install k8s with kubeadm

readme.md

hello

install-k8s-kubeadm.sh

## containerd prereq
modprobe br_netfilter
modprobe overlay

cat <<EOF | sudo tee /etc/modules-load.d/containerd.conf
overlay
br_netfilter
EOF

cat <<EOF | sudo tee /etc/sysctl.d/99-kubernetes-cri.conf
net.bridge.bridge-nf-call-iptables  = 1
net.ipv4.ip_forward                 = 1
net.bridge.bridge-nf-call-ip6tables = 1
EOF
sysctl --system

## install containerd
curl -fsSL https://download.docker.com/linux/debian/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
echo   "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/debian \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

apt-get update -qq
apt-get install -y containerd.io
mkdir -p /etc/containerd
containerd config default | sudo tee /etc/containerd/config.toml
systemctl restart containerd

## install kubeadm/kubelet/kubectl
curl -fsSLo /usr/share/keyrings/kubernetes-archive-keyring.gpg https://packages.cloud.google.com/apt/doc/apt-key.gpg
echo "deb [signed-by=/usr/share/keyrings/kubernetes-archive-keyring.gpg] https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list
apt-get update -qq
apt-get install -y kubelet kubeadm kubectl

## create basic k8s installation
kubeadm init --pod-network-cidr=10.244.0.0/16 --ignore-preflight-errors=FileContent--proc-sys-net-ipv4-ip_forward

## install CNI: flannel
kubectl --kubeconfig=/etc/kubernetes/admin.conf apply -f https://raw.githubusercontent.com/flannel-io/flannel/master/Documentation/kube-flannel.yml

## untaint master node to be a worker
kubectl --kubeconfig=/etc/kubernetes/admin.conf taint node --all node-role.kubernetes.io/master:NoSchedule-

## setup completion
apt-get install -y bash-completion

apt-get install -y bash-completion
kubeadm completion bash > /etc/bash_completion.d/kubeadm
kubectl completion bash > /etc/bash_completion.d/kubectl
echo 'complete -o default -F __start_kubectl k' > /etc/bash_completion.d/k

## setup root profile
cat >>/root/.bashrc <<EOF
alias k=kubectl
alias ll='ls -la'
export KUBECONFIG=/etc/kubernetes/admin.conf
EOF

nginx.yaml

apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    run: web
  name: web
spec:
  containers:
  - image: nginx
    name: web
    ports:
    - containerPort: 80
    resources: {}
  dnsPolicy: ClusterFirst
  restartPolicy: Always
status: {}
---
apiVersion: v1
kind: Service
metadata:
  creationTimestamp: null
  labels:
    run: web
  name: web
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: 80
    nodePort: 30080
  selector:
    run: web
  type: NodePort