59 lines
1.9 KiB
Markdown
59 lines
1.9 KiB
Markdown
# scripts to deploy / upgrade Kubernetes lab clusters on Ubuntu
|
|
|
|
### I use Ubuntu (Server 20.04) in order to make use of up-to-date cluster and kernel packages.
|
|
|
|
# ASSUMPTIONS
|
|
- 2+ available role-dedicated lab nodes (ideally 1 master and 2+ workers) running Ubuntu (I use 4 (1+3) KVM guest domains created via libvirt, YMMV)
|
|
- SSH access to all nodes with pubkey auth
|
|
- sudo as root without password
|
|
- variables named <i>K8S_VERSION_*</i> sent and accepted via SSH
|
|
- one doesn't know Ansible (half-joking there, this is more of an educational, "quick 'n' dirty" effort)
|
|
- one knows there are other, possibly better ways
|
|
|
|
# INSTALLATION
|
|
```bash
|
|
ssh master1 bash -xs < k8s-ubuntu-install
|
|
ssh worker1 bash -xs < k8s-ubuntu-install
|
|
```
|
|
|
|
## generic installation procedure
|
|
- kubeadm init on <strong>master1</strong>
|
|
- kubeadm join on <strong>worker1</strong>
|
|
|
|
# UPGRADE
|
|
```bash
|
|
## when upgrading point releases
|
|
export K8S_VERSION_CURRENT=$(kubectl version --short | awk '/^Server/{print substr($3,2)}')
|
|
export K8S_VERSION_LATEST=$(curl -sL https://dl.k8s.io/release/stable-${K8S_VERSION_CURRENT%.*}.txt)
|
|
|
|
## otherwise
|
|
export K8S_VERSION_MAJOR=1
|
|
export K8S_VERSION_LATEST=$(curl -sL https://dl.k8s.io/release/stable-${K8S_VERSION_MAJOR}.txt)
|
|
|
|
### control plane first
|
|
kubectl drain master1 --ignore-daemonsets --delete-local-data
|
|
ssh master1 sudo apt update
|
|
|
|
### when upgrading the OS
|
|
ssh master1 bash -xs < k8s-ubuntu-update-os
|
|
|
|
### otherwise
|
|
ssh master1 bash -xs < k8s-ubuntu-update-master
|
|
kubectl uncordon master1
|
|
sleep 60
|
|
ssh master1 sudo docker image prune -af
|
|
|
|
### workload plane, workers one by one
|
|
kubectl drain worker1 --ignore-daemonsets --delete-local-data
|
|
ssh worker1 sudo apt update
|
|
|
|
### when upgrading the OS
|
|
ssh worker1 bash -xs < k8s-ubuntu-update-os
|
|
|
|
### otherwise
|
|
ssh worker1 bash -xs < k8s-ubuntu-update-worker
|
|
kubectl uncordon worker1
|
|
sleep 60
|
|
ssh worker1 sudo docker image prune -af
|
|
```
|