You run containers, not dockers - Discussing Docker variants, components and versioning

• Moby

  226 68,835 10.0 Go

  The Moby Project - a collaborative project for the container ecosystem to assemble container-based systems

  

  The first commit of Docker happened on January 19, 2013. You can still find it on GitHub: https://github.com/moby/moby/commit/a27b4b8cb8e838d03a99b6d2b30f76bdaf2f9e5d

• SaaSHub

  www.saashub.com featured

  SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

  

• podman

  377 24,008 10.0 Go

  Podman: A tool for managing OCI containers and pods.

  

  I admit the title of this section sounds worse than it is, but the fact is that sometimes when you install Podman, you can also have an alias called "docker" pointing to "podman". That can make you believe that you are running Docker and come to the Docker forum asking about an issue which is actually not related to Docker. The alias exists because Podman tries to keep a similar command line interface to the interface of Docker, so when someone relies on an existing docker command, they don't have to rewrite their scripts if they are lucky.

• docker

  1 68,665 - Go

  Discontinued The Moby Project - a collaborative project for the container ecosystem to assemble container-based systems [Moved to: https://github.com/moby/moby] (by dotcloud)

  

  I shared the first commit of Docker's source code at the beginning of the "Docker as a software" section. The source code is on GitHub in the moby/moby repository. During the years since Docker was created, many repositories were used. "moby/moby" was originally called "dotcloud/docker" and the URL still works (http://github.com/dotcloud/docker). When the company was renamed, the repository was renamed again to "docker/docker" (https://github.com/dotcloud/docker), but both are redirected to Moby today. Moby is the base source code of the Docker variants we have today.

• nerdctl

  10 1 0.0 Go

  contaiNERD CTL - Docker-compatible CLI for containerd, with support for Compose, Rootless, eStargz, OCIcrypt, IPFS, ... (by AkihiroSuda)

  As the "docker" command is the client for "dockerd", nerdctl is the client for containerd, although the project was started only at the end of 2020.

• buildx

  30 3,593 9.7 Go

  Docker CLI plugin for extended build capabilities with BuildKit

  

  The client can also be SDK, although the SDKs are for the core Docker and not for the plugins like Buildx.

• awesome-compose

  58 35,734 2.1 HTML

  Awesome Docker Compose samples

  

  There is another plugin called Docker Compose. There was a Compose v1 originally written in Python for which we used the docker-compose command, but now we need to use docker compose without the dash.

• Docker Swarm

  183 4,188 10.0 Markdown

  Source repo for Docker's Documentation (by docker)

  

  I don't recommend using docker.io today as it will install an older version (at the time of writing this post, it is 24.0.7 on Ubuntu 22.04) and most of the tutorials will show you features based the official version and the official documentation.

• runc

  35 11,948 9.4 Go

  CLI tool for spawning and running containers according to the OCI specification

  

  Now we have dockerd which uses containerd, but containerd will not create containers directly. It needs a runtime and the default runtime is runc, but that can be changed. containerd actually doesn't have to know the parameters of the runtime. There is a shim process between containerd and runc, so containerd knows the parameters of the shim, and the shim knows the parameters of runc or other runtimes.

• containerd

  140 17,574 9.9 Go

  An open and reliable container runtime

  

  So once we had a single binary, then "Docker, Inc" started separating the functionalities into multiple binaries on Linux. That was the beginning the of dependencies and components we have today, except that these dependencies are now not limited to Docker. containerd can also be the container runtime of Kubernetes.

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