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journalctl.md

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journalctl

Useful options

journalctl -f  # Follow output
journalctl -b  # Show log entries since boot

Combining

# Logical AND
journalctl _SYSTEMD_UNIT=avahi-daemon.service _PID=28097

# Using the same field twice makes it a logical OR
journalctl _SYSTEMD_UNIT=avahi-daemon.service _SYSTEMD_UNIT=dbus.service

# Use `+' as logical OR
journalctl _SYSTEMD_UNIT=avahi-daemon.service _PID=28097 + _SYSTEMD_UNIT=dbus.service

Filters

journalctl _PID=1200     # Filter by process ID
journalctl _UID=1000     # Filter by user ID
journalctl _COMM=sshd    # Filter by command

List available values for a given filter:

journalctl -F _PID

Filter by log level

journalctl -p <level>, where <level> is one of:

  1. emerg
  2. alert
  3. crit
  4. err
  5. warning
  6. notice
  7. info
  8. debug

Filter by time period

journalctl --since=2012-10-15 --until="2012-10-16 23:59:59"
journalctl --since="10:00" --until="11:00"

Filter by pathname

# filter by executeable name
journalctl /usr/bin/dbus-daemon

# show logs of kernel device nodes
journalctl /dev/sda

Filter by identifier

Filter by the syslog identifier (name in the short format)

journalctl -t systemd
journalctl --itentifier systemd
journalctl SYSLOG_IDENTIFIER=systemd

Filter by specific systemd unit

journalctl -u dbus
journalctl --unit tomcat.service
journalctl _SYSTEMD_UNIT=tomcat.service