How to increase maximum Docker Network on one server?

Question

In my computer, I can create more maximum 29 Docker Network, like that.

for num in `seq -w 100`; do
    echo "Create network: $num"
    docker network create $num
done

After creating 29 Docker Network, I get error:

Error response from daemon: failed to parse pool request for address space "LocalDefault" pool "" subpool "": could not find an available predefined netw
ork

My Question: How to increase maximum Docker Network on one server?

Because I used to test many docker-compose should require more network.

Thank you.

Answer 1

For every network, docker reserves a private IP pool and reserves a range of IP addresses.

Private address range is defined here(https://en.wikipedia.org/wiki/Private_network).

Docker uses following pool:

172.17.0.0/16 - 172.31.0.0/16 - 15

192.168.0.0/20 - 192.168.224.0/20 - 15

Default bridge network takes up 1. Thats why you see the limit at 29. This limit does not apply for other networks like overlay.