cri-o
registry.k8s.io
cri-o | registry.k8s.io | |
---|---|---|
33 | 20 | |
5,028 | 347 | |
0.6% | 1.4% | |
9.8 | 7.2 | |
about 7 hours ago | 3 months ago | |
Go | Go | |
Apache License 2.0 | Apache License 2.0 |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
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.
cri-o
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The Road To Kubernetes: How Older Technologies Add Up
Kubernetes on the backend used to utilize docker for much of its container runtime solutions. One of the modular features of Kubernetes is the ability to utilize a Container Runtime Interface or CRI. The problem was that Docker didn't really meet the spec properly and they had to maintain a shim to translate properly. Instead users could utilize the popular containerd or cri-o runtimes. These follow the Open Container Initiative or OCI's guidelines on container formats.
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Complexity by Simplicity - A Deep Dive Into Kubernetes Components
Multiple container runtimes are supported, like conatinerd, cri-o, or other CRI compliant runtimes.
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Kubernetes Cluster Setup Using Kubeadm on AWS
Install container runtime on all nodes. We will use cri-o.
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Creating Kubernetes Cluster With CRI-O
Container Runtime Interface (CRI) is one of the important parts of the Kubernetes cluster. It is a plugin interface allowing kubelet to use different container runtimes. And recently CRI-O container runtime has been announced as a CNCF Graduated project. I thought of writing a blog on CRI-O and how to set up a single-node Kubernetes cluster with Kubeadm and CRI-O.
- 32“ E Ink screen that displays daily newspapers on your wall
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Understanding Docker Architecture: A Beginner's Guide to How Docker Works
CRI-O: This is an open-source container runtime designed for use with Kubernetes. It is a lightweight and stable environment for containers. It also complies with the Kubernetes Container Runtime Interface (CRI), making it easy to integrate with Kubernetes.
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How are they doing it?
With CRI-O I believe you can configure registry mirror locations…. Similar to this: https://github.com/cri-o/cri-o/issues/4941
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Docker is deleting Open Source organisations - what you need to know
Alternatives like Podman and CRI-O continue to gain traction and may replace Docker in various places. For example, Kubernetes used to use Docker, then moved to containerd, and now also support CRI-O. Generally speaking, the core features of "Docker" are such a commodity now that no one was the wiser when Kubernetes stopped using it.
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kubeadm init error: CRI v1 runtime API is not implemented
will the site be available for the CKA exam? https://github.com/cri-o/cri-o/blob/main/install.md
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Container Deep Dive 2: Container Engines
The CRI-O container engine provides a stable, more secure, and performant platform for running Open Container Initiative (OCI) compatible runtimes. CRI-Os purpose is to be the container engine that implements the Kubernetes Container Runtime Interface (CRI) for OpenShift Container Platform and Kubernetes, replacing the Docker service. Source
registry.k8s.io
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Pull through cache, like AWS just announced
If you stop to think about, what AWS is selling here, it's quite funny. Most of the infrastructure behind registry.k8s.io is hosted on AWS (and also GCP). So AWS essentially tells you: Don't trust the upstream registry, it might go down, cache it on your own registry, hosted also by us.
- Resilient image cache/mirror
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Announcing pull through cache for registry.k8s.io in Amazon Elastic Container Registry
For example: if you only allow cluster autoscaler and metrics server from registry.k8s.io you can pull those images through the cache as someone who has create repo IAM privileges. If someone without create repo privileges tries to pull a new image it will fail because they can't create the initial repo.
- How are they doing it?
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registry.k8s.io down from Paris, France?
https://registry.k8s.io (the root url at /) redirects you to https://github.com/kubernetes/registry.k8s.io where we have an issue tracker.
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FailedCreatePodSandBox
❗ This container is having trouble accessing https://registry.k8s.io
- registry.k8s.io/README.md at main · kubernetes/registry.k8s.io · GitHub
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How to own your own Docker Registry address
Hosting a forwarding / redirect server instead of actually hosting images is probably a decent idea.
The K8s proxy is redirecting from only hosting on GCR to community-owned registries - https://kubernetes.io/blog/2023/03/10/image-registry-redirec...
You can view the code here - https://github.com/kubernetes/registry.k8s.io
But because everyone is already pointing at gcr.io (just like many openfaas users point at docker.io/) - they're having to do a huge campaign to announce the new URL - the same would apply with the author's solution here.
I wrote some automation for hosting (not redirects) in arkade with the OSS registry - Get a TLS-enabled Docker registry in 5 minutes - https://blog.alexellis.io/get-a-tls-enabled-docker-registry-...
The registry is also something you can run on a VM if you so wish, and have act as a pull through cache.
Apart from reliability - GitHub's container registry is the current next best option - but we have to ask ourselves, what happens when they start charging or the outages start to last longer or are more frequent than 1-2 times per week as we've seen in Q1 2023.
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Docker's deleting Open Source images and here's what you need to know
One annoyance with how docker images are specified is they include the location where they are stored. So if you want to change where you store you image you break everyone.
I wonder if what regsitry.k8s.io does could be generalized:
https://github.com/kubernetes/registry.k8s.io/blob/main/cmd/...
The idea is the depending on which cloud you are pulling the image from, they will use the closest blob store to service the request. This also has the effect that you could change the source of truth for the registry without breaking all Dockerfiles.
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k8s.gcr.io Image Registry Will Be Frozen From the 3rd of April 2023
If you are using updated helm charts then most of them have already replaced with registry.k8s.io, for example nginx ingress so not really breaking change.
What are some alternatives?
containerd - An open and reliable container runtime
official-images - Primary source of truth for the Docker "Official Images" program
crun - A fast and lightweight fully featured OCI runtime and C library for running containers
one-click-apps - Community Maintained One Click Apps (https://github.com/caprover/caprover)
k3s - Lightweight Kubernetes
docker-registry-mirror - Helm chart for a Docker registry. Successor to stable/docker-registry chart.
minikube - Run Kubernetes locally
ipdr - 🐋 IPFS-backed Docker Registry
cri-dockerd - dockerd as a compliant Container Runtime Interface for Kubernetes
devenv - Fast, Declarative, Reproducible, and Composable Developer Environments
kaniko - Build Container Images In Kubernetes
nerdctl - contaiNERD CTL - Docker-compatible CLI for containerd, with support for Compose, Rootless, eStargz, OCIcrypt, IPFS, ...