Create interactions.md

guide/interactions.md

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+## Interacting with other containers and services
+
+Here are three ways to interact with other containers or services within your Docker Swarm or Kubernetes cluster.
+
+
+## Option 1 - host port
+
+Bind a port to the host and use the host's IP / DNS-entry in the function
+
+## Option 2 - Swarm service
+
+If you are creating a new container such as MySQL then you can create a swarm service and simply specify the network as an additional parameter. That makes it resolvable via DNS and doesn't require a host to be exposed on the host.
+
+```
+docker service create --name redis --network=func_functions redis:latest
+```
+ 
+## Option 3 - attachable network
+
+Go to your docker-compose YAML file and uncomment the last line which says "attachable". Now delete and re-deploy OpenFaaS (this must remove func_functions from `docker network ls`). Now when you re-create you can use `docker run --name redis --net=func_functions redis:latest`.
+