Ubuntu 20.04 安装k8s

1、配置源

修改Sources.list

可以打开 /etc/apt/sources.list 文件，添加一行
deb https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial main

或者在/etc/apt/sources.list.d下添加一个文件

kubernetes.list

文件内容

deb https://mirrors.aliyun.com/kubernetes/apt/ kubernetes-xenial main

2、执行apt-get update，如果出现
The following signatures couldn’t be verified because the public key is not available

需要添加key

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

3、开始安装

apt-get install -y kubelet kubeadm kubectl --allow-unauthenticated

4、执行kubeadm init 

 提示资源不足，修改cpu,Ram，disable  swap 

5、swapoff -a

6、从新执行

kubeadm init

后面一直卡着，新建一个sh 文件，内容如下

#!/bin/bash
docker pull mirrorgooglecontainers/kube-apiserver:v1.13.3
docker pull mirrorgooglecontainers/kube-controller-manager:v1.13.3
docker pull mirrorgooglecontainers/kube-scheduler:v1.13.3
docker pull mirrorgooglecontainers/kube-proxy:v1.13.3
docker pull mirrorgooglecontainers/pause:3.1
docker pull mirrorgooglecontainers/etcd:3.2.24
docker pull coredns/coredns:1.2.6
docker tag mirrorgooglecontainers/kube-proxy:v1.13.3  k8s.gcr.io/kube-proxy:v1.13.3
docker tag mirrorgooglecontainers/kube-scheduler:v1.13.3 k8s.gcr.io/kube-scheduler:v1.13.3
docker tag mirrorgooglecontainers/kube-apiserver:v1.13.3 k8s.gcr.io/kube-apiserver:v1.13.3
docker tag mirrorgooglecontainers/kube-controller-manager:v1.13.3 k8s.gcr.io/kube-controller-manager:v1.13.3
docker tag mirrorgooglecontainers/etcd:3.2.24  k8s.gcr.io/etcd:3.2.24
docker tag coredns/coredns:1.2.6 k8s.gcr.io/coredns:1.2.6
docker tag mirrorgooglecontainers/pause:3.1  k8s.gcr.io/pause:3.1
docker rmi mirrorgooglecontainers/kube-apiserver:v1.13.3
docker rmi mirrorgooglecontainers/kube-controller-manager:v1.13.3
docker rmi mirrorgooglecontainers/kube-scheduler:v1.13.3
docker rmi mirrorgooglecontainers/kube-proxy:v1.13.3
docker rmi mirrorgooglecontainers/pause:3.1
docker rmi mirrorgooglecontainers/etcd:3.2.24
docker rmi coredns/coredns:1.2.6:q　　

执行

7、初始化镜像

kubeadm init --kubernetes-version=v1.13.3 --pod-network-cidr=10.244.0.0/16

无法执行，卸载kubeadm等

apt-get remove  -y kubelet kubeadm kubectl

8、再安装

apt-get install -y kubernetes-cni=0.6.0-00 --allow-downgrades

 apt-get install -y   kubectl=1.13.3-00    --allow-downgrades  --allow-unauthenticated

apt-get install -y kubelet=1.13.3-00 kubeadm=1.13.3-00 --allow-unauthenticated　

9、从新执行第7步操作

kubeadm init --kubernetes-version=v1.13.3 --pod-network-cidr=10.244.0.0/16

10、如果在使用过程中出现

The connection to the server localhost:xxx  was refused - did you specify the right host or port?

 export KUBECONFIG=/etc/kubernetes/admin.conf