journalctl: Where are the old logs?

SUSE Linux Enterprise Server SLES Configure-Administer
1

When use journalctl to check the log I found it back until the last boot. Even --list-boots show only one boot.
Where are the older log entrys? (Need to know why the host does a restart.)

2

[QUOTE=ELzAR;59637]When use journalctl to check the log I found it back until the last boot. Even --list-boots show only one boot.
Where are the older log entrys? (Need to know why the host does a restart.)[/QUOTE]
Hi
You need to set the journal to be persistent in the configuration, see https://documentation.suse.com/sles/12-SP3/html/SLES-all/cha-journalctl.html

There are other option as well like rsyslog etc.

The other option is to ssh from another machine and follow the journal, then if it reboots you will see the last messages on the terminal since it will loose it’s ssh connection.