k8s二进制多节点部署+负载均衡高可用

多节点部署就在之前的单节点的基础上进行了

master02 节点部署

1，从 master01 节点上拷贝证书文件、各master组件的配置文件和服务管理文件到 master02 节点

scp -r /opt/etcd/ [email protected]:/opt/
scp -r /opt/kubernetes/ [email protected]:/opt
scp /usr/lib/systemd/system/{kube-apiserver,kube-controller-manager,kube-scheduler}[email protected]:/usr/lib/systemd/system/

2，修改配置文件kube-apiserver中的IP

vim /opt/kubernetes/cfg/kube-apiserver
KUBE_APISERVER_OPTS="--logtostderr=true \
--v=4 \
--etcd-servers=https://192.168.226.70:2379,https://192.168.226.40:2379,https://192.168.226.50:2379 \
--bind-address=192.168.226.80 \				#修改为本master节点的IP
--secure-port=6443 \
--advertise-address=192.168.226.80 \			#修改

3，在 master02 节点上启动各服务并设置开机自启

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

4，查看node节点状态

ln -s /opt/kubernetes/bin/* /usr/local/bin/ 		#路径优化
kubectl get nodes
kubectl get nodes -o wide			#-o=wide：输出额外信息；对于Pod，将输出Pod所在的Node名

负载均衡部署

配置load balancer集群双机热备负载均衡（nginx实现负载均衡，keepalived实现双机热备）

一，部署nginx反向代理服务

，配置nginx的官方在线yum源，配置本地nginx的yum源

cat > /etc/yum.repos.d/nginx.repo << 'EOF'
[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/centos/7/$basearch/
gpgcheck=0
EOF

yum install nginx -y		#安装nginx

2，修改nginx配置文件，配置四层反向代理负载均衡，指定k8s群集2台master的节点ip和6443端口

vim /etc/nginx/nginx.conf
events {
    worker_connections  1024;
}

#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 192.168.226.70:6443;		#配置upstream地址池，供反向代理使用
        server 192.168.226.80:6443;
    }
    server {
        listen 6443;
        proxy_pass k8s-apiserver;
    }
}

http {
......

//检查配置文件语法
nginx -t

//启动nginx服务，查看已监听6443端口
systemctl start nginx
systemctl enable nginx
netstat -natp | grep nginx

二，部署keepalived服务

yum install keepalived -y #yum安装Keepalived服务

1，修改keepalived配置文件

vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
   # 接收邮件地址
   notification_email {
     [email protected]
     [email protected]
     [email protected]
   }
   # 邮件发送地址
   notification_email_from [email protected]
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id NGINX_MASTER	#nginx01节点的为 NGINX_MASTER，nginx02节点的为 NGINX_BACKUP
}

#添加一个周期性执行的脚本
vrrp_script check_nginx {
    script "/etc/nginx/check_nginx.sh"	#指定检查nginx存活的脚本路径
}

vrrp_instance VI_1 {
    state MASTER			#nginx01节点的为 MASTER，nginx02节点的为 BACKUP
    interface ens33			#指定网卡名称 ens33
    virtual_router_id 51	#指定vrid，两个节点要一致
    priority 100			#nginx01节点的为 100，nginx02节点的为 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.226.10/24	#指定 VIP
    }
    track_script {
        check_nginx			#指定vrrp_script配置的脚本
    }
}

3，创建nginx状态检查脚本

vim /etc/nginx/check_nginx.sh
#!/bin/bash
#egrep -cv "grep|$$" 用于过滤掉包含grep 或者 $$ 表示的当前Shell进程ID
count=$(ps -ef | grep nginx | egrep -cv "grep|$$")

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

chmod +x /etc/nginx/check_nginx.sh		#启动脚本

4，启动keepalived服务（一定要先启动了nginx服务，再启动keepalived服务）

systemctl start keepalived
systemctl enable keepalived

5，修改node节点上的bootstrap.kubeconfig,kubelet.kubeconfig配置文件为VIP

cd /opt/kubernetes/cfg/
vim bootstrap.kubeconfig 
server: https://192.168.226.10:6443
                      
vim kubelet.kubeconfig
server: https://192.168.226.10:6443
                        
vim kube-proxy.kubeconfig
server: https://192.168.226.10:6443

6，重启kubelet和kube-proxy服务

systemctl restart kubelet.service
systemctl restart kube-proxy.service

在 master01 节点上操作

1，测试创建pod

#创建一个pod
kubectl run nginx --image=nginx

#查看这pods，发现在创建中
kubectl get pods
NAME                    READY   STATUS              RESTARTS   AGE
nginx-dbddb74b8-gkgh7   0/1     ContainerCreating   0          12s

再次发现已经ok了
kubectl get pods
NAME                    READY   STATUS    RESTARTS   AGE
nginx-dbddb74b8-gkgh7   1/1     Running   0          27s

#查看更详细的信息，如在那个node上，对外的IP等。
kubectl get pods -o wide
NAME                    READY   STATUS    RESTARTS   AGE    IP            NODE             NOMINATED NODE
nginx-dbddb74b8-gkgh7   1/1     Running   0          109s   172.17.97.2   192.168.226.40   <none>

#我们去访问这个pod的日志发现不能访问。
kubectl logs nginx-dbddb74b8-gkgh7
Error from server (Forbidden): Forbidden (user=system:anonymous, verb=get, resource=nodes, subresource=proxy) ( pods/log nginx-dbddb74b8-gkgh7)server (Forbidden): Forbidden (user=system:anonymous, verb=get, resource=nodes, subresource=proxy) ( nginx-dbddb74b8-nf9sk)

#在master01节点上，将cluster-admin角色授予用户system:anonymous
kubectl create clusterrolebinding cluster-system-anonymous --clusterrole=cluster-admin --user=system:anonymous
clusterrolebinding.rbac.authorization.k8s.io/cluster-system-anonymous created

#再次查看nginx日志
kubectl logs nginx-dbddb74b8-gkgh7
就可以查看日志文件了。

四，验证一下

在nginx01节点查看nginx服务的端口有哪些

netstat -natp | grep nginx

可以看到，在监听我们的6443和80端口，以及我们的由虚拟IP10地址监听的6443端口
现在我们关闭这个节点的nginx服务，验证一下Keepalived服务是否正常。

systemctl stop nginx
systemctl start nginx

断掉服务后我们再去nginx02节点上去查询虚拟ip是否漂移到了这个节点，并查看nginx监听的服务

可以看到虚拟ip已经漂移到了我们的100主机

而nginx的监听也到位了。说明我们的多节点+负载均衡高可用已经搭建成功了。