How to enable persistent logging for the systemd journal？

https://access.redhat.com/solutions/696893

 SOLUTION 已验证 - 已更新 2019年一月18日00:39 - 

English 

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:

Raw

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

With storage option "persistent", data will be stored preferably on disk, i.e. below the /var/log/journal hierarchy (which is created if needed), with a fallback to /run/log/journal (which is created if needed), during early boot and if the disk is not writable.

根源

• By default in Red Hat Enterprise Linux 7 and 8, systemd is not configured to maintain logs persistently