There are many ways to manage the lifetime of a container. Many times this comes down to the complexity of the application or system being deployed.
Other times, you need to bootstrap a container to launch the rest of your system.
In this scenario, we'll explain how to use Systemd to launch and manage containers when your system boots. This environment is running a CoreOS instance, however, applies to other Systemd based OSes.
In this scenario we explored how to use Systemd to manage the starting Docker containers.
You can view the unit file used at https://gist.github.com/BenHall/b31e7778dbc4ed612dbcf40acccbf1df
With Systemd, all services have a unit file. A unit file defines how Systemd should manage the service. It will generally include:
System dependencies and services which must be running
Tasks to perform before launching
How to start the process
How to stop process
How to restart the process if it crashes
When using Systemd to launch Docker containers the service file manages the processes via the Docker CLI. You can see the example of starting Postgres here cat postgres.service
Knowing what you need to know is the hardest part. Our guided pathways help build your knowledge around real-world scenarios.
The best way to learn is by doing. All our tutorials are interactive with pre-configured live environments ready for you to use.
It's a competitive industry. Your skills need to keep up with the latest approaches. Katacoda keeps your skills up-to-date.
Knowing what you need to know is the hardest part. Our guided pathways help build your knowledge around real-world scenarios.
The best way to learn is by doing. All our tutorials are interactive with pre-configured live environments ready for you to use.
It's a competitive industry. Your skills need to keep up with the latest approaches. Katacoda keeps your skills up-to-date.