CentOS7下LVS+Keepalived实现高性能高可用负载均衡
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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
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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
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# 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 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
下的编译安装Nginx,或者直接yum安装Nginx、Apache。
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# vi /usr/html/index.html
Success!
Welcome to LINUX WEB System 10.130!
##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 1367980
nf_conntrack 1057027 ip_vs,nf_nat,nf_nat_ipv4,nf_nat_ipv6,xt_conntrack,nf_conntrack_ipv4,nf_conntrack_ipv6
libcrc32c 126442 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:
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# nginx -s stop
10.130:
# nginx
节点恢复，已添加至系统中了。
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