![]() ![]() WantedBy= is the target that this unit is a part of. systemd will think the process has exited and the unit will be stopped.ĮxecStop= is the action systemd will run when the unit should be stopped. Do not run docker containers with -d as this will prevent the container from starting as a child of this pid. The pid assigned to this process is what systemd will monitor to determine whether the process has crashed or not. You can define as many of these as you want.ĮxecStartPre= is the action to run before starting the main process, using the - prefix you can ignore failures.ĮxecStart= allows you to specify any command that you’d like to run when this unit is started. ![]() Write something that will help you understand exactly what this does later on.Īfter=rvice and Requires=rvice means this unit will only start after rvice is active. The Description shows up in the systemd log and a few other places. Let’s create a simple unit named rvice:ĮxecStartPre= -/usr/bin/docker rm -force busybox1ĮxecStart= /usr/bin/docker run -name busybox1 -pull always busybox /bin/sh -c "trap 'exit 0' INT TERM while true do echo Hello World sleep 1 done" On Flatcar Container Linux, unit files are located at /etc/systemd/system. Running systemctl enable foo.service creates symlinks to the unit inside. This is specified in the unit file by WantedBy=multi-user.target. The target that you’ll interact with is the multi-user.target which holds all of the general use unit files for our containers.Įach target is actually a collection of symlinks to our unit files. Systemd is the first process started on Flatcar Container Linux and it reads different targets and starts the processes specified which allows the operating system to start. This happens at every boot as processes are started at different run levels. A target is a grouping mechanism that allows systemd to start up groups of processes at the same time. This is normally a docker run command or something similar. A unit is a configuration file that describes the properties of the process that you’d like to run. Systemd consists of two main concepts: a unit and a target. Within Flatcar Container Linux, you will almost exclusively use systemd to manage the lifecycle of your Docker containers. Systemd is an init system that provides many powerful features for starting, stopping, and managing processes. ![]() Guide to building custom Flatcar images from source ![]()
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