Docker Swarm Linking

Question

I'm trying to create a Docker Swarm Cluster running an elastic search instance, a MongoDB instance and a grails app, each on a separate machine.

I'm trying to run the following command

docker run -p 8080:8080 -d --name grails-master --volumes-from maven --link mongo:mongo-master --link es:es-master my-grails-image

But its throwing the following error

Error response from daemon: Unable to find a node fulfilling all dependencies: --volumes-from=maven --link=mongo:mongo-master --link=es:es-master

Answer 1

Linking in docker is complicated and difficult. There is another way to go about this, try it

Just create an overlay network for swarm mode.

docker network create -d overlay mynetwork

In swarm mode, just add every service who should communicate with another service to the same network.

docker service create --network mynetwork --name mymongodb ...

Other services in the same network can reach your mongodb service just over the hostname mymongodb.