cri-dockerd
runtime-spec
cri-dockerd | runtime-spec | |
---|---|---|
11 | 11 | |
956 | 3,094 | |
2.5% | 0.9% | |
8.4 | 6.4 | |
5 days ago | 29 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-dockerd
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How to create a 3-node kubernetes cluster and deploy an application on my ubuntu 22.04 minibox
$ wget https://github.com/Mirantis/cri-dockerd/releases/download/v0.3.9/cri-dockerd-0.3.9.amd64.tgz $ tar zxvf cri-dockerd-0.3.9.amd64.tgz $ cd cri-dockerd $ sudo mkdir -p /usr/local/bin $ sudo install -o root -g root -m 0755 cri-dockerd/usr/local/bin/cri-dockerd $ mkdir foo; cd foo $ git clone [email protected]:Mirantis/cri-dockerd.git $ cd cri-dockerd $ sudo install packaging/systemd/* /etc/systemd/system $ sudo sed -i -e 's,/usr/bin/cri-dockerd,/usr/local/bin/cri-dockerd,' /etc/systemd/system/cri-docker.service $ sudo systemctl daemon-reload $ sudo systemctl enable --now cri-docker.socket
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expected a 32 byte SHA-256 hash, found 24 bytes
I installed cri-dockerd using this documentation https://github.com/Mirantis/cri-dockerd
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Is docker "a thing" at companies that use Kubernetes?
99% of what you just said is completely incorrect. containerd is not a facade for Docker, in fact the Docker engine is a facade for containerd. The OCI spec is also not a facade for Docker, Docker is simply one application which can create OCI compliant images which can be executed by runtimes like runc. Kubernetes has zero facades for Docker, unless you count the optional open-source cri-dockerd.
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Kubeadm cluster - no connections to services
https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/ Adjust netplan for static IP Adding br_netfilter and overlay to kernel Creating /etc/modules-load.d/k8s.conf with bridging and forwarding https://kubernetes.io/docs/setup/production-environment/container-runtimes/#forwarding-ipv4-and-letting-iptables-see-bridged-traffic Installing docker components https://kubernetes.io/docs/setup/production-environment/container-runtimes/#docker Installing cri-dockerd https://github.com/Mirantis/cri-dockerd Disabling swap https://graspingtech.com/disable-swap-ubuntu/ install kubeadm kubectl kubelet https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/
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Problems with setting up the cluster with kubeadm
Im trying to learn how to set up kubernetes cluster with kubeadm. Im using official kubernetes documentation ( maybe there is a better source?). My goal is to set it up with cri-dockerd and systemd. And to be honest its quite hard task to do it. Informations are scattered arround with links and sometimes its hard to know the order which steps should be executed. I have 2 Virtualbox machines, connected together with NAT network. A master and worker node. I performed these steps on both of them: https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/ Adjust netplan for static IP Adding br_netfilter and overlay to kernel Creating /etc/modules-load.d/k8s.conf with bridging and forwarding https://kubernetes.io/docs/setup/production-environment/container-runtimes/#forwarding-ipv4-and-letting-iptables-see-bridged-traffic Installing docker components https://kubernetes.io/docs/setup/production-environment/container-runtimes/#docker Installing cri-dockerd https://github.com/Mirantis/cri-dockerd Disabling swap install kubeadm kubectl kubelet https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/ configure kubelet cgroup driver https://kubernetes.io/docs/tasks/administer-cluster/kubeadm/configure-cgroup-driver/ So currently im at the configuring cgroup driver. I tried to execute kubeadm init kubeadm-config.yaml but kubeadm found 2 CRI endpoints. So i tried to point the correct one with this command kubeadm join --cri-socket /var/run/cri-dockerd.sock but i got discover:Invalid value: ::: bootstrapToken or file must be set And now im completely lost. And also im confused is this a moment for installing CNI (probably i will try with Calico) for pod communication or should i start the cluster first?
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Kubernetes Architecture Explained: Worker Nodes in a Cluster
But not to worry, you can still use Docker as a container runtime in Kubernetes using the cri-dockerd adapter. cri-dockerd provides a shim for Docker Engine that lets you control Docker via the Kubernetes CRI. ****
- CRI-dockerd is an adapter that provides a shim for Docker Engine that lets you control Docker via the Kubernetes Container Runtime Interface
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Kubernetes 1.24 Released: What’s New?
As of version 1.24, either one of the other supported runtimes (e.g. containerd or CRI-O) or, in case you still want to rely on Docker Engine, cri-dockerd must be used. Further information on precautions that may be necessary due to the removal of Dockershim is provided by Kubernetes in a guide.
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Podman 4.0.0
Kubernetes requires a tool which implements the Container Runtime Interface, a standardized API for starting & managing containers. This is from 2015-2016[1].
For a while Kubernetes has included something called the "dockershim", it's own implementation of a CRI interface that, under the hood, calls Docker or Podman. There's also tools like kind[2] ("kubernetes in docker") that go further- not just hosting Kubernetes worker containers in Docker, but hosting the main kubernetes daemons also in Docker.
Kubernetes deprecated Dockershim, formally in December 2020, but is just throwing the switch now in the upcoming 1.24, expected mid-April[3]. A company Mirantis has pledged to take over support of Dockershim[4], and is calling the new effort "cri-dockerd"[5]. This should allow Kubernetes workers to continue to run via Docker or Podman.
Kind is unaffected, since it runs the main Kubernetes controllers in Docker, which then launch their own opencontainerd (one off the main CRI implementations) inside that Docker container, nested like, so no dockership/cri-dockerd is needed).
[1] https://kubernetes.io/blog/2016/12/container-runtime-interfa...
[2] https://kind.sigs.k8s.io/
[3] https://kubernetes.io/blog/2022/01/07/kubernetes-is-moving-o...
[4] https://www.mirantis.com/blog/mirantis-to-take-over-support-...
[5] https://github.com/Mirantis/cri-dockerd
runtime-spec
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The What, Why and How of Containers
> Well, no. When people say "containers", they always mean "Docker".
Not really/necessarily. https://github.com/opencontainers/runtime-spec
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Containers - entre historia y runtimes
Otras iniciativas empezaron a surgir debido a la alta popularidad de los containers y debido a esto, en 2015 se crea OCI(Open Container Initiative) para definir un estandar para containers(runtimes e imagenes).
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Docker is deleting Open Source organisations - what you need to know
Theoretically there could be a lot of new options that pop up. There is an Open Container Initiative that has a Runtime Specification that can be implemented. youki is one example of an OCI-compliant container runtime.
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Container Deep Dive Part 1: Container Runtime
Open Container Initiative Runtime Specification aims to specify the configuration, execution environment, and lifecycle of a container. Source
- Podman + minikube
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Podman/buildah oci bundle
How I can generate oci bundle that can be run with systemd-nspawn? I've tried podman/buildah push, but generated directory/archive is not an oci bundle (https://github.com/opencontainers/runtime-spec/blob/main/bundle.md). I've tried podman image mount, but config.json file is nowhere to be found. It looks like I am missing something simple.
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Youki, a container runtime written in Rust that has passed all integration tests provided by OCI(Open Container Initiative).
In more detail, runC and youki need to implement this specification. https://github.com/opencontainers/runtime-spec
- Youki – OCI container runtime with support for cgroup2 written in Rust
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Kubernetes vs Docker: Understanding Containers in 2021
A runtime specification that describes how to unpack and run a container. OCI maintains a reference implementation called runc. Both containerd and CRI-O use runc in the background to spawn containers.
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Experimental implementation of container runtime in Rust
The immediate goal of this project(youki) is to pass all the default tests of the runtime-spec that the opencontainers is making. Of course, this is for my own learning, but I believe Rust is one of the best languages to implement a container runtime.
What are some alternatives?
containerd - An open and reliable container runtime
youki - A container runtime written in Rust
cri-o - Open Container Initiative-based implementation of Kubernetes Container Runtime Interface
podman - Podman: A tool for managing OCI containers and pods.
compose-cli - Easily run your Compose application to the cloud with compose-cli
nerdctl - contaiNERD CTL - Docker-compatible CLI for containerd, with support for Compose, Rootless, eStargz, OCIcrypt, IPFS, ...
mariadb-podman-socket-activation - Demo of a templated systemd user service that runs rootless Podman and starts MariaDB with socket activation
runc - CLI tool for spawning and running containers according to the OCI specification
enhancements - Enhancements tracking repo for Kubernetes
crun - A fast and lightweight fully featured OCI runtime and C library for running containers