k8s/k3s/k3d

• k3s is light weight kubernetes from Rancher, that combines most of the k8s management components into singe go binary.
  • This allows for low memory footprint and makes it usable on small systems e.g. Raspbery Pi4
• k3d is docker version of k3s, great for local testing with multiple masters and workers.
  • One gotcha (2021-11) is that on btrfs, it needs access to /dev/mapper

  • install k3d https://k3d.io

    curl -s https://raw.githubusercontent.com/rancher/k3d/main/install.sh | bash

  • After installing k3d and docker, Run with

    k3d cluster create test -s 3 -a 3 -v /dev/mapper:/dev/mapper

  • Then the normal kubectl can be used to operate the docker k8s cluster

  • Installed using apt

    $ kubectl get nodes
    NAME                STATUS   ROLES                       AGE    VERSION
    k3d-test-agent-0    Ready    <none>                      74s    v1.22.6+k3s1
    k3d-test-agent-1    Ready    <none>                      74s    v1.22.6+k3s1
    k3d-test-agent-2    Ready    <none>                      74s    v1.22.6+k3s1
    k3d-test-server-0   Ready    control-plane,etcd,master   111s   v1.22.6+k3s1
    k3d-test-server-1   Ready    control-plane,etcd,master   94s    v1.22.6+k3s1
    k3d-test-server-2   Ready    control-plane,etcd,master   79s    v1.22.6+k3s1
    ~$ 

CategoryK8sKubernetes