这篇文章主要介绍如何使用二进制方式搭建K8S高可用集群，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！

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1、系统概述

操作系统版本：CentOS7.5

k8s版本：1.12

系统要求：关闭swap、selinux、iptables

具体信息：

拓扑图：

二进制包下载地址

etcd:

https://github.com/coreos/etcd/releases/tag/v3.2.12

flannel:

https://github.com/coreos/flannel/releases/download/v0.10.0/flannel-v0.10.0-linux-amd64.tar.gz

k8s:

https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.12.md

2、自签Etcd SSL证书

master01操作：

# cat cfssl.sh
#!/bin/bash
wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64
chmod +x cfssl_linux-amd64 cfssljson_linux-amd64 cfssl-certinfo_linux-amd64
mv cfssl_linux-amd64 /usr/local/bin/cfssl
mv cfssljson_linux-amd64 /usr/local/bin/cfssljson
mv cfssl-certinfo_linux-amd64 /usr/bin/cfssl-certinfo

自签Etcd SSL证书

# cat cert-etcd.sh
cat > ca-config.json < ca-csr.json < server-csr.json <
# ll *.pem
-rw------- 1 root root 1675 Jan 11 15:50 ca-key.pem
-rw-r--r-- 1 root root 1265 Jan 11 15:50 ca.pem
-rw------- 1 root root 1679 Jan 11 15:50 server-key.pem
-rw-r--r-- 1 root root 1338 Jan 11 15:50 server.pem
3、Etcd数据库集群部署
master01 02 03操作:
# mkdir -pv /opt/etcd/{bin,cfg,ssl}
# tar zxvf etcd-v3.2.12-linux-amd64.tar.gz
# mv etcd-v3.2.12-linux-amd64/{etcd,etcdctl} /opt/etcd/bin/
master01操作:
# cd cert-etcd/
[root@master01 cert-etcd]# ll
total 40
-rw-r--r-- 1 root root  287 Jan 11 15:50 ca-config.json
-rw-r--r-- 1 root root  956 Jan 11 15:50 ca.csr
-rw-r--r-- 1 root root  209 Jan 11 15:50 ca-csr.json
-rw------- 1 root root 1675 Jan 11 15:50 ca-key.pem
-rw-r--r-- 1 root root 1265 Jan 11 15:50 ca.pem
-rw-r--r-- 1 root root 1013 Jan 11 15:50 server.csr
-rw-r--r-- 1 root root  296 Jan 11 15:50 server-csr.json
-rw------- 1 root root 1679 Jan 11 15:50 server-key.pem
-rw-r--r-- 1 root root 1338 Jan 11 15:50 server.pem
-rwxr-xr-x 1 root root 1076 Jan 11 15:50 ssl-etcd.sh
[root@master01 cert-etcd]# cp *.pem /opt/etcd/ssl/
# scp -r /opt/etcd master02:/opt/
# scp -r /opt/etcd master03:/opt/
分别在master01 02 03操作:
# cat etcd.sh 
#!/bin/bash
# example: ./etcd.sh etcd01 192.168.1.10 etcd02=https://192.168.1.11:2380,etcd03=https://192.168.1.12:2380

ETCD_NAME=$1
ETCD_IP=$2
ETCD_CLUSTER=$3

WORK_DIR=/opt/etcd

cat <$WORK_DIR/cfg/etcd
#[Member]
ETCD_NAME="${ETCD_NAME}"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://${ETCD_IP}:2380"
ETCD_LISTEN_CLIENT_URLS="https://${ETCD_IP}:2379"

#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://${ETCD_IP}:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://${ETCD_IP}:2379"
ETCD_INITIAL_CLUSTER="${ETCD_NAME}=https://${ETCD_IP}:2380,${ETCD_CLUSTER}"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF


cat </usr/lib/systemd/system/etcd.service
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
Type=notify
EnvironmentFile=${WORK_DIR}/cfg/etcd
ExecStart=${WORK_DIR}/bin/etcd \
--name=\${ETCD_NAME} \
--data-dir=\${ETCD_DATA_DIR} \
--listen-peer-urls=\${ETCD_LISTEN_PEER_URLS} \
--listen-client-urls=\${ETCD_LISTEN_CLIENT_URLS},http://127.0.0.1:2379 \
--advertise-client-urls=\${ETCD_ADVERTISE_CLIENT_URLS} \
--initial-advertise-peer-urls=\${ETCD_INITIAL_ADVERTISE_PEER_URLS} \
--initial-cluster=\${ETCD_INITIAL_CLUSTER} \
--initial-cluster-token=\${ETCD_INITIAL_CLUSTER_TOKEN} \
--initial-cluster-state=new \
--cert-file=${WORK_DIR}/ssl/server.pem \
--key-file=${WORK_DIR}/ssl/server-key.pem \
--peer-cert-file=${WORK_DIR}/ssl/server.pem \
--peer-key-file=${WORK_DIR}/ssl/server-key.pem \
--trusted-ca-file=${WORK_DIR}/ssl/ca.pem \
--peer-trusted-ca-file=${WORK_DIR}/ssl/ca.pem
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
EOF

systemctl daemon-reload
systemctl start etcd
systemctl enable etcd
# ./etcd.sh etcd01 192.168.247.161 etcd02=https://192.168.247.162:2380,etcd03=https://192.168.247.163:2380
# scp etcd.sh master02:/root/
# scp etcd.sh master03:/root/
[root@master02 ~]# ./etcd.sh etcd02 192.168.247.162 etcd01=https://192.168.247.161:2380,etcd03=https://192.168.247.163:2380
[root@master03 ~]# ./etcd.sh etcd03 192.168.247.163 etcd01=https://192.168.247.161:2380,etcd02=https://192.168.247.162:2380
[root@master01 ~]# systemctl restart etcd
# cd /opt/etcd/ssl
# /opt/etcd/bin/etcdctl \
--ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem \
--endpoints="https://192.168.247.161:2379,https://192.168.247.162:2379,https://192.168.247.163:2379" \
cluster-health
member 1afd7ff8f95cf93 is healthy: got healthy result from https://192.168.247.161:2379
member 8f4e6ce663f0d49a is healthy: got healthy result from https://192.168.247.162:2379
member b6230d9c6f20feeb is healthy: got healthy result from https://192.168.247.163:2379
cluster is healthy
如有报错，查看/var/log/message日志
4、node节点安装docker
可以放到脚本内执行
# cat docker.sh
yum remove -y docker docker-common docker-selinux docker-engine 
yum install -y yum-utils device-mapper-persistent-data lvm2
wget -O /etc/yum.repos.d/docker-ce.repo https://download.docker.com/linux/centos/docker-ce.repo
sed -i 's+download.docker.com+mirrors.tuna.tsinghua.edu.cn/docker-ce+' /etc/yum.repos.d/docker-ce.repo
yum makecache fast
yum install -y docker-ce 
systemctl enable docker
systemctl start docker
docker version
如果拉取镜像较慢，可以配置daocloud提供的docker加速器
5、Flannel网络部署
master01执行：
# pwd
/opt/etcd/ssl
# /opt/etcd/bin/etcdctl \
--ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem \
--endpoints="https://192.168.247.161:2379,https://192.168.247.162:2379,https://192.168.247.163:2379" \
set /coreos.com/network/config  '{ "Network": "172.17.0.0/16", "Backend": {"Type": "vxlan"}}'
node01执行:
# wget https://github.com/coreos/flannel/releases/download/v0.10.0/flannel-v0.10.0-linux-amd64.tar.gz
# tar zxvf flannel-v0.10.0-linux-amd64.tar.gz
# mkdir -pv /opt/kubernetes/{bin,cfg,ssl}
# mv flanneld mk-docker-opts.sh /opt/kubernetes/bin/
# cat /opt/kubernetes/cfg/flanneld
FLANNEL_OPTIONS="--etcd-endpoints=https://192.168.247.161:2379,https://192.168.247.162:2379,https://192.168.247.163:2379 -etcd-cafile=/opt/etcd/ssl/ca.pem -etcd-certfile=/opt/etcd/ssl/server.pem -etcd-keyfile=/opt/etcd/ssl/server-key.pem"
将master节点的/opt/etcd/ssl/*拷贝到node节点
[root@master01 ~]# scp -r /opt/etcd/ssl node01:/opt/etcd/
# cat /usr/lib/systemd/system/flanneld.service
[Unit]
Description=Flanneld overlay address etcd agent
After=network-online.target network.target
Before=docker.service

[Service]
Type=notify
EnvironmentFile=/opt/kubernetes/cfg/flanneld
ExecStart=/opt/kubernetes/bin/flanneld --ip-masq $FLANNEL_OPTIONS
ExecStartPost=/opt/kubernetes/bin/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/subnet.env
Restart=on-failure

[Install]
WantedBy=multi-user.target
# cat /usr/lib/systemd/system/docker.service 
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service
Wants=network-online.target

[Service]
Type=notify
EnvironmentFile=/run/flannel/subnet.env
ExecStart=/usr/bin/dockerd $DOCKER_NETWORK_OPTIONS
ExecReload=/bin/kill -s HUP $MAINPID
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
TimeoutStartSec=0
Delegate=yes
KillMode=process
Restart=on-failure
StartLimitBurst=3
StartLimitInterval=60s

[Install]
WantedBy=multi-user.target
重启flannel和docker：
# systemctl daemon-reload
# systemctl start flanneld
# systemctl enable flanneld
# systemctl restart docker
# systemctl enable docker
# cat /run/flannel/subnet.env 
DOCKER_OPT_BIP="--bip=172.17.12.1/24"
DOCKER_OPT_IPMASQ="--ip-masq=false"
DOCKER_OPT_MTU="--mtu=1450"
DOCKER_NETWORK_OPTIONS=" --bip=172.17.12.1/24 --ip-masq=false --mtu=1450"
# ip a
5: docker0:  mtu 1500 qdisc noqueue state DOWN group default 
    link/ether 02:42:f0:62:07:73 brd ff:ff:ff:ff:ff:ff
    inet 172.17.12.1/24 brd 172.17.12.255 scope global docker0
       valid_lft forever preferred_lft forever
6: flannel.1:  mtu 1450 qdisc noqueue state UNKNOWN group default 
    link/ether ca:e9:e0:d4:05:be brd ff:ff:ff:ff:ff:ff
    inet 172.17.12.0/32 scope global flannel.1
       valid_lft forever preferred_lft forever
    inet6 fe80::c8e9:e0ff:fed4:5be/64 scope link 
       valid_lft forever preferred_lft forever
 将介质及配置文件拷贝至node02节点
# scp -r /opt/kubernetes node02:/opt/
# cd /usr/lib/systemd/system/
# scp flanneld.service docker.service node02:/usr/lib/systemd/system/
# scp -r /opt/etcd/ssl/ node02:/opt/etcd/
node02执行：
# mkdir /opt/etcd
# systemctl daemon-reload
# systemctl start flanneld
# systemctl enable flanneld
# systemctl restart docker
# ip a
5: docker0:  mtu 1500 qdisc noqueue state DOWN group default 
    link/ether 02:42:ca:2c:48:df brd ff:ff:ff:ff:ff:ff
    inet 172.17.16.1/24 brd 172.17.16.255 scope global docker0
       valid_lft forever preferred_lft forever
6: flannel.1:  mtu 1450 qdisc noqueue state UNKNOWN group default 
    link/ether ee:73:b2:e8:46:c1 brd ff:ff:ff:ff:ff:ff
    inet 172.17.16.0/32 scope global flannel.1
       valid_lft forever preferred_lft forever
    inet6 fe80::ec73:b2ff:fee8:46c1/64 scope link 
       valid_lft forever preferred_lft forever
网络测试：
[root@node02 opt]# ping 172.17.12.1
PING 172.17.12.1 (172.17.12.1) 56(84) bytes of data.
64 bytes from 172.17.12.1: icmp_seq=1 ttl=64 time=1.07 ms
64 bytes from 172.17.12.1: icmp_seq=2 ttl=64 time=0.300 ms
[root@node01 system]# ping 172.17.16.1
PING 172.17.16.1 (172.17.16.1) 56(84) bytes of data.
64 bytes from 172.17.16.1: icmp_seq=1 ttl=64 time=1.13 ms
6、自签APIServer SSL证书
在master01执行：
# cat cert-k8s.sh
#创建ca证书
cat > ca-config.json < ca-csr.json < server-csr.json < kube-proxy-csr.json < admin-csr.json <
# ll *.pem
-rw------- 1 root root 1679 Jan 11 22:06 admin-key.pem
-rw-r--r-- 1 root root 1399 Jan 11 22:06 admin.pem
-rw------- 1 root root 1679 Jan 11 22:06 ca-key.pem
-rw-r--r-- 1 root root 1359 Jan 11 22:06 ca.pem
-rw------- 1 root root 1675 Jan 11 22:06 kube-proxy-key.pem
-rw-r--r-- 1 root root 1403 Jan 11 22:06 kube-proxy.pem
-rw------- 1 root root 1679 Jan 11 22:06 server-key.pem
-rw-r--r-- 1 root root 1651 Jan 11 22:06 server.pem
7、部署Master组件
master01、02、03执行：
# mkdir -pv /opt/kubernetes/{bin,cfg,ssl}
# tar zxvf kubernetes-server-linux-amd64.tar.gz
# cd kubernetes/server/bin
# cp kube-apiserver kube-scheduler kube-controller-manager kubectl /opt/kubernetes/bin/

# pwd
/root/cert-k8s
# cp *.pem /opt/kubernetes/ssl/

# head -c 16 /dev/urandom |od -An -t x |tr -d  ' '
1c96cf8a12d4555a52e89bf3925a5c87

# cat /opt/kubernetes/cfg/token.csv
1c96cf8a12d4555a52e89bf3925a5c87,kubelet-bootstrap,10001,"system:kubelet-bootstrap"
1)、api-server:
# cat api-server.sh 
#!/bin/bash
# example: ./api-server.sh 192.168.247.161 https://192.168.247.161:2379,https://192.168.247.162:2379,https://192.168.247.163:2379
MASTER_IP=$1
ETCD_SERVERS=$2

cat < /opt/kubernetes/cfg/kube-apiserver 

KUBE_APISERVER_OPTS="--logtostderr=true \\
--v=4 \\
--etcd-servers=${ETCD_SERVERS} \\
--bind-address=${MASTER_IP} \\
--secure-port=6443 \\
--advertise-address=${MASTER_IP} \\
--allow-privileged=true \\
--service-cluster-ip-range=10.0.0.0/24 \\
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota,NodeRestriction \\
--authorization-mode=RBAC,Node \\
--enable-bootstrap-token-auth \\
--token-auth-file=/opt/kubernetes/cfg/token.csv \\
--service-node-port-range=30000-50000 \\
--tls-cert-file=/opt/kubernetes/ssl/server.pem  \\
--tls-private-key-file=/opt/kubernetes/ssl/server-key.pem \\
--client-ca-file=/opt/kubernetes/ssl/ca.pem \\
--service-account-key-file=/opt/kubernetes/ssl/ca-key.pem \\
--etcd-cafile=/opt/etcd/ssl/ca.pem \\
--etcd-certfile=/opt/etcd/ssl/server.pem \\
--etcd-keyfile=/opt/etcd/ssl/server-key.pem"
EOF

cat </usr/lib/systemd/system/kube-apiserver.service 
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes

[Service]
EnvironmentFile=-/opt/kubernetes/cfg/kube-apiserver
ExecStart=/opt/kubernetes/bin/kube-apiserver \$KUBE_APISERVER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF

systemctl daemon-reload
systemctl enable kube-apiserver
systemctl restart kube-apiserver
# ./api-server.sh 192.168.247.161 https://192.168.247.161:2379,https://192.168.247.162:2379,https://192.168.247.163:2379
2)、scheduler组件
# cat scheduler.sh
cat </opt/kubernetes/cfg/kube-scheduler 
KUBE_SCHEDULER_OPTS="--logtostderr=true \\
--v=4 \\
--master=127.0.0.1:8080 \\
--leader-elect"
EOF

cat </usr/lib/systemd/system/kube-scheduler.service 
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes

[Service]
EnvironmentFile=-/opt/kubernetes/cfg/kube-scheduler
ExecStart=/opt/kubernetes/bin/kube-scheduler \$KUBE_SCHEDULER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF

systemctl daemon-reload
systemctl enable kube-scheduler
systemctl restart kube-scheduler

# ./scheduler.sh


部署controller-manager组件

# cat controller-manager.sh
cat </opt/kubernetes/cfg/kube-controller-manager 
KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=true \
--v=4 \\
--master=127.0.0.1:8080 \\
--leader-elect=true \\
--address=127.0.0.1 \\
--service-cluster-ip-range=10.0.0.0/24 \\
--cluster-name=kubernetes \\
--cluster-signing-cert-file=/opt/kubernetes/ssl/ca.pem \\
--cluster-signing-key-file=/opt/kubernetes/ssl/ca-key.pem  \\
--root-ca-file=/opt/kubernetes/ssl/ca.pem \\
--service-account-private-key-file=/opt/kubernetes/ssl/ca-key.pem"
EOF

cat </usr/lib/systemd/system/kube-controller-manager.service 
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes

[Service]
EnvironmentFile=-/opt/kubernetes/cfg/kube-controller-manager
ExecStart=/opt/kubernetes/bin/kube-controller-manager \$KUBE_CONTROLLER_MANAGER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF

systemctl daemon-reload
systemctl enable kube-controller-manager
systemctl restart kube-controller-manager
# sh controller-manager.sh
添加环境变量
K8S_HOME=/opt/kubernetes
PATH=$K8S_HOME/bin:$PATH
[root@master01 ~]# kubectl get cs
# kubectl get cs
NAME                 STATUS    MESSAGE              ERROR
scheduler            Healthy   ok                   
controller-manager   Healthy   ok                   
etcd-1               Healthy   {"health": "true"}   
etcd-2               Healthy   {"health": "true"}   
etcd-0               Healthy   {"health": "true"}  

[root@master02 ~]# kubectl get cs
NAME                 STATUS    MESSAGE              ERROR
scheduler            Healthy   ok                   
controller-manager   Healthy   ok                   
etcd-2               Healthy   {"health": "true"}   
etcd-0               Healthy   {"health": "true"}   
etcd-1               Healthy   {"health": "true"}   

[root@master03 ~]# kubectl get cs
NAME                 STATUS    MESSAGE              ERROR
scheduler            Healthy   ok                   
controller-manager   Healthy   ok                   
etcd-1               Healthy   {"health": "true"}   
etcd-0               Healthy   {"health": "true"}   
etcd-2               Healthy   {"health": "true"}
8、生成Node kubeconfig文件
[root@master01 ~]# scp kubernetes/server/bin/{kubelet,kube-proxy} node01:/opt/kubernetes/bin/
[root@master01 ~]# scp kubernetes/server/bin/{kubelet,kube-proxy} node02:/opt/kubernetes/bin/
master01执行：
kubectl create clusterrolebinding kubelet-bootstrap \
--clusterrole=system:node-bootstrapper \
--user=kubelet-bootstrap
在master01执行：
cat kubeconfig.sh
# 创建kubelet bootstrapping kubeconfig 
APISERVER=$1
SSL_DIR=$2

export BOOTSTRAP_TOKEN=`cat /opt/kubernetes/cfg/token.csv |awk -F',' '{print $1}'`
export KUBE_APISERVER="https://$APISERVER:6443"

# 设置集群参数
kubectl config set-cluster kubernetes \
  --certificate-authority=$SSL_DIR/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=bootstrap.kubeconfig

# 设置客户端认证参数
kubectl config set-credentials kubelet-bootstrap \
  --token=${BOOTSTRAP_TOKEN} \
  --kubeconfig=bootstrap.kubeconfig

# 设置上下文参数
kubectl config set-context default \
  --cluster=kubernetes \
  --user=kubelet-bootstrap \
  --kubeconfig=bootstrap.kubeconfig

# 设置默认上下文
kubectl config use-context default --kubeconfig=bootstrap.kubeconfig

#----------------------

# 创建kube-proxy kubeconfig文件

kubectl config set-cluster kubernetes \
  --certificate-authority=$SSL_DIR/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=kube-proxy.kubeconfig

kubectl config set-credentials kube-proxy \
  --client-certificate=$SSL_DIR/kube-proxy.pem \
  --client-key=$SSL_DIR/kube-proxy-key.pem \
  --embed-certs=true \
  --kubeconfig=kube-proxy.kubeconfig

kubectl config set-context default \
  --cluster=kubernetes \
  --user=kube-proxy \
  --kubeconfig=kube-proxy.kubeconfig

kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig
# ./kubeconfig.sh 192.168.247.160 /opt/kubernetes/ssl
# ll
total 16
-rw------- 1 root root 2169 Jan 12 08:09 bootstrap.kubeconfig
-rwxr-xr-x 1 root root 1419 Jan 12 08:07 kubeconfig.sh
-rw------- 1 root root 6271 Jan 12 08:09 kube-proxy.kubeconfig
# scp bootstrap.kubeconfig kube-proxy.kubeconfig node01:/opt/kubernetes/cfg/
# scp bootstrap.kubeconfig kube-proxy.kubeconfig node02:/opt/kubernetes/cfg/
9、部署Node组件
在node01、02执行：
1)、部署kubelet组件
cat kubelet.sh
#!/bin/bash
NODE_IP=$1

cat </opt/kubernetes/cfg/kubelet
KUBELET_OPTS="--logtostderr=true \\
--v=4 \\
--address=${NODE_IP} \\
--hostname-override=${NODE_IP} \\
--kubeconfig=/opt/kubernetes/cfg/kubelet.kubeconfig \\
--bootstrap-kubeconfig=/opt/kubernetes/cfg/bootstrap.kubeconfig \\
--config=/opt/kubernetes/cfg/kubelet.config \\
--cert-dir=/opt/kubernetes/ssl \\
--pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google-containers/pause-amd64:3.0"
EOF

cat </opt/kubernetes/cfg/kubelet.config
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address: ${NODE_IP}
port: 10250
readOnlyPort: 10255
cgroupDriver: cgroupfs
clusterDNS: ["10.0.0.2"]
clusterDomain: cluster.local.
failSwapOn: false
authentication:
  anonymous:
    enabled: true 
EOF

cat </usr/lib/systemd/system/kubelet.service 
[Unit]
Description=Kubernetes Kubelet
After=docker.service
Requires=docker.service

[Service]
EnvironmentFile=/opt/kubernetes/cfg/kubelet
ExecStart=/opt/kubernetes/bin/kubelet \$KUBELET_OPTS
Restart=on-failure
KillMode=process

[Install]
WantedBy=multi-user.target
EOF

systemctl daemon-reload
systemctl enable kubelet
systemctl restart kubelet
# ./kubelet.sh 192.168.247.171
# ./kubelet.sh 192.168.247.172
2)、部署kube-proxy组件：
cat kube-proxy.sh
#!/bin/bash

NODE_IP=$1

cat </opt/kubernetes/cfg/kube-proxy
KUBE_PROXY_OPTS="--logtostderr=true \\
--v=4 \\
--hostname-override=${NODE_IP} \\
--cluster-cidr=10.0.0.0/24 \\
--proxy-mode=ipvs \\
--kubeconfig=/opt/kubernetes/cfg/kube-proxy.kubeconfig"
EOF

cat </usr/lib/systemd/system/kube-proxy.service 
[Unit]
Description=Kubernetes Proxy
After=network.target

[Service]
EnvironmentFile=-/opt/kubernetes/cfg/kube-proxy
ExecStart=/opt/kubernetes/bin/kube-proxy \$KUBE_PROXY_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF

systemctl daemon-reload
systemctl enable kube-proxy
systemctl restart kube-proxy
# ./kube-proxy.sh 192.168.247.171
# ./kube-proxy.sh 192.168.247.172
10、安装nginx
使用nginx四层进行转发
# cat nginx.repo 
[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/centos/7/$basearch/
gpgcheck=0
enabled=1
# yum install nginx
1) LB01和LB02配置：
nginx配置文件添加以下内容：
# cat /etc/nginx/nginx.conf
stream{
    log_format main "$remote_addr $upstream_addr $time_local $status";
    access_log /var/log/nginx/k8s-access.log main;
    upstream k8s-apiserver {
           server 192.168.247.161:6443;   
           server 192.168.247.162:6443;   
           server 192.168.247.163:6443;   
    }
    server {
           listen 0.0.0.0:6443;
           proxy_pass k8s-apiserver;
    }
}
11、安装keepalived
# yum install keepalived
# yum install libnl3-devel ipset-devel
# cat /etc/keepalived/check_nginx.sh 
#!/bin/bash
count=$(ps -ef |grep nginx |egrep -cv "grep|$$")
if [ "$count" -eq 0 ];then
   systemctl stop keeplived
fi
# chmod 755 check_nginx.sh
LB01配置：
# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
   notification_email {
     acassen@firewall.loc
     failover@firewall.loc
     sysadmin@firewall.loc
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
   vrrp_skip_check_adv_addr
   vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

vrrp_script check_nginx {
     script "/etc/keepalived/check_nginx.sh"
}

vrrp_instance VI_1 {
    state MASTER
    interface ens33
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.247.160/24
    }
    track_script {
        check_nginx
    }
}
LB02配置：
# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
   notification_email {
     acassen@firewall.loc
     failover@firewall.loc
     sysadmin@firewall.loc
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
   vrrp_skip_check_adv_addr
   vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

vrrp_script check_nginx {
     script "/etc/keepalived/check_nginx.sh"
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    virtual_router_id 51
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.247.160/24
    }
    track_script {
        check_nginx
    }
}
# systemctl enable nginx
# systemctl start nginx
# systemctl enable keepalived
# systemctl start keepalived
12、节点发现
# kubectl get csr
NAME                                                   AGE   REQUESTOR           CONDITION
node-csr-gvRm9pzQJCj4cp_hGYp5qwW93LLdAbVPtz7AaztlGv8   17m   kubelet-bootstrap   Pending
node-csr-luowueA4U43ca96d-Ff64X7o8p9BW6MGIxWfASUPukE   20m   kubelet-bootstrap   Pending
# kubectl certificate approve node-csr-gvRm9pzQJCj4cp_hGYp5qwW93LLdAbVPtz7AaztlGv8
certificatesigningrequest.certificates.k8s.io/node-csr-gvRm9pzQJCj4cp_hGYp5qwW93LLdAbVPtz7AaztlGv8 approved
# kubectl certificate approve node-csr-luowueA4U43ca96d-Ff64X7o8p9BW6MGIxWfASUPukE
certificatesigningrequest.certificates.k8s.io/node-csr-luowueA4U43ca96d-Ff64X7o8p9BW6MGIxWfASUPukE approved
# kubectl get node
NAME              STATUS   ROLES    AGE     VERSION
192.168.247.171   Ready       12s     v1.12.4
192.168.247.172   Ready       9m41s   v1.12.4
13、运行一个测试示例
# kubectl run nginx --image=nginx --replicas=3
# kubectl get pod -o wide
NAME                    READY   STATUS    RESTARTS   AGE   IP            NODE              NOMINATED NODE
nginx-dbddb74b8-dkhcw   1/1     Running   0          38m   172.17.35.2   192.168.247.172   
nginx-dbddb74b8-rdf2v   1/1     Running   0          38m   172.17.17.2   192.168.247.171   
nginx-dbddb74b8-rn9l6   1/1     Running   0          38m   172.17.35.3   192.168.247.172   
# kubectl expose deployment nginx --port=88 --target-port=80 --type=NodePort
service/nginx exposed
# kubectl get svc
NAME         TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)        AGE
kubernetes   ClusterIP   10.0.0.1             443/TCP        12h
nginx        NodePort    10.0.0.30            88:48363/TCP   6s
浏览器访问：
http://192.168.247.171:48363
http://192.168.247.172:48363
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