PM2 systemd unit file - under SCL

pm2-myuser.service

# put this into /etc/systemd/system/pm2-myuser.service , then `systemctl daemon-reload`
# `myuser` should be replaced with your username and `ExecXXX` params adjusted to relevant paths.

# This systemd unit file will spawn nodejs PM2 process manager.
# It's an adapted version of `pm2 startup` and contains proper things to use with latest systemd.

# This one uses nodejs from SCL (centos/redhat software collections) and allows you to get rid of error:
# systemd[1]: New main PID XXX does not belong to service, and PID file is not owned by root. Refusing.
# If you don't use SCL, just adjust `ExecXXX` params accordingly.


[Unit]
Description=PM2 process manager (%N)
Documentation=https://pm2.keymetrics.io/
After=network.target

[Service]
Type=forking

User=myuser

SyslogIdentifier=%N

LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity

Environment=PM2_HOME=/home/myuser/.pm2

PIDFile=/home/myuser/.pm2/pm2.pid

Restart=on-failure
RestartSec=1m


ExecStart=/usr/bin/scl enable rh-nodejs12 -- /home/myuser/pm2/bin/pm2 resurrect
ExecReload=/usr/bin/scl enable rh-nodejs12 -- /home/myuser/pm2/bin/pm2 reload all
ExecStop=/usr/bin/scl enable rh-nodejs12 -- /home/myuser/pm2/bin/pm2 kill


[Install]
WantedBy=multi-user.target