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
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
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 }, ] }Had to do exactly that last week when I hit Docker’s rather low network limit.
Good point!