服务器环境

角色	IP
master1	192.168.18.10
master2	192.168.18.40
node1	192.168.18.20
node2	192.168.18.30
LB1	192.168.18.50
LB2	192.168.18.60
VIP	192.168.18.70

Tips：其他节点已在单节点部署

实验步骤

Master2节点部署

1. 拷贝Master1上面的文件到Master2上面

  scp -r /opt/kubernetes/ root@192.168.18.40:/opt/
  scp -r /usr/lib/systemd/system/{kube-apiserver,kube-scheduler,kube-controller-manager}.service root@192.168.18.40:/usr/lib/systemd/system/
  scp -r /opt/etcd/ root@192.168.18.40:/opt/

2. 修改Master2上的配置文件

  vim /opt/kubernetes/cfg/kube-apiserver
  #只需要修改：
  --bind-address=192.168.18.40 \
  --advertise-address=192.168.18.40 \

3. 启动服务

  systemctl start kube-apiserver
  systemctl enable kube-apiserver
  systemctl start kube-controller-manager
  systemctl enable kube-controller-manager
  systemctl start kube-scheduler 
  systemctl enable kube-scheduler

4. 添加环境变量

  vim /etc/profile
  #末行添加
  export PATH=$PATH:/opt/kubernetes/bin

  source /etc/profile

5. 查看节点

  kubectl get node

LB1,2负载均衡部署

1. 关闭防火墙及核心防护

  systemctl stop firewalld
  systemctl disable firewalld
  setenforce 0

2. 配置nginx的yum源

vim /etc/yum.repos.d/nginx.repo

[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/centos/7/$basearch/
gpgcheck=0

#加载yum仓库
yum list

3. 安装nginx

yum install nginx -y

4. 添加四层转发

vim /etc/nginx/nginx.conf 
#在events和http中间添加
stream {

   log_format  main  '$remote_addr $upstream_addr - [$time_local] $status $upstream_bytes_sent';
    access_log  /var/log/nginx/k8s-access.log  main;
    
    upstream k8s-apiserver {
        server 192.168.18.10:6443;
        server 192.168.18.40:6443;
    }   
    server {
                listen 6443;
                proxy_pass k8s-apiserver;
    }           
    }

5. 网页测试

vim /usr/share/nginx/html/index.html
#LB1
<h1>Welcome to master nginx!</h1>
#LB2
<h1>Welcome to backup nginx!</h1>

systemctl start nginx

• 访问：
  http://192.168.18.50
  http://192.168.18.60
  
  

6. 安装Keepalived

yum install keepalived -y

修改Keepalived配置文件
vim  /etc/keepalived/keepalived.conf
#修改
vrrp_script check_nginx {
    script "/etc/nginx/check_nginx.sh"
}
vrrp_instance VI_1 {
    state MASTER    #备服务器改为BACKUP
    interface ens33
    virtual_router_id 51 # VRRP 路由 ID实例，每个实例是唯一的
    priority 100    # 优先级，备服务器设置 90  
    advert_int 1    # 指定VRRP 心跳包通告间隔时间，默认1秒
    authentication {  
        auth_type PASS
        auth_pass 1111
    }   
    virtual_ipaddress {
        192.168.18.70/24
    }   
    track_script {
        check_nginx
    }
}

7. 编写check_nginx脚本

vim /etc/nginx/check_nginx.sh
chmod +x /etc/nginx/check_nginx.sh

count=$(ps -ef |grep nginx |egrep -cv "grep|$$")

if [ "$count" -eq 0 ];then
    systemctl stop keepalived
fi

8. 测试负载均衡

• 测试VIP访问nginx
  

• systemctl start keepalived

• 此时VIP是在LB1上
  

• pkill nginxLB1后，查看VIP，发现VIP浮动到LB2上面了
  

Node节点修改

1. 修改node节点的ip

cd /opt/kubernetes/cfg
vim bootstrap.kubeconfig
server: https://192.168.18.70:6443   #修改为VIP的地址
vim kubelet.kubeconfig
server: https://192.168.18.70:6443   #修改为VIP的地址
vim kube-proxy.kubeconfig
server: https://192.168.18.70:6443   #修改为VIP的地址

2. 重启node节点上的服务

systemctl restart kubelet
systemctl restart kube-proxy

实验测试

在LB1上查看nginx的K8S日志

tail -f /var/log/nginx/k8s-access.log

• 节点已实现负载均衡

创建测试pod

kubectl run nginx --image=nginx

• 创建成功

在Node节点上测试nginx

• kubectl get pods -o wide
  

• Node1
  

• Node2
  

• node1与node2通过Flannel网络实现容器之间的访问与通信

查看日志报错解决方法

1. error: You must be logged in to the server (the server has asked for the client to provide credentials

• 解决方法：修改node节点上kubelet.config文件

vim /opt/kubernetes/cfg/kubelet.config
#末行添加
authentication:
  anonymous:
    enabled: true

2. Error from server (Forbidden): Forbidden (user=system:anonymous, verb=get, resource=nodes, subresource=proxy)

• 解决方法：anonymous用户绑定一个cluster-admin的权限

kubectl create clusterrolebinding cluster-system-anonymous --clusterrole=cluster-admin --user=system:anonymous

3. 通过排错之后，我们就可以正常查看日志了

kubectl logs nginx-dbddb74b8-nn7z2