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Tamás Gérczei 3 weeks ago
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README.md View File

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# 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
ssh master1 bash -xs < k8s-ubuntu-install<br>
ssh worker1 bash -xs < k8s-ubuntu-install
## generic installation procedure
- kubeadm init on <strong>master1</strong>
- kubeadm join on <strong>worker1</strong>
# UPGRADE
## when upgrading point releases
export K8S_VERSION_CURRENT=$(kc version --short | awk '/^Server/{print substr($3,2)}')<br>
export K8S_VERSION_LATEST=$(curl -sL https://dl.k8s.io/release/stable-${K8S_VERSION_CURRENT%.*}.txt)
## otherwise
export K8S_VERSION_MAJOR=1<br>
export K8S_VERSION_LATEST=$(curl -sL https://dl.k8s.io/release/stable-${K8S_VERSION_MAJOR}.txt)
### control plane first
kubectl drain master1 --ignore-daemonsets --delete-local-data<br>
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<br>
kubectl uncordon master1<br>
sleep 60<br>
ssh master1 sudo docker image prune -af
### workload plane, workers one by one
kubectl drain worker1 --ignore-daemonsets --delete-local-data<br>
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<br>
kubectl uncordon worker1<br>
sleep 60<br>
ssh worker1 sudo docker image prune -af

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k8s-ubuntu-install View File

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sudo apt-get update && sudo apt-get install -y apt-transport-https curl
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
cat <<EOF | sudo tee /etc/apt/sources.list.d/kubernetes.list
deb https://apt.kubernetes.io/ kubernetes-xenial main
EOF
sudo apt-get update
sudo apt-get install -y kube{let,adm,ctl} docker.io
sudo apt-mark hold kube{let,adm,ctl,rnetes-cni}
sudo systemctl enable --now docker
sudo gpasswd -a ubuntu docker

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k8s-ubuntu-update-master View File

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if [ ${K8S_VERSION_CURRENT:-v0.0.0} = ${K8S_VERSION_LATEST#v} ];
then
echo nothing to do
exit 0
fi
sudo apt install -y kubeadm=${K8S_VERSION_LATEST#v}-00
sudo kubeadm upgrade apply -y ${K8S_VERSION_LATEST}
sudo apt install -y kube{let,ctl}=${K8S_VERSION_LATEST#v}-00
sudo apt autoremove -y
sudo apt autoclean
sudo journalctl --vacuum-time=3d
#sudo docker image prune -af

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k8s-ubuntu-update-os View File

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sudo apt-mark hold kube{adm,let,ctl,rnetes-cni}
sudo apt upgrade -y
sudo apt-mark unhold kube{adm,let,ctl,rnetes-cni}
sudo shutdown -r now

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k8s-ubuntu-update-worker View File

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if [ ${K8S_VERSION_CURRENT:-v0.0.0} = ${K8S_VERSION_LATEST#v} ];
then
echo nothing to do
exit 0
fi
sudo apt install -y kubeadm=${K8S_VERSION_LATEST#v}-00
sudo kubeadm upgrade node
sudo apt install -y kube{let,ctl}=${K8S_VERSION_LATEST#v}-00
sudo apt autoremove -y
sudo apt autoclean
sudo journalctl --vacuum-time=3d
#sudo docker image prune -af

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