Assign static IP to Docker container

Question

I'm now trying to assign a static IP 172.17.0.1 when a Docker container be started up.

I use port 2122 as the ssh port of this container so that I let this container listen port 2122.

sudo docker run -i -t -p 2122:2122 ubuntu

This command will run a Docker container with a random IP like 172.17.0.5, but I need to assign a specific IP to the container.

The following shell script is what I reference Docker documentation in advanced network settings.

pid=$(sudo docker inspect -f '{{.State.Pid}}' <container_name> 2>/dev/null)
sudo rm -rf /var/run/netns/*
sudo ln -s /proc/$pid/ns/net /var/run/netns/$pid
sudo ip link add A type veth peer name B
sudo brctl addif docker0 A
sudo ip link set A up
sudo ip link set B netns $pid
sudo ip netns exec $pid ip link set eth0 down
sudo ip netns exec $pid ip link delete eth0
sudo ip netns exec $pid ip link set dev B name eth0
sudo ip netns exec $pid ip link set eth0 address 12:34:56:78:9a:bc
sudo ip netns exec $pid ip link set eth0 down
sudo ip netns exec $pid ip link set eth0 up
sudo ip netns exec $pid ip addr add 172.17.0.1/16 dev eth0
sudo ip netns exec $pid ip route add default via 172.17.42.1

This shell script will assign a static IP 172.17.0.1 and link to the world fine. But whenever I try to ssh to this container from my local, it didn't work. What's the problem possibly I met?

Answer 1

Easy with Docker version 1.10.1, build 9e83765.

First you need to create your own docker network (mynet123)

docker network create --subnet=172.18.0.0/16 mynet123

then, simply run the image (I'll take ubuntu as example)

docker run --net mynet123 --ip 172.18.0.22 -it ubuntu bash

then in ubuntu shell

ip addr

Additionally you could use

• --hostname to specify a hostname
• --add-host to add more entries to /etc/hosts

Docs (and why you need to create a network) at https://docs.docker.com/engine/reference/commandline/network_create/