How to get IP address of running docker container

Question

I am using Docker for Mac  I am running a nodejs based microservice in a Docker container  I want to test node microservice through the browser  How to get IP address of running docker container

User · Answer

For my case  below worked on Mac    I could not access container IPs directly on Mac  I need to use localhost with port forwarding  e g  if the port is 8000  then http   localhost 8000  See https   docs docker com docker-for-mac networking  known-limitations-use-cases-and-workarounds  The original answer was from  https   github com docker for-mac issues 2670 issuecomment-371249949

User · Answer

You can start your container with the flag -P  This  assigns  a random port to the exposed port of your image   With docker port  lt container id gt  you can see the randomly choosen port  Access is then possible via localhost port

User · Answer

Use --format option to get only the IP address instead whole container info    sudo docker inspect --format      NetworkSettings IPAddress      lt CONTAINER ID gt

User · Answer

if you want to obtain it right within the container  you can try   ip a   grep -oE   b  0-9  1 3     3  0-9  1 3  b    grep 172 17

User · Answer

while read ctr do     sudo docker inspect --format  quot  ctr  quot     Name      NetworkSettings IPAddress      ctr done  lt   lt  docker ps -a --filter status running --format     ID

User · Answer

If you don t want to map ports from your host to the container you can access directly to the docker range ip for the container  This range is by default only accessed from your host  You can check your container network data doing   docker inspect  lt containerNameOrId gt    Probably is better to filter   docker inspect  lt containerNameOrId gt    grep   IPAddress     head -n 1   Usually  the default docker ip range is 172 17 0 0 16  Your host should be 172 17 0 1 and your first container should be 172 17 0 2 if everything is normal and you didn t specify any special network options   EDIT Another more elegant way using docker features instead of  bash tricking    docker inspect -f      NetworkSettings IPAddress      lt containerNameOrId gt

User · Answer

You can not access the docker s IP from outside of that host machine  If your browser is on another machine better to map the host port to container port by passing -p 8080 8080 to run command   Passing -p you can map host port to container port and a proxy is set to forward all traffix for said host port to designated container port

User · Answer

For modern docker engines use this command    docker inspect -f    range  NetworkSettings Networks     IPAddress    end    container name or id   and for older engines use    docker inspect --format      NetworkSettings IPAddress     container name or id

[docker] How to get IP address of running docker container

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