08. Setting up a Network

Hands-on labs Introduction to Docker

Exercise 08: Setting up networks

When you run multiple containers, they sometimes need to listen to each other. For that we can create networks in Docker. There are multiple types of networks available

• Bridge - Network isolation. Containers get their own IP
• Host - Containers share the IP address of the host
• Overlay - Networks are shared over hosts
• None - No network facilities More information

Start a new container in the default network

• Make sure you run Linux containers (check the whale icon)
• Run the busybox container in interactive mode

docker run -ti busybox

• Check the ipaddress ifconfig

• Ping www.google.com ping www.google.com

• Exit the container but not stop it ! (CTRL-P, CTRL-Q)

• Inspect the container and check the IP Address

docker inspect <containerid>

• Start a new busybox container
• Can they access each other by using ping

Setting up your own networks

• Create 2 own networks

docker network create -d bridge vslivetest1
docker network create -d bridge vslivetest2

• Start 2 new busybox containers. Attach them to different networks

docker run -ti --network vslivetest1 busybox
docker run -ti --network vslivetest2 busybox

• Can they access each other?

Cleaning up

• Stop and remove all running containers

docker stop <containerid>
docker rm <containerid>

• Stop and remove all networks

docker network rm <networkname>