emqx4.3/deploy/packages/emqx.service

[Unit]
Description=emqx daemon
After=network.target

[Service]
User=emqx
Group=emqx

# The ExecStart= is foreground, so 'simple' here
Type=simple
Environment=HOME=/var/lib/emqx

# Enable logging to file
Environment=EMQX_LOG__TO=default

# Start 'foregroun' but not 'start' (daemon) mode.
# Because systemd monitor/restarts 'simple' services
ExecStart=/bin/bash /usr/bin/emqx foreground

# Give EMQX enough file descriptors
LimitNOFILE=1048576

# ExecStop is commented out so systemd will send a SIGTERM when 'systemctl stop'.
# SIGTERM is handled by EMQX and it then performs a graceful shutdown
# It's better than command 'emqx stop' because it needs to ping the node
# ExecStop=/bin/bash /usr/bin/emqx stop

# Wait long enough before force kill for graceful shutdown
TimeoutStopSec=120s

Restart=on-failure

# Do not restart immediately so the peer nodes in the cluster have
# enough time to handle the 'DOWN' events of this node
RestartSec=120s

[Install]
WantedBy=multi-user.target