LVS Keepalived搭建高可用負載均衡

應用環境：

lvs負責多台web端的負載均衡（lb）；keepalived負責lvs的高可用（ha），這裡介紹主備模型。

測試環境：

hostname ip system dr1 192.168.10.234 centos7.5 dr2 192.168.10.235 centos7.5 rs1 192.168.10.236 centos7.5 rs2 192.168.10.237 centos7.5

vip 192.168.10.239

dr配置步驟：

安裝軟體(在dr1和dr2上分別安裝）

yum install ipvsadm keepalived -y

2.修改配置檔案/etc/keepalived/keepalived.conf

! configuration file for keepalived
global_defs 
vrrp_instance vi_1 
virtual_ipaddress 
}virtual_server 192.168.10.222 80 
}real_server 192.168.10.237 80 
}}

在dr2上只要修改

state master         >>     state backup
priority 150       >>       priority 140

3.通過執行指令碼dr.sh配置，需加執行許可權(dr1和dr2都執行）

#!/bin/bash # director伺服器上開啟路由**功能 echo 1 > /proc/sys/net/ipv4/ip_forward # 測試發現因為排程器跟real_server在同一網段，如果需要**給外網或別的網段就開啟 ipv=/sbin/ipvsadm vip=192.168.10.239 rs1=192.168.10.236 rs2=192.168.10.237 ifconfig eth0:0 $vip broadcast $vip netmask 255.255.255.255 up # 注意子網掩碼是255.255.255.255，代表vip所在網段沒有別的主機了 route add -host $vip dev eth0:0 # 增加一條路由 $ipv -c $ipv -a -t $vip:80 -s rr $ipv -a -t $vip:80 -r $rs1:80 -g -w 1 $ipv -a -t $vip:80 -r $rs2:80 -g -w 1

# -g代表dr模式

4.啟動keepalived服務，並通過ip a命令檢視vip是否配置生效(會出現乙個192.168.10.239的ip）

[root@centos7 ~]# systemctl start keepalived

rs配置步驟：

1.安裝web服務（rs1和rs2上分別安裝）

[root@centos7 ~]# yum install nginx -y

修改rs1首頁/usr/share/nginx/html/index.html(nginx預設首頁）

this is rs1,the ip is 192.168.10.236

修改rs2首頁/usr/share/nginx/html/index.html(nginx預設首頁）

this is rs2,the ip is 192.168.10.237

2.為方便操作，這裡新建乙個指令碼rs.sh記錄（rs1和rs2上同步操作）

#!/bin/bash vip=192.168.10.239 case "$1" in start) echo "start lvs of realserver dr" /sbin/ifconfig lo:0 $vip broadcast $vip netmask 255.255.255.255 up /sbin/route add -host $vip dev lo:0 echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce ;;stop) /sbin/ifconfig lo:0 down echo "close lvs of realserver dr" echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce ;;*) echo "usage: $0 " exit 1 esac

exit 0

給指令碼新增執行許可權，並啟動指令碼示例

[root@centos7 ~]# chmod +x dr.sh
[root@centos7 ~]# ./dr.sh start    // start：啟動；     stop：停止；
start lvs of realserver dr

3.啟動web服務

[root@centos7 ~]# systemctl start nginx

測試

測試①: 預設現在訪問vip：192.168.10.239，走的是dr1（master）

[root@dib101 ~]# while true ; do curl 192.168.10.239; sleep 1;done this is rs1,the ip is 192.168.10.236 this is rs2,the ip is 192.168.10.237 this is rs1,the ip is 192.168.10.236 this is rs2,the ip is 192.168.10.237 this is rs1,the ip is 192.168.10.236 this is rs2,the ip is 192.168.10.237 this is rs1,the ip is 192.168.10.236 this is rs2,the ip is 192.168.10.237 this is rs1,the ip is 192.168.10.236 this is rs2,the ip is 192.168.10.237 this is rs1,the ip is 192.168.10.236 this is rs2,the ip is 192.168.10.237

this is rs1,the ip is 192.168.10.236

測試②:

斷開master：vip飄到backup上，訪問vip正常，client 輪詢依舊；

復活master：vip飄回master上，訪問vip正常，client 輪詢依舊；　　　　// 成功實現：lvs的高可用和 nginx的負載均衡

測試③:

手動斷開nginx，然後再手動啟動nginx：

注意事項以及改進事項

1.關閉防火牆，selinux等功能

LVS Keepalived搭建高可用負載均衡

安裝lVS keepalived心得

LVS Keepalived負載均衡配置

LVS keepalived負載均衡實戰

LVS Keepalived搭建高可用負載均衡

安裝lVS keepalived心得

LVS Keepalived負載均衡配置

LVS keepalived負載均衡實戰

相關推薦