Container Images: Interactive Deep Dive

And the specification, maybe there’s some stuff to change, but we can store anything you want there. This is where we will store all the versions. And so, yeah, this is quite common. This is sometimes a very good practice. So we’ll say, okay, this is this target but with this exact digest. So if someone changed the digest, the target, pushed a new version, my build will remain the same, especially with latest.

There’s one new command, for instance, in Docker compose, when you can publish your Docker compose. So what you will do is it will be an OCI image containing your Docker compose YAML file. So there’s some stuff that is the same. And yet, the attestations are different because we build at a different time.

Pull the image

A Docker image consists of one or more layers, each of which represents a set of changes or instructions that are applied to the base layer. Each layer is identified why do we need docker by a unique ID or a digest, which is a hash of the layer’s content. Each layer also has a parent layer, except for the base layer, which has no parent.

Or you can say each line in the Dockerfile, (like a separate RUN instruction) adds a new layer to your image. A client provides a command-line interface (CLI) that allows you to interact with docker. When you run a command, the client sends the command to the daemon. A docker client can communicate with more than one daemon. Comprehensive, understandable, and applicable. Examples are sufficient to demonstrate real-world use and facilitate applying what is learned outside of the course.

OCI Runtime Tools

You have my full permission to use these starter projects for any client work you do. So feel free to take one of the starter projects and use it as a base for a $10,000 solution that you sell to a client. Also, this is the 5th course I’ve recorded. At this point I’ve put in close to 1,000 hours of recording and editing.

Dockerfile is a text document that contains instructions to build a Docker image. It automates the process and ensures that it is repeatable and consistent. Each instruction in a Dockerfile creates a new layer in the image. This layered architecture allows Docker to be incredibly efficient with disk space and image loading. Crun is a fast, lightweight and fully featured OCI runtime and C library for running containers. It is yet another implementation of OCI Runtime Spec fully written in C, led by Red Hat.

Resources

This way, multiple containers can share the same image layers without duplicating them. Any changes that you make to the container are stored in the diff directory, while the image layers remain unchanged. When you stop or delete the container, overlay2 unmounts the diff directory and deletes it along with any changes. A Docker image is a file that contains all the information and instructions to create and run a container.

So we just store them differently. We’ll see a bit later how it’s stored inside the registry. If you do a save, that’s what you have in your archive. We’ll just create some kind of basic image.

.dockerignore

In this post we can utilize the punkdata/nodejs-circleci git repo. Clone it locally and $ cd into the project directory. As organisations scale their containerised applications, manual management becomes impractical. Container orchestration automates these processes, providing a framework for deploying, managing, and scaling containers with efficiency.

The other one is the SLSA provenance. So all the context at build time. I can show very briefly what we have inside, but that’s not really the purpose of this tool. So it’s all but just, it means we can store everything we want in there. All right, so this stuff is just a file.

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And as long as you just follow the different links, it just works. We don’t need to create another tool to do that, we just use the exact same registry. If you look at the manifest, this is my image manifest. There’s the new artifact type, just say, okay, this is Docker compose project, okay, that’s fine. There’s a config, a config blob, as expected.

• Docker and other container engines uses RootlessKit to protect the real root on the host from potential container-breakout attacks.
• But what it will not be about is the specification.
• Scratch images basically an explicitly empty image.
• It maked easy for you as a developer to store, share, and manage container images.

Through the HEALTHCHECK instruction in Dockerfile or using the –health-cmd flag with the docker run command, Docker can automatically check the health of your containers. This can be used to ensure your application is working as expected without external dependencies for monitoring. Docker images can be stored in registries. Docker Hub is a public registry that anyone can use, and Docker is configured to look for images on Docker Hub by default.

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This is just how I can get to this information. This is the real one I want to get to run an image. And this is what you saw when you “docker pull” an image. In that case, docker pull with the platform AMD64.