Install K3S on CentOS8

From Bitbull Wiki
Jump to navigation Jump to search

1 VM Setup

1.1 VM requirements

Just setup a CentOS8 minimal VM with the following requirements

  • OS: centos8 minimal
  • CPU: 2
  • MEM: 8GB (6 GB may work as well)
  • DISK: 40G (7GB used on a fresh setup)

1.2 Prepare OS

dnf -y upgrade
dnf -y install setroubleshoot-server curl lsof wget tar
sed -i  '/swap/d' /etc/fstab
swapoff -a
firewall-cmd --permanent --zone=public --add-service=https
firewall-cmd --zone=public --add-masquerade --permanent
firewall-cmd --reload

2 Setup K3S

curl -sfL | sh
cat /etc/systemd/system/k3s.service
systemctl status k3s
kubectl get nodes
# all pods in running state? fine!
kubectl get pods --all-namespaces

3 DNS for Wildcard Ingress

  • Create a CNAME
*.vm-name.domain.tld -> vm-name.domain.tld

4 Helm Install

curl | sh
grep 'helm completion bash' $HOME/.bashrc || echo 'source <(helm completion bash)' >> $HOME/.bashrc
grep KUBECONFIG $HOME/.bashrc || echo 'export KUBECONFIG=/etc/rancher/k3s/k3s.yaml' >> $HOME/.bashrc

4.1 .bash_profile

  • kubectl project/user prompt
source <(kubectl completion bash)
export PS1='### \D{%d.%m.%Y_%H:%M} \u@\e[1;32m\h\e[m:\w \e[1;33m✯ $(kubectl config view -o jsonpath="{.contexts[].context.namespace}")\e[m \n# '
  • password gen
genpasswd() {
   local l=$1
   [ "$l" == "" ] && l=16
   tr -dc A-Za-z0-9_=., < /dev/urandom | head -c ${l} | xargs