Add Services

Systemd

Within the server, many applications will run as services. Those can be started and stopped using systemctl. You may want to add some new services that you can manage that way. You can achieve it by doing as follows:

/bin/systemctl daemon-reload
/bin/systemctl enable {appname}.service

The second line may not work with all applications, so you may have to write a file named {appname}.service under /etc/systemd/system/. The file may look as follows:

[Unit]
Description={shortDescription}

[Service]
Type=simple
User={userToRunTheApp}
Group={groupToRunTheApp}
ExecStart={pathToBinary}
Restart=on-failure
RestartSec=3
StartLimitBurst=3
StartLimitInterval=60
WorkingDirectory=/

[Install]
WantedBy=multi-user.target

More information on ShellHacks and the systemd manual.

Vesta

After having added a service to systemd, it is also possible to add it to the Vesta console and monitor as well as manage the service from its web UI. To achieve that, follow these steps:, assuming we are adding example as a service:

1. add the service to systemd
2. Add EXAMPLE_SYSTEM='example' as a line in /usr/local/vesta/config/vesta.conf
3. Add the following in /usr/local/vesta/bin/v-list-sys-servicesunder "Action"

## Checking EXAMPLE system
if [ ! -z "$EXAMPLE_SYSTEM" ] && [ "$EXAMPLE_SYSTEM" != 'remote' ]; then
    get_srv_state $EXAMPLE_SYSTEM
    data="$data\nNAME='$EXAMPLE_SYSTEM' SYSTEM='example application' STATE='$state'"
    data="$data CPU='$cpu' MEM='$mem' RTIME='$rtime'"
fi

4. if the correct status is not displayed in Vesta, you may also add the following in the same file under "searching related pids"

if [ "$name" = 'example' ]; then
    pids=$(systemctl show example --property=MainPID | sed 's/MainPID=//')
    status=$(systemctl show example --property=SubState | sed 's/SubState=//')
    if [ "$status" = 'dead' ]; then
        state='stopped'
    fi
fi

5. To be able to modify the service's configuration through vesta, you should add the following in /usr/local/vesta/bin/v-change-sys-service-config under "Defining dst config path"

case $service in
    example)    dst='{pathToConfigFile}'
esac