Comment on What steps do you take to secure your server and your selfhosted services?

Chewy7324@discuss.tchncs.de ⁨3⁩ ⁨weeks⁩ ago

• ocean@lemmy.selfhostcat.com ⁨3⁩ ⁨weeks⁩ ago

  Does adding 127.0.0.1 make it so only that server can access it or what? I’ve seen that but not understand

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  • Chewy7324@discuss.tchncs.de ⁨2⁩ ⁨weeks⁩ ago

    127.0.0.0 is the localhost. This is the IP the container is listening on. Even if there was no firewall it wouldn’t allow any connection except from the host. If it’s set to 0.0.0.0 it means it’ll allow connections from any IP (which might not be an issue depending on your setup).

    The reverse proxy runs on localhost anyway, so any other IPs have no reason to ever have access.

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    • ocean@lemmy.selfhostcat.com ⁨2⁩ ⁨weeks⁩ ago

      Yes. 127.0.0.0 is the localhost. This is the IP the container is listening on. Even if there was no firewall it wouldn’t allow any connection except from the host. If it’s set to 0.0.0.0 it means it’ll allow connections from any IP (which might not be an issue depending on your setup).

      Thanks for explaining this!

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• ikidd@lemmy.world ⁨3⁩ ⁨weeks⁩ ago

  I assume #2 is just to keep containers/stacks able to talk to each other without piercing the firewall for ports that aren’t to be exposed to the outside? It wouldn’t prevent anything if one of the containers on that host were compromised, afaik.

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  • MangoPenguin@lemmy.blahaj.zone ⁨3⁩ ⁨weeks⁩ ago

    Containers can talk to each other without any ports exposed at all, they just need to be added to the same docker network.

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    • ikidd@lemmy.world ⁨3⁩ ⁨weeks⁩ ago

      I was getting more at stacks on a host talking, ie: you have a postgres stack with PG and Pgadmin, but want to use it with other stacks or k8s swarm, without exposing the pg port outside the machine.

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      • MangoPenguin@lemmy.blahaj.zone ⁨3⁩ ⁨weeks⁩ ago

        You can do that by joining the containers to the same docker network, you don’t need to expose ports even to localhost.

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  • Chewy7324@discuss.tchncs.de ⁨3⁩ ⁨weeks⁩ ago

    It’s mostly to allow the reverse proxy on localhost to connect to the container/service, while blocking all other hosts/IPs.

    This is especially important when using docker as it messes with iptables and can circumvent firewall like e.g. ufw.

    You’re right that it doesn’t increase security on case of a compromised container. It’s just about outside connections.

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    • ikidd@lemmy.world ⁨3⁩ ⁨weeks⁩ ago

      OK, yah, that’s what I was getting at.

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