Verify persistent storage is enabled journalctl

If /var/log/journal is absent, logs are volatile and lost on reboot. fix: mkdir + systemd-tmpfiles

journalctl --header | grep -iE 'file|state'; ls -d /var/log/journal 2>/dev/null || echo volatile

#journalctl #disk #troubleshooting

more journalctl all 12 commands →

Filter by priority error and above journalctl -p err -b --no-pager Match by raw systemd unit field journalctl _SYSTEMD_UNIT=sshd.service --since today Combine field filters with OR journalctl _PID=1 + _COMM=sshd -o short-iso Regex grep across messages journalctl --grep='oom|out of memory' --case-sensitive=false -b Verbose output with all fields journalctl -u <name> -o verbose -n 1