this post was submitted on 26 Mar 2024
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22
Maximum number of docker networks (lemm.ee)
submitted 8 months ago by rambos@lemm.ee to c/selfhosted@lemmy.world
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Hey guys, I was happily running 44 docker containers for a while on Debian host. Today I tried to add a new service (uptime-kuma) using portainer stacks, but I got this error:

Error response from daemon: could not find an available, non-overlapping IPv4 address pool among the defaults to assign to the network

Quick google led me to this link where I found possible problem with max number of docker networks. I did docker network prune, it removed 5 networks that were not in use and viola, uptime-kuma is working now!

Am I reaching the limit? What to do if I need 10 more services on the same host? I bet I saw some people in this community running many more services

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[–] Markaos@lemmy.one 4 points 8 months ago (2 children)

I'm pretty sure all of those entries are in the same /12 network - 172.16.0.0/12. Apparently there's nothing wrong with it, but I think you can significantly simplify that config by just removing all the extra ones

[–] timbuck2themoon@sh.itjust.works 6 points 8 months ago* (last edited 8 months ago) (1 children)

Could simplify it by making a 28 block at most. That is 14 IPs per bridge which seems like way more than one would generally need anyhow.

{
  "default-address-pools": [
    { "base":"172.16.0.0/12", "size":28 },
  ]
}
[–] 5PACEBAR@lemmy.world 3 points 8 months ago

Had to do exactly that last week when I hit Docker's rather low network limit.