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Container Lifecycle

These exercises cover the basics container lifecycle commands related to creating, starting, stopping and deleting a container. They are essential to working day-to-day with containers.

Use the below command references to complete the exercises.

Lifecycle Reference Commands

Command Description
docker run <options> <image> <command> Spawns and runs an instance of the Docker image
docker run -i -t <options> <image> <command> Spawns an interactive instance of the Docker image
docker run -d <options> <image> <command> Spawns a daemonized instance of the Docker image
docker start <container name/container ID> Starts a stopped container
docker stop <container name/container ID> Stops a running container
docker rm <container name/container ID> Deletes a stopped container
docker container prune Deletes all stopped containers

Container Status Commands

Command Description
docker ps Displays status for all running containers.
docker ps -a Displays status of all containers.
docker ps -a -q Displays only the container IDs

Container Images

Command Description
docker images Displays locally cached container images.

Container Logs

Command Description
docker logs <container name/container ID> Displays locally cached container images.

Exercise 1

Create a simple container.

  • Create a container using the busybox image and instruct it to echo: Hello from busybox!.
  • View it's status using list command.

[Solution]

Exercise 2

Create an interactive container.

  • Create an interactive container using the busybox image using /bin/sh for the shell.
  • List the contents of the /etc directory
  • Exit the container.

[Solution]

Exercise 3

Create a daemonized container.

  • Create a daemonized container using the busybox image and the following command: /bin/sh -c "while true; do echo hello there; sleep 2; done"
  • After a few seconds, view the logs.
  • Then stop it and view it's status.

[Solution]

Exercise 4

Start and Stop a container.

  • Using the container from exercise 3 - Start it.
  • View it's status using the list command.
  • Then view it's logs.
  • Stop the container.

[Solution]

Exercise 5

Remove a container.

Delete all the containers created in these exercises.

[Solution]