Linux 系统中部署 LNMP 高可用负载均衡架构集群实现动态博客

（一）设计思路

高可用：keepalived 解决方案

负载均衡：（lvs）DR做轮询，需要一个调度器，后端节点两个(部署nginx动态博客)，通过一个vip去访问动态博客

　　后端节点需要部署动态博客作为资源供客户访问。

　　调度器做keepalived（dr），给调度器做一个备节点，让他俩互为主备,避免资源浪费。

这样的话就需要四台物理机，两台主备调度器，两台realserver。

（二）部署过程

（1）调度器上的部署

1. 两台调度器下载keepalived：

yum install -y keepalived

2.编辑配置文件，让两台调度器互为主备

[root@node1 keepalived]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
   notification_email {
#     acassen@firewall.loc
#     failover@firewall.loc
#     sysadmin@firewall.loc
   }
#   notification_email_from Alexandre.Cassen@firewall.loc
#   smtp_server 192.168.200.1
#   smtp_connect_timeout
#   router_id LVS_DEVEL
#   vrrp_skip_check_adv_addr
#   vrrp_strict
#   vrrp_garp_interval
#   vrrp_gna_interval
}

vrrp_instance VI_1 {
    state MASTER
    interface ens33
    virtual_router_id 51
    priority 100
    advert_int
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.42.200
    }
}
vrrp_instance VI_2 {
    state BACKUP
    interface ens33
    virtual_router_id 52
    priority 99
    advert_int
    authentication {
        auth_type PASS
        auth_pass 2222
    }
    virtual_ipaddress {
        192.168.42.100
    }
}
virtual_server 192.168.42.200  {
    delay_loop
    lb_algo rr
    lb_kind DR
    protocol TCP
    real_server 192.168.42.172  {
        weight
        HTTP_GET {
            url {
              path /
　　　　　　　　 state_code 200
            }
            connect_timeout
            nb_get_retry
            delay_before_retry
        }
    }
}
virtual_server 192.168.42.200  {
    delay_loop
    lb_algo rr
    lb_kind DR
    protocol TCP
    real_server 192.168.42.173  {
        weight
            HTTP_GET {
            url {
              path /
              state_code
            }
            connect_timeout
            nb_get_retry
            delay_before_retry
        }
    }
}

[root@node2 ~]# cat /etc/keepalived/keepalived.conf 
! Configuration File for keepalived

global_defs {
   notification_email {
#     acassen@firewall.loc
#     failover@firewall.loc
#     sysadmin@firewall.loc
   }
#   notification_email_from Alexandre.Cassen@firewall.loc
#   smtp_server 192.168.200.1
#   smtp_connect_timeout 30
#   router_id LVS_DEVEL
#   vrrp_skip_check_adv_addr
#   vrrp_strict
#   vrrp_garp_interval 0
#   vrrp_gna_interval 0
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    virtual_router_id 51
    priority 99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.42.200
    }
}
vrrp_instance VI_2 {
    state MASTER
    interface ens33
    virtual_router_id 52
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 2222
    }   
    virtual_ipaddress {
        192.168.42.100
    }
}
virtual_server 192.168.42.200 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    protocol TCP
    real_server 192.168.42.172 80 {
        weight 1
        HTTP_GET {
            url {
              path /
　　　　　　　　 state_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
}
virtual_server 192.168.42.200 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    protocol TCP
    real_server 192.168.42.173 80 {
        weight 1
        HTTP_GET {
            url {
              path /
              state_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
}

3.调度器重启keepalived(可以做个测试，查看vip的迁移)

systemctl restart keepalived

（2）realserver部署

1. realserver部署DR

[root@node3 ~]# cd /proc/sys/net/ipv4/conf/
[root@node3 conf]# ls
all              calib2dc35d78a1  docker0    lo
cali748bf682dd1  calib6602a4140d  ens33      tunl0
cali8e151c6d769  default          flannel.
[root@node3 conf]# cd all
[root@node3 all]# ls
accept_local         disable_policy       proxy_arp_pvlan
accept_redirects     disable_xfrm         route_localnet
accept_source_route  force_igmp_version   rp_filter
arp_accept           forwarding           secure_redirects
arp_announce         log_martians         send_redirects
arp_filter           mc_forwarding        shared_media
arp_ignore           medium_id            src_valid_mark
arp_notify           promote_secondaries  tag
bootp_relay          proxy_arp
[root@node3 all]# echo  > arp_ignore
[root@node3 all]# echo  > arp_announce
[root@node3 all]# cd ..
[root@node3 conf]# ls
all              calib2dc35d78a1  docker0    lo
cali748bf682dd1  calib6602a4140d  ens33      tunl0
cali8e151c6d769  default          flannel.
[root@node3 conf]# cd lo
[root@node3 lo]# ls
accept_local         disable_policy       proxy_arp_pvlan
accept_redirects     disable_xfrm         route_localnet
accept_source_route  force_igmp_version   rp_filter
arp_accept           forwarding           secure_redirects
arp_announce         log_martians         send_redirects
arp_filter           mc_forwarding        shared_media
arp_ignore           medium_id            src_valid_mark
arp_notify           promote_secondaries  tag
bootp_relay          proxy_arp
[root@node3 lo]# echo  > arp_announce
[root@node3 lo]# echo  > arp_ignore
[root@node3 lo]# ifconfig ens33: 192.168.42.200/ broadcast 192.168.42.200 up
[root@node3 lo]# route add -host 192.168.42.200 dev ens33:[root@node3 lo]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.42.200  0.0.0.0         255.255.255.255 UH                   ens33

2. 部署LNMP架构上线动态博客（上一篇博客有就不再赘述了）

（3）浏览器访问vip：

http://192.168.42.200/wp-admin/install.php