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How many docker containers are you running on your server? (slrpnk.net)

submitted 3 days ago* (last edited 2 days ago) by [email protected] to c/[email protected]

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Yo,

Wandering what the limit is when it comes to how many containers I can run. Currently I'm running around 15 containers. What happens if this is increased to say, 40? Also, can docker containers go "idle" when not being used - to save system resources?

I'm running a i7-6700k Intel cpu. Doesn't seem to be struggling at all with my current setup at least, maybe only when transcoding for Jellyfin.

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[–] [email protected] 3 points 3 days ago

You can't really make them go idle, save by restarting them with a do-nothing command like tail -f /dev/null. What you probably want to do is scale a service down to 0. This leaves the declaration that you want to have an image deployed as a container, "but for right now, don't stand any containers up".

If you're running a Kubernetes cluster, then this is pretty straightforward: just edit the deployment config for the service in question to set scale: 0. If you're using Docker Compose, I believe the value to set is called replicas and the default is 1.

As for a limit to the number of running containers, I don't think it exists unless you're running an orchestrator like AWS EKS that sets an artificial limit of... 15 per node? I think? Generally you're limited only by the resources availabale, which means it's a good idea to make sure that you're setting limits on the amount of RAM/CPU a container can use.