K3s on a Centos vm
This post is about installing lightweight Kubernetes (K3s) on our new vm.
The previous post was all about being able to install Kubernetes quickly. For that I will use k3s from Rancher because it is fast. Let's go!
We do this for testing so we can safely disable the firewall and SELinux on our CentOS vm. This is because SELinux is still experimental in K3s. We also need to enable ssh password authentication so we can issue scp commands from our host machine. For this we just add the following lines to the extra script part of our Vagrantfile:
$extra = <<-EXTRA dnf update -y && dnf install vim net-tools git lsof tar -y sed -i 's/enforcing/disabled/g' /etc/selinux/config sed -i 's/PasswordAuthentication\s.*no/PasswordAuthentication yes/g' /etc/ssh/sshd_config systemctl disable firewalld systemctl restart sshd reboot EXTRA Vagrant.configure("2") do |config| config.vm.define "node01" do |node01_config| node01_config.vm.box ="generic/centos8" node01_config.vm.hostname = "centos01" node01_config.vm.provider :libvirt do |domain| domain.memory = 4096 domain.cpus = 2 domain.nested = true domain.volume_cache = 'none' end end config.vm.provision "shell", inline: $extra end
Now log on the the virtual machine and issue these commands:
curl -sfL https://get.k3s.io | sh -s - --write-kubeconfig-mode 644 sudo cp /etc/rancher/k3s/k3s.yaml ~/.kube/config
Now wait a bit. Once ready, you can issue:
kubectl get pods --all-namespaces
Manage K3s from the host
scp email@example.com:/home/vagrant/.kube/config .
Edit the config and change the 127.0.0.1 address from the server to the ip address of your vm. (Mine is 192.168.122.232)
kubectl get pods --kubeconfig config --all-namespaces