this post was submitted on 18 Oct 2023
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How to prevent rogue docker containers from wreaking havoc? (alien.top)
submitted 1 year ago by jschwalbe@alien.top to c/main@selfhosted.forum
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There was a recent post about whether to enable ufw and it made me ask: how protected I am from a rogue docker container? I have a single server with 15-20 docker containers running at any given time. Should one get hacked or be malicious from the get go, are there (hopefully easy to implement for an armchair sysadmin) best practices to mitigate such an event? Thanks!

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[–] PaulEngineer-89@alien.top 1 points 1 year ago (1 children)

The thing about containers is they usually have no NÉED in general for pure ope file system access. No need for full network access (host, LAN, WAN). So the smaller the privileges the better. So even if it is compromised there’s very little you can do with it.

This is also a general principle for network management. For instance when does the TV need to print or access any server other than Jellyfin?

[–] ElevenNotes@alien.top 1 points 1 year ago

This is not true sorry. Even in k8s any container has access to any other container in the same pod or in dockers case on the same host. In k8s you can at least add network profiles. If its a host or MACVLAN container it gets worse if no proper isolation is configured on the network level.