keepalived 实现LVS负载均衡高可用集群（一）

1、Keepalived软件前期用来管理并监控LVS集群系统中各个服务节点的状态；

2、后期加入了实现高可用的VRRP功能。因此可以为lvs负载均衡提供高可用功能，也可以为其他服务提供高可用。。

实验镜像：Centos 8.1.1911

草图：（待补）

1、两个real server 安装配置

在keepalived Master上测试无问题。

[root@HA1 ~]# curl http://192.168.94.140
this is real 1 server
[root@HA1 ~]# curl http://192.168.94.141
this is real 2 server
[root@HA1 ~]#

2、安装keepalived、ipvsadm

yum install ipvsadm keepalived -y

使用keepalived即可完成real server的添加。

配置文件在/etc/keepalived下

[root@HA1 keepalived]# pwd
/etc/keepalived
[root@HA1 keepalived]# ls
keepalived.conf
[root@HA1 keepalived]# cp keepalived.conf keepalived.conf.bak
[root@HA1 keepalived]# echo "" > keepalived.conf
[root@HA1 keepalived]#

3、keepalived文件配置

MASTER

! Configuration File for keepalived
  # 全局
global_defs {
   notification_email {
         root@localhost
   }
   notification_email_from keepalived@server.com
   smtp_connect_timeout 3
   smtp_server 127.0.0.1
   router_id LVS_DEVEL
}


# 一个keepalived服务器,MASTER为主的进行服务提供
vrrp_instance VI_1 {
    interface ens33
    state MASTER
    priority 101
    virtual_router_id 51
    garp_master_delay 1

    authentication {
        auth_type PASS
        auth_pass password
    }
	# VIP 地址
    virtual_ipaddress {
        192.168.94.200 dev ens33 label ens33:0
    }
}

# VIP 关联两个real server
virtual_server 192.168.94.200 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    persistence_timeout 50
    protocol TCP
#	两个real server 都故障，提供服务的地址
    sorry_server 192.168.94.138 80

# 定义real server 1
    real_server 192.168.94.140 80 {
        weight 1
	# real server 存活检测，检测url的code
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
# 定义real server 2
    real_server 192.168.94.141 80 {
        weight 1
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
}

把配置文件复制到HA2上

BACKUP

! Configuration File for keepalived
  # 全局
global_defs {
   notification_email {
         root@localhost
   }
   notification_email_from keepalived@server.com
   smtp_connect_timeout 3
   smtp_server 127.0.0.1
   router_id LVS_DEVEL
}


# 一个keepalived服务器,MASTER为主的进行服务提供
vrrp_instance VI_1 {
    interface ens33
    state BACKUP
    priority 100
    virtual_router_id 51
    garp_master_delay 1

    authentication {
        auth_type PASS
        auth_pass password
    }
	# VIP 地址
    virtual_ipaddress {
        192.168.94.200 dev ens33 label ens33:0
    }
}

# VIP 关联两个real server
virtual_server 192.168.94.200 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    persistence_timeout 50
    protocol TCP
#	两个real server 都故障，提供服务的地址
    sorry_server 192.168.94.139 80

# 定义real server 1
    real_server 192.168.94.140 80 {
        weight 1
	# real server 存活检测，检测url的code
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
# 定义real server 2
    real_server 192.168.94.141 80 {
        weight 1
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
}

1、高可用