cri-tools
nerdctl
cri-tools | nerdctl | |
---|---|---|
7 | 33 | |
1,557 | 7,418 | |
0.6% | 1.4% | |
9.2 | 9.6 | |
2 days ago | 2 days 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-tools
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Migrating from dockershim to containerd
Installing crictl (https://github.com/kubernetes-sigs/cri-tools/blob/master/docs/crictl.md) was helpful, as well as journalctl -u containerd.
- kubectl get nodes -o wide shows containerd runtime, but sudo ctr containers list doesn't return any containers on host
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Debugging containerd, A "new" container runtime means new debugging techniques are required
crictl: Uses the CRI interface to fetch data about containers, agnostic of CRIs. Maintained by Kubernetes at https://github.com/kubernetes-sigs/cri-tools
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Quick question: Can you run crictl commands from within a running container?
FROM alpine:latest RUN wget -O - https://github.com/kubernetes-sigs/cri-tools/releases/download/v1.23.0/crictl-v1.23.0-linux-amd64.tar.gz | gunzip | tar xvf - && mv crictl /usr/bin
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k8s-the-hard-way
# wget https://github.com/kubernetes-sigs/cri-tools/releases/download/v1.21.0/crictl-v1.21.0-linux-amd64.tar.gz \ https://github.com/opencontainers/runc/releases/download/v1.0.0-rc93/runc.amd64 \ https://github.com/containernetworking/plugins/releases/download/v0.9.1/cni-plugins-linux-amd64-v0.9.1.tgz \ https://github.com/containerd/containerd/releases/download/v1.4.4/containerd-1.4.4-linux-amd64.tar.gz \ https://storage.googleapis.com/kubernetes-release/release/v1.21.0/bin/linux/amd64/kubectl \ https://storage.googleapis.com/kubernetes-release/release/v1.21.0/bin/linux/amd64/kube-proxy \ https://storage.googleapis.com/kubernetes-release/release/v1.21.0/bin/linux/amd64/kubelet
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A Window into Docker, minikube, and containerd
We are in the endgame now. I promise. From the README, crictl provides a CLI for CRI-compatible container runtimes. The following snippet performs the following:
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๐ Manage WebAssembly Apps in WasmEdge Using Docker Tools
Also make sure that you have cri-o, crictl, containernetworking-plugins, and buildah or docker installed.
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 โ 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 ยท containerd/nerdctl
What are some alternatives?
node-feature-discovery - Node feature discovery for Kubernetes
lima - Linux virtual machines, with a focus on running containers
cni - Container Network Interface - networking for Linux containers
podman-compose - a script to run docker-compose.yml using podman
SSVM - WasmEdge is a lightweight, high-performance, and extensible WebAssembly runtime for cloud native, edge, and decentralized applications. It powers serverless apps, embedded functions, microservices, smart contracts, and IoT devices.
kaniko - Build Container Images In Kubernetes
cfssl - CFSSL: Cloudflare's PKI and TLS toolkit
podman - Podman: A tool for managing OCI containers and pods.
runc - CLI tool for spawning and running containers according to the OCI specification
Moby - The Moby Project - a collaborative project for the container ecosystem to assemble container-based systems
rustwasmc - Tool for building Rust functions for Node.js. Combine the performance of Rust, safety and portability of WebAssembly, and ease of use of JavaScript.
k3s - Lightweight Kubernetes