Java项目突然挂掉

查看 Java 进程日志

sudo dmesg -T | grep "(java)" 

[root@VM-0-5-centos jar]# sudo dmesg -T | grep "(java)"
[Fri May  6 19:31:49 2022] Out of memory: Kill process 5175 (java) score 223 or sacrifice child
[Fri May  6 19:31:49 2022] Killed process 5175 (java), UID 0, total-vm:3647080kB, anon-rss:892680kB, file-rss:0kB, shmem-rss:0kB
[Sat May  7 10:39:18 2022] Out of memory: Kill process 22349 (java) score 241 or sacrifice child
[Sat May  7 10:39:18 2022] Killed process 22349 (java), UID 0, total-vm:3909556kB, anon-rss:963280kB, file-rss:0kB, shmem-rss:0kB
[Sat May  7 10:39:18 2022] Out of memory: Kill process 14309 (java) score 221 or sacrifice child
[Sat May  7 10:39:18 2022] Killed process 14309 (java), UID 0, total-vm:3700392kB, anon-rss:882980kB, file-rss:0kB, shmem-rss:0kB

没内存，杀掉了 Java 进程，该充钱升级了

或者查看系统日志文件也可以

tail -n 100 /var/log/messages

[root@VM-0-5-centos ~]# tail -n 100 /var/log/messages
May  7 10:39:20 VM-0-5-centos kernel: Out of memory: Kill process 14309 (java) score 221 or sacrifice child
May  7 10:39:20 VM-0-5-centos kernel: Killed process 14309 (java), UID 0, total-vm:3700392kB, anon-rss:882980kB, file-rss:0kB, shmem-rss:0kB
May  7 10:39:20 VM-0-5-centos systemd-logind: Removed session 536815.
May  7 10:39:20 VM-0-5-centos systemd-logind: Removed session 226291.
May  7 10:40:01 VM-0-5-centos systemd: Started Session 538133 of user root.
May  7 10:40:01 VM-0-5-centos systemd: Started Session 538135 of user root.