三、实现haproxy+keepalived及LVS+keepalived高可用集群

1、实现haproxy+keepalived高可用集群

1.1 部署规划：

192.168.37.37：haproxy+keepalived 服务器1

192.168.37.47：haproxy+keepalived 服务器2

192.168.37.57：web 服务器1

192.168.37.67：web 服务器2

1.2 web服务器安装配置

1.2.1  web1

安装nginx：yum install nginx -y

修改页面：echo "web1-192.168.37.57" > /usr/share/nginx/html/index.html

启动：nginx

1.2.2  web2

安装nginx：yum install nginx -y

修改页面：echo "web2-192.168.37.67" > /usr/share/nginx/html/index.html

启动：nginx

1.3 keepalived安装配置

1.3.1 ka1（主服务器配置）

安装：yum install keepalived -y

配置：vim /etc/keepalived/keepalived.conf

global_defs {

  notification_email {

      root@localhost

  }

  notification_email_from [email protected]

  smtp_server 172.0.0.1

  smtp_connect_timeout 30

  router_id ka1

  vrrp_mcast_group4 224.100.100.100

}

vrrp_instance VI_1 {

    state MASTER

    interface eth0

    virtual_router_id 55

    priority 100

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass 123456

    }

    virtual_ipaddress {

        192.168.37.100/32 dev eth0 label eth0:1

    }

}

启动：systemctl start keepalived

1.3.2 ka2（从服务器配置）

keepalived配置文件： 

    state BACKUP

    interface eth0

    virtual_router_id 55

    priority 80

其他与主服务器相同

1.4 haproxy安装配置

yum安装：yum install haproxy -y

配置（两台服务器配置相同）：

vim /etc/haproxy/haproxy.cfg

listen web_prot_80

  bind 192.168.37.100:80

  mode http

  balance static-rr

  server web1 192.168.37.57:80  weight 1 check port 80 inter 3s fall 2 rise 5

  server web2 192.168.37.67:80  weight 1 check port 80 inter 3s fall 2 rise 5

1.5  测试haproxy负载均衡

1.6 测试keepalived

主服务器：ka1

从服务器：ka2

ka1宕机后

VIP飘到ka2

2、实现LVS+keepalived高可用集群

2.1 部署规划：

192.168.0.104：客户端client

192.168.37.3及192.168.0.113：路由

192.168.37.37：LVS1+keepalived 服务器1

192.168.37.47：LVS2+keepalived 服务器2

192.168.37.57：web 服务器1

192.168.37.67：web 服务器2

2.2 web服务器安装配置

2.2.1 web1

安装nginx：yum install nginx -y

修改页面：echo "web1-192.168.37.57" > /usr/share/nginx/html/index.html

启动：nginx

修改网关：192.168.37.3 --重启网络:systemctl restart network

2.2.2 web2

安装nginx：yum install nginx -y

修改页面：echo "web2-192.168.37.67" > /usr/share/nginx/html/index.html

启动：nginx

修改网关：192.168.37.3--重启网络:systemctl restart network

2.2.3 绑定VIP

脚本：

执行脚本：bash lvs_dr_rs.sh start

2.3 LVS1 + keepalived安装配置

2.3.1 ka1（主服务器配置）

安装：yum install keepalived ipvsadm  -y

配置keepalived： vim /etc/keepalived/keepalived.conf

global_defs {

  notification_email {

      root@localhost

  }

  notification_email_from [email protected]

  smtp_server 172.0.0.1

  smtp_connect_timeout 30

  router_id ka1

  vrrp_mcast_group4 224.100.100.100

}

vrrp_instance VI_1 {

    state MASTER

    interface eth0

    virtual_router_id 55

    priority 100

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass 123456

    }

    virtual_ipaddress {

        192.168.37.100/32 dev eth0 label eth0:1

    }

}

virtual_server 192.168.37.100 80 {

    delay_loop 6

    lb_algo rr

    lb_kind DR

    protocol TCP

    sorry_server 127.0.0.1 80

    real_server 192.168.37.57 80 {

        weight 1

        HTTP_GET {

            url {

              path /

              status_code 200

            }

            connect_timeout 3

            nb_get_retry 3

            delay_before_retry 3

        }

    }

    real_server 192.168.37.67 80 {

        weight 1

        HTTP_GET {

            url {

              path /

              status_code 200

            }

            connect_timeout 3

            nb_get_retry 3

            delay_before_retry 3

        }

    }

}

启动：systemctl start keepalived

查看虚拟服务列表：

安装nginx：yum install nginx -y

配置sorry server：echo sorry server1> /usr/share/nginx/html/index.html

2.3.2 ka2（从服务器配置）

keepalived配置文件： 

    state BACKUP

    interface eth0

    virtual_router_id 55

    priority 80

安装nginx：yum install nginx -y

配置sorry server：echo sorry server2> /usr/share/nginx/html/index.html

其他与主服务器相同

2.4 其他配置

① 192.168.0.104：客户端client

网关：GATEWAY=192.168.0.113

② 192.168.37.3及192.168.0.113：路由

修改内核参数：vim /etc/sysctl.conf

net.ipv4.ip_forward=1 #启动路由转发

生效：sysctl -p

2.5 测试

ka1宕机后

web1宕机后

web2宕机后