【转】ubuntu20.04安装k8s（适用于任何版本的kubernetes安装）

环境初始化

#关闭swap
swapoff -a
rm -f /swap.img
vim /etc/fstab
# /swap.img

#开启ip转发
vim /etc/sysctl.conf
net.ipv4.ip_forward=1

#查看状态
sysctl -p

安装docker

• 安装依赖

sudo apt-get update
sudo apt-get -y install apt-transport-https ca-certificates curl software-properties-common

• 安装GPG证书

curl -fsSL https://mirrors.aliyun.com/docker-ce/linux/ubuntu/gpg | sudo apt-key add -

• 写入软件源信息

sudo add-apt-repository "deb [arch=amd64] https://mirrors.aliyun.com/docker-ce/linux/ubuntu $(lsb_release -cs) stable"

• 更新并安装Docker-ce

sudo apt-get -y update
apt install -y docker-ce

• 安装docker-compose

apt install -y docker-compose

• 将docker设置为开机自启

systemctl enable docker

安装K8S

• 添加证书

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

• 添加apt源

cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
deb https://mirrors.aliyun.com/kubernetes/apt/ kubernetes-xenial main
EOF  

apt-get update

• 查看可安装版本

apt-cache madison kubelet

• 安装指定版本

apt-get install -y kubelet=1.18.4-00 kubeadm=1.18.4-00 kubectl=1.18.4-00

• 设置开机启动

sudo systemctl enable kubelet && sudo systemctl start kubelet

• 查看所需镜像

kubeadm config images list --kubernetes-version=v1.18.4

k8s.gcr.io/kube-apiserver:v1.18.4
k8s.gcr.io/kube-controller-manager:v1.18.4
k8s.gcr.io/kube-scheduler:v1.18.4
k8s.gcr.io/kube-proxy:v1.18.4
k8s.gcr.io/pause:3.2
k8s.gcr.io/etcd:3.4.3-0
k8s.gcr.io/coredns:1.6.7

• 从新地址下载镜像

docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.18.4
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.18.4
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.18.4
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.18.4
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.2
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.4.3-0
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.6.7

• 为镜像重新打tag

docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.18.4 k8s.gcr.io/kube-apiserver:v1.18.4
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.18.4 k8s.gcr.io/kube-controller-manager:v1.18.4
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.18.4 k8s.gcr.io/kube-scheduler:v1.18.4
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.18.4 k8s.gcr.io/kube-proxy:v1.18.4
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.2 k8s.gcr.io/pause:3.2
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.4.3-0 k8s.gcr.io/etcd:3.4.3-0
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.6.7 k8s.gcr.io/coredns:1.6.7

• 初始化master节点

kubeadm init --kubernetes-version=v1.18.4 --pod-network-cidr=10.244.0.0/16 --service-cidr=10.96.0.0/12 --ignore-preflight-errors=Swap

• 配置kubeconfig

从上一步的回显中，创建目录并保存kubeconfig

• 查看组件状态

kubectl get componentstatus

• 添加网络组件

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

• 检查状态

kubectl get nodes

来源：https://blog.csdn.net/professorman/article/details/118150688