Useful Slurm Commands from Laura H.

    squeue -A halld,halld-production
​    squeue -A halld,halld-production -t r
​    squeue -A halld,halld-production -t r -w farm1997

Weird Problem with MariaDB Server: Won’t Start

Trying to start MariaDB server, Fedora 34, get the following error:

# systemctl start mariadb
.
.
.
Jul 07 11:47:59 markdesk5.itodomain systemd[1]: mariadb.service: Main process exited, code=exited, status=1/FAILURE
Jul 07 11:47:59 markdesk5.itodomain systemd[1]: mariadb.service: Failed with result 'exit-code'.
Jul 07 11:47:59 markdesk5.itodomain systemd[1]: Failed to start MariaDB 10.5 database server.

See this in /var/log/mariadb/mariadb.log:

2021-07-07 11:47:59 0 [ERROR] mariadbd: Can't create/write to file '/run/mariadb/mariadb.pid' (Errcode: 2 "No such file or directory")
2021-07-07 11:47:59 0 [ERROR] Can't start server: can't create PID file: No such file or directory

Fixed as follows (as root):

cd /run
mkdir mariadb
chgrp mysql mariadb
chmod g+w mariadb

Don’t know why that directory disappeared.

Drupal Migration Meeting, May 21, 2019

• May 21, 2019
• Zisis, Sherman, Kari, MMI
• meeting 4 months to discuss upgrade drupal 7 -> 8
• drupal 7 unsupported in 1.3 years from now
• Sherman will install drush after meeting
• Zisis will send his notes on drush to Sherman
• drupal security upgrades will be done regularly on maintenance days

Persistent VNC Session

VNC session :1 always reported as being present although nothing extant in ~/.vnc folder. vncserver refused to create a :1 session. Solution below.

lorentz:marki:.vnc> vncserver

Warning: lorentz.jlab.org:1 is taken because of /tmp/.X11-unix/X1
Remove this file if there is no X server lorentz.jlab.org:1

New 'lorentz.jlab.org:2 (marki)' desktop is lorentz.jlab.org:2

Starting applications specified in /home/marki/.vnc/xstartup
Log file is /home/marki/.vnc/lorentz.jlab.org:2.log


lorentz:marki:.vnc> cd /tmp/.X11-unix/
lorentz:marki:.X11-unix> lsl
total 8
drwxrwxrwt.  2 root  root      33 Jan 22 08:27 ./
drwxrwxrwt. 26 root  root    4096 Jan 22 08:27 ../
srwxrwxrwx   1 root  root       0 Jan 22 08:20 X0=
srwxrwxrwx   1 root  root       0 Jan 18 07:16 X1=
srwxrwxrwx   1 marki halld-2    0 Jan 22 08:27 X2=
lorentz:marki:.X11-unix> sudo rm -v X1
[sudo] password for marki: 
removed 'X1'

ldconfig needed after dropping a shared library into a system directory

 

NAME
       ldconfig - configure dynamic linker run-time bindings

SYNOPSIS
       /sbin/ldconfig  [  -nNvXV ] [ -f conf ] [ -C cache ] [ -r root ] direc-
       tory ...
       /sbin/ldconfig -l [ -v ] library ...
       /sbin/ldconfig -p

DESCRIPTION
       ldconfig creates the necessary links  and  cache  to  the  most  recent
       shared  libraries  found  in  the  directories specified on the command
       line, in the file /etc/ld.so.conf, and in the trusted directories (/lib
       and  /usr/lib).  The cache is used by the run-time linker, ld.so or ld-
       linux.so.  ldconfig checks the header and filenames of the libraries it
       encounters  when  determining  which  versions  should have their links
       updated.

Trick to get Lorentz Going after Reboot

systemctl restart ypbind