k8s与aws--在ec2中部署高可用k8s1.13.1集群(ipvs,cloud-provider)

前言

kubeadm1.13达到了生产可用，利用kubeadm部署一个高可用集群简单不少。但是竟然部署在aws上，就要启用cloud-provider=aws，深度结合iaas层资源。主要是利用aws的elb和ebs等。相关的资料还是比较少的，已经有的一些文档要不是out了，要不就是内容不全，还有很多文章只是弄了一个demo的水平，完全没法上生产，部署过程破费周折。

组件版本和集群环境

集群组件和版本

Kubernetes 1.13.1
Docker 18.06.0-ce
Etcd 3.2.24
Calico 3.4.0 网络

集群机器

master:

172.31.22.208
172.31.17.44
172.31.22.135

node:

172.31.29.58

PS

etcd集群非容器部署，systemd守护
三台master主机配置ssh免密登录

主机设置

关闭防火墙

systemctl stop firewalld
systemctl disable firewalld

禁用selinux

# Set SELinux in permissive mode (effectively disabling it)
setenforce 0
sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config

启用net.bridge.bridge-nf-call-ip6tables和net.bridge.bridge-nf-call-iptables

cat <<EOF >  /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
vm.swappiness=0
EOF
sysctl --system

禁用swap

swapoff -a

修改/etc/fstab 文件，注释掉 SWAP 的自动挂载.
使用free -m确认swap已经关闭。

加载ipvs相关模块

at > /etc/sysconfig/modules/ipvs.modules <<EOF
#!/bin/bash
modprobe -- ip_vs
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- ip_vs_sh
modprobe -- nf_conntrack_ipv4
EOF
chmod 755 /etc/sysconfig/modules/ipvs.modules && bash /etc/sysconfig/modules/ipvs.modules && lsmod | grep -e ip_vs -e nf_conntrack_ipv4

上面脚本创建了的/etc/sysconfig/modules/ipvs.modules文件，保证在节点重启后能自动加载所需模块。使用lsmod | grep -e ip_vs -e nf_conntrack_ipv4命令查看是否已经正确加载所需的内核模块。

接下来还需要确保各个节点上已经安装了ipset软件包yum install ipset。为了便于查看ipvs的代理规则，最好安装一下管理工具ipvsadm yum install ipvsadm。

赋予IAM权限

Master Policy

  {
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "autoscaling:DescribeAutoScalingGroups",
        "autoscaling:DescribeLaunchConfigurations",
        "autoscaling:DescribeTags",
        "ec2:DescribeInstances",
        "ec2:DescribeRegions",
        "ec2:DescribeRouteTables",
        "ec2:DescribeSecurityGroups",
        "ec2:DescribeSubnets",
        "ec2:DescribeVolumes",
        "ec2:CreateSecurityGroup",
        "ec2:CreateTags",
        "ec2:CreateVolume",
        "ec2:ModifyInstanceAttribute",
        "ec2:ModifyVolume",
        "ec2:AttachVolume",
        "ec2:AuthorizeSecurityGroupIngress",
        "ec2:CreateRoute",
        "ec2:DeleteRoute",
        "ec2:DeleteSecurityGroup",
        "ec2:DeleteVolume",
        "ec2:DetachVolume",
        "ec2:RevokeSecurityGroupIngress",
        "ec2:DescribeVpcs",
        "elasticloadbalancing:AddTags",
        "elasticloadbalancing:AttachLoadBalancerToSubnets",
        "elasticloadbalancing:ApplySecurityGroupsToLoadBalancer",
        "elasticloadbalancing:CreateLoadBalancer",
        "elasticloadbalancing:CreateLoadBalancerPolicy",
        "elasticloadbalancing:CreateLoadBalancerListeners",
        "elasticloadbalancing:ConfigureHealthCheck",
        "elasticloadbalancing:DeleteLoadBalancer",
        "elasticloadbalancing:DeleteLoadBalancerListeners",
        "elasticloadbalancing:DescribeLoadBalancers",
        "elasticloadbalancing:DescribeLoadBalancerAttributes",
        "elasticloadbalancing:DetachLoadBalancerFromSubnets",
        "elasticloadbalancing:DeregisterInstancesFromLoadBalancer",
        "elasticloadbalancing:ModifyLoadBalancerAttributes",
        "elasticloadbalancing:RegisterInstancesWithLoadBalancer",
        "elasticloadbalancing:SetLoadBalancerPoliciesForBackendServer",
        "elasticloadbalancing:AddTags",
        "elasticloadbalancing:CreateListener",
        "elasticloadbalancing:CreateTargetGroup",
        "elasticloadbalancing:DeleteListener",
        "elasticloadbalancing:DeleteTargetGroup",
        "elasticloadbalancing:DescribeListeners",
        "elasticloadbalancing:DescribeLoadBalancerPolicies",
        "elasticloadbalancing:DescribeTargetGroups",
        "elasticloadbalancing:DescribeTargetHealth",
        "elasticloadbalancing:ModifyListener",
        "elasticloadbalancing:ModifyTargetGroup",
        "elasticloadbalancing:RegisterTargets",
        "elasticloadbalancing:SetLoadBalancerPoliciesOfListener",
        "iam:CreateServiceLinkedRole",
        "kms:DescribeKey"
      ],
      "Resource": [
        "*"
      ]
    },
  ]
}

Node Policy

  {
      "Version": "2012-10-17",
      "Statement": [
          {
              "Effect": "Allow",
              "Action": [
                  "ec2:DescribeInstances",
                  "ec2:DescribeRegions",
                  "ecr:GetAuthorizationToken",
                  "ecr:BatchCheckLayerAvailability",
                  "ecr:GetDownloadUrlForLayer",
                  "ecr:GetRepositoryPolicy",
                  "ecr:DescribeRepositories",
                  "ecr:ListImages",
                  "ecr:BatchGetImage",
                  "sts:AssumeRole"
              ],
              "Resource": "*"
          } 
      ]
  }

tag标签

需要为ec2实例, route table, subnet，安全组打下面的标签：

kubernetes.io/cluster/<cluster-name>="owned"

cluster-name命名规范：

k8s-{region}-{env}-{num}
例如：
k8s-usa-west-2-test-1

安装docker和kubeadm

安装指定版本docker

安装docker

yum install docker-18.06.1ce-5.amzn2 -y

systemctl enable docker

更改docker Root Dir 目录

将/var/lib/dokcer 配置到/data/docker,确保/data是另外挂载的数据盘

更改 ‘/etc/sysconfig/docker’ 文件:

OPTIONS="--default-ulimit nofile=1024:4096 -g /data/docker"

更改 /etc/docker/daemon.json:

cat >  /etc/docker/daemon.json <<EOF
{
 "data-root": "/data/docker"
}
EOF

验证

[root@ip-172-31-22-208 ~]# ls -lrt /var/lib/docker
总用量 0
[root@ip-172-31-22-208 ~]# ls -lrt /data/docker/
总用量 0
drwx------ 3 root root 20 12月 11 10:44 containerd
drwx------ 2 root root  6 12月 11 10:44 tmp
drwx------ 2 root root  6 12月 11 10:44 runtimes
drwx------ 4 root root 32 12月 11 10:44 plugins
drwx------ 2 root root  6 12月 11 10:44 containers
drwx------ 2 root root 25 12月 11 10:44 volumes
drwx------ 3 root root 22 12月 11 10:44 image
drwx------ 2 root root  6 12月 11 10:44 trust
drwxr-x--- 3 root root 19 12月 11 10:44 network
drwx------ 3 root root 40 12月 11 10:44 overlay2
drwx------ 2 root root  6 12月 11 10:44 swarm
drwx------ 2 root root 24 12月 11 10:44 builder
drwx------ 4 root root 92 12月 11 10:44 buildkit

重启docker 服务

systemctl start docker

验证docker：

root@ip-172-31-22-208 ~]# docker info
Containers: 0
 Running: 0
 Paused: 0
 Stopped: 0
Images: 0
Server Version: 18.06.1-ce
Storage Driver: overlay2
 Backing Filesystem: xfs
 Supports d_type: true
 Native Overlay Diff: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
 Volume: local
 Network: bridge host macvlan null overlay
 Log: awslogs fluentd gcplogs gelf journald json-file logentries splunk syslog
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 468a545b9edcd5932818eb9de8e72413e616e86e
runc version: 69663f0bd4b60df09991c08812a60108003fa340
init version: fec3683
Security Options:
 seccomp
  Profile: default
Kernel Version: 4.14.70-72.55.amzn2.x86_64
Operating System: Amazon Linux 2
OSType: linux
Architecture: x86_64
CPUs: 4
Total Memory: 15.67GiB
Name: ip-172-31-22-208.us-west-2.compute.internal
ID: CG7S:P5XD:FLU6:MULI:2TSI:OLRY:A6EX:SM3D:FXNB:CMEQ:MU6R:XSCW
Docker Root Dir: /data/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
Labels:
Experimental: false
Insecure Registries:
 127.0.0.0/8
Live Restore Enabled: false

安装kubeadm等

增加k8s repo

cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=0
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
exclude=kube*
EOF

安装kubeadm, kubelet, kubectl

yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes

systemctl enable kubelet && systemctl start kubelet

验证kubeadm版本

[root@ip-172-31-22-208 ~]# kubeadm version
kubeadm version: &version.Info{Major:"1", Minor:"13", GitVersion:"v1.13.0", GitCommit:"ddf47ac13c1a9483ea035a79cd7c10005ff21a6d", GitTreeState:"clean", BuildDate:"2018-12-03T21:02:01Z", GoVersion:"go1.11.2", Compiler:"gc", Platform:"linux/amd64"}

更新 kubelet config

设置节点预留资源 ,同时为了支持 cloud-provider，首先需要在 kubelet 的配置里做相应修改，为 /etc/sysconfig/kubelet 添加 KUBELET_EXTRA_ARGS:

KUBELET_EXTRA_ARGS=--cloud-provider=aws

预留资源

设置cgroups

mkdir -p /sys/fs/cgroup/cpu/system.slice/kubelet.service
mkdir -p /sys/fs/cgroup/cpuacct/system.slice/kubelet.service
mkdir -p /sys/fs/cgroup/cpuset/system.slice/kubelet.service
mkdir -p /sys/fs/cgroup/memory/system.slice/kubelet.service
mkdir -p /sys/fs/cgroup/devices/system.slice/kubelet.service
mkdir -p /sys/fs/cgroup/blkio/system.slice/kubelet.service
mkdir -p /sys/fs/cgroup/hugetlb/system.slice/kubelet.service
mkdir -p /sys/fs/cgroup/systemd/system.slice/kubelet.service

在/var/lib/kubelet/config.yaml中添加如下：

enforceNodeAllocatable:
- pods
- kube-reserved
- system-reserved
kubeReservedCgroup: /system.slice/kubelet.service
systemReservedCgroup: /system.slice
systemReserved:
  cpu: 500m
  memory: 1Gi
  ephemeral-storage: 5Gi
kubeReserved:
  cpu: 500m
  memory: 1Gi
  ephemeral-storage: 5Gi

部署高可用 etcd 集群

kuberntes 系统使用 etcd 存储所有数据，本文档介绍部署一个三节点高可用 etcd 集群的步骤，这三个节点复用 kubernetes master 机器，分别命名为etcd-host0、etcd-host1、etcd-host2：

infra0: 172.31.22.208
infra1: 172.31.17.44
infra2: 172.31.22.135

使用的变量

本文档用到的变量定义如下：

export NODE_NAME=infra0 # 当前部署的机器名称(随便定义，只要能区分不同机器即可)
export NODE_IP=172.31.22.208 # 当前部署的机器 IP
export NODE_IPS="172.31.22.208 172.31.17.44 172.31.22.135" # etcd 集群所有机器 IP
# etcd 集群间通信的IP和端口
export ETCD_NODES=infra0=https://172.31.22.208:2380,infra1=https://172.31.17.44:2380,infra2=https://172.31.22.135:2380

export NODE_NAME=infra1 # 当前部署的机器名称(随便定义，只要能区分不同机器即可)
export NODE_IP=172.31.17.44 # 当前部署的机器 IP
export NODE_IPS="172.31.22.208 172.31.17.44 172.31.22.135" # etcd 集群所有机器 IP
# etcd 集群间通信的IP和端口
export ETCD_NODES=infra0=https://172.31.22.208:2380,infra1=https://172.31.17.44:2380,infra2=https://172.31.22.135:2380

export NODE_NAME=infra2 # 当前部署的机器名称(随便定义，只要能区分不同机器即可)
export NODE_IP=172.31.22.135 # 当前部署的机器 IP
export NODE_IPS="172.31.22.208 172.31.17.44 172.31.22.135" # etcd 集群所有机器 IP
# etcd 集群间通信的IP和端口
export ETCD_NODES=infra0=https://172.31.22.208:2380,infra1=https://172.31.17.44:2380,infra2=https://172.31.22.135:2380

下载二进制文件

到 https://github.com/coreos/etcd/releases 页面下载最新版本的二进制文件：

wget https://github.com/coreos/etcd/releases/download/v3.2.24/etcd-v3.2.24-linux-amd64.tar.gz
tar -xvf etcd-v3.2.24-linux-amd64.tar.gz
mv etcd-v3.2.24-linux-amd64/etcd* /usr/bin

利用kubeadm创建秘钥和证书

为kubeadm创建配置文件

使用以下脚本为每个将在其上运行etcd成员的主机生成一个kubeadm配置文件。

# Update HOST0, HOST1, and HOST2 with the IPs or resolvable names of your hosts
export HOST0=172.31.22.208
export HOST1=172.31.17.44
export HOST2=172.31.22.135

# Create temp directories to store files that will end up on other hosts.
mkdir -p /tmp/${HOST0}/ /tmp/${HOST1}/ /tmp/${HOST2}/

ETCDHOSTS=(${HOST0} ${HOST1} ${HOST2})
NAMES=("infra0" "infra1" "infra2")

for i in "${!ETCDHOSTS[@]}"; do
HOST=${ETCDHOSTS[$i]}
NAME=${NAMES[$i]}
cat << EOF > /tmp/${HOST}/kubeadmcfg.yaml
apiVersion: "kubeadm.k8s.io/v1beta1"
kind: ClusterConfiguration
etcd:
    local:
        serverCertSANs:
        - "${HOST}"
        peerCertSANs:
        - "${HOST}"
        extraArgs:
            initial-cluster: infra0=https://${ETCDHOSTS[0]}:2380,infra1=https://${ETCDHOSTS[1]}:2380,infra2=https://${ETCDHOSTS[2]}:2380
            initial-cluster-state: new
            name: ${NAME}
            listen-peer-urls: https://${HOST}:2380
            listen-client-urls: https://${HOST}:2379
            advertise-client-urls: https://${HOST}:2379
            initial-advertise-peer-urls: https://${HOST}:2380
EOF
done

生成证书颁发机构

执行如下命令：

kubeadm init phase certs etcd-ca

生成下面两个文件：

/etc/kubernetes/pki/etcd/ca.crt
/etc/kubernetes/pki/etcd/ca.key

为每个成员创建证书

kubeadm init phase certs etcd-server --config=/tmp/${HOST2}/kubeadmcfg.yaml
kubeadm init phase certs etcd-peer --config=/tmp/${HOST2}/kubeadmcfg.yaml
kubeadm init phase certs etcd-healthcheck-client --config=/tmp/${HOST2}/kubeadmcfg.yaml
kubeadm init phase certs apiserver-etcd-client --config=/tmp/${HOST2}/kubeadmcfg.yaml
cp -R /etc/kubernetes/pki /tmp/${HOST2}/
# cleanup non-reusable certificates
find /etc/kubernetes/pki -not -name ca.crt -not -name ca.key -type f -delete

kubeadm init phase certs etcd-server --config=/tmp/${HOST1}/kubeadmcfg.yaml
kubeadm init phase certs etcd-peer --config=/tmp/${HOST1}/kubeadmcfg.yaml
kubeadm init phase certs etcd-healthcheck-client --config=/tmp/${HOST1}/kubeadmcfg.yaml
kubeadm init phase certs apiserver-etcd-client --config=/tmp/${HOST1}/kubeadmcfg.yaml
cp -R /etc/kubernetes/pki /tmp/${HOST1}/
find /etc/kubernetes/pki -not -name ca.crt -not -name ca.key -type f -delete

kubeadm init phase certs etcd-server --config=/tmp/${HOST0}/kubeadmcfg.yaml
kubeadm init phase certs etcd-peer --config=/tmp/${HOST0}/kubeadmcfg.yaml
kubeadm init phase certs etcd-healthcheck-client --config=/tmp/${HOST0}/kubeadmcfg.yaml
kubeadm init phase certs apiserver-etcd-client --config=/tmp/${HOST0}/kubeadmcfg.yaml
# No need to move the certs because they are for HOST0

# clean up certs that should not be copied off this host
find /tmp/${HOST2} -name ca.key -type f -delete
find /tmp/${HOST1} -name ca.key -type f -delete

拷贝证书到对应的主机上

USER=root
CONTROL_PLANE_IPS="172.31.17.44 172.31.22.135"
for host in ${CONTROL_PLANE_IPS}; do
    scp -r /tmp/${host}/pki "${USER}"@$host:
done

$ 例如HOST0上所需文件的完整列表是：

/etc/kubernetes/pki
├── apiserver-etcd-client.crt
├── apiserver-etcd-client.key
└── etcd
    ├── ca.crt
    ├── ca.key
    ├── healthcheck-client.crt
    ├── healthcheck-client.key
    ├── peer.crt
    ├── peer.key
    ├── server.crt
    └── server.key

其他两台主机如上。

创建 etcd 的 systemd unit 文件

mkdir -p /var/lib/etcd  # 必须先创建工作目录
cat > etcd.service <<EOF
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
Documentation=https://github.com/coreos

[Service]
Type=notify
WorkingDirectory=/var/lib/etcd/
ExecStart=/usr/bin/etcd \\
  --name=${NODE_NAME} \\
  --cert-file=/etc/kubernetes/pki/etcd/server.crt \\
  --key-file=/etc/kubernetes/pki/etcd/server.key \\
  --peer-cert-file=/etc/kubernetes/pki/etcd/peer.crt \\
  --peer-key-file=/etc/kubernetes/pki/etcd/peer.key \\
  --trusted-ca-file=/etc/kubernetes/pki/etcd/ca.crt \\
  --peer-trusted-ca-file=/etc/kubernetes/pki/etcd/ca.crt \\
  --initial-advertise-peer-urls=https://${NODE_IP}:2380 \\
  --listen-peer-urls=https://${NODE_IP}:2380 \\
  --listen-client-urls=https://${NODE_IP}:2379,http://127.0.0.1:2379 \\
  --advertise-client-urls=https://${NODE_IP}:2379 \\
  --initial-cluster-token=etcd-cluster-0 \\
  --initial-cluster=${ETCD_NODES} \\
  --initial-cluster-state=new \\
  --data-dir=/var/lib/etcd \\
  --auto-compaction-retention='1' \\
  --quota-backend-bytes='8589934592'
Restart=on-failure
RestartSec=5
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
EOF

指定 etcd 的工作目录和数据目录为 /var/lib/etcd，需在启动服务前创建这个目录；
为了保证通信安全，需要指定 etcd 的公私钥(cert-file和key-file)、Peers 通信的公私钥和 CA 证书(peer-cert-file、peer-key-file、peer-trusted-ca-file)、客户端的CA证书（trusted-ca-file）；
--initial-cluster-state 值为 new 时，--name 的参数值必须位于 --initial-cluster 列表中；

启动 etcd 服务

mv etcd.service /etc/systemd/system/
systemctl daemon-reload
systemctl enable etcd
systemctl start etcd
systemctl status etcd
$

最先启动的 etcd 进程会卡住一段时间，等待其它节点上的 etcd 进程加入集群，为正常现象。

在所有的 etcd 节点重复上面的步骤，直到所有机器的 etcd 服务都已启动。

验证服务

部署完 etcd 集群后，在任一 etcd 集群节点上执行如下命令：

for ip in ${NODE_IPS}; do
  ETCDCTL_API=3 /usr/bin/etcdctl \
  --endpoints=https://${ip}:2379  \
  --cacert=/etc/kubernetes/pki/etcd/ca.crt \
  --cert=/etc/kubernetes/pki/etcd/server.crt \
  --key=/etc/kubernetes/pki/etcd/server.key \
  endpoint health; 
  done

预期结果：

https://172.31.22.208:2379 is healthy: successfully committed proposal: took = 1.543275ms
https://172.31.17.44:2379 is healthy: successfully committed proposal: took = 1.883033ms
https://172.31.22.135:2379 is healthy: successfully committed proposal: took = 2.026367ms

三台 etcd 的输出均为 healthy 时表示集群服务正常（忽略 warning 信息）。

部署高可用 master集群

为kube-apiserver创建tcp负载均衡

这里选择aws的nlb。具体创建过程不再叙述。
创建结果nlb-sgt-k8sapiserver-test-4748f2f556591bb7.elb.us-west-2.amazonaws.com。

添加到变量

export LOAD_BALANCER_DNS=nlb-sgt-k8sapiserver-test-4748f2f556591bb7.elb.us-west-2.amazonaws.com
export ETCD_0_IP=172.31.22.208
export ETCD_1_IP=172.31.17.44
export ETCD_2_IP=172.31.22.135

创建启用aws cloud-provider

cat > kubeadm-config.yaml <<EOF
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
mode: "ipvs"
---
apiVersion: kubeadm.k8s.io/v1beta1
kind: ClusterConfiguration
kubernetesVersion: stable
controlPlaneEndpoint: "${LOAD_BALANCER_DNS}:6443"
apiServer:
  extraArgs:
    cloud-provider: aws
  certSANs:
  - "${LOAD_BALANCER_DNS}"
controllerManager:
  extraArgs:
    cloud-provider: aws
etcd:
    external:
        endpoints:
        - https://${ETCD_0_IP}:2379
        - https://${ETCD_1_IP}:2379
        - https://${ETCD_2_IP}:2379
        caFile: /etc/kubernetes/pki/etcd/ca.crt
        certFile: /etc/kubernetes/pki/apiserver-etcd-client.crt
        keyFile: /etc/kubernetes/pki/apiserver-etcd-client.key
networking:
  podSubnet: "192.168.0.0/16"
clusterName: "k8s-us-west-test-1"
EOF

创建不启用aws cloud-provider

cat > kubeadm-config.yaml <<EOF
apiVersion: kubeadm.k8s.io/v1beta1
kind: ClusterConfiguration
kubernetesVersion: stable
controlPlaneEndpoint: "${LOAD_BALANCER_DNS}:6443"
apiServer:
  certSANs:
  - "${LOAD_BALANCER_DNS}"
etcd:
    external:
        endpoints:
        - https://${ETCD_0_IP}:2379
        - https://${ETCD_1_IP}:2379
        - https://${ETCD_2_IP}:2379
        caFile: /etc/kubernetes/pki/etcd/ca.crt
        certFile: /etc/kubernetes/pki/apiserver-etcd-client.crt
        keyFile: /etc/kubernetes/pki/apiserver-etcd-client.key
networking:
  podSubnet: "192.168.0.0/16"
clusterName: "k8s-us-west-test-1"
EOF

创建第一个master

执行

kubeadm init --config=kubeadm-config.yaml

出现以下:

设置访问证书：

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

创建剩余master

复制证书

USER=root # customizable
CONTROL_PLANE_IPS="172.31.17.44 172.31.22.135"
for host in ${CONTROL_PLANE_IPS}; do
    scp /etc/kubernetes/pki/ca.crt "${USER}"@$host:
    scp /etc/kubernetes/pki/ca.key "${USER}"@$host:
    scp /etc/kubernetes/pki/sa.key "${USER}"@$host:
    scp /etc/kubernetes/pki/sa.pub "${USER}"@$host:
    scp /etc/kubernetes/pki/front-proxy-ca.crt "${USER}"@$host:
    scp /etc/kubernetes/pki/front-proxy-ca.key "${USER}"@$host:
    scp /etc/kubernetes/admin.conf "${USER}"@$host:
done

在剩余主机执行：

USER=root # customizable
mv /${USER}/ca.crt /etc/kubernetes/pki/
mv /${USER}/ca.key /etc/kubernetes/pki/
mv /${USER}/sa.pub /etc/kubernetes/pki/
mv /${USER}/sa.key /etc/kubernetes/pki/
mv /${USER}/front-proxy-ca.crt /etc/kubernetes/pki/
mv /${USER}/front-proxy-ca.key /etc/kubernetes/pki/
mv /${USER}/admin.conf /etc/kubernetes/admin.conf

加入控制节点：

kubeadm join nlb-sgt-k8sapiserver-test-4748f2f556591bb7.elb.us-west-2.amazonaws.com:6443 --token u9hmb3.gwfozvsz90k3yt9g --discovery-token-ca-cert-hash sha256:24c354cce46de9c1eb1a8358b9ba064166e87cf6c011fecaae3350c3910c215a  --experimental-control-plane

忘记discovery-token-ca-cert-hash？

openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null | openssl dgst -sha256 -hex | sed 's/^.* //'

部署calico网络

检查aws ec2

是否关闭了src/dst checks？

配置calicoctl

下载calicoctl

curl -O -L  https://github.com/projectcalico/calicoctl/releases/download/v3.4.0/calicoctl
chmod +x calicoctl
mv calicoctl /usr/bin/

配置calico config 文件

cat > /etc/calico/calicoctl.cfg <<EOF
apiVersion: projectcalico.org/v3
kind: CalicoAPIConfig
metadata:
spec:
  etcdEndpoints: https://${ETCD_0_IP}:2379,https://${ETCD_1_IP}:2379,https://${ETCD_2_IP}:2379
  etcdKeyFile: /etc/kubernetes/pki/etcd/server.key
  etcdCertFile: /etc/kubernetes/pki/etcd/server.crt
  etcdCACertFile: /etc/kubernetes/pki/etcd/ca.crt
EOF

使用到的变量

export ETCD_KEY=$(cat /etc/kubernetes/pki/etcd/server.key | base64 | tr -d '\n')
export ETCD_CERT=$(cat /etc/kubernetes/pki/etcd/server.crt | base64 | tr -d '\n')
export ETCD_CA=$(cat /etc/kubernetes/pki/etcd/ca.crt | base64 | tr -d '\n')

创建calico.yml

cat > calico.yml <<EOF
# Calico Version v3.4.0
# https://docs.projectcalico.org/v3.4/releases#v3.4.0
# This manifest includes the following component versions:
#   calico/node:v3.4.0
#   calico/cni:v3.4.0
#   calico/kube-controllers:v3.4.0

# This ConfigMap is used to configure a self-hosted Calico installation.
kind: ConfigMap
apiVersion: v1
metadata:
  name: calico-config
  namespace: kube-system
data:
  # Configure this with the location of your etcd cluster.
  etcd_endpoints: "https://${ETCD_0_IP}:2379,https://${ETCD_1_IP}:2379,https://${ETCD_2_IP}:2379"

  # If you're using TLS enabled etcd uncomment the following.
  # You must also populate the Secret below with these files.
  etcd_ca: "/calico-secrets/etcd-ca"
  etcd_cert: "/calico-secrets/etcd-cert"
  etcd_key: "/calico-secrets/etcd-key"
  # Configure the Calico backend to use.
  calico_backend: "bird"

  # Configure the MTU to use
  veth_mtu: "1440"

  # The CNI network configuration to install on each node.  The special
  # values in this config will be automatically populated.
  cni_network_config: |-
    {
      "name": "k8s-pod-network",
      "cniVersion": "0.3.0",
      "plugins": [
        {
          "type": "calico",
          "log_level": "info",
          "etcd_endpoints": "__ETCD_ENDPOINTS__",
          "etcd_key_file": "__ETCD_KEY_FILE__",
          "etcd_cert_file": "__ETCD_CERT_FILE__",
          "etcd_ca_cert_file": "__ETCD_CA_CERT_FILE__",
          "mtu": __CNI_MTU__,
          "ipam": {
              "type": "calico-ipam"
          },
          "policy": {
              "type": "k8s"
          },
          "kubernetes": {
              "kubeconfig": "__KUBECONFIG_FILEPATH__"
          }
        },
        {
          "type": "portmap",
          "snat": true,
          "capabilities": {"portMappings": true}
        }
      ]
    }

---

# The following contains k8s Secrets for use with a TLS enabled etcd cluster.
# For information on populating Secrets, see http://kubernetes.io/docs/user-guide/secrets/
apiVersion: v1
kind: Secret
type: Opaque
metadata:
  name: calico-etcd-secrets
  namespace: kube-system
data:
  # Populate the following with etcd TLS configuration if desired, but leave blank if
  # not using TLS for etcd.
  # The keys below should be uncommented and the values populated with the base64
  # encoded contents of each file that would be associated with the TLS data.
  # Example command for encoding a file contents: cat <file> | base64 -w 0
  etcd-key: ${ETCD_KEY}
  etcd-cert: ${ETCD_CERT}
  etcd-ca: ${ETCD_CA}

---
# This manifest installs the calico/node container, as well
# as the Calico CNI plugins and network config on
# each master and worker node in a Kubernetes cluster.
kind: DaemonSet
apiVersion: extensions/v1beta1
metadata:
  name: calico-node
  namespace: kube-system
  labels:
    k8s-app: calico-node
spec:
  selector:
    matchLabels:
      k8s-app: calico-node
  updateStrategy:
    type: RollingUpdate
    rollingUpdate:
      maxUnavailable: 1
  template:
    metadata:
      labels:
        k8s-app: calico-node
      annotations:
        # This, along with the CriticalAddonsOnly toleration below,
        # marks the pod as a critical add-on, ensuring it gets
        # priority scheduling and that its resources are reserved
        # if it ever gets evicted.
        scheduler.alpha.kubernetes.io/critical-pod: ''
    spec:
      nodeSelector:
        beta.kubernetes.io/os: linux
      hostNetwork: true
      tolerations:
        # Make sure calico-node gets scheduled on all nodes.
        - effect: NoSchedule
          operator: Exists
        # Mark the pod as a critical add-on for rescheduling.
        - key: CriticalAddonsOnly
          operator: Exists
        - effect: NoExecute
          operator: Exists
      serviceAccountName: calico-node
      # Minimize downtime during a rolling upgrade or deletion; tell Kubernetes to do a "force
      # deletion": https://kubernetes.io/docs/concepts/workloads/pods/pod/#termination-of-pods.
      terminationGracePeriodSeconds: 0
      initContainers:
        # This container installs the Calico CNI binaries
        # and CNI network config file on each node.
        - name: install-cni
          image: quay.io/calico/cni:v3.4.0
          command: ["/install-cni.sh"]
          env:
            # Name of the CNI config file to create.
            - name: CNI_CONF_NAME
              value: "10-calico.conflist"
            # The CNI network config to install on each node.
            - name: CNI_NETWORK_CONFIG
              valueFrom:
                configMapKeyRef:
                  name: calico-config
                  key: cni_network_config
            # The location of the Calico etcd cluster.
            - name: ETCD_ENDPOINTS
              valueFrom:
                configMapKeyRef:
                  name: calico-config
                  key: etcd_endpoints
            # CNI MTU Config variable
            - name: CNI_MTU
              valueFrom:
                configMapKeyRef:
                  name: calico-config
                  key: veth_mtu
            # Prevents the container from sleeping forever.
            - name: SLEEP
              value: "false"
          volumeMounts:
            - mountPath: /host/opt/cni/bin
              name: cni-bin-dir
            - mountPath: /host/etc/cni/net.d
              name: cni-net-dir
            - mountPath: /calico-secrets
              name: etcd-certs
      containers:
        # Runs calico/node container on each Kubernetes node.  This
        # container programs network policy and routes on each
        # host.
        - name: calico-node
          image: quay.io/calico/node:v3.4.0
          env:
            # The location of the Calico etcd cluster.
            - name: ETCD_ENDPOINTS
              valueFrom:
                configMapKeyRef:
                  name: calico-config
                  key: etcd_endpoints
            # Location of the CA certificate for etcd.
            - name: ETCD_CA_CERT_FILE
              valueFrom:
                configMapKeyRef:
                  name: calico-config
                  key: etcd_ca
            # Location of the client key for etcd.
            - name: ETCD_KEY_FILE
              valueFrom:
                configMapKeyRef:
                  name: calico-config
                  key: etcd_key
            # Location of the client certificate for etcd.
            - name: ETCD_CERT_FILE
              valueFrom:
                configMapKeyRef:
                  name: calico-config
                  key: etcd_cert
            # Set noderef for node controller.
            - name: CALICO_K8S_NODE_REF
              valueFrom:
                fieldRef:
                  fieldPath: spec.nodeName
            # Choose the backend to use.
            - name: CALICO_NETWORKING_BACKEND
              valueFrom:
                configMapKeyRef:
                  name: calico-config
                  key: calico_backend
            # Cluster type to identify the deployment type
            - name: CLUSTER_TYPE
              value: "k8s,bgp"
            # Auto-detect the BGP IP address.
            - name: IP
              value: "autodetect"
            # Enable IPIP
            - name: CALICO_IPV4POOL_IPIP
              value: "Always"
            # Set MTU for tunnel device used if ipip is enabled
            - name: FELIX_IPINIPMTU
              valueFrom:
                configMapKeyRef:
                  name: calico-config
                  key: veth_mtu
            # The default IPv4 pool to create on startup if none exists. Pod IPs will be
            # chosen from this range. Changing this value after installation will have
            # no effect. This should fall within --cluster-cidr.
            - name: CALICO_IPV4POOL_CIDR
              value: "192.168.0.0/16"
            # Disable file logging so `kubectl logs` works.
            - name: CALICO_DISABLE_FILE_LOGGING
              value: "true"
            # Set Felix endpoint to host default action to ACCEPT.
            - name: FELIX_DEFAULTENDPOINTTOHOSTACTION
              value: "ACCEPT"
            # Disable IPv6 on Kubernetes.
            - name: FELIX_IPV6SUPPORT
              value: "false"
            # Set Felix logging to "info"
            - name: FELIX_LOGSEVERITYSCREEN
              value: "info"
            - name: FELIX_HEALTHENABLED
              value: "true"
          securityContext:
            privileged: true
          resources:
            requests:
              cpu: 250m
          livenessProbe:
            httpGet:
              path: /liveness
              port: 9099
              host: localhost
            periodSeconds: 10
            initialDelaySeconds: 10
            failureThreshold: 6
          readinessProbe:
            exec:
              command:
              - /bin/calico-node
              - -bird-ready
              - -felix-ready
            periodSeconds: 10
          volumeMounts:
            - mountPath: /lib/modules
              name: lib-modules
              readOnly: true
            - mountPath: /run/xtables.lock
              name: xtables-lock
              readOnly: false
            - mountPath: /var/run/calico
              name: var-run-calico
              readOnly: false
            - mountPath: /var/lib/calico
              name: var-lib-calico
              readOnly: false
            - mountPath: /calico-secrets
              name: etcd-certs
      volumes:
        # Used by calico/node.
        - name: lib-modules
          hostPath:
            path: /lib/modules
        - name: var-run-calico
          hostPath:
            path: /var/run/calico
        - name: var-lib-calico
          hostPath:
            path: /var/lib/calico
        - name: xtables-lock
          hostPath:
            path: /run/xtables.lock
            type: FileOrCreate
        # Used to install CNI.
        - name: cni-bin-dir
          hostPath:
            path: /opt/cni/bin
        - name: cni-net-dir
          hostPath:
            path: /etc/cni/net.d
        # Mount in the etcd TLS secrets with mode 400.
        # See https://kubernetes.io/docs/concepts/configuration/secret/
        - name: etcd-certs
          secret:
            secretName: calico-etcd-secrets
            defaultMode: 0400
---

apiVersion: v1
kind: ServiceAccount
metadata:
  name: calico-node
  namespace: kube-system

---
# This manifest deploys the Calico Kubernetes controllers.
# See https://github.com/projectcalico/kube-controllers
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: calico-kube-controllers
  namespace: kube-system
  labels:
    k8s-app: calico-kube-controllers
  annotations:
    scheduler.alpha.kubernetes.io/critical-pod: ''
spec:
  # The controllers can only have a single active instance.
  replicas: 1
  strategy:
    type: Recreate
  template:
    metadata:
      name: calico-kube-controllers
      namespace: kube-system
      labels:
        k8s-app: calico-kube-controllers
    spec:
      nodeSelector:
        beta.kubernetes.io/os: linux
      # The controllers must run in the host network namespace so that
      # it isn't governed by policy that would prevent it from working.
      hostNetwork: true
      tolerations:
        # Mark the pod as a critical add-on for rescheduling.
        - key: CriticalAddonsOnly
          operator: Exists
        - key: node-role.kubernetes.io/master
          effect: NoSchedule
      serviceAccountName: calico-kube-controllers
      containers:
        - name: calico-kube-controllers
          image: quay.io/calico/kube-controllers:v3.4.0
          env:
            # The location of the Calico etcd cluster.
            - name: ETCD_ENDPOINTS
              valueFrom:
                configMapKeyRef:
                  name: calico-config
                  key: etcd_endpoints
            # Location of the CA certificate for etcd.
            - name: ETCD_CA_CERT_FILE
              valueFrom:
                configMapKeyRef:
                  name: calico-config
                  key: etcd_ca
            # Location of the client key for etcd.
            - name: ETCD_KEY_FILE
              valueFrom:
                configMapKeyRef:
                  name: calico-config
                  key: etcd_key
            # Location of the client certificate for etcd.
            - name: ETCD_CERT_FILE
              valueFrom:
                configMapKeyRef:
                  name: calico-config
                  key: etcd_cert
            # Choose which controllers to run.
            - name: ENABLED_CONTROLLERS
              value: policy,namespace,serviceaccount,workloadendpoint,node
          volumeMounts:
            # Mount in the etcd TLS secrets.
            - mountPath: /calico-secrets
              name: etcd-certs
          readinessProbe:
            exec:
              command:
              - /usr/bin/check-status
              - -r
      volumes:
        # Mount in the etcd TLS secrets with mode 400.
        # See https://kubernetes.io/docs/concepts/configuration/secret/
        - name: etcd-certs
          secret:
            secretName: calico-etcd-secrets
            defaultMode: 0400

---

apiVersion: v1
kind: ServiceAccount
metadata:
  name: calico-kube-controllers
  namespace: kube-system
---

# Include a clusterrole for the kube-controllers component,
# and bind it to the calico-kube-controllers serviceaccount.
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: calico-kube-controllers
rules:
  # Pods are monitored for changing labels.
  # The node controller monitors Kubernetes nodes.
  # Namespace and serviceaccount labels are used for policy.
  - apiGroups:
      - ""
    resources:
      - pods
      - nodes
      - namespaces
      - serviceaccounts
    verbs:
      - watch
      - list
  # Watch for changes to Kubernetes NetworkPolicies.
  - apiGroups:
      - networking.k8s.io
    resources:
      - networkpolicies
    verbs:
      - watch
      - list
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: calico-kube-controllers
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: calico-kube-controllers
subjects:
- kind: ServiceAccount
  name: calico-kube-controllers
  namespace: kube-system
---
# Include a clusterrole for the calico-node DaemonSet,
# and bind it to the calico-node serviceaccount.
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: calico-node
rules:
  # The CNI plugin needs to get pods, nodes, and namespaces.
  - apiGroups: [""]
    resources:
      - pods
      - nodes
      - namespaces
    verbs:
      - get
  - apiGroups: [""]
    resources:
      - endpoints
      - services
    verbs:
      # Used to discover service IPs for advertisement.
      - watch
      - list
  - apiGroups: [""]
    resources:
      - nodes/status
    verbs:
      # Needed for clearing NodeNetworkUnavailable flag.
      - patch
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  name: calico-node
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: calico-node
subjects:
- kind: ServiceAccount
  name: calico-node
  namespace: kube-system
---

EOF

部署calico

kubectl apply -f calico.yml

设置ippool

执行：

calicoctl apply -f - << EOF
apiVersion: projectcalico.org/v3
kind: IPPool
metadata:
  name: default-ipv4-ippool
spec:
  cidr: 192.168.0.0/16
  ipipMode: CrossSubnet
  natOutgoing: true
EOF

部署node节点

执行主机设置的所有项。

执行加入操作：

kubeadm join nlb-sgt-k8sapiserver-test-4748f2f556591bb7.elb.us-west-2.amazonaws.com:6443 --token u9hmb3.gwfozvsz90k3yt9g --discovery-token-ca-cert-hash sha256:24c354cce46de9c1eb1a8358b9ba064166e87cf6c011fecaae3350c3910c215a

验证：

 kubectl get nodes
NAME                                          STATUS   ROLES    AGE     VERSION
ip-172-31-17-44.us-west-2.compute.internal    Ready    master   4m2s    v1.13.0
ip-172-31-22-135.us-west-2.compute.internal   Ready    master   3m59s   v1.13.0
ip-172-31-22-208.us-west-2.compute.internal   Ready    master   16h     v1.13.0
ip-172-31-29-58.us-west-2.compute.internal    Ready    <none>   14h     v1.13.0

部署addon

部署aws的sts

kubectl apply -f https://raw.githubusercontent.com/kubernetes/kubernetes/master/cluster/addons/storage-class/aws/default.yaml

创建alb-ingress-controller

为subnet打标签

标记AWS子网以允许入口控制器自动发现用于ALB的子网。

kubernetes.io/cluster/${cluster-name} must be set to owned or shared
kubernetes.io/role/internal-elb must be set to 1 or `` for internal LoadBalancers
kubernetes.io/role/elb must be set to 1 or `` for internet-facing LoadBalancers

rbac

kubectl apply -f https://raw.githubusercontent.com/kubernetes-sigs/aws-alb-ingress-controller/v1.0.1/docs/examples/rbac-role.yaml

按照如下yaml创建

# Application Load Balancer (ALB) Ingress Controller Deployment Manifest.
# This manifest details sensible defaults for deploying an ALB Ingress Controller.
# GitHub: https://github.com/kubernetes-sigs/aws-alb-ingress-controller
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: alb-ingress-controller
  name: alb-ingress-controller
  # Namespace the ALB Ingress Controller should run in. Does not impact which
  # namespaces it's able to resolve ingress resource for. For limiting ingress
  # namespace scope, see --watch-namespace.
  namespace: kube-system
  annotations:
    scheduler.alpha.kubernetes.io/critical-pod: ''
spec:
  replicas: 1
  selector:
    matchLabels:
      app: alb-ingress-controller
  strategy:
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 1
    type: RollingUpdate
  template:
    metadata:
      annotations:
        iam.amazonaws.com/role: arn:aws:iam::1234567:role/Role-KubernetesIngressController-test
      labels:
        app: alb-ingress-controller
    spec:
      containers:
        - args:
            # Limit the namespace where this ALB Ingress Controller deployment will
            # resolve ingress resources. If left commented, all namespaces are used.
            # - --watch-namespace=your-k8s-namespace

            # Setting the ingress-class flag below ensures that only ingress resources with the
            # annotation kubernetes.io/ingress.class: "alb" are respected by the controller. You may
            # choose any class you'd like for this controller to respect.
            - --ingress-class=alb

            # Name of your cluster. Used when naming resources created
            # by the ALB Ingress Controller, providing distinction between
            # clusters.
            - --cluster-name=k8s-us-west-test-1

            # AWS VPC ID this ingress controller will use to create AWS resources.
            # If unspecified, it will be discovered from ec2metadata.
            # - --aws-vpc-id=vpc-xxxxxx

            # AWS region this ingress controller will operate in.
            # If unspecified, it will be discovered from ec2metadata.
            # List of regions: http://docs.aws.amazon.com/general/latest/gr/rande.html#vpc_region
            # - --aws-region=us-west-1

            # Enables logging on all outbound requests sent to the AWS API.
            # If logging is desired, set to true.
            # - ---aws-api-debug
            # Maximum number of times to retry the aws calls.
            # defaults to 10.
            # - --aws-max-retries=10
          env:
            # AWS key id for authenticating with the AWS API.
            # This is only here for examples. It's recommended you instead use
            # a project like kube2iam for granting access.
            #- name: AWS_ACCESS_KEY_ID
            #  value: KEYVALUE

            # AWS key secret for authenticating with the AWS API.
            # This is only here for examples. It's recommended you instead use
            # a project like kube2iam for granting access.
            #- name: AWS_SECRET_ACCESS_KEY
            #  value: SECRETVALUE
          # Repository location of the ALB Ingress Controller.
          image: 894847497797.dkr.ecr.us-west-2.amazonaws.com/aws-alb-ingress-controller:v1.0.1
          imagePullPolicy: Always
          name: server
          resources: {}
          terminationMessagePath: /dev/termination-log
      dnsPolicy: ClusterFirst
      restartPolicy: Always
      securityContext: {}
      terminationGracePeriodSeconds: 30
      serviceAccountName: alb-ingress
      serviceAccount: alb-ingress

注意cluster-name 指定集群name。

创建dashbord

kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml

需要创建一个admin用户并授予admin角色绑定，使用下面的yaml文件创建admin用户并赋予他管理员权限，然后可以通过token登陆dashbaord，该文件见admin-role.yaml

kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: admin
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
roleRef:
  kind: ClusterRole
  name: cluster-admin
  apiGroup: rbac.authorization.k8s.io
subjects:
- kind: ServiceAccount
  name: admin
  namespace: kube-system
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: admin
  namespace: kube-system
  labels:
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile

获取token

kubectl -n kube-system get secret|grep admin-token
admin-token-cs4gs                                kubernetes.io/service-account-token   3      10m

kubectl describe secret admin-token-cs4gs -n kube-system

重新部署操作

kubeadm reset

iptables -F && iptables -t nat -F && iptables -t mangle -F && iptables -X

ipvsadm --clear

ifconfig tunl0 down

ip link delete tunl0

升级kubeadm等

升级kubeadm

export VERSION=$(curl -sSL https://dl.k8s.io/release/stable.txt) # or manually specify a released Kubernetes version
export ARCH=amd64 # or: arm, arm64, ppc64le, s390x
curl -sSL https://dl.k8s.io/release/${VERSION}/bin/linux/${ARCH}/kubeadm > /usr/bin/kubeadm
chmod a+rx /usr/bin/kubeadm

升级kubectl

export VERSION=$(curl -sSL https://dl.k8s.io/release/stable.txt) # or manually specify a released Kubernetes version
export ARCH=amd64 # or: arm, arm64, ppc64le, s390x
curl -sSL https://dl.k8s.io/release/${VERSION}/bin/linux/${ARCH}/kubectl > /usr/bin/kubectl
chmod a+rx /usr/bin/kubectl

升级kubelet

export VERSION=$(curl -sSL https://dl.k8s.io/release/stable.txt) # or manually specify a released Kubernetes version
export ARCH=amd64 # or: arm, arm64, ppc64le, s390x
curl -sSL https://dl.k8s.io/release/${VERSION}/bin/linux/${ARCH}/kubelet > /usr/bin/kubelet
chmod a+rx /usr/bin/kubelet