journalctl 사용법
how to use journalctl
view basic log
$ journalctl
7월 29 16:25:57 VirtualBox systemd-journald[214]: Runtime journal (/run/log/journal/) is 8.0M, max 80.9M, 72.9M free.
7월 29 16:25:57 VirtualBox kernel: Initializing cgroup subsys cpuset
7월 29 16:25:57 VirtualBox kernel: Initializing cgroup subsys cpu
7월 29 16:25:57 VirtualBox kernel: Initializing cgroup subsys cpuacct
7월 29 16:25:57 VirtualBox kernel: Linux version 4.4.0-116-generic (buildd@lgw01-amd64-023) (gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.9) ) #140-Ubuntu SMP Mon Feb 12 21:22:43 UTC 2018 (Ubuntu 4.4.0-116.140-generic 4.4.98)
7월 29 16:25:57 VirtualBox kernel: KERNEL supported cpus:
7월 29 16:25:57 VirtualBox kernel: Intel GenuineIntel
view current boot log
$ journalctl -b
view specific time log
$ journalctl --since "2019-01-10" --until "2019-01-11 03:00"
view log by service
$ journalctl -u [service name]
tail log
$ journalctl -u [service name] -f
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