![]() ![]() You can read this as “wait until we have everything ready for a multiples user system.” Targets in systemd are like the old run levels and can be used to put your machine into one state or another, or, like here, to tell your service to wait until a certain state has been reached. ![]() You do all that by adding a new section and directive to your unit: Likewise, the rvice uses a user’s email (among other things) and will have to be slotted in when the network is up and services for regular users become available. For example the rvice, the service for the Common UNIX Printing System, will have to be brought up after the network framework is activated, but before any other printing services are enabled. In systemd parlance, installing means telling systemd when in the boot sequence should your service become activated. To do that you need to enable your service, but, before you can do that, you have to tell systemd where to install it. The next step is to make your service start when you boot up and stop when you power down your computer. You could also use your personal user and that would be a bit better, but what many administrators do is create a specific user for each service, effectively isolating the service from the rest of the system and users. You could use root, but that would probably be a security hazard. The User directive tells systemd which user’s environment it should use to correctly run the service. You can solve this problem by adding the User directive to your unit:ĮxecStartPost= /home//bin/mtsendmail.sh "Ready to rumble?"ĮxecStop= /home//bin/mtsendmail.sh "Off to bed. This is because systemd does not have any context, no links to worlds, textures, configuration files, or details of the specific user running the service. If you were to try and run the service now, it would have to be with superuser privileges:īut, what’s more, if you check your service’s status with Sudo mv /home//.config/systemd/user/rvice /etc/systemd/system/ Start be moving your service out to where the system services live, The directory youa re looking for is /etc/systemd/system/: The next step is to make your service available as soon as the machine boots up, and close down when you switch it off at night. Likewise when you are about to close down, but giving two minutes to users to log off. The service will start up the Minetest server and send out an email to your users. $MAINPID is a systemd variable for your service that points to the PID of the main application. That is what you do when you issue the kill -2 $MAINPID command. Minetest likes to be closed down with +, which translates into an interrupt signal ( SIGINT). With that in mind, the first thing you do is shoot off an email to your friends, warning them the server is going down. They will be executed in order, from topmost to bottommost, and will allow you to send out a message before the server is actually stopped. Although there is no ExecStopPre as such, you can simulate running stuff before closing down your server by using more than one ExecStop directive. This will stop systemd from thinking the closedown has failed. But, as you want to give your users a couple of minutes before closing the server completely, you are going to push the default up to three minutes. Anything longer, and systemd will force the service to close down and report a failure. The default time out value is round about 90 seconds. The TimeoutStopSec directive pushes up the time before systemd bails on shutting down the service. Next up, you have a block of commands that close down the server. Although the script shown above is to all practical effects only one line long, remember you can’t have a line with pipes and redirections as a systemd unit argument, so you have to wrap it in a script.įor the record, there is also an ExecStartPre directive for things you want to execute before starting the service proper. In this case, you run a custom script, mtsendmail (see below), that sends an email to your friends telling them that the server is up.Įcho $1 | mutt -F /home//.muttrc -s "$2" can use Mutt, a command-line email client, to shoot off your messages. You can use this directive for anything you want to run right after the main application starts. First, there’s the ExecStartPost directive. Let’s jazz it up a bit by having it send out emails to the players, alerting them when the server becomes available and warning them when it is about to be turned off:ĮxecStartPost= /home//bin/mtsendmail.sh "Ready to rumble?" "Minetest Starting up"ĮxecStop= /home//bin/mtsendmail.sh "Off to bed. As it stands, however, your service is still not much better than running the server directly. In the previous article, we showed how to create a systemd service that you can run as a regular user to start and stop your game server. ![]()
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