How to check last boot's systemd journal log in CentOS 7 Linux?

The command to check last boot's journal log shows nothing on CentOS 7:

# journalctl -b -1

Failed to look up boot -1: No such boot ID in journal

Is the log stored and where it is?

related to an answer for: How to make journalctl faster?
asked Jun 8, 2017 by anonymous

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