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Show only error messages in the system journal

harmless rootLogsdebian, ubuntu
Adjust the values, the command updates live
root@server
journalctl -p err -b --no-pager

Shows all messages since the current boot with priority err or more urgent (crit, alert, emerg). This filters out the everyday noise and leaves the entries that really need attention. Using warning as the priority includes warnings as well.

Also searched as

  • show only errors in system log
  • journalctl show errors
  • critical messages since reboot
  • what errors occurred since boot

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Show journal logs for a single service

#journalctl -u nginx -n 200 --no-pager
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Show logs from the previous boot

#journalctl -b -1 -n 200 --no-pager
harmlessLogs

Show system logs since a specific time

#journalctl --since "1 hour ago" --no-pager
harmlessLogs

Analyze server errors (5xx) in the access log

#awk '$9 ~ /^5[0-9][0-9]$/ {print $9, $7}' /var/www/vhosts/system/example.com/logs/access_ssl_log | sort | uniq -c | sort -rn | head -20
harmlessLogs

Follow a log file live and filter by keywords

#tail -f /var/log/syslog | grep --line-buffered -iE "error|warn|fail"
harmlessLogs

Follow the error log of a Plesk domain live

#tail -f /var/www/vhosts/system/example.com/logs/error_log
harmlessLogs

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