Docker networking

Show all networks

docker network ls

filter all bridge networks

docker network ls -f driver=bridge

To find all network IDs and Drivers

docker network ls --format "{{.ID}}: {{.Driver}}"

Inspect a network(get all info about a network in json format)

docker network inspect <network_id>

Create a new network

docker network create <network_name>

Above command creates a bridge network by default if we don’t specify what kind of driver we want.

Manually creating a bridge network

docker network create -d bridge <network_name>

Connecting container to a network

docker network connect <network_name> <container_name> (We can use name or ID)

After connection, container can communicate with other containers in the same network.

Creating a container and attaching it to the network

docker container run -d --name <container_name> --network <network_name> <image>

One container can be connected to many network simultaneously (Basically Many to Many relationship)

Disconnecting a network for a container

docker network disconnect <network_name>(network we want to disconnect) <container_name>

Executing commands in a container

For example pinging one container from another container in the same network

docker container exec -it <container1_name> (command to execute) ping <container2_name>

EXAMPLE

docker container exec -it mynginx1 ping mynginx2

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