CODEWITHSUNDEEP
docker
Jan Wy
Jan Wy

Reputation: 1569

Is it possible to link existing containers with docker?

Can I create a container using docker run <image> without the --link option and link other containers to it afterwards? If so, how do I link these containers then?

Upvotes: 9

Views: 7526

Answers (2)

xeor
xeor

Reputation: 5455

Thats how you normally would do it. Fire up container A and start container B with --link B:resourcename. Inside container B, you can now get to the stuff container A EXPOSEs, with the info you can see inside the environment-variables env (they will be named something with resourcename in this case.

You can not do this the other way around (as I thought your question was originally about). The information the container needs to get to resources on the other is available as environment-variables. Which you cant inject into a running process (as far as I know..).

Upvotes: 3

edwardsbean
edwardsbean

Reputation: 3759

Of course yes,but you can only access other containers by ip (usually 172.17.1.x). You can use 

docker inspect container_id

to find other containers ip.

Upvotes: 0

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