Challenge, Medium,  on  Containers

Edit a File in a Running Container: a Slim Base Image Case

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Similar to the previous challenge, you need to edit the index.html file of the running web server container:

  • Replace the phrase "Hello World" with the phrase "Hello Labs".
  • Add the phrase "Practice for the win!" to any place in the file.

However, this time, the container is based on a slim image, so there is no shell or any file editing tools inside. Of course, you cannot replace the base image - the container must not be restarted.

You can find the file in the /var/www/html directory. Good luck!

Hint 1

Executing commands in the container is rather challenging in this case. Can you think of another way to modify the file?

Hint 2

Leverage the fact that the container is running on the same machine as you. There must be a way to access its file system.

Hint 3

You can use docker cp to copy files from and to the container.

How to Author Challenges on iximiuz Labs

Instead of providing a subpar online editing experience, iximiuz Labs offers a helper CLI tool called labctl, allowing you to use your favorite text editor (or a full-featured IDE) to write content from the comfort of your local machine.

Install labctl CLI

curl -sf https://labs.iximiuz.com/cli/install.sh | sh

This will download and install the latest version of the labctl CLI. You only need to do this once per workstation.

Authorize labctl

labctl auth login

This will open a browser window asking you to authorize labctl to access your account. You need to do it after a fresh install of labctl and repeat it whenever the auth session expires.

Pull challenge content

labctl content pull challenge edit-file-in-running-slim-container

This will create a local copy of the challenge content in a directory named edit-file-in-running-slim-container. You only need to do this once per challenge.

Stream your changes

labctl content push -fw challenge edit-file-in-running-slim-container

Run this command in a separate terminal to continuously upload your changes to the server while editing the challenge in your favorite text editor or IDE.

You can also use labctl to create, list, and delete your content. Learn more about the available commands: labctl content --help

Start challenge