1. 启动pm2应用
    [root@gitlab ~]``#pm2 start verdaccio
    [PM2] Starting ``/opt/node/bin/verdaccio in fork_mode (1 instance)
    [PM2] Done.
    ┌───────────┬────┬─────────┬──────┬───────┬────────┬─────────┬────────┬─────┬───────────┬──────┬──────────┐
    │ App name │ ``id │ version │ mode │ pid │ status │ restart │ uptime │ cpu │ mem │ user │ watching │
    ├───────────┼────┼─────────┼──────┼───────┼────────┼─────────┼────────┼─────┼───────────┼──────┼──────────┤
    │ verdaccio │ 0 │ N``/A │ fork │ 11128 │ online │ 0 │ 0s │ 0% │ 15.0 MB │ root │ disabled │
    └───────────┴────┴─────────┴──────┴───────┴────────┴─────────┴────────┴─────┴───────────┴──────┴──────────┘

    2.保存pm2应用列表

    [root@gitlab ~]``# pm2 save
    [PM2] Saving current process list...
    [PM2] Successfully saved ``in /root/``.pm2``/dump``.pm2

    3.将pm2设置为Centos systemctl服务

    [root@gitlab ~]``# pm2 startup > init_pm2.sh
    Created ``symlink from ``/etc/systemd/system/multi-user``.target.wants``/pm2-root``.service to ``/etc/systemd/system/pm2-root``.service.

    4.设置服务开机启动

    systemctl ``enable pm2-root