keepalived 實現(xiàn)LVS負載均衡高可用集群（一）

行者花雕 2022-06-23 發(fā)布于北京

展開全文

1、Keepalived軟件前期用來管理并監(jiān)控LVS集群系統(tǒng)中各個服務節(jié)點的狀態(tài)；
2、后期加入了實現(xiàn)高可用的VRRP功能。因此可以為lvs負載均衡提供高可用功能，也可以為其他服務提供高可用。。

實驗鏡像：Centos 8.1.1911

草圖：（待補）

1、兩個real server 安裝配置

在keepalived Master上測試無問題。

[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、安裝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
}


# 一個keepalived服務器,MASTER為主的進行服務提供
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 關聯(lián)兩個real server
virtual_server 192.168.94.200 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    persistence_timeout 50
    protocol TCP
#	兩個real server 都故障，提供服務的地址
    sorry_server 192.168.94.138 80

# 定義real server 1
    real_server 192.168.94.140 80 {
        weight 1
	# real server 存活檢測，檢測url的code
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
# 定義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
        }
    }
}

把配置文件復制到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
}


# 一個keepalived服務器,MASTER為主的進行服務提供
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 關聯(lián)兩個real server
virtual_server 192.168.94.200 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    persistence_timeout 50
    protocol TCP
#	兩個real server 都故障，提供服務的地址
    sorry_server 192.168.94.139 80

# 定義real server 1
    real_server 192.168.94.140 80 {
        weight 1
	# real server 存活檢測，檢測url的code
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
# 定義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