You may want to look into git.centos.org. For example, spec file diff for the latest C7 kernel update can be seen here: https://git.centos.org/rpms/kernel/c/c53828b00fb26a7f96b149eef5e220a5ed4cc4… Akemi

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[CentOS7] cups, cups-browsed
by Patrick Bégou 06 Oct '20

06 Oct '20

Hi, I have a strange problem on one laptop with cups in CentOS7, all updates applied. Sometime, the lpstat -t command returns "No destination host name supplied by cups-browsed for printer" and asks if cups-browsed is running. Nonetheless cups-browsed is running and is configured. Restarting cups-browsed does not help so the problem is not related to cups-browsed . The solution is to manually restart cups service But, the user has no root access on his laptop (it is not allowed in our professional environment) so the only work-around would be a cron task. But this is a work-around, not a solution to this problem. Did someone encounter this behavior and found the solution ? Could it be related to swiching from Wifi (at home) to wired network (at workplace)? I have several laptops, all installed with the same kickstart file via PXE boot and cups running fine. All are DELL computers except this one which is a HP ZBook. Thanks Patrick

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how to enforce audio device precence?
by hw 06 Oct '20

06 Oct '20

Hi, how can I make it so that audio continues to go the monitor connected to the display port when another monitor gets connected to the HDMI port?

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Script to rebuild CentOS 8 boot ISO with plus kernel
by Chris Adams 06 Oct '20

06 Oct '20

I want to install CentOS 8 on some older Dells that have storage controllers dropped by RHEL 8. The CentOS 8 kernel-plus package supports them, so I wrote a script that rebuilds the boot ISO to boot and install using the kernel-plus package from the centosplus repo. https://github.com/cmadamsgit/misc-scripts/ I know you can use driver disks to load additional modules from elsewhere, but I wanted to end up with the kernel-plus anyway, so why not just do it during install? Lightly tested, but seems to work. Posting here in case it is useful to others. -- Chris Adams <linux(a)cmadams.net>

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certbot stopped working on CentOS 7: pyOpenSSL module missing required functionality
by Alexander Farber 05 Oct '20

05 Oct '20

Hello fellow CentOS users, I had this cronjob working for many moons on CentOS 7.8.2003: #minute hour mday month wday command 6 6 * * 1 certbot renew --post-hook "cat /etc/letsencrypt/live/raspasy.de/fullchain.pem /etc/letsencrypt/live/ raspasy.de/privkey.pem > /etc/letsencrypt/live/raspasy.de/haproxy.pem; systemctl resstart haproxy" (I run a post hook, because haproxy-1.5.18-9.el7.x86_64 from the CentOS packages wants to have the cert and the key in one file). Unfortunately, now certbot-1.7.0-1.el7.noarch has stopped working and the error message is: /usr/lib/python2.7/site-packages/josepy/util.py:9: CryptographyDeprecationWarning: Python 2 is no longer supported by the Python core team. Support for it is now deprecated in cryptography, and will be removed in a future release. from cryptography.hazmat.primitives.asymmetric import rsa Traceback (most recent call last): File "/usr/bin/certbot", line 9, in <module> load_entry_point('certbot==1.7.0', 'console_scripts', 'certbot')() File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 378, in load_entry_point return get_distribution(dist).load_entry_point(group, name) File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2566, in load_entry_point return ep.load() File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2260, in load entry = __import__(self.module_name, globals(),globals(), ['__name__']) File "/usr/lib/python2.7/site-packages/certbot/main.py", line 2, in <module> from certbot._internal import main as internal_main File "/usr/lib/python2.7/site-packages/certbot/_internal/main.py", line 20, in <module> from certbot._internal import account File "/usr/lib/python2.7/site-packages/certbot/_internal/account.py", line 18, in <module> from acme.client import ClientBase # pylint: disable=unused-import File "/usr/lib/python2.7/site-packages/acme/client.py", line 39, in <module> requests.packages.urllib3.contrib.pyopenssl.inject_into_urllib3() # type: ignore File "/usr/lib/python2.7/site-packages/urllib3/contrib/pyopenssl.py", line 118, in inject_into_urllib3 _validate_dependencies_met() File "/usr/lib/python2.7/site-packages/urllib3/contrib/pyopenssl.py", line 160, in _validate_dependencies_met "'pyOpenSSL' module missing required functionality. " ImportError: 'pyOpenSSL' module missing required functionality. Try upgrading to v0.14 or newer. I have the following python packages installed: # rpm -qa | grep python2 python2-oauthlib-2.0.1-8.el7.noarch python2-futures-3.1.1-5.el7.noarch python2-cryptography-1.7.2-2.el7.x86_64 python2-pip-8.1.2-14.el7.noarch python2-acme-1.7.0-1.el7.noarch python2-psycopg2-2.8.6-1.rhel7.x86_64 python2-certbot-1.7.0-1.el7.noarch python2-pyrfc3339-1.1-3.el7.noarch python2-distro-1.2.0-3.el7.noarch python2-configargparse-0.11.0-2.el7.noarch python2-josepy-1.3.0-2.el7.noarch python2-pyasn1-0.1.9-7.el7.noarch python2-six-1.9.0-0.el7.noarch python2-parsedatetime-2.4-6.el7.noarch python2-future-0.18.2-2.el7.noarch python2-requests-oauthlib-0.8.0-5.el7.noarch python2-mock-1.0.1-10.el7.noarch Does anybody please have an idea, what could I do? I like to use the stock packages only (for easier maintenance), wonder if a solution is still possible there... Thank you for any suggestions Alex

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Centos8: Glusterd do not start correctly when I startup or reboot all server together
by Dario Lesca 02 Oct '20

02 Oct '20

I have install and configure on two server centos8 glusterfs in replica mode in this manner: dnf install centos-release-gluster -y dnf install glusterfs-server glusterfs glusterfs-fuse -y systemctl enable --now glusterd gluster peer probe virt1 gluster peer status sh creavolume.sh gfsvol1 301G /gfsvol1 xfs # NOTE: this is a my shell script to create fs on lvm mkdir /gfsvol1/brick1 gluster pool list gluster volume create gfsvol1 replica 2 virt1:/gfsvol1/brick1 virt2:/gfsvol1/brick1 force gluster volume start gfsvol1 gluster volume info gfsvol1 gluster volume status gfsvol1 gluster volume heal gfsvol1 # add to /etc/fstab vi /etc/fstab virt1:/gfsvol2 /virt-gfs glusterfs defaults,noatime,_netdev 0 0 mkdir /virt-gfs mount -a All work fine but when I start or restart all server together glusterd server start but if I try mount the volume, gluster is not working. At this point if I restart the glusterd service and run "mount -a" all work fine. Seem is a boot network problem Then I have try modify glusterd.service with $ sudo systemctl edit glusterd.service --full And modify the unit in this way: #old < After=network.target < Before=network-online.target #new > After=network.target network-online.target > #Before=network-online.target Now all work fine, mostly when I start or restart all server together. There is another solution or this is a Bug? Many thanks for your suggest -- Dario Lesca (inviato dal mio Linux Fedora 32 Workstation)

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Discuss October 2020