this post was submitted on 28 Jul 2023
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26
Why do some of my containers register their hostname with my DHCP server, but others don't? (lemmy.world)
submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/[email protected]
16 comments fedilink hide all child comments
 

...and more importantly, where is that setting stored so I can turn it on for all of them?

I realize this varies according to OS, so I'm specifically asking about my Turnkey Nextcloud and Turnkey Mediaserver containers, which are based on Debian Linux. It's perhaps worth noting that my Turnkey Syncthing container, which uses the same base OS, does register its hostname with my DHCP server. I've gone digging around in /etc/ etc. in each of the containers, but so far I haven't found any configuration differences that would explain the difference in behavior. (Also, if it matters, my DHCP server is the one included with OpenWRT and running on my router.)

By the way, I'm aware that the best answer might be "you have an X/Y problem and you really ought to use static IPs and/or setup a reverse proxy," but I haven't gotten to that point yet. Besides, I still want to satisfy my curiosity about DHCP and hostnames regardless.

EDIT: to be clear, this post is about LXC containers running directly in Proxmox, NOT Docker.

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[–] [email protected] 6 points 1 year ago (1 children)

You can pass hostnames in docker compose easily with

hostname: myhostname

Sometimes you can use container names too

container_name: myapp

It is that easy ☺️

[–] [email protected] 3 points 1 year ago* (last edited 1 year ago) (1 children)

I'm asking about LXC containers, not Docker containers.

[–] [email protected] 6 points 1 year ago* (last edited 1 year ago) (1 children)

Okay this is easy too to set a hostname on debian or ubuntu Container:

hostnamectl set-hostname myname

[–] [email protected] 3 points 1 year ago (1 children)

root@syncthing ~# hostnamectl status
Failed to connect to bus: No such file or directory

[–] [email protected] 4 points 1 year ago

Try this

apt-get install libpam-systemd

Restart LXC afterwards and try again. Let me know if it works now 🐱