okay
it's show like this :
dmesg|grep -iE "kill|httpd|apache|http|mysql|oom"
grep -i 'killed' /var/log/messages
journalctl | grep -i 'killed'
[3284987.466836] systemd-sysv-generator[3566373]: SysV service '/etc/init.d/mysqld' lacks a native systemd unit file, automatically generating a unit file for compatibility.
[3454979.468152] systemd-sysv-generator[3702990]: SysV service '/etc/init.d/mysqld' lacks a native systemd unit file, automatically generating a unit file for compatibility.
[3454980.414838] systemd-sysv-generator[3703071]: SysV service '/etc/init.d/mysqld' lacks a native systemd unit file, automatically generating a unit file for compatibility.
[3454980.912056] systemd-sysv-generator[3703159]: SysV service '/etc/init.d/mysqld' lacks a native systemd unit file, automatically generating a unit file for compatibility.
[3603920.163473] systemd-sysv-generator[3838416]: SysV service '/etc/init.d/mysqld' lacks a native systemd unit file, automatically generating a unit file for compatibility.
[3603927.387305] systemd-sysv-generator[3838636]: SysV service '/etc/init.d/mysqld' lacks a native systemd unit file, automatically generating a unit file for compatibility.
[3801083.536413] systemd-sysv-generator[3988604]: SysV service '/etc/init.d/mysqld' lacks a native systemd unit file, automatically generating a unit file for compatibility.
grep: /var/log/messages: No such file or directory
Jul 26 05:27:33 live systemd[1]: pm2-root.service: The kernel OOM killer killed some processes in this unit.
Jul 26 05:27:33 live kernel: Out of memory: Killed process 2211424 (next-server (v1) total-vm:16765608kB, anon-rss:4287008kB, file-rss:2840kB, shmem-rss:0kB, UID:0 pgtables:62260kB oom_score_adj:0
Jul 27 05:12:38 live systemd[1]: pm2-root.service: The kernel OOM killer killed some processes in this unit.
Jul 27 05:12:38 live kernel: Out of memory: Killed process 2525376 (next-server (v1) total-vm:18102260kB, anon-rss:4630544kB, file-rss:2636kB, shmem-rss:0kB, UID:0 pgtables:62072kB oom_score_adj:0