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     lt container name gt  2 gt  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

User · Answer

This works for me   Create a network with docker network create --subnet 172 17 0 0 16 selnet  Run docker image docker run --net selnet --ip 172 18 0 2 hub  At first  I got   docker  Error response from daemon  Invalid address 172 17 0 2  It does not belong to any of this network s subnets  ERRO 0000  error waiting for container  context canceled   Solution  Increased the 2nd quadruple of the IP    18  instead of  17

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For docker-compose you can use following docker-compose yml  version   2  services    nginx      image  nginx     container name  nginx-container     networks        static-network          ipv4 address  172 20 128 2 networks    static-network      ipam        config          - subnet  172 20 0 0 16            docker-compose v3  do not use ip range           ip range  172 28 5 0 24   from host you can test using   docker-compose up -d curl 172 20 128 2   Modern docker-compose does not change ip address that frequently    To find ips of all containers in your docker-compose in a single line use   for s in  docker-compose ps -q   do echo ip of  docker inspect -f     Name     s  is  docker inspect -f    range  NetworkSettings Networks     IPAddress    end     s   done   If you want to automate  you can use something like this example gist

User · Answer

You can set the IP while running it   docker run --cap-add NET ADMIN -dit imagename  bin sh -c   sbin ip addr add 172 17 0 12 dev eth0  bash    See my example at https   github com RvdGijp mariadb-10 1-galera

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You can access other containers  service by their name ping apachewill get the ip or curl http   apache would access the http service  And this can be a alternative of a static ip

User · Answer

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

User · Answer

If you want your container to have it s own virtual ethernet socket  with it s own MAC address   iptables  then use the Macvlan driver   This may be necessary to route traffic out to your ISPs router   https   docs docker com engine userguide networking get-started-macvlan

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I stumbled upon this problem during attempt to dockerise Avahi which needs to be aware of its public IP to function properly  Assigning static IP to the container is tricky due to lack of support for static IP assignment in Docker   This article describes technique how to assign static IP to the container on Debian    Docker service should be started with DOCKER OPTS  --bridge br0 --ip-masq false --iptables false   I assume that br0 bridge is already configured  Container should be started with --cap-add NET ADMIN --net bridge Inside container pre-up ip addr flush dev eth0 in  etc network interfaces can be used to dismiss IP address assigned by Docker as in following example      auto lo iface lo inet loopback  auto eth0 iface eth0 inet static     pre-up ip addr flush dev eth0     address 192 168 0 249     netmask 255 255 255 0     gateway 192 168 0 1    Container s entry script should begin with  etc init d networking start  Also entry script needs to edit or populate  etc hosts file in order to remove references to Docker-assigned IP

User · Answer

Not a direct answer but it could help   I run most of my dockerized services tied to own static ips using the next approach    I create ip aliases for all services on docker host Then I run each service redirecting ports from this ip into container so each service have own static ip which could be used by external users and other containers    Sample   docker run --name dns --restart always -d -p 172 16 177 20 53 53 udp dns docker run --name registry --restart always -d -p 172 16 177 12 80 5000 registry docker run --name cache --restart always -d -p 172 16 177 13 80 3142 -v  data cache  var cache apt-cacher-ng cache docker run --name mirror --restart always -d -p 172 16 177 19 80 80 -v  data mirror  usr share nginx html ro mirror

[docker] Assign static IP to Docker container

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