[Linux](EN) Check systemd log using journalctl
Briefly review about journalctl
Environment and Prerequisite
- Linux base system
- Bash shell(/bin/bash)
What is journalctl?
journalctl
- systemd log is called
journal
. journalctl
query logs of systemd.
![](https://upload.wikimedia.org/wikipedia/commons/thumb/3/35/Systemd_components.svg/660px-Systemd_components.svg.png)
Examples
Basic Usage
- Use journalctl command with options
journalctl [OPTIONS...] [MATCHES...]
Example - Check end of journals with explanatory explanations(errors or events)
- Use
-xe
option
journalctl -xe
Example - Check specific unit journals
- Use
-u
option
journalctl -u [systemd unit name]
Example - Keep tracking journals
- Use
-f
option
journalctl -f