dumb-init
Lean and Mean Docker containers
dumb-init | Lean and Mean Docker containers | |
---|---|---|
10 | 38 | |
6,700 | 18,194 | |
0.5% | 0.7% | |
0.0 | 9.0 | |
26 days ago | 10 days ago | |
Python | Go | |
MIT License | Apache License 2.0 |
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For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
dumb-init
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Fargate: catching docker stopping
I think you are on the right track in thinking it’s a signal handling issue. You mentioned using some “bash scripts”, have you tried something like dumb-init?
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"systemd doesn't follow Unix philosophy "
At the other extreme, there's dumb-init - it implements the special pid-1 behaviors and acts as a wrapper around the one script you want to run. It's ideal for containers or virtual machines that don't need user logins or more than one service.
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What should readiness & liveness probe actually check for?
Oh, and another thing. Many containers launch their main process from a shell script. When this happens, the shell script receives the SIGTERM event, not the application. Your shell script MUST relay SIGTERM events back to the main process, and it doesn’t happen by default. You can use a shell script wrapper, like dumb-init (https://github.com/yelp/dumb-init), as your entry point if you need to use a shell script on container startup.
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Distro balls
It's a plus because Gentoo fully supports the choice of Systemd or OpenRC. It also has minit, dumb-init, sysvinit, cinit in tree for the more adventurous. No one was calling the AUR bloat, the parent comment just mentions that Gentoo has an equivalent project, GURU.
- How to make containers handle the SIGTERM signal which makes K8s terminate application gracefully?
- Show HN: EnvKey 2.0 – End-To-End Encrypted Environments (now open source)
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`COPY –chmod` reduced the size of my container image by 35%
, but I prefer to not have to make this assumption and use an init system instead.
[1]: https://github.com/Yelp/dumb-init
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Systemd by Example
> It has no init system.
Apologies that I can't link directly to the "--init" flag but docker actually does have an init, it's just (err, was?) compiled into the binary: https://docs.docker.com/engine/reference/commandline/run/#op...
My recollection is that it either adopted, or inspired, https://github.com/Yelp/dumb-init#readme which folks used to put into their Dockerfile as the init system back in the day
Folks (ahem, I'm looking at you, eks-anywhere[0]) who bundle systemd into a docker container are gravely misguided, and the ones which do so for the ability to launch sshd alongside the actual container's main process are truly, truly lost
0: https://github.com/aws/eks-anywhere/issues/838#issuecomment-...
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Question: How to handle events to safely terminate a Node.js inside Docker container
You can use something like dumb-init which is designed to correctly handle signals
- Docker e Nodejs - Dockerizando sua aplicação com boas praticas
Lean and Mean Docker containers
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Is updating software in Docker containers useful?
And if you want to make the container quickly secure without bloats, maybe give this a try https://github.com/slimtoolkit/slim
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An Overview of Kubernetes Security Projects at KubeCon Europe 2023
Slim.ai presents the data in a more user friendly way than many of the other tools in this post. On top of its open source SlimToolkit for identifying the contents of an image, Slim.ai uses Trivy for vulnerability scanning.
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Tips for reducing Docker image size
What about https://github.com/slimtoolkit/slim?
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package a poetry project in a docker container for production
A last practice that I do not use at all and which may interest you is to use slim toolkit to keep only the useful elements in your final image.
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Standard container sizes
Anyone tried using https://github.com/docker-slim/docker-slim To minify an image?..
- DockerSlim - Optimize Your Containerized App Dev Experience. Better, Smaller, Faster, and More Secure Containers Doing Less! Minify Docker Images by up to 30x.
- A practical approach to structuring Golang applications
- How to optimize docker image size?
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M1: Docker doesn't find shared x64 shared objects even though platform was specified
Distroless images are better left for people with serious need for lightweight images and good Linux knowledge because they require lot of planning with the build so that they stay light and work. If you need lighter images but docker isn't your main tool and you can't afford to take hours and hours of practicing different build strategies you can check docker-slim (https://dockersl.im/). With this tool you can easily size down the images.
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I deleted 78% of my Redis container and it still works
Maybe this would help in that regard: https://github.com/docker-slim/docker-slim
What are some alternatives?
tini - A tiny but valid `init` for containers
minideb - A small image based on Debian designed for use in containers
docker-centos7-systemd-unpriv - Dockerfile for CentOS7 with Systemd in unprivileged mode
Go random string generator - Flexible and customizable random string generator
eks-anywhere - Run Amazon EKS on your own infrastructure 🚀
pipx - Install and Run Python Applications in Isolated Environments
systemd - The systemd System and Service Manager
dive - A tool for exploring each layer in a docker image
compiling-containers
gophish - Open-Source Phishing Toolkit
ko - Build and deploy Go applications
simple-scrypt - A convenience library for generating, comparing and inspecting password hashes using the scrypt KDF in Go 🔑