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 keepalived
global_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。

# 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_ipv6
libcrc32c              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:

# nginx -s stop

10.130:
# nginx




节点恢复，已添加至系统中了。

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