I need to install docker on Angstrom linux, In order to do that I would like to download the source code of docker, and make the files myself.
But I cannot find the source code?
docker.github.io is apparently just the documentation.
Thanks!
You need to build Moby, to make it simple, see Moby as the new name for Docker.
To do so, simply clone the git repository, checkout the tag you want and run a make command
git clone https://github.com/moby/moby.git
git checkout tags/VERSION
make
You will need to have Docker installed on your dev machine to build it.
Docker Desktop includes Docker Engine, Docker CLI client, Docker Compose, Docker Content Trust, Kubernetes, and Credential Helper.
As mentioned in https://github.com/docker/docker-ce/blob/master/README.md
The source code for Docker Engine is on:
https://github.com/moby/moby
The source code for docker CLI is on:
https://github.com/docker/cli
The source code of docker compose is on:
https://github.com/docker/compose
But to Bring these tools to a usable bundle, you need Docker Desktop.
The source code of Docker Desktop is on:
https://download.docker.com/
CAUTION: As you can see, the source code of Docker Desktop that they are providing is not under any version control system, thus hard to audit. So please be careful when putting this code in production.
Related
I am just starting to learn about docker. Is docker repository (like Docker Hub) useful? I see the docker image as a package of source code and environment configurations (dockerfile) for deploying my application. Well if it's just a package, why can't I just share my source code with the dockerfile (via GitHub for example)? Then the user just downloads it all and uses docker build and docker run. And there is no need to push the docker image to the repository.
There are two good reasons to prefer pushing an image somewhere:
As a downstream user, you can just docker run an image from a repository, without additional steps of checking it out or building it.
If you're using a compiled language (C, Java, Go, Rust, Haskell, ...) then the image will just contain the compiled artifacts and not the source code.
Think of this like any other software: for most open-source things you can download its source from the Internet and compile it yourself, or you can apt-get install or brew install a built package using a package manager.
By the same analogy, many open-source things are distributed primarily as source code, and people who aren't the primary developer package and redistribute binaries. In this context, that's the same as adding a Dockerfile to the root of your application's GitHub repository, but not publishing an image yourself. If you don't want to set up a Docker Hub account or CI automation to push built images, but still want to have your source code and instructions to build the image be public, that's a reasonable decision.
That is how it works. You need to put the configuration files in your code, i.e,
Dockerfile and docker-compose.yml.
I'm trying to start two containers (each with different image) using Jenkins shell commands. I tried installing docker extension in Jenkins and/or setting docker in global configuration tools. I am also doing all this in a pipeline. After executing docker run... I'm getting Docker: not found error in Jenkins console output.
I am also having a hard time finding a guide on the internet that describes exactly what I wish to accomplish. If it is of any importance, I'm trying to start a Selenium Grid and a Selenium Chrome Node and then using maven (that is configured and works correctly) send a test suite on that node.
If u have any experience with something similiar to what I wish to accomplish, please share your thoughts as what the best approach is to this situation.
Cheers.
That's because docker images that you probably create within your pipeline cannot also run (become containers) within the pipeline environment, because that environment isn't designed to also host applications.
You need to find a hosting provider for your docker images (e.g. Azure or GCP). Once you set up the hosting part, you need to add a step to your pipeline to upload/push the image to that provider's docker registry or to the free public Docker Hub. Then, finally, add a step to your pipeline to send a command to your hosting, to download the image from whichever docker registry you chose, and to launch the image into a container (this last part of download and launch is covered by docker run). Only at that point you have a running app.
Good luck.
Somewhat relevant (maybe it'll help you understand how some of those things work):
Command docker build is comparable to the proces of producing an installer package such as MSI.
Docker image is comparable to an installation package (e.g. MSI).
Command docker run is comparable to running an installer package with the goal of installing an app. So, using same analogy, running an MSI installs an app.
Container is comparable to installed application. Just like an app, docker container can run or be in stopped state. This depends on the environment, which I referred to as "hosting" above.
Just like you can build an MSI package on one machine and run it on other machines, you build docker images on one machine (pipeline host, in your case), but you need to host them in environments that support that.
It seems like there are two ways to add documentation to a docker image:
You can add a readme.md in the root folder (where your docker file is located) and this is meant to be parsed by the dockerhub automated build system.
The second way is by using the manifest
https://docs.docker.com/docker-hub/publish/publish/#prepare-your-image-manifest-materials
But the documentation doesn't really explain well how to annotate the manifest file for an image. Also it looks like the manifest command is considered experimental.
What is the recommended way of documenting a docker image?
Personally i prefer not having to add documentation when the container is being built, i would much rather a file in the source control. However the md file method seems to have minimal support.
Most modern container registries (like Dockerhub, Quay, Harbor) have a webinterface that can render and display documentation in Markdown format. When you do automatic builds on Dockerhub from a Github repo, the git repo's README.md can get automatically synced to the repo on Docker Hub. If you build your images locally (or via a CI runner) and push them to Docker Hub you could also push the README file using the docker-pushrm tool. It also supports other container registries than Dockerhub.
I have set up an automated build from a Github repository for an application in Docker hub, but as part of the build process, I'd like to be able to write the current tag name to a local file.
Does Docker hub provide any environment variable with the name of the tag being built, which I can echo into a local VERSION file?
I'd like to avoid actually installing git inside the container to perform a describe, as well as including the entire (currently dockerignored) .git folder to retrieve this info.
Thank you!
I'm new to docker and I wonder why there is no command to fetch AUTOMATED BUILD-repo's Dockerfile to build image locally from it (can be convenient some times I guess, instead of opening browser, peeking for github reference on repo's page and then using git to clone)
I have created dockerfileview to fetch Dockerfile from Docker Hub.
https://github.com/remore/dockerfileview
The automated build normally has a githubrepo behind it and links to the original repository in the build details section under the Source Repository heading. Which automated build are you looking for the source file for?
If you would like to search for images from the command line you can run docker search TERM to find images (but not their docker files). You can also use docker history to give a rough approximation of the commands that went in the docker file.
e.g.