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

# log to file by default (if no log handler config)
Environment=EMQX_DEFAULT_LOG_HANDLER=file

# Start 'foreground' 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
# emqx stop will ping node, always return 0 to make sure next command will be executed
ExecStop=/bin/bash -c '/usr/bin/emqx stop; exit 0'
# If the process is still running, force kill it
ExecStop=/bin/bash -c 'if [ ps -p $MAINPID >/dev/null 2>&1 ]; then kill -15 $MAINPID; fi'

# 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