Add: docker network article to guide (#22484)

* Add: docker network article to guide * grammar corrections
2018-11-25 01:11:00 +01:00
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--- a/guide/english/docker/docker-network/index.md
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+---
+title: Docker Network
+---
+
+By design containers are isolated from the host and other running containers. The virtual networking of Docker containers allows them to talk to services inside other containers or on the host.
+
+By default, every container gets a virtual Ethernet interface that gets connected via a bridge on the host.
+
+## List all Docker networks
+
+`docker network ls` lists all current Docker networks. 
+
+When installing Docker it creates three default networks:
+
+- *bridge*:  
+Default for containers that are run without a network specified
+- *host*:  
+Allows a container to directly use the network stack of the host
+- *none*:  
+No networking to other containers is possible
+
+You can use these, but when you plan on running your service containers in production it is advised to create special networks.
+
+## Inspect a Docker Network
+
+`docker network inspect NAMEOFNETWORK` outputs details on the configuration of the network in JSON format. For example, the containers that are part of the network, or their private IPv4-adresses.
+
+```json
+"Containers": {
+            "156693991b505f5c17ae524ee31fe18775e62011db816cce5313cd2f22576a9c": {
+                "Name": "app",
+                "EndpointID": "ac4d2dff6f2191fa22749d6c00a2005f400ee74771e0e9186ffa35c94f9b9994",
+                "MacAddress": "02:42:ac:18:00:02",
+                "IPv4Address": "172.24.0.2/16",
+                "IPv6Address": ""
+            },
+            "64b4328f46a7c4f26e925b66cd6783dc024a93210e958b768292427e52b35bf3": {
+                "Name": "database",
+                "EndpointID": "b7dcf87f8a8501eab01c6e7fe58aa9454ae81c84c3bc41d9490bcd92e2ab531a",
+                "MacAddress": "02:42:ac:18:00:03",
+                "IPv4Address": "172.24.0.3/16",
+                "IPv6Address": ""
+            }
+```
+
+## Create a Docker network
+
+To create a network simply run: 
+
+`docker network create my_app_network`
+
+## Attach Containers to a network
+
+To directly attach a new container to the newly created network run:
+
+`docker run --name my_new_webapp --network="my_app_network" -d httpd:2.4-alpine`
+
+To attach an already running container to a network run:
+
+`docker network connect my_app_network my_running_webapp`
+
+They can now talk to each other. 
+
+## Networking with Docker Compose
+
+When running your containers with Docker Compose it by default creates a network of all service containers in the `docker-compose.yml` file.
+
+#### For More Information:
+- [Docker Networking: Overview](https://docs.docker.com/network/)
+- [Docker Networking: Tutorial for standalone containers](https://docs.docker.com/network/network-tutorial-standalone/)
+- [Docker Compose: Networking in Compose](https://docs.docker.com/compose/networking/)
+