在公司，使用dns切换，可能会比keepalived+haproxy，更精简的易维护。

毕竟，高可用只是偶尔切换，不是时时切换。

且dns解析在自己可控时，更不会影响k8s线上使用了。

(部分代码，由于担心太冗长，已使用xxx代替，这些xxx完全可以自己生成的)

使用步骤如下：

先在每个master上安装etcd，运行如下命令：

sh k8s.sh k8s.xxx.com.cn etcd

等每个master上的etcd安装好之后，运行如下命令：

sh k8s.sh k8s.xxx.com.cn master

最后，在每个node节点上，运行如下命令：

sh k8s.sh k8s.xxx.com.cn node
#! /usr/bin/env bash

set -e
set -u
set -x
#使用系统的PATH环境
export PATH=$(echo $PATH)

#接收及判断参数合法性
#sh k8s.sh k8s.xxx.com.cn etcd
#sh k8s.sh k8s.xxx.com.cn master
#sh k8s.sh k8s.xxx.com.cn node
K8S_DOMAIN=$1
OP_STEP=$2

#判断参数
if [ $# -ne 2 ]; then
  echo "wrong args."
  echo "usage `basename $0` [K8S_DOMAIN] [init|cert|etcd|master|node]"
  exit 110
fi

#每一个新集群，此处必须修改
#指定使用集群ip的网络端口，THIS_HOST必是HOST_1，HOST_2，HOST_3中的一个
ETH=eth0
HOST_1=1.2.3.4
HOST_2=1.2.3.5
HOST_3=1.2.3.6
THIS_HOST=$(ip addr show ${ETH} |grep inet|grep -v inet6|awk '{print $2}'|awk -F '/' '{print $1}')
LOCAL_HOST=$(hostname)
LOCAL_HOST_L=${LOCAL_HOST,,}

#定义常量，如有必要，可有更多常量加入
#安装k8s版本
K8S_VER=v1.12.6
#用于判断是否安装了kubelet等软件
KUBE_VER=${K8S_VER/v/}
#apiserver端口
K8S_API_PORT=6443
#k8s加入的token
K8S_JOIN_TOKEN=xxxxxx.xxxxxxxxxabcdef
#可以操作kubectl的普通用户
General_user=k8s
#生成cert证书的cfssl软件目录
cs="./cfssl"
csj="./cfssljson"
#cert证书在k8s中的安装目录
pki_dir="/etc/kubernetes/pki"
#所有docker的来源仓库，不再需要外网
REGISTRY=harbor.demo.cn/3rd_part/k8s.gcr.io
#etcd集群版本(最好和k8s要求的版本一致3.2.24)
ETCD_VERSION=3.2.18
#etcd服务端口及其它集群状态(peer之间，未用https)
ETCD_CLI_PORT=2379
ETCD_CLU_PORT=2380
TOKEN=pa-k8s-etcd-token
CLUSTER_STATE=new
CLUSTER=${HOST_1}=http://${HOST_1}:${ETCD_CLU_PORT},${HOST_2}=http://${HOST_2}:${ETCD_CLU_PORT},${HOST_3}=http://${HOST_3}:${ETCD_CLU_PORT}
etcd_data_dir=/etcd/etcd-data
#定义当前目录
CUR_DIR=$(cd $(dirname $0); pwd)

#判断eth0 IP是否在集群内
function ip_in_cluster() {
	if [[ ${THIS_HOST} != ${HOST_1} && ${THIS_HOST} != ${HOST_2} && ${THIS_HOST} != ${HOST_3} ]]; then
	  echo "ip not in the etcd cluster host."
	  exit 110
	fi
}

#每次全新生成文件
function if_file_exist_del() {
	if [ -e $1 ]; then
        rm -f $1
  fi

}

#重置iptables
function iptables_clear() {

    iptables -P INPUT ACCEPT
    iptables -P FORWARD ACCEPT
    iptables -P OUTPUT ACCEPT
    iptables -t nat -P PREROUTING ACCEPT
    iptables -t nat -P POSTROUTING ACCEPT
    iptables -t nat -P OUTPUT ACCEPT
    iptables -t mangle -P PREROUTING ACCEPT
    iptables -t mangle -P OUTPUT ACCEPT
    iptables -F
    iptables -t nat -F
    iptables -t mangle -F
    iptables -X
    iptables -t nat -X
    iptables -t mangle -X
}

#服务器初化，尽量标准化
function system_init() {
    #停止firewall防火墙，并禁止开机自启动
    systemctl stop firewalld.service
    systemctl disable firewalld.service

		#重置iptables
    iptables_clear

    #禁止selinux
    sed -i "s/^SELINUX=enforcing/SELINUX=disabled/g" /etc/sysconfig/selinux
		sed -i "s/^SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config
		sed -i "s/^SELINUX=permissive/SELINUX=disabled/g" /etc/sysconfig/selinux
		sed -i "s/^SELINUX=permissive/SELINUX=disabled/g" /etc/selinux/config
    set +e
    setenforce 0
    set -e

    #关闭swap交换内存，K8S强制的，不然安装会报错
    swapoff -a
    sed -i 's/.*swap.*/#&/' /etc/fstab

    #配置k8s内核参数
    k8s_kernel_conf=/etc/sysctl.d/k8s.conf
    if_file_exist_del $k8s_kernel_conf
    cat<<EOF>$k8s_kernel_conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
fs.may_detach_mounts = 1
vm.overcommit_memory=1
vm.panic_on_oom=0
fs.inotify.max_user_watches=89100
fs.file-max=52706963
fs.nr_open=52706963
net.netfilter.nf_conntrack_max=2310720
vm.swappiness=0
EOF

    #使配置生效
    sysctl -p
    sysctl --system

    # 安装工具及加载br_netfilter, ipvs
    yum install bridge-utils ipset ipvsadm sysstat libseccomp conntrack  conntrack-tools socat -y

    modprobe br_netfilter
    modprobe -- ip_vs
    modprobe -- ipip
    modprobe -- tun
    modprobe -- ip_vs_rr
    modprobe -- ip_vs_wrr
    modprobe -- ip_vs_sh
    modprobe -- nf_conntrack_ipv4
    modprobe -- nf_conntrack_ipv6

    ipvs_no=$(cat /etc/rc.local|grep ip_vs|wc -l)
    if [ $ipvs_no -eq 0 ]; then
        echo "modprobe br_netfilter" >> /etc/rc.local
        echo "modprobe -- ip_vs" >> /etc/rc.local
        echo "modprobe -- ipip" >> /etc/rc.local
        echo "modprobe -- tun" >> /etc/rc.local
        echo "modprobe -- ip_vs_rr" >> /etc/rc.local
        echo "modprobe -- ip_vs_wrr" >> /etc/rc.local
        echo "modprobe -- ip_vs_sh" >> /etc/rc.local
        echo "modprobe -- nf_conntrack_ipv4" >> /etc/rc.local
        echo "modprobe -- nf_conntrack_ipv6" >> /etc/rc.local
    fi

    # 为etcd数据和k8s证书生成目录
		mkdir -p ${pki_dir} &&	mkdir -p ${etcd_data_dir}
		rm -rf ${pki_dir}/* &&	mkdir -p ${etcd_data_dir}/*
		chown -R docker.docker ${pki_dir} ${etcd_data_dir}
		chmod -R 755 ${pki_dir} ${etcd_data_dir}

    #安装必须软件，将其cp到指定运行目录

    kube_version=$(rpm -qa|grep kubelet)
    kube_version=${kube_version:=None}
    if [[ ${kube_version} =~ ${KUBE_VER} ]]; then
    	kubeadm reset -f
    else
    	set +e
    	yum remove kubeadm -y
      yum remove kubectl -y
      yum remove kubelet -y
      set -e
		  yum localinstall *.rpm -y
		  tar xf cni-plugins-amd64-v0.7.5.tgz -C /opt/cni/bin
    	/bin/cp /usr/bin/kube* /usr/local/bin/
		fi

    #配置docker用户可以命令行的相关命令
    k8s_sudoers_conf=/etc/sudoers.d/k8s_sudoers
    if_file_exist_del $k8s_sudoers_conf
    cat<<EOF>$k8s_sudoers_conf
docker ALL = (root) NOPASSWD:/bin/systemctl restart docker
docker ALL = (root) NOPASSWD:/bin/systemctl reload docker
docker ALL = (root) NOPASSWD:/bin/systemctl daemon-reload
docker ALL = (root) NOPASSWD:/bin/systemctl start kubelet
docker ALL = (root) NOPASSWD:/bin/systemctl stop kubelet'
docker ALL = (root) NOPASSWD:/bin/systemctl restart kubelet'
docker ALL = (root) NOPASSWD:/bin/systemctl status kubelet'
docker ALL = (root) NOPASSWD:/usr/local/bin/kubeadm'
docker ALL = (root) NOPASSWD:/usr/local/bin/kubectl'
EOF

	#如果以前安装过k8s，清除相关的虚拟网络接口
	ifconfig -a|grep  -vE '(^[[:space:]]|^$)'|grep -E '(veth|flannel|kube|cni|dummy)'|awk -F ":" '{print $1}'|awk '{for(i=1;i<=NF;i++){print "ip link set " $i " down";}}'|sh
	ifconfig -a|grep  -vE '(^[[:space:]]|^$)'|grep -E '(veth|flannel|kube|cni|dummy)'|awk -F ":" '{print $1}'|awk '{for(i=1;i<=NF;i++){print "ip link delete " $i;}}'|sh
	modprobe -r ipip
	modprobe -r ip_gre
	modprobe  ipip
	modprobe  ip_gre

	#自定义pause的image仓库，摆脱对外上网的依赖
	kubelet_sysconfig=/etc/sysconfig/kubelet
	if_file_exist_del $kubelet_sysconfig
	cat >$kubelet_sysconfig<<EOF
KUBELET_EXTRA_ARGS="--pod-infra-container-image=harbor.paic.com.cn/3rd_part/k8s.gcr.io/pause:3.1"
EOF

		# 启动
		systemctl daemon-reload
		systemctl enable kubelet && systemctl restart kubelet
		echo "================================="
		echo "k8s init system success"

}

#将相应的文件写入shell，摆脱对太多yaml文件或key文件的依赖
function saPub() {
    cat<<EOF>saen.pub
xxx
EOF
}

function saKey() {
    cat<<EOF>saen.key
xxx
EOF
}

function caCrt() {
    cat<<EOF>caen.crt
xxx
EOF
}

function caKey() {
    cat<<EOF>caen.key
xxx
EOF
}

function frontProxyCrt() {
    cat<<EOF>front-proxy-ca.crt
xxx
-----END CERTIFICATE-----
EOF
}

function frontProxyKey() {
    cat<<EOF>front-proxy-ca.key
xxx
EOF
}

function caCsr() {
    cat<<EOF>ca-csr.json
{
  "CN": "kubernetes",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "ca": {
    "expiry": "438000h"
  }
}
EOF
}

function caConfig() {
    cat<<EOF>ca-config.json
{
    "signing": {
        "default": {
            "expiry": "438000h"
        },
        "profiles": {
            "server": {
                "expiry": "438000h",
                "usages": [
                    "signing",
                    "key encipherment",
                    "server auth"
                ]
            },
            "client": {
                "expiry": "438000h",
                "usages": [
                    "signing",
                    "key encipherment",
                    "client auth"
                ]
            },
            "peer": {
                "expiry": "438000h",
                "usages": [
                    "signing",
                    "key encipherment",
                    "server auth",
                    "client auth"
                ]
            }
        }
    }
}
EOF
}

function etcdServer() {
    cat<<EOF>etcd-server.json
{
    "CN": "etcdServer",
    "hosts": [
        "127.0.0.1",
        "localhost",
        "${LOCAL_HOST_L}",
        "${K8S_DOMAIN}",
        "${HOST_1}",
        "${HOST_2}",
        "${HOST_3}"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "O": "etcd",
            "OU": "etcd Security",
            "C": "CN",
            "L": "ShangHai",
            "ST": "ShangHai"
        }
    ]
}
EOF
}

function etcdPeer() {
    cat<<EOF>etcd-peer.json
{
    "CN": "etcdPeer",
    "hosts": [
    "127.0.0.1",
    "localhost",
    "${LOCAL_HOST_L}",
    "${K8S_DOMAIN}",
    "${HOST_1}",
    "${HOST_2}",
    "${HOST_3}"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
        "O": "etcd",
        "OU": "etcd Security",
            "C": "CN",
            "L": "ShangHai",
            "ST": "ShangHai"
        }
    ]
}
EOF
}

function etcdClient() {
    cat<<EOF>etcd-client.json
{
    "CN": "etcdClient",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
        "O": "etcd",
        "OU": "etcd Security",
            "C": "CN",
            "L": "ShangHai",
            "ST": "ShangHai"
        }
    ]
}
EOF
}

function frontProxyClient() {
    cat<<EOF>front-proxy-client.json
{
    "CN": "front-proxy-client",
    "key": {
        "algo": "rsa",
        "size": 2048
    }
}
EOF
}

function apiServer() {
    cat<<EOF>apiserver.json
{
    "CN": "kube-apiserver",
    "hosts": [
    	"kubernetes",
    	"kubernetes.default",
    	"kubernetes.default.svc",
    	"kubernetes.default.svc.cluster.local",
    	"10.96.0.1",
    	"${LOCAL_HOST_L}",
      "${K8S_DOMAIN}",
      "${HOST_1}",
      "${HOST_2}",
      "${HOST_3}"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    }
}
EOF
}

function apiKubClient() {
    cat<<EOF>apiserver-kubelet-client.json
{
    "CN": "kube-apiserver-kubelet-client",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
		{
	    "O": "system:masters"
		}
    ]
}
EOF
}

#########################################
#########################################
#生成kubeadm安装文件
kubeadm_conf=kubeadm-config.yaml
if_file_exist_del $kubeadm_conf
cat << EOF >$kubeadm_conf
apiVersion: kubeadm.k8s.io/v1alpha3
kind: InitConfiguration
apiEndpoint:
  advertiseAddress: ${THIS_HOST}
  bindPort: ${K8S_API_PORT}
bootstrapTokens:
- groups:
  - system:bootstrappers:kubeadm:default-node-token
  token: ${K8S_JOIN_TOKEN}
  ttl: 0s
  usages:
  - signing
  - authentication
---
apiVersion: kubeadm.k8s.io/v1alpha3
kind: ClusterConfiguration
etcd:
  external:
    endpoints:
    - https://${HOST_1}:${ETCD_CLI_PORT}
    - https://${HOST_2}:${ETCD_CLI_PORT}
    - https://${HOST_3}:${ETCD_CLI_PORT}
    caFile: ${pki_dir}/etcd/ca.crt
    certFile: ${pki_dir}/apiserver-etcd-client.crt
    keyFile: ${pki_dir}/apiserver-etcd-client.key
imageRepository: ${REGISTRY}
kubernetesVersion: ${K8S_VER}
#controlPlaneEndpoint: ${K8S_DOMAIN}:${K8S_API_PORT}
networking:
  podSubnet: 10.244.0.0/16
  serviceSubnet: 10.96.0.0/12
---
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
mode: "ipvs"
EOF

#生成node节点自动续期证书
auto_cet_server=node-auto-cert-server.yaml
if_file_exist_del $auto_cet_server
  cat << EOF >$auto_cet_server
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
  labels:
    kubernetes.io/bootstrapping: rbac-defaults
  name: system:certificates.k8s.io:certificatesigningrequests:selfnodeserver
rules:
- apiGroups:
  - certificates.k8s.io
  resources:
  - certificatesigningrequests/selfnodeserver
  verbs:
  - create
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: kubeadm:node-autoapprove-certificate-server
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:certificates.k8s.io:certificatesigningrequests:selfnodeserver
subjects:
- apiGroup: rbac.authorization.k8s.io
  kind: Group
  name: system:nodes
EOF

#生成flannel 网络插件
flannel=flannel.yaml
if_file_exist_del $flannel
#将相应的文件写入shell，摆脱对太多yaml文件或key文件的依赖
cat << EOF >$flannel
xxx
EOF

#初始化证书，记得延长证书过期时间，及api的ca一定不能和front proxy的ca相同。
function cert_init() {
    # caCsr
    set +x
    rm *.csr&&rm *.json&&rm *.crt&&rm *.key&&rm *.pem&&rm *.pub
    set -x
    saPub
    saKey
    caCrt
    caKey
    frontProxyCrt
    frontProxyKey
    caConfig
    etcdServer
    etcdPeer
    etcdClient
    frontProxyClient
    apiServer
    apiKubClient
    # $cs gencert -initca  ca-csr.json |$csj -bare ca
    # mv ca.pem ca.crt&&mv ca-key.pem ca.key
    $cs gencert -ca=ca.crt -ca-key=ca.key -config=ca-config.json -profile=server etcd-server.json|$csj -bare server
    $cs gencert -ca=ca.crt -ca-key=ca.key -config=ca-config.json -profile=client etcd-client.json|$csj -bare client
    $cs gencert -ca=ca.crt -ca-key=ca.key -config=ca-config.json -profile=peer etcd-peer.json|$csj -bare peer
    $cs gencert -ca=front-proxy-ca.crt -ca-key=front-proxy-ca.key -config=ca-config.json -profile=client front-proxy-client.json|$csj -bare front-proxy-client
    $cs gencert -ca=ca.crt -ca-key=ca.key -config=ca-config.json -profile=server apiserver.json|$csj -bare apiserver
    $cs gencert -ca=ca.crt -ca-key=ca.key -config=ca-config.json -profile=client apiserver-kubelet-client.json|$csj -bare apiserver-kubelet-client

		mkdir -p $pki_dir/etcd

    cp server.pem $pki_dir/etcd/server.crt&cp server-key.pem $pki_dir/etcd/server.key
    cp client.pem $pki_dir/etcd/healthcheck-client.crt&&cp client-key.pem $pki_dir/etcd/healthcheck-client.key
    cp client.pem $pki_dir/apiserver-etcd-client.crt&&cp client-key.pem $pki_dir/apiserver-etcd-client.key
    cp peer.pem $pki_dir/etcd/peer.crt&&cp peer-key.pem $pki_dir/etcd/peer.key
    cp ca.crt $pki_dir/etcd/ca.crt&&cp ca.key $pki_dir/etcd/ca.key

    cp front-proxy-ca.crt $pki_dir/front-proxy-ca.crt&&cp front-proxy-ca.key $pki_dir/front-proxy-ca.key
    cp front-proxy-client.pem $pki_dir/front-proxy-client.crt&&cp front-proxy-client-key.pem $pki_dir/front-proxy-client.key

    cp ca.crt $pki_dir/ca.crt&&cp ca.key $pki_dir/ca.key
    cp apiserver.pem $pki_dir/apiserver.crt&cp apiserver-key.pem $pki_dir/apiserver.key
    cp apiserver-kubelet-client.pem $pki_dir/apiserver-kubelet-client.crt&&cp apiserver-kubelet-client-key.pem $pki_dir/apiserver-kubelet-client.key

    cp sa.pub $pki_dir/sa.pub&&cp sa.key $pki_dir/sa.key

    rm *.csr&&rm *.json&&rm *.crt&&rm *.key&&rm *.pem&&rm *.pub

    echo "================================="
		echo "all k8s cert（include etcd） create success"

}

# etcd容器化安装，最好需要在所有master节点上先安装好etcd
function etcd_install() {
		# 如果有以前数据，先清除
		set +e
		docker stop etcd && docker rm etcd
		rm -rf ${etcd_data_dir}/*
		systemctl restart docker
		set -e

		# 运行docker
		docker run \
		   -d \
		   -p ${ETCD_CLI_PORT}:${ETCD_CLI_PORT} \
		   -p ${ETCD_CLU_PORT}:${ETCD_CLU_PORT} \
		   --volume=${etcd_data_dir}:${etcd_data_dir} \
		   --volume=${pki_dir}:${pki_dir} \
		   --name etcd ${REGISTRY}/etcd-amd64:${ETCD_VERSION} \
		   /usr/local/bin/etcd \
		   --data-dir=/etcd-data --name ${THIS_HOST} \
		   --initial-advertise-peer-urls http://${THIS_HOST}:${ETCD_CLU_PORT} \
		   --listen-peer-urls http://0.0.0.0:${ETCD_CLU_PORT} \
		   --advertise-client-urls https://${THIS_HOST}:${ETCD_CLI_PORT} \
		   --listen-client-urls https://0.0.0.0:${ETCD_CLI_PORT} \
		   --initial-cluster ${CLUSTER} \
		   --initial-cluster-state ${CLUSTER_STATE} \
		   --initial-cluster-token ${TOKEN} \
		   --cert-file=${pki_dir}/etcd/server.crt \
		   --key-file=${pki_dir}/etcd/server.key \
		   --trusted-ca-file=${pki_dir}/etcd/ca.crt

    echo "================================="
		echo "etcd start success"
}

function etcd_reset() {
	set +e
	docker stop etcd
	rm -rf ${etcd_data_dir}/*
	docker rm etcd
	set -e

}

#master安装及附带操作
function master_install(){
		ipvsadm -C
		kubeadm  init --config $kubeadm_conf
		mkdir -p $HOME/.kube
		\cp -f /etc/kubernetes/admin.conf $HOME/.kube/config
		chown $(id -u):$(id -g) $HOME/.kube/config
		#为docker生成config文件
  	General_user_HOME=`cat /etc/passwd |grep  -e ^${General_user} |awk -F: '{print $6}'`
  	mkdir -p ${General_user_HOME}/.kube
  	\cp -f /etc/kubernetes/admin.conf ${General_user_HOME}/.kube/config
  	chown -R $(id -u ${General_user}):$(id -g ${General_user}) ${General_user_HOME}/.kube
  	chown $(id -u ${General_user}):$(id -g ${General_user}) ${General_user_HOME}/.kube/config
  	#应用flannel及节点证书自动验证
		kubectl apply -f $auto_cet_server
		kubectl apply -f $flannel

		rm $kubeadm_conf
		rm $auto_cet_server
		rm $flannel
		echo "================================="
		echo "master install success（include flannel and node cert auto approv）"
}

#node节点加入命令，由于设置了token为0s，所以token可以固定下来。
function node_join(){
		system_init
		kubeadm join ${K8S_DOMAIN}:${K8S_API_PORT} --token ${K8S_JOIN_TOKEN} --discovery-token-unsafe-skip-ca-verification
		echo "================================="
		echo "node join success"
}

#命令shell选项，产生分叉
case ${OP_STEP} in
	"etcd")
	ip_in_cluster
	system_init
	cert_init
	etcd_install
	;;
	"etcd_reset")
	ip_in_cluster
	etcd_reset
	;;
	"master")
	ip_in_cluster
	master_install
	;;
	"node")
	node_join
	;;
	*)
	echo "usage `basename $0` [K8S_DOMAIN] [etcd|master|node]"
	;;
esac

　　

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