How to change the network used by Docker?

By default, Docker virtualization system uses 172.17.0.0/16 networks for its operation. If your equipment uses addresses from these networks, you can change the Docker settings. This will prevent possible network conflicts.

Viewing the information about the networks used

To find out which networks are used by Docker:

1. Request the list of networks:

   docker network list

   An example of response

   NETWORK ID     NAME            DRIVER    SCOPE
   d6d21035109b   bridge          bridge    local
   5ce30744fbb4   host            host      local
   d20b27b805a0   none            null      local
   21e7a8920b7f   vm_vm_box_net   bridge    local

    In the response to the command, the NAME column will show the names of the networks used.

2. For each network request the information about the address space used:

   docker network inspect <network_name> | grep Subnet
   

   Comments to the command

   <network_name> — network name in the NAME column

Changing the network for Docker

To change the settings of networks used by Docker:

1. Edit or create the /etc/docker/daemon.json file:

   An example of file

   {
   	"live-restore": true,
   	"bip": "10.10.0.1/16",
   	"default-address-pools": [{
   		"base": "10.0.0.0/8",
   		"size": 16
   	}]
   }

   Comments to the file format

   live-restore — this parameter helps reduce container downtime when the system is shut down or rebooted.

   bip — IP address of Docker's bridge-interface in the format "address/network prefix". For example, to use the IP address 10.10.0.1 in a 10.10.0.0/16 network, specify "10.10.0.1/16".

   base — the range of IP addresses for creating Docker networks in the format "network/network prefix". E.g., "10.0.0.0/8".

   size — prefix of networks being created.

2.  Delete all running docker containers:

   docker rm -f `docker ps -q -a`

3. Delete all unused Docker objects:

   docker system prune

   docker network prune

4. Restart the Docker service: 

   systemctl restart docker

5. Run VMmanager:

   vm start

6. Reboot the server with VMmanager:

   reboot

7. For each network request the information about the address space used:

   docker network inspect <network_name> | grep Subnet

   Comments to the command

   <network_name> — network name