Network Management

Network Management

bridge (default)




Demo: Network Management

How to publish a container port in the bridge network:

docker run -d -p 80:80 nginx

How to disable network isolation for a container:

docker run -d --rm --network host nginx

Network Context



Common Issue

Demo: Network Context

Containers in the same docker-compose.yml are deployed to the same network:

docker-compose up -d
docker network ls
docker exec -it svc1 ping svc2

Demo: Breaking the Network Context

Containers launched over the mapped daemon socket do not end up in the same network context:

docker-compose \
    --file docker-compose.yml \
    --file docker-compose.context.yml \
    up -d
docker-compose exec dind sh

Inside of the dind service, start a new container:

docker run -it alpine

It will not be able to see any service from the docker-compose files:

ping svc1
ping svc2

Demo: Fixing the Broken Network Context

Continue to test inside the dind service:

docker run -it --rm --network test_default alpine

Once the container is started in the network used by the deployment, it can see other services:

ping svc1
ping svc2