By default the systemd journal on RHEL may live only in memory. In that case journald writes to /run/log/journal/, a directory on a temporary file system that is emptied at every boot, so journalctl -b -1 (the previous boot) returns nothing. That makes it hard to investigate a crash or a failed boot after the fact. Making the journal persistent means storing it on disk in /var/log/journal/, and it is a standard RHCSA task.
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