Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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No. Docker containers aren't a full sandbox. There's a number of exploits that can break out of a container and gain root access to the host.
Rootless podman helps
Yes and no
Breaking out of docker in a real life context would require either a massive misconfiguration or a major security vulnerability. Chances are you aren't going to have much in the way of lateral movement but it is always good to have defense in depth.
If someone's self-hosting, I'd be willing to bet they don't have the same hardened config or isolation that a cloud provider would.
Docker restricts the permissions of software running in the container. It is hardened by default and you need to manually grant permissions in some rare cases.