Chapter 13

Here are some sample answers to the questions presented in this chapter:

1. The correct answer is as follows:

$ docker swarm init [--advertise-addr <IP address>]

The --advertise-addr is optional and is only needed if you the host have more than one IP address.

2. On the worker node that you want to remove, execute the following command:

 $ docker swarm leave

On one of the master nodes, execute the command $ docker node rm -f<node ID>, where <node ID> is the ID of the worker node to remove.

3. The correct answer is as follows:

$ docker network create \
    --driver overlay \
    --attachable \
    front-tier

4. The correct answer is as follows:

$ docker service create --name web \
    --network front-tier \
    --replicas 5 \
    -p 3000:80 \
    nginx:alpine

5. The correct answer is as follows:

$ docker service update --replicas 3 web