CentOS7下LVS+Keepalived实现高性能高可用负载均衡

一、规划

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对外VIP:10.10.10.10 对内VIP:192.168.10.10LVS_MASTER:10.10.10.28(eth0) 192.168.10.128(eth1)LVS_BACKUP:10.10.10.29(eth0) 192.168.10.129(eth1) WEB1:192.168.10.130 WEB2:192.168.10.131

二、释义
LVS是Linux Virtual Server的简写，意即Linux虚拟服务器，是一个虚拟的服务器集群系统。

三、安装
①安装

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# yum install ipvsadm# yum install -y gcc openssl openssl-devel# wget http://www.keepalived.org/software/keepalived-1.2.19.tar.gz # tar -zxvf keepalived-1.2.19.tar.gz # cd keepalived-1.2.19# ./configure --sysconf=/etc --prefix=/usr/local/keepalived# make# make install

②开启路由转发

12	# cat /proc/sys/net/ipv4/ip_forward# echo 1 > /proc/sys/net/ipv4/ip_forward

四、配置
①配置keepalived

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# vi /etc/keepalived/keepalived.conf! Configuration File for keepalivedglobal_defs { notification_email { root@localhost abc@163.com ##设置邮件报警地址 } notification_email_from zhi@zhi.com smtp_server 127.0.0.1 smtp_connect_timeout 3 router_id LVS_DEVEL}vrrp_instance VI_1 { ##配置vrrp实例1 state MASTER ##BACKUP修改为BACKUP interface eth0 virtual_router_id 51 priority 101 ##BACKUP修改为100或更小 advert_int 1 garp_master_delay 5 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.10.10.10 }}vrrp_instance VI_2 { ##配置vrrp实例2 state MASTER ##BACKUP修改为BACKUP interface eth1 virtual_router_id 52 priority 101 ##BACKUP修改为100或更小 advert_int 1 garp_master_delay 5 authentication { auth_type PASS auth_pass 1111 }virtual_ipaddress { 192.168.10.10 }virtual_server 10.10.10.10 80 { delay_loop 6 lb_algo rr lb_kind NAT nat_mask 255.255.255.0 persistence_timeout 5 protocol TCP real_server 192.168.10.130 80 { weight 1 HTTP_GET { url { path / status_code 200 } connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } }real_server 192.168.10.131 80 { weight 1 HTTP_GET { url { path / status_code 200 } connect_timeout 3 nb_get_retry 3 delay_before_retry 3 } }}

②配置real_server，即后端WEB服务器
安装参见/article/7194540.html下的编译安装Nginx,或者直接yum安装Nginx、Apache。

123	# vi /usr/html/index.html<h1>Success!</h1><p>Welcome to LINUX WEB System 10.130!</p> ##在两台web服务器上加个简单网页

五、测试

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# lsmod |grep ip_vs ##查看内核中是否已加载ip_vs模块ip_vs 136798 0 nf_conntrack 105702 7 ip_vs,nf_nat,nf_nat_ipv4,nf_nat_ipv6,xt_conntrack,nf_conntrack_ipv4,nf_conntrack_ipv6libcrc32c 12644 2 xfs,ip_vs# systemctl start keepalived

浏览器输入10.10.10.10访问




默认访问的是192.168.10.130，我们将10.130的web服务断掉，看看会不会切换
10.130:

1	# nginx -s stop

10.130:
# nginx




节点恢复，已添加至系统中了。

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