Docker is a high level framework for Linux containers which could be next level for virtualising applications and VM’s. Some times it is require to get ip address of a docker so that you can try to check a service running on it or try to ssh at 22 port on the IP address assigned to docker container.

This post will show you how to get ip address of a running container. To get IP address of a running docker container we should use “docker inspect” command and filter it out with filtering tools like awk etc. First we should know what is the name of docker you want to get IP address.

 Surendra-MacBook-Pro in ~

○ → docker ps

CONTAINER ID        IMAGE                           COMMAND             CREATED             STATUS              PORTS                          NAMES

7f1f2fb7f0a4        linuxnix/puppetmaster:latest   “/sbin/my_init”     3 hours ago         Up About an hour    8140/tcp, 0.0.0.0:22->22/tcp   puppet_master

From the above output the name of the docker running on the machine is “puppet_master”

Now use docker inspect with some filtering commands to get the IP

	docker inspect <container_name>

Example:

Surendra-MacBook-Pro in ~

○ → docker inspect puppet_master | awk -F ‘”‘ ‘/IPAdd/ {print $4}’

172.17.0.8

If you are in the docker container we can use “ip a”  to list interfaces

root@1937100e11d2:/# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
13: eth0@if14: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
link/ether 02:42:ac:11:00:02 brd ff:ff:ff:ff:ff:ff link-netnsid 0
inet 172.17.0.2/16 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::42:acff:fe11:2/64 scope link
valid_lft forever preferred_lft forever
root@1937100e11d2:/#

We can use docker inspect and filter for network setting using below command as well.

surendra@sanne-taggle:~/code/sh/test$ docker inspect --format '{{ .NetworkSettings.IPAddress }}' 1937100e11d2
172.17.0.2

 

Now we can use this IP address to whatever work you want.

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Surendra Anne

Mr Surendra Anne is from Vijayawada, Andhra Pradesh, India. He is a Linux/Open source supporter who believes in Hard work, A down to earth person, Likes to share knowledge with others, Loves dogs, Likes photography. He works as Devops Engineer with Taggle systems, an IOT automatic water metering company, Sydney . You can contact him at surendra (@) linuxnix dot com.