There is therefore no way for your key to be exposed in one of your Docker layers. During the SSH connection, Docker simply uses your local SSH agent which keeps your key in memory. What is great is that no keys are copied to your Docker image. One of those new features is the -ssh flag, which allows you to forward your SSH agent to the Docker container. This is a relatively new way of building Docker images with advantages such as better performance and more features. The first method uses the Docker Buildkit. With all of this setup, let's see two different methods for how we can install this private git repository with npm install in a Dockerfile. Now, run npm install, and the repository should successfully download. "my-ssh-test-dependency": be sure to change the git repository to your own. "description": "Testing installing a private repository", At the minimum you must have a package.json with the following contents: You need a NodeJS project with a package.json that has the private git repository as a dependency. An NPM project that has a dependency on the private repository Git clone course, change the repository owner and name to your own private Git repository. You should now be able to clone your private repository through SSH with the following command: The easiest way to do this is by adding the following configuration to the ~/.ssh/config file: Host īe sure to replace the name of the key with the name that you have chosen. Also, be sure to add the key to your ssh agent. Npm install from github version how to#And, let's be sure that this actually works on your laptop: otherwise you may be debugging something in Docker that doesn't even work directly on your laptop!Ĭheck out the GitHub documentation on how to add an SSH key to your account. Npm install from github version download#You will also need an SSH key that you can use to download the private repository from GitHub. Otherwise, the npm install that we run later won't recognize this is a valid NPM repository. Npm install from github version free#Keep in mind that you can create a free private repository on GitHub since the beginning of this year.Īlso, be sure this repository at least contains a package.json file with at least an empty object as its contents. Therefore, make sure you spin one up if you don't already have one. Testing how to install a private git repository is of course pretty hard without a private git repository. Let's first get some prerequisites set up before we dive into the two methods. Any other git provider will however also work with this approach. In this post I'll use a private repository on GitHub as an example. We'll dive into two different methods to tackle this in a way that we do not expose our secrets in our Docker layers. How then do you properly use secrets in your Dockerfile? In this blog post, we'll look into a common use case: downloading private git repositories through an npm install. If you want to learn more about these layers, be sure to check out this great post that explains much more. As the cache is uploaded to the system of your provider, it may very well happen that your secret ends up plain-text on their servers. This is especially problematic when you build your Docker images in a (SaaS) CI/CD tool that supports caching. You may think that you properly clean up your secrets later in the Dockerfile, but the secret will then still be available in one of these layers. These are the layers that Docker creates with pretty much every command in your Dockerfile. What you will want to prevent is that your ssh key ends up in one of your intermediate images or layers. How do you properly use an SSH key in a Dockerfile? There are many ways to do it, including many ways to do it wrong. An NPM project that has a dependency on the private repository.
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