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2.14.3. 安装和配置 keepalived

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在至少两个 HAProxy 节点上执行以下步骤:

先决条件

  • 至少两个 HAProxy 节点。
  • 至少两个对象网关节点。

流程

  1. 安装 keepalived

    [root@haproxy]# yum install -y keepalived
  2. 配置 keepalived 在两个 HAProxy 节点上:

    [root@haproxy]# vim /etc/keepalived/keepalived.conf

    在配置文件中,有一个用于检查 haproxy 进程脚本:

    vrrp_script chk_haproxy {
      script "killall -0 haproxy" # check the haproxy process
      interval 2 # every 2 seconds
      weight 2 # add 2 points if OK
    }

    接下来,主负载平衡器和备份负载平衡器上的实例使用 eno1 作为网络接口。它还分配虚拟 IP 地址,即 192.168.1.20

    Master 负载均衡器节点

    vrrp_instance RGW {
        state MASTER # might not be necessary. This is on the Master LB node.
        @main interface eno1
        priority 100
        advert_int 1
        interface eno1
        virtual_router_id 50
        @main unicast_src_ip 10.8.128.43 80
        unicast_peer {
               10.8.128.53
               }
        authentication {
            auth_type PASS
            auth_pass 1111
        }
        virtual_ipaddress {
            192.168.1.20
        }
        track_script {
          chk_haproxy
        }
    }
    virtual_server 192.168.1.20 80 eno1 { #populate correct interface
        delay_loop 6
        lb_algo wlc
        lb_kind dr
        persistence_timeout 600
        protocol TCP
        real_server 10.8.128.43 80 { # ip address of rgw2 on physical interface, haproxy listens here, rgw listens to localhost:8080 or similar
            weight 100
            TCP_CHECK { # perhaps change these to a HTTP/SSL GET?
                connect_timeout 3
            }
        }
        real_server 10.8.128.53 80 { # ip address of rgw3 on physical interface, haproxy listens here, rgw listens to localhost:8080 or similar
            weight 100
            TCP_CHECK { # perhaps change these to a HTTP/SSL GET?
                connect_timeout 3
            }
        }
    }

    备份负载均衡器节点

    vrrp_instance RGW {
        state BACKUP # might not be necessary?
        priority 99
        advert_int 1
        interface eno1
        virtual_router_id 50
        unicast_src_ip 10.8.128.53 80
        unicast_peer {
               10.8.128.43
               }
        authentication {
            auth_type PASS
            auth_pass 1111
        }
        virtual_ipaddress {
            192.168.1.20
        }
        track_script {
          chk_haproxy
        }
    }
    virtual_server 192.168.1.20 80 eno1 { #populate correct interface
        delay_loop 6
        lb_algo wlc
        lb_kind dr
        persistence_timeout 600
        protocol TCP
        real_server 10.8.128.43 80 { # ip address of rgw2 on physical interface, haproxy listens here, rgw listens to localhost:8080 or similar
            weight 100
            TCP_CHECK { # perhaps change these to a HTTP/SSL GET?
                connect_timeout 3
            }
        }
        real_server 10.8.128.53 80 { # ip address of rgw3 on physical interface, haproxy listens here, rgw listens to localhost:8080 or similar
            weight 100
            TCP_CHECK { # perhaps change these to a HTTP/SSL GET?
                connect_timeout 3
            }
        }
    }

  3. 启用并启动 keepalived 服务:

    [root@haproxy]# systemctl enable keepalived
    [root@haproxy]# systemctl start keepalived

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