When deploying container, as time grows and we deployed many containers. We will met this ERROR: could not find an available, non-overlapping IPv4 address pool among the defaults to assign to the network. The default network address poll defined by is pretty small, roughly only 32 bridge network can be used. After 32 network bridge consumed we will meet this error, there is some way we can do, first is clean up our docker installation, docker network prune this command will clean up unused network "if you have any". Second, is to add docker network pool, how? By modifying docker config, /etc/docker/daemon.json. If you already had docker daemon config before just adding the lines under your current config will do, if this the first time then you can create the json file.

# nano /etc/docker/daemon.json

Add few lines off networks, you can also keep adding the networks such as 172.19.0.0/16

{
  "default-address-pools": [
   {"base":"172.17.0.0/16","size":16},
   {"base":"172.18.0.0/16","size":16},
   ]
}

If you had some config before please add the comma , after it first. After adding the lines you can restart the docker daemon # systemctl restart docker.service, on some cases container may get error due network rebuilding, you can use docker compose down - up combo or remove all container, clean up network and redeploy again, as long as the data intact the container will work like it used to be.

sources:

• Docker Github
• Increase Docker IP Space