06. Docker Network

Docker Network Mode

• bridge: setup ip for every container, and connect container to docker0 network bridge. (Default mode)
• host: The container will not virtualize it's own net, it share the ip and port with host.
• none: The container own its own network namespace, but there is no netowrk settings, such as veth pair, bridge connection, ip, etc.

Net Mode	Brief
bridge	Allocate IP and other resources for each container, and connect to docker virtual net bridge, default mode
host	Container will not own it's onw net configuration, share with host
none	Container has the independent Network namespace, but there is no network resources
container	The new container will not create its own network configuration, only share with a specified container

Info

Docker will create a bridge named docker0, it connects to other physical or virtual net card, it can put all containers and local host to same physical network. Docker specify IP and mask for docker0 by default, which can make sure the communication between host and container.

Bridge

Docker Bridge

Example to test

docker run -d -p 8081:8080 --name test1 centos
docker run -d -p 8082:8080 --name test2 centos

Host

docker run -d -p 8083:8080 --network host --name test3 centos

Docker Host

Info

option -p 8083:8080 will not work

None

There is no network

docker run -d -p 8084:8080 --network none --name test4 centos

Container

Docker Container

docker run -d -p 8085:8080 --network container:test3 --name test5 centos

Warning

if shutdown the shared container, the new container will lost all network connection.

Network Operation

Default mode is bridge

• List
  docker network ls
• Create
  docker network create {newwork_name}
• Delete
  docker network delete {network_name}
• Inspect
  docker network inspect {network_name}

Customized Network

Reference

1. Tutoriaspoint
2. Docker Dockerfile on runoob
3. Dockerfile reference (official)