Chapter 10

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

1. The three core elements are sandbox, endpoint, and network.
2. Execute this command:

$ docker network create --driver bridge frontend

3.  Run this command:

$ docker container run -d --name n1 \
    --network frontend -p 8080:80 nginx:alpine
$ docker container run -d --name n2 \
    --network frontend -p 8081:80 nginx:alpine

Test that both NGINX instances are up and running:

$ curl -4 localhost:8080
$ curl -4 localhost:8081

You should be seeing the welcome page of NGINX in both cases.

4. To get the IPs of all attached containers, run this command:

$ docker network inspect frontend | grep IPv4Address

You should see something similar to the following:

"IPv4Address": "172.18.0.2/16",
"IPv4Address": "172.18.0.3/16",

To get the subnet used by the network, use the...