How to get a Docker container's IP address from the host

Question

Is there a command I can run to get the container's IP address right from the host after a new container is created?

Basically, once Docker creates the container, I want to roll my own code deployment and container configuration scripts.

Answer 1

The --format option of inspect comes to the rescue.

Modern Docker client syntax is:

docker inspect -f '{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' container_name_or_id

Old Docker client syntax is:

docker inspect --format '{{ .NetworkSettings.IPAddress }}' container_name_or_id

These commands will return the Docker container's IP address.

As mentioned in the comments: if you are on Windows, use double quotes " instead of single quotes ' around the curly braces.

Answer 2

You can use docker inspect <container id>.

For example:

CID=$(docker run -d -p 4321 base nc -lk 4321);
docker inspect $CID

Answer 3

First get the container ID:

docker ps

(First column is for container ID)

Use the container ID to run:

docker inspect <container ID>

At the bottom,under "NetworkSettings", you can find "IPAddress"

Or Just do:

docker inspect <container id> | grep "IPAddress"

Answer 4

docker inspect CONTAINER_ID | grep "IPAddress"

You can add -i to grep for ignoring the case then even the following will work:

docker inspect CONTAINER_ID | grep -i "IPaDDreSS"

Answer 5

To get all container names and their IP addresses in just one single command.

docker inspect -f '{{.Name}} - {{.NetworkSettings.IPAddress }}' $(docker ps -aq)

If you are using docker-compose the command will be this:

docker inspect -f '{{.Name}} - {{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' $(docker ps -aq)

The output will be:

/containerA - 172.17.0.4
/containerB - 172.17.0.3
/containerC - 172.17.0.2

Answer 6

Add this shell script in your ~/.bashrc or relevant file:

docker-ip() {
  docker inspect --format '{{ .NetworkSettings.IPAddress }}' "$@"
}

Then, to get an IP address of a container, simply do this:

docker-ip YOUR_CONTAINER_ID

For the new version of the Docker, please use the following:

docker-ip() {
        docker inspect --format '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' "$@"
}

Answer 7

In Docker 1.3+, you can also check it using:

Enter the running Docker (Linux):

docker exec [container-id or container-name] cat /etc/hosts
172.17.0.26 d8bc98fa4088
127.0.0.1   localhost
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
172.17.0.17 mysql

For windows:

docker exec [container-id or container-name] ipconfig

Answer 8

Show all container's IP addresses:

docker inspect --format='{{.Name}} - {{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' $(docker ps -aq)

Answer 9

As of Docker version 1.10.3, build 20f81dd

Unless you told Docker otherwise, Docker always launches your containers in the bridge network. So you can try this command below:

docker network inspect bridge

Which should then return a Containers section which will display the IP address for that running container.

[
    {
        "Name": "bridge",
        "Id": "40561e7d29a08b2eb81fe7b02736f44da6c0daae54ca3486f75bfa81c83507a0",
        "Scope": "local",
        "Driver": "bridge",
        "IPAM": {
            "Driver": "default",
            "Options": null,
            "Config": [
                {
                    "Subnet": "172.17.0.0/16"
                }
            ]
        },
        "Containers": {
            "025d191991083e21761eb5a56729f61d7c5612a520269e548d0136e084ecd32a": {
                "Name": "drunk_leavitt",
                "EndpointID": "9f6f630a1743bd9184f30b37795590f13d87299fe39c8969294c8a353a8c97b3",
                "IPv4Address": "172.17.0.2/16",
                "IPv6Address": ""
            }
        },
        "Options": {
            "com.docker.network.bridge.default_bridge": "true",
            "com.docker.network.bridge.enable_icc": "true",
            "com.docker.network.bridge.enable_ip_masquerade": "true",
            "com.docker.network.bridge.host_binding_ipv4": "0.0.0.0",
            "com.docker.network.bridge.name": "docker0",
            "com.docker.network.driver.mtu": "1500"
        }
    }
]

Answer 10

Execute:

docker ps -a

This will display active docker images:

CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                       PORTS               NAMES
3b733ae18c1c        parzee/database     "/usr/lib/postgresql/"   6 minutes ago       Up 6 minutes                 5432/tcp            serene_babbage

Use the CONTAINER ID value:

docker inspect <CONTAINER ID> | grep -w "IPAddress" | awk '{ print $2 }' | head -n 1 | cut -d "," -f1

"172.17.0.2"

Answer 11

Based on some of the answers I loved, I decided to merge them to a function to get all the IP addresses and another for an specific container. They are now in my .bashrc file.

docker-ips() {
    docker inspect --format='{{.Name}} - {{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' $(docker ps -aq)
}

docker-ip() {
  docker inspect --format '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' "$@"
}

The first command gives the IP address of all the containers and the second a specific container's IP address.

docker-ips
docker-ip YOUR_CONTAINER_ID

Answer 12

Here's a quick working answer:

Get your container name or ID:

docker container ls

Then get the IP:

docker inspect <container_ID Or container_name> |grep 'IPAddress'

Get the port:

docker inspect <container_ID Or container_name> |grep 'Port'

Answer 13

I wrote the following Bash script to get a table of IP addresses from all containers running under docker-compose.

function docker_container_names() {
    docker ps -a --format "{{.Names}}" | xargs
}

# Get the IP address of a particular container
dip() {
    local network
    network='YOUR-NETWORK-HERE'
    docker inspect --format "{{ .NetworkSettings.Networks.$network.IPAddress }}" "$@"
}

dipall() {
    for container_name in $(docker_container_names);
    do
        local container_ip=$(dip $container_name)
        if [[ -n "$container_ip" ]]; then
            echo $(dip $container_name) " $container_name"
        fi
    done | sort -t . -k 3,3n -k 4,4n
}

You should change the variable network to your own network name.

Answer 14

Reference containers by name:

docker run ... --name pg-master

Then grab the IP address address by name:

MASTER_HOST=$(docker inspect --format '{{ .NetworkSettings.IPAddress }}' pg-master)

Answer 15

Docker is written in Go and it uses Go syntax for query purposes too.

To inspect the IP address of a particular container, you need to run the command (-f for "format"):

docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' container_id_or_name

For the container ID or name, you can run the command

docker container ls

which will list every running container.

Answer 16

My answer:

docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}} %tab% {{.Name}}' $(docker ps -aq
) | sed 's#%tab%#\t#g' | sed 's#/##g' | sort -t . -k 1,1n -k 2,2n -k 3,3n -k 4,4n

Also as a bash alias:

docker-ips() {   docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}} %tab% {{.Name}}' $(docker ps -aq) | sed 's#%tab%#\t#g' | sed 's#/##g' | sort -t . -k 1,1n -k 2,2n -k 3,3n -k 4,4n }

Output is sorted by IP address, and tab delimited:

# docker-ips
172.18.0.2       memcached
172.18.0.3       nginx
172.18.0.4       fpm-backup
172.18.0.5       dns
172.18.0.6       fpm-beta
172.18.0.7       exim
172.18.0.8       fpm-delta
172.18.0.9       mariadb
172.18.0.10      fpm-alpha
172.19.0.2       nextcloud-redis
172.19.0.3       nextcloud-db
172.19.0.4       nextcloud

Answer 17

Here's is a solution that I developed today in Python, using the docker inspect container JSON output as the data source.

I have a lot of containers and infrastructures that I have to inspect, and I need to obtain basic network information from any container, in a fast and pretty manner. That's why I made this script.

IMPORTANT: Since the version 1.9, Docker allows you to create multiple networks and attach them to the containers.

#!/usr/bin/python

import json
import subprocess
import sys

try:
    CONTAINER = sys.argv[1]
except Exception as e:
    print "\n\tSpecify the container name, please."
    print "\t\tEx.:  script.py my_container\n"
    sys.exit(1)

# Inspecting container via Subprocess
proc = subprocess.Popen(["docker","inspect",CONTAINER],
                      stdout=subprocess.PIPE,
                      stderr=subprocess.STDOUT)

out = proc.stdout.read()
json_data = json.loads(out)[0]

net_dict = {}
for network in json_data["NetworkSettings"]["Networks"].keys():
    net_dict['mac_addr']  = json_data["NetworkSettings"]["Networks"][network]["MacAddress"]
    net_dict['ipv4_addr'] = json_data["NetworkSettings"]["Networks"][network]["IPAddress"]
    net_dict['ipv4_net']  = json_data["NetworkSettings"]["Networks"][network]["IPPrefixLen"]
    net_dict['ipv4_gtw']  = json_data["NetworkSettings"]["Networks"][network]["Gateway"]
    net_dict['ipv6_addr'] = json_data["NetworkSettings"]["Networks"][network]["GlobalIPv6Address"]
    net_dict['ipv6_net']  = json_data["NetworkSettings"]["Networks"][network]["GlobalIPv6PrefixLen"]
    net_dict['ipv6_gtw']  = json_data["NetworkSettings"]["Networks"][network]["IPv6Gateway"]
    for item in net_dict:
        if net_dict[item] == "" or net_dict[item] == 0:
            net_dict[item] = "null"
    print "\n[%s]" % network
    print "\n{}{:>13} {:>14}".format(net_dict['mac_addr'],"IP/NETWORK","GATEWAY")
    print "--------------------------------------------"
    print "IPv4 settings:{:>16}/{:<5}  {}".format(net_dict['ipv4_addr'],net_dict['ipv4_net'],net_dict['ipv4_gtw'])
    print "IPv6 settings:{:>16}/{:<5}  {}".format(net_dict['ipv6_addr'],net_dict['ipv6_net'],net_dict['ipv6_gtw'])

The output is:

$ python docker_netinfo.py debian1

[frontend]

02:42:ac:12:00:02   IP/NETWORK        GATEWAY
--------------------------------------------
IPv4 settings:      172.18.0.2/16     172.18.0.1
IPv6 settings:            null/null   null

[backend]

02:42:ac:13:00:02   IP/NETWORK        GATEWAY
--------------------------------------------
IPv4 settings:      172.19.0.2/16     172.19.0.1
IPv6 settings:            null/null   null

Answer 18

I use this simple way

docker exec -it <container id or name> hostname -i

e.g

ubuntu@myhost:~$ docker exec -it 3d618ac670fe hostname -i
10.0.1.5

Answer 19

docker inspect --format '{{ .NetworkSettings.IPAddress }}' <containername or containerID here>

The above works if the container is deployed to the default bridge network.

However, if using a custom bridge network or a overlay network, I found the below to work better:

docker exec <containername or containerID here> /sbin/ifconfig eth0 | grep 'inet addr:' | cut -d: -f2 | awk '{ print $1}'

Answer 20

To extend ko-dos' answer, here's an alias to list all container names and their IP addresses:

alias docker-ips='docker ps | tail -n +2 | while read -a a; do name=${a[$((${#a[@]}-1))]}; echo -ne "$name\t"; docker inspect $name | grep IPAddress | cut -d \" -f 4; done'

Answer 21

NOTE!!! for Docker Compose Usage:

Since Docker Compose creates an isolated network for each cluster, the methods below do not work with docker-compose.

---

The most elegant and easy way is defining a shell function, currently the most-voted answer @WouterD's:

dockip() {
  docker inspect --format '{{ .NetworkSettings.IPAddress }}' "$@"
}

Docker can write container IDs to a file like Linux programs:

Running with --cidfile=filename, Docker dumps the ID of the container to "filename".

See "Docker runs PID equivalent Section" for more information.

--cidfile="app.cid": Write the container ID to the file

Using a PID file:

1. Running container with --cidfile parameter, the app.cid file content is like:

   a29ac3b9f8aebf66a1ba5989186bd620ea66f1740e9fe6524351e7ace139b909
   

2. You can use file content to inspect Docker containers:

   blog-v4 git:(develop) ✗ docker inspect `cat app.cid`
   

3. You can extract the container IP using an inline Python script:

   $ docker inspect `cat app.cid` | python -c "import json;import sys;\
   sys.stdout.write(json.load(sys.stdin)[0]['NetworkSettings']['IPAddress'])"
   172.17.0.2
   

Here's a more human friendly form:

#!/usr/bin/env python
# Coding: utf-8
# Save this file like get-docker-ip.py in a folder that in $PATH
# Run it with
# $ docker inspect <CONTAINER ID> | get-docker-ip.py

import json
import sys

sys.stdout.write(json.load(sys.stdin)[0]['NetworkSettings']['IPAddress'])

See "10 alternatives of getting the Docker container IP addresses" for more information.

Answer 22

Combining previous answers with finding the container ID based on the Docker image name:

docker inspect --format '{{ .NetworkSettings.IPAddress }}' `docker ps | grep $IMAGE_NAME | sed 's/\|/ /' | awk '{print $1}'`

Answer 23

If you installed Docker using Docker Toolbox, you can use the Kitematic application to get the container IP address:

1. Select the container
2. Click on Settings
3. Click in Ports tab.

Answer 24

To get the IP address and host port of a container:

docker inspect containerId | awk '/IPAddress/ || /HostPort/'

Output:

    "HostPort": "4200"
                    "HostPort": "4200"
        "SecondaryIPAddresses": null,
        "IPAddress": "172.17.0.2",
                "IPAddress": "172.17.0.2",

Answer 25

Just for completeness:

I really like the --format option, but at first I wasn't aware of it so I used a simple Python one-liner to get the same result:

docker inspect <CONTAINER> |python -c 'import json,sys;obj=json.load(sys.stdin);print obj[0]["NetworkSettings"]["IPAddress"]'

Answer 26

For windows 10:

docker inspect --format "{{ .NetworkSettings.IPAddress }}"  containerId

Answer 27

Docker inspect use to print all container ips and its respective names

docker ps -q | xargs -n 1 docker inspect --format '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}} {{ .Name }}' | sed 's/ \// /'

Answer 28

For those who came from Google to find a solution for command execution from the terminal (not by a script), "jid", which is an interactive JSON drill-down utility with autocomplete and suggestion, lets you do the same thing with less typing.

docker inspect $CID | jid

Type Tab .Net Tab and you'll see something like:

[Filter]> .[0].NetworkSettings
{
  "Bridge": "",
  "EndpointID": "b69eb8bd4f11d8b172c82f21ab2e501fe532e4997fc007ed1a997750396355d5",
  "Gateway": "172.17.0.1",
  "GlobalIPv6Address": "",
  "GlobalIPv6PrefixLen": 0,
  "HairpinMode": false,
  "IPAddress": "172.17.0.2",
  "IPPrefixLen": 16,
  "IPv6Gateway": "",
  "LinkLocalIPv6Address": "",
  "LinkLocalIPv6PrefixLen": 0,
  "MacAddress": "02:42:ac:11:00:02",
  "Networks": {
    "bridge": {
      "Aliases": null,
      "EndpointID": "b69eb8bd4f11d8b172c82f21ab2e501fe532e4997fc007ed1a997750396355d5",
      "Gateway": "172.17.0.1",
      "GlobalIPv6Address": "",

Type .IPA Tab and you'll see something like:

[Filter]> .[0].NetworkSettings.IPAddress
"172.17.0.2"

Answer 29

Use:

docker inspect $CID | grep IPAddress | grep -v null| cut -d '"' -f 4 | head -1

Answer 30

This will list down all the container IPs on the host:

sudo docker ps -aq | while read line;  do sudo docker inspect -f '{{.Name}} - {{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' $line ; done