docker_networking

# To check docker0 interface in your system
$ ifconfig docker0

# Check the gateway IP
$ docker network inspect bridge |grep IPv4Address

# Check the subnet range
$ docker network inspect bridge |grep Subnet

# Spin the new container
$ docker container run -dt centos bash

# Verify container IP
docker container inspect <container id> |grep -i IPaddress

OR

# Run a command in a running container
$ docker container exec -it 887a184c48 bash

# Verify the IP
# ip addr list

NOTE: It should be from the same subnet range as #8

# How to change the default subnet range
/etc/docker/daemon.json 

{
  "bip": "172.20.0.1/16"
}

# Restart Docker daemon
sudo systemctl restart docker

# List networks
$ docker network ls

# To check the supported driver
$ docker info |grep -i Network

# Create user defined bridge
$ docker network create my-test-bridge-network

# List networks
$ docker network ls

# Check the subnet range
$ docker network inspect my-test-bridge-network |grep Subnet

# Create a container with a user-defined network 
$ docker container run -dt --name mybridgenet --network my-test-bridge-network centos bash

# Connect any existing container on the fly to this network
$ docker network connect my-test-bridge-network 887a184c48e4

# Removing a container from the network\
docker network disconnect <NETWORK> <CONTAINER>

# To create a network with own customize subnet range
$ docker network create --subnet 172.30.0.0/24 --gateway 172.30.0.1 my-test-subnet

# To assign specific IP to container
$ docker container run -dt --name mytest02 --ip 172.30.0.3  --network my-test-subnet centos bash

# Remove a network
$ docker network rm my-test

# Remove all unused network
docker network prune

# Create container using default Host Network
$ docker container run -dt --name myhost --network host centos bash

# Verify all the ip
$ ip addr list

# Create container using none network
$ docker container run -dt --name mynone --network none centos bash

# Verify all the ip
$ ip addr list