How to enable persistent logging for the systemd journal？

​

环境

• Red Hat Enterprise Linux 7
• Red Hat Enterprise Linux 8

问题

• The ​

  ​systemd​

  ​ journal is configured by default to store logs only in a small ring-buffer in ​

  ​/run/log/journal​

  ​, which is not persistent
• Journal database logs do not survive a system reboot

决议

• Configure ​

  ​systemd​

  ​ to persistently store journal logs in ​

  ​/var/log/journal​

  ​ by running the following commands.

​​Raw​​

# mkdir -p /var/log/journal
      

• You may decide if you need to keep or remove the ​

  ​rsyslog​

  ​ package installed on the system at this point, depending on your requirements
• See ​

  ​man journalctl​

  ​ for more information on querying the journal database for specific logs

Instead of manually creating the /var/log/journal directory, one can also change the systemd-journald configuration file:

# sed -i 's/#Storage=auto/Storage=persistent/' /etc/systemd/journald.conf
# systemctl restart systemd-journald.service
      

根源

• By default in Red Hat Enterprise Linux 7 and 8, ​

  ​systemd​

  ​ is not configured to maintain logs persistently