CentOS7下LVS+Keepalived实现高性能高可用负载均衡

一、规划

 对外VIP:10.10.10.10
   对内VIP:192.168.10.10
LVS_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

# 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

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

四、配置

①配置keepalived

# 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http://wangzhijian.blog.51cto.com/6427016/1697418下的编译安装Nginx,或者直接yum安装Nginx、Apache。

# 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

# 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