Docker

In order to quicly bring up a new kubernetes cluster in your local laptop, then you can use kind. Kind ( Kubernetes in Docker) Kind basically creates the nodes as a containers and create a kubernetes cluster https://kind.sigs.k8s.io/ https://github.com/kubernetes-sigs/kind brew install kind Deploying a Single node cluster kind create cluster docker images kindest/node <none> d372b674475a 3 months ago 1.1GB docker ps -a 3047fe4988f4 kindest/node:v1.21.1 "/usr/local/bin/entr…" 8 days ago Up 8 days 127.0.0.1:50941->6443/tcp kind-control-plane docker exec -it kind-control-plane sh # crictl ps -a CONTAINER IMAGE CREATED STATE NAME ATTEMPT POD ID be7d88399e276 1a1f05a2cd7c2 8 days ago Running coredns 0 bb3eb2d8b0138 dc91af853f8d4 1a1f05a2cd7c2 8 days ago Running coredns 0 72e459f147b24 2bcbac91131f1 2b703ea309660 8 days ago Running local-path-provisioner 0 1b9b5b3329128 3787410dc6121 f37b7c809e5dc 8 days ago Running kindnet-cni 0 66b72ef1c9758 af1073c036c7b 4bbef4ca108cd 8 days ago Running kube-proxy 0 e254cfacdfb75 b29d7fa01b9ea 05b738aa1bc63 8 days ago Running etcd 0 4109caeae008c cb638fbd4988d 18e61c783b417 8 days ago Running kube-apiserver 0 f87bb12d4816e 181e0b63e3db1 0c6dccae49de8 8 days ago Running kube-controller-manager 0 0d00a01acb283 ccd3b21c436ec 8c783dd252088 8 days ago Running kube-scheduler 0 72a8570b0c0b2 kubectl get cluster-info ...

With the removal docker as the default container runtime in kubernetes. When a situation arises where you need to debug the container application container You can use Crictl and Nerdctl and debug the issue quickly Crictl Install crictl VERSION="v1.22.0" wget https://github.com/kubernetes-sigs/cri-tools/releases/download/$VERSION/crictl-$VERSION-linux-amd64.tar.gz sudo tar zxvf crictl-$VERSION-linux-amd64.tar.gz -C /usr/local/bin Create a endpoint configuration file (crictl.yaml) Example To interact with containerd runtime env cat /etc/crictl.yaml runtime-endpoint: unix:///run/containerd/containerd.sock image-endpoint: unix:///run/containerd/containerd.sock timeout: 2 debug: false pull-image-on-create: false To interact with docker runtime cat /etc/crictl.yaml runtime-endpoint: unix:///var/run/dockershim.sock image-endpoint: unix:///var/run/dockershim.sock timeout: 2 debug: false pull-image-on-create: false To interact with Crio runtime cat /etc/crictl.yaml runtime-endpoint: unix:///run/crio/crio.sock image-endpoint: unix:///run/crio/crio.sock timeout: 2 debug: false Execute the crictl commands Example: ...