CODEWITHSUNDEEP
dockervolumes
yogmk
yogmk

Reputation: 185

Two docker container need volumes from each other

Docker: Reciprocating volumes

I am creating two containers running 2 different applications. Container A, exposes 2 directories say /opt/appA and /home/userA/runtime. Both are needed to be referred to by container B (--volumes-from A). B in turn should expose a volume /home/userB/runtime, which container A needs (--volumes-from B) when it starts.

Q. is how to achieve this? Because when I start/run container 'A', container 'B' does not yet exist (--volumes-from B does not work) and vice versa for B.

Is there a way out of this?

Upvotes: 3

Views: 255

Answers (1)

VonC
VonC

Reputation: 1324073

Simply create separate volumes (and use them in A and B) with the docker 1.9 docker volume create command.

That way, A and B can mount those volumes when they are launched.
One volume can be mounted (-v) by multiple containers.

$ docker volume create --name optA
optA

$ docker run --name=A -d -v optA:/opt/appA busybox ls /opt/appA
$ docker run --name=B -d -v optA:/opt/appA busybox ls /opt/appA

No more --volume-from needed.

Upvotes: 2

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