永久更改docker bridge IP

Question

I am trying to configure dockerd to use the bridge ip 172.31.0.1/24 (as i understand it must be a subnet). I configured the file /etc/docker/daemon.json as follows:

{   "dns": ["8.8.8.8", "8.8.4.4"]}
{  "bip": "172.31.1.1/24",
  "ipv6": false}

Then i did systemctl stop docker && systemctl start docker It didn't work :-/ Can you pls help me set up this bridge subnet permanently? Most help online is on temporary setting, not my interest.

I also changed the file /etc/default/docker , but it does not seem to make a difference on systems running on systemd.

Ubuntu 16.04, Docker version 17.12.1-ce, build 7390fc6

Answer 1

Your /etc/docker/daemon.json is not correct right now. Literally it contains two JSON structures inside:

{   "dns": ["8.8.8.8", "8.8.4.4"]}

and

{  "bip": "172.31.1.1/24",
  "ipv6": false}

When you start/restart docker on your host it reads JSON structure from /etc/docker/daemon.json ie only the first part of it. That's why IP changes are not applied.

The correct /etc/docker/daemon.json is:

{ 
  "dns": ["8.8.8.8", "8.8.4.4"], 
  "bip": "172.30.1.1/24",
  "ipv6": false
}