CODEWITHSUNDEEP
python-3.xdockerdocker-composesubprocessdocker-network
Vic
Vic

Reputation: 33

Docker SDK: Look up a container's IP address?

I have two Docker containers. Container One is named 5extraextranodes_plc1_1, and is run with docker-compose on a bridge network named test_net.

Container 2 is built and run outside of docker-compose. In container 2, there is a Python3 script. Inside this Python3 script, I want to be able to look up the 5extraextranodes_plc1_1 container's IP address.

I originally tried to use subprocess.checkout() inside the Python code to run the docker inspect -f '{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' 5extraextranodes_plc1_1 command. But that gave me an error FileNotFoundError: [Errno 2] No such file or directory: 'docker'.

So now I am trying to do this using Docker SDK inside of my Python 3.6 script. I'm running the following code:

    client = docker.from_env()
    container = client.containers.list(filters={"name": "5extraextranodes_plc1_1"})
    ip_add = container.attrs['NetworkSettings']['IPAddress']

Unfortunately, this code gives me the error: docker.errors.DockerException: Error while fetching server API version: ('Connection aborted.', FileNotFoundError(2, 'No such file or directory')) for the statement client = docker.from_env().

How can I look up the 5extraextranodes_plc1_1 container's IP address from Container 2 on the same network?

Note: I am currently running Container 2 on the network test_net (same network as Container 1). I've also tried running it in network host mode. Both fail.

Upvotes: 0

Views: 441

Answers (1)

araisch
araisch

Reputation: 1940

If you do not want to use a common network and Docker DNS like stated by @larsks:

By default containers are not allowed to change stuff on host system, this is a core concept of docker. But you're able to explicitly allow access to docker sock:

docker run -v /var/run/docker.sock:/var/run/docker.sock container2

But keep in mind: This container gains superpower and should be secured very well if necessary.

If you have further problems please provide Dockerfile from container2

Upvotes: 0

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