k8s安装实践

一，环境：unbantu20.4

　　(低版本unbantu,可能会出现kubelet启不来的情况)

二，安装docker

Install docker
```
apt install docker.io
```

Update cgroupdriver to systemd

vi /etc/docker/daemon.json
{
  "exec-opts": ["native.cgroupdriver=systemd"]
}
systemctl daemon-reload
systemctl restart docker

三，kubeadm安装k8s

Letting iptables see bridged traffic

$ cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
br_netfilter
EOF

$ cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
$ sudo sysctl --system

Update the apt package index and install packages needed to use the Kubernetes apt repository:

$ sudo apt-get update
$ sudo apt-get install -y apt-transport-https ca-certificates curl

Install kubeadm

$ sudo curl -s https://mirrors.aliyun.com/kubernetes/apt/doc/apt-key.gpg | sudo apt-key add -

Add the Kubernetes apt repository

$ sudo tee /etc/apt/sources.list.d/kubernetes.list <<-'EOF'
deb https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial main
EOF

Update apt package index, install kubelet, kubeadm and kubectl

$ sudo apt-get update
$ sudo apt-get install -y kubelet kubeadm kubectl
$ sudo apt-mark hold kubelet kubeadm kubectl

kubeadm init

$ kubeadm init --image-repository registry.aliyuncs.com/google_containers --kubernetes-version v1.23.3 --pod-network-cidr=192.168.0.0/16 --apiserver-cert-extra-sans=<服务器外网ip>

Copy kubeconfig

$ sudo mkdir -p $HOME/.kube
$ sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
$ sudo chown $(id -u):$(id -g) $HOME/.kube/config

Untaint master

$ kubectl taint nodes --all node-role.kubernetes.io/master-

Install calico cni plugin

https://docs.projectcalico.org/getting-started/kubernetes/quickstart

$ kubectl create -f http://docs.projectcalico.org/manifests/tigera-operator.yaml
$ kubectl create -f http://docs.projectcalico.org/manifests/custom-resources.yaml