dumb-init
acolor
| dumb-init | acolor | |
|---|---|---|
| 10 | 2 | |
| 6,700 | 4 | |
| 0.5% | - | |
| 0.0 | 2.6 | |
| 26 days ago | almost 2 years ago | |
| Python | Awk | |
| MIT License | ISC License |
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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
acolor
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Is there a program that formats the output of another programming using custom formatting rules?
A fairly simple program which only colorizes is grc. I wrote acolor in a similar vein, but it uses arbitrary programs/scripts instead of pure regex, and I've only written support for the programs I use, so no tcpdump. Don't use it unless you want to write your own colorizing scripts (if you do, please contribute!)
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Distro balls
For example, I wrote a little utility called acolor. Running sudo make install defaults to /usr/local/*.
What are some alternatives?
tini - A tiny but valid `init` for containers
bedrocklinux-userland - This tracks development for the things such as scripts and (defaults for) config files for Bedrock Linux
docker-centos7-systemd-unpriv - Dockerfile for CentOS7 with Systemd in unprivileged mode
grc - generic colouriser
eks-anywhere - Run Amazon EKS on your own infrastructure 🚀
systemd - The systemd System and Service Manager
compiling-containers
ko - Build and deploy Go applications
vault-exfiltrate - proof-of-concept for recovering the master key from a Hashicorp Vault process
flare - Debug how containers react to signals
ouroboros - Automatically update running docker containers with newest available image
Lean and Mean Docker containers - Slim(toolkit): Don't change anything in your container image and minify it by up to 30x (and for compiled languages even more) making it secure too! (free and open source)