如何使用二进制方式搭建K8S高可用集群

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！

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/bashwget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64chmod +x cfssl_linux-amd64 cfssljson_linux-amd64 cfssl-certinfo_linux-amd64mv cfssl_linux-amd64 /usr/local/bin/cfsslmv cfssljson_linux-amd64 /usr/local/bin/cfssljsonmv cfssl-certinfo_linux-amd64 /usr/bin/cfssl-certinfo

自签Etcd SSL证书

# cat cert-etcd.shcat > 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]# lltotal 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://192.168.1.12:2380ETCD_NAME=$1ETCD_IP=$2ETCD_CLUSTER=$3WORK_DIR=/opt/etcdcat <$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"EOFcat </usr/lib/systemd/system/etcd.service[Unit]Description=Etcd ServerAfter=network.targetAfter=network-online.targetWants=network-online.target[Service]Type=notifyEnvironmentFile=${WORK_DIR}/cfg/etcdExecStart=${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.pemRestart=on-failureLimitNOFILE=65536[Install]WantedBy=multi-user.targetEOFsystemctl daemon-reloadsystemctl start etcdsystemctl 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-healthmember 1afd7ff8f95cf93 is healthy: got healthy result from https://192.168.247.161:2379member 8f4e6ce663f0d49a is healthy: got healthy result from https://192.168.247.162:2379member b6230d9c6f20feeb is healthy: got healthy result from https://192.168.247.163:2379cluster 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.shyum remove -y docker docker-common docker-selinux docker-engine yum install -y yum-utils device-mapper-persistent-data lvm2wget -O /etc/yum.repos.d/docker-ce.repo https://download.docker.com/linux/centos/docker-ce.reposed -i 's+download.docker.com+mirrors.tuna.tsinghua.edu.cn/docker-ce+' /etc/yum.repos.d/docker-ce.repoyum makecache fastyum install -y docker-ce systemctl enable dockersystemctl start dockerdocker 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/flanneldFLANNEL_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 agentAfter=network-online.target network.targetBefore=docker.service[Service]Type=notifyEnvironmentFile=/opt/kubernetes/cfg/flanneldExecStart=/opt/kubernetes/bin/flanneld --ip-masq $FLANNEL_OPTIONSExecStartPost=/opt/kubernetes/bin/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/subnet.envRestart=on-failure[Install]WantedBy=multi-user.target
# cat /usr/lib/systemd/system/docker.service [Unit]Description=Docker Application Container EngineDocumentation=https://docs.docker.comAfter=network-online.target firewalld.serviceWants=network-online.target[Service]Type=notifyEnvironmentFile=/run/flannel/subnet.envExecStart=/usr/bin/dockerd $DOCKER_NETWORK_OPTIONSExecReload=/bin/kill -s HUP $MAINPIDLimitNOFILE=infinityLimitNPROC=infinityLimitCORE=infinityTimeoutStartSec=0Delegate=yesKillMode=processRestart=on-failureStartLimitBurst=3StartLimitInterval=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 a5: 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 forever6: 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 a5: 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 forever6: 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 172.17.12.1PING 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 ms64 bytes from 172.17.12.1: icmp_seq=2 ttl=64 time=0.300 ms
[root@node01 system]# ping 172.17.16.1PING 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.csv1c96cf8a12d4555a52e89bf3925a5c87,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://192.168.247.163:2379MASTER_IP=$1ETCD_SERVERS=$2cat < /opt/kubernetes/cfg/kube-apiserver KUBE_APISERVER_OPTS="--logtostderr=true \\--v=4 \\--etcd-servers=${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"EOFcat </usr/lib/systemd/system/kube-apiserver.service [Unit]Description=Kubernetes API ServerDocumentation=https://github.com/kubernetes/kubernetes[Service]EnvironmentFile=-/opt/kubernetes/cfg/kube-apiserverExecStart=/opt/kubernetes/bin/kube-apiserver \$KUBE_APISERVER_OPTSRestart=on-failure[Install]WantedBy=multi-user.targetEOFsystemctl daemon-reloadsystemctl enable kube-apiserversystemctl 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.shcat </opt/kubernetes/cfg/kube-scheduler KUBE_SCHEDULER_OPTS="--logtostderr=true \\--v=4 \\--master=127.0.0.1:8080 \\--leader-elect"EOFcat </usr/lib/systemd/system/kube-scheduler.service [Unit]Description=Kubernetes SchedulerDocumentation=https://github.com/kubernetes/kubernetes[Service]EnvironmentFile=-/opt/kubernetes/cfg/kube-schedulerExecStart=/opt/kubernetes/bin/kube-scheduler \$KUBE_SCHEDULER_OPTSRestart=on-failure[Install]WantedBy=multi-user.targetEOFsystemctl daemon-reloadsystemctl enable kube-schedulersystemctl restart kube-scheduler# ./scheduler.sh部署controller-manager组件# cat controller-manager.shcat </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"EOFcat </usr/lib/systemd/system/kube-controller-manager.service [Unit]Description=Kubernetes Controller ManagerDocumentation=https://github.com/kubernetes/kubernetes[Service]EnvironmentFile=-/opt/kubernetes/cfg/kube-controller-managerExecStart=/opt/kubernetes/bin/kube-controller-manager \$KUBE_CONTROLLER_MANAGER_OPTSRestart=on-failure[Install]WantedBy=multi-user.targetEOFsystemctl daemon-reloadsystemctl enable kube-controller-managersystemctl restart kube-controller-manager
# sh controller-manager.sh
添加环境变量
K8S_HOME=/opt/kubernetesPATH=$K8S_HOME/bin:$PATH
[root@master01 ~]# kubectl get cs# kubectl get csNAME                 STATUS    MESSAGE              ERRORscheduler            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 csNAME                 STATUS    MESSAGE              ERRORscheduler            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 csNAME                 STATUS    MESSAGE              ERRORscheduler            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=$1SSL_DIR=$2export 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=${KUBE_APISERVER} \  --kubeconfig=kube-proxy.kubeconfigkubectl config set-credentials kube-proxy \  --client-certificate=$SSL_DIR/kube-proxy.pem \  --client-key=$SSL_DIR/kube-proxy-key.pem \  --embed-certs=true \  --kubeconfig=kube-proxy.kubeconfigkubectl config set-context default \  --cluster=kubernetes \  --user=kube-proxy \  --kubeconfig=kube-proxy.kubeconfigkubectl config use-context default --kubeconfig=kube-proxy.kubeconfig
# ./kubeconfig.sh 192.168.247.160 /opt/kubernetes/ssl
# lltotal 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/bashNODE_IP=$1cat </opt/kubernetes/cfg/kubeletKUBELET_OPTS="--logtostderr=true \\--v=4 \\--address=${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"EOFcat </opt/kubernetes/cfg/kubelet.configkind: KubeletConfigurationapiVersion: kubelet.config.k8s.io/v1beta1address: ${NODE_IP}port: 10250readOnlyPort: 10255cgroupDriver: cgroupfsclusterDNS: ["10.0.0.2"]clusterDomain: cluster.local.failSwapOn: falseauthentication:  anonymous:    enabled: true EOFcat </usr/lib/systemd/system/kubelet.service [Unit]Description=Kubernetes KubeletAfter=docker.serviceRequires=docker.service[Service]EnvironmentFile=/opt/kubernetes/cfg/kubeletExecStart=/opt/kubernetes/bin/kubelet \$KUBELET_OPTSRestart=on-failureKillMode=process[Install]WantedBy=multi-user.targetEOFsystemctl daemon-reloadsystemctl enable kubeletsystemctl 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/bashNODE_IP=$1cat </opt/kubernetes/cfg/kube-proxyKUBE_PROXY_OPTS="--logtostderr=true \\--v=4 \\--hostname-override=${NODE_IP} \\--cluster-cidr=10.0.0.0/24 \\--proxy-mode=ipvs \\--kubeconfig=/opt/kubernetes/cfg/kube-proxy.kubeconfig"EOFcat </usr/lib/systemd/system/kube-proxy.service [Unit]Description=Kubernetes ProxyAfter=network.target[Service]EnvironmentFile=-/opt/kubernetes/cfg/kube-proxyExecStart=/opt/kubernetes/bin/kube-proxy \$KUBE_PROXY_OPTSRestart=on-failure[Install]WantedBy=multi-user.targetEOFsystemctl daemon-reloadsystemctl enable kube-proxysystemctl 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 repobaseurl=http://nginx.org/packages/centos/7/$basearch/gpgcheck=0enabled=1
# yum install nginx
1) LB01和LB02配置：
nginx配置文件添加以下内容：
# cat /etc/nginx/nginx.confstream{    log_format main "$remote_addr $upstream_addr $time_local $status";    access_log /var/log/nginx/k8s-access.log main;    upstream k8s-apiserver {           server 192.168.247.161:6443;              server 192.168.247.162:6443;              server 192.168.247.163:6443;       }    server {           listen 0.0.0.0:6443;           proxy_pass k8s-apiserver;    }}
11、安装keepalived
# yum install keepalived# yum install libnl3-devel ipset-devel
# cat /etc/keepalived/check_nginx.sh #!/bin/bashcount=$(ps -ef |grep nginx |egrep -cv "grep|$$")if [ "$count" -eq 0 ];then   systemctl stop keeplivedfi
# chmod 755 check_nginx.sh
LB01配置：
# cat /etc/keepalived/keepalived.conf! Configuration File for keepalivedglobal_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 keepalivedglobal_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 csrNAME                                                   AGE   REQUESTOR           CONDITIONnode-csr-gvRm9pzQJCj4cp_hGYp5qwW93LLdAbVPtz7AaztlGv8   17m   kubelet-bootstrap   Pendingnode-csr-luowueA4U43ca96d-Ff64X7o8p9BW6MGIxWfASUPukE   20m   kubelet-bootstrap   Pending# kubectl certificate approve node-csr-gvRm9pzQJCj4cp_hGYp5qwW93LLdAbVPtz7AaztlGv8certificatesigningrequest.certificates.k8s.io/node-csr-gvRm9pzQJCj4cp_hGYp5qwW93LLdAbVPtz7AaztlGv8 approved# kubectl certificate approve node-csr-luowueA4U43ca96d-Ff64X7o8p9BW6MGIxWfASUPukEcertificatesigningrequest.certificates.k8s.io/node-csr-luowueA4U43ca96d-Ff64X7o8p9BW6MGIxWfASUPukE approved# kubectl get nodeNAME              STATUS   ROLES    AGE     VERSION192.168.247.171   Ready       12s     v1.12.4192.168.247.172   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 wideNAME                    READY   STATUS    RESTARTS   AGE   IP            NODE              NOMINATED NODEnginx-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=NodePortservice/nginx exposed# kubectl get svcNAME         TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)        AGEkubernetes   ClusterIP   10.0.0.1             443/TCP        12hnginx        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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