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Break the Network

Let's quarantine a container and make sure that we can't reach the outside world.

The ping command allows you to check for connectivity to a host. For example we can ping google.com:

ping google.com

If everything is working, we'll see a response like:

64 bytes from 142.250.189.14: icmp_seq=0 ttl=119 time=13.636 ms
64 bytes from 142.250.189.14: icmp_seq=1 ttl=119 time=17.735 ms
64 bytes from 142.250.189.14: icmp_seq=2 ttl=119 time=17.691 ms

You can kill the ping command with Ctrl+C.

Assignment

Use docker ps, docker stop, and docker rm to stop and remove the "getting started" container if it's running.
Start a new "Getting Started" container in --network none mode:

docker run -d --network none docker/getting-started

Run the ping command with a timeout of 2 seconds inside the container:

docker exec CONTAINER_ID ping google.com -W 2

If all goes well, the program should hang for 2 seconds, then report an error message, because you don't have internet access!