unikernels
nerdctl
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unikernels | nerdctl | |
---|---|---|
2 | 33 | |
536 | 7,356 | |
0.0% | 2.1% | |
0.0 | 9.6 | |
about 2 years ago | 2 days ago | |
C++ | Go | |
- | 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.
unikernels
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Nanos – A Unikernel
About unikernels https://github.com/cetic/unikernels?tab=readme-ov-file#unike...
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Docker is dead?!? Podman - an alternative tool?
Another possibility to switch from Docker containers are the so-called Unikernels. These are briefly mentioned here for the sake of completeness, even though they currently have no significance in the Kubernetes context. An interesting blog post on the topic can be found on Hackernoon. It is an interesting construct that may one day find its way into the world of Kubernetes if containers can be replaced by unikernels. Currently, the use of unikernels would not be feasible in my opinion.
nerdctl
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Colima k8s nix setup
What about the docker-cli? colima also ships with a docker-compatible cli to interact with containerd called nerdctl. We can execute the same docker cli commands like:
- Nerdctl v2 Beta
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Nginx Unit – Universal web app server
Using nerdctl: https://github.com/containerd/nerdctl
I'd really disagree that compose files are somehow one-shot, or blindly modified. To the contrary, really, we have them checked in with the source code. Upon deployment to the cluster, the (running) services will be intelligently updated or replaced (in a rolling manner, causing zero downtime). LXC might be more elegant, but I have no idea what simple, file-based format I could use to let engineers describe the environment their app should run in without compose.
I need something that even junior devs can start up with a single command, that can be placed in the VCS along with the code, and that will not require deep Linux knowledge to get running. Open for suggestions here, really.
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Jenkins Agents On Kubernetes
Now since Kubernetes works off of containerd I'll be taking a different approach on handling container builds by using nerdctl and the buildkit that comes bundled with it. I'll do this on the amd64 control plane node since it's beefier than my Raspberry Pi workers for handling builds and build related services. Go ahead and download and unpack the latest nerdctl release as of writing (make sure to check the release page in case there's a new one):
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Going through a Kubernetes training with autogenerated captions and about half are coming up like this.
That's why nerdctl, their cli binary, is so well named.
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Python + containerd? Who might be interested?
Well, it is indeed a good option. However, containerd is a good alternative that is growing even among developers. Please see: https://github.com/containerd/nerdctl
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How to own your own Docker Registry address
Nerdctl/containerd has IPFS support :)
https://github.com/containerd/nerdctl/blob/main/docs/ipfs.md
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DockerHub replacement stratagy and options
nerdctl supports IPFS for both image pulling and pushing, including encrypted images and eStargz lazy pulling. For building, the current method is a locally hosted translator so that the traditional pulls can be converted to work over IPFS. They even have docs on running it on k8s node, though if my reading is correct this isn't exactly a cloud native approach (running systemd services on each node...).
- Docker's deleting Open Source images and here's what you need to know
- Release v1.0.0 · containerd/nerdctl
What are some alternatives?
podman - Podman: A tool for managing OCI containers and pods.
lima - Linux virtual machines, with a focus on running containers
nanos - A kernel designed to run one and only one application in a virtualized environment
podman-compose - a script to run docker-compose.yml using podman
k3d - Little helper to run CNCF's k3s in Docker
kaniko - Build Container Images In Kubernetes
Moby - The Moby Project - a collaborative project for the container ecosystem to assemble container-based systems
k3s - Lightweight Kubernetes
kind - Kubernetes IN Docker - local clusters for testing Kubernetes
colima - Container runtimes on macOS (and Linux) with minimal setup
buildkit - concurrent, cache-efficient, and Dockerfile-agnostic builder toolkit