Docker uses the default 172.17.0.0/16
subnet for container networking.
This will become a problem if you use the same subnet for your local network.
To change the default subnet on the docker0
interface with systemd
(CentOS 7), create the following directory:
$ sudo mkdir -p /etc/systemd/system/docker.service.d/
Create the configuration file /etc/systemd/system/docker.service.d/override.conf
with the following content:
[Service] ExecStart= ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock --bip 172.200.0.1/16
Where 172.200.0.1/16
is your new Docker subnet.
Reload systemd manager configuration:
$ sudo systemctl daemon-reload
Restart Docker service:
$ sudo systemctl restart docker.service
Verify:
$ ip addr show dev docker0 4: docker0:mtu 1500 qdisc noqueue state DOWN group default link/ether 02:42:c8:21:8c:19 brd ff:ff:ff:ff:ff:ff inet 172.200.0.1/16 brd 172.200.255.255 scope global docker0 valid_lft forever preferred_lft forever