Linux: SystemD

List all running services

sytemctl
watch "ps -ef|grep service"

Start/stop or enable/disable services

systemctl start foo.service
systemctl stop foo.service
systemctl restart foo.service
systemctl status foo.service
systemctl enable foo.service
systemctl disable foo.service

Check if service is enabled

systemctl is-enabled foo.service; echo $?

Source: Useful SystemD Commands

Log to syslog

Use the following properties in your systemd service unit file:

StandardOutput=syslog
StandardError=syslog
SyslogIdentifier=<your program identifier> # without any quote

Then, assuming your distribution is using rsyslog to manage syslogs, create a file in /etc/rsyslog.d/<new_file>.conf with the following content:

if $programname == '<your program identifier>' then /path/to/log/file.log
if $programname == '<your program identifier>' then ~

/etc/systemd/system/example.service

[Unit]
 Description=Tenkaichi Vegeta-server (Tentacle)
 After=network.target
 
 [Service]
 User=tenkaichi
 Group=tenkaichi
 WorkingDirectory=/home/tenkaichi/vegetas-server
 EnvironmentFile=/tenkaichi/vegeta-server/cfg/environment.cfg
 StandardOutput=syslog
 StandardError=syslog
 SyslogIdentifier=Vegeta-Tentacle
 Restart=always
 RestartSec=3
 
 ExecStart=/usr/local/bin/tentacle_server -o -a ${SERVER_IP} -p ${PORT} -s ${INPUT_DIR} -v -m ${MAX_SIZE} \
   -e ${SSL_CERT} -k ${SSL_CERTKEY}
 
 [Install]
 WantedBy=multi-user.target
 

Automatic restart

Add the following lines to your service file at Service block

[Service]
...
Restart=always
RestartSec=3
...

Wait Online

[Unit]
 Wants=network-online.target
 After=network.target network-online.target

With NetworkManager

systemctl enable NetworkManager-wait-online

ExecStart examples

Gunicorn

ExecStart=/virtualenv/path/bin/gunicorn -w3 --timeout 300 --access-logfile /var/log/gunicorn/app-access.log --error-logfile /var/log/gunicorn/app-error.log --bind unix:/sockets/app-socket.sock App.wsgi

Flask (superset)

ExecStart=/home/superset/.virtualenvs/superset/bin/gunicorn -w 3 -k gevent --timeout 120 -b unix:/home/superset/.superset/superset.sock --limit-request-line 0 --limit-request-field_size 0 --statsd-host localhost:8125 superset:app