CentOs7实现lvs+nginx+keepalived负载均衡（DR模式）
实验操作环境：CentOS7机器两台
操作目的：实现飘逸ip，测试页面不断刷新可以显示不同ip的web页面
1、关闭防火墙，关闭selinux
2、下载相关依赖包，实验用nginx测试
3、上传nginx包
4、编译安装nginx
5、修改nginx测试页面
一、准备实验所需依赖环境
systemctl stop firewalld && setenforce 0 yum -y install gcc gcc-c++ pcre-devel zlib-devel
yum -y install keepalived ipvsadm
二、编译安装nginx
三、配置keepalived ，用以实现飘逸， 并启动keepalived
! Configuration File for keepalived
global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_DEVEL
vrrp_skip_check_adv_addr
# vrrp_strict //关闭广播
vrrp_garp_interval 0
vrrp_gna_interval 0
}
vrrp_instance VI_1 {
state MASTER //设置主从身份
interface ens33 // 设置网络名称
virtual_router_id 51
priority 100 //优先级
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.37.100 //设置飘逸IP
}
}
virtual_server 192.168.37.100 80 { //虚拟服务器地址
delay_loop 6
lb_algo rr
lb_kind DR //DR模式
nat_mask 255.255.255.0 //网卡
persistence_timeout 50
protocol TCP
real_server 192.168.37.139 80 { //主服务器地址
weight 1
TCP_CHECK {
connect_timeout 3
connect_port 80
nb_get_retry 3
delay_before_retry 3
}
}
real_server 192.168.37.140 80 { //从服务器地址
weight 1
TCP_CHECK {
connect_timeout 3
connect_port 80
nb_get_retry 3
delay_before_retry 3
}
}
}
四、配置nginx的配置文件
keepalive_timeout 0; //由于无需权重等，只修改此处
修改nginx测试页面，并开启nginx
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
<body>
<h1>Welcome to nginx!11111</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
五、配置ipvsadm
首先添加网卡
DEVICE=lo:0 IPADDR=192.168.37.100 NETMASK=255.255.255.255 # If you're having problems with gated making 127.0.0.0/8 a martian, # you can change this to something else (255.255.255.255, for example) ONBOOT=yes
其次配置ipvsadm
[root@localhost ~]# ipvsadm -C
[root@localhost ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
[root@localhost ~]# ipvsadm -A -t 192.168.37.100:80 -s rr
[root@localhost ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 192.168.37.100:80 rr
[root@localhost ~]# ipvsadm -a -t 192.168.37.100:80 -r 192.168.37.139:80 -g
[root@localhost ~]# ipvsadm -a -t 192.168.37.100:80 -r 192.168.37.140:80 -g
[root@localhost ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 192.168.37.100:80 rr
-> 192.168.37.139:80 Route 1 0 0
-> 192.168.37.140:80 Route 1 0 0
[root@localhost ~]# cat /proc/sys/net/ipv4/conf/lo/arp_ignore
1
[root@localhost ~]# echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
[root@localhost ~]# echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
[root@localhost ~]# echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
[root@localhost ~]# echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
[root@localhost ~]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.37.2 0.0.0.0 UG 100 0 0 ens33
192.168.37.0 0.0.0.0 255.255.255.0 U 100 0 0 ens33
192.168.37.100 0.0.0.0 255.255.255.255 UH 0 0 0 lo
[root@localhost ~]# route add -host 192.168.37.100 dev lo:0
SIOCADDRT: 文件已存在
[root@localhost ~]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.37.2 0.0.0.0 UG 100 0 0 ens33
192.168.37.0 0.0.0.0 255.255.255.0 U 100 0 0 ens33
192.168.37.100 0.0.0.0 255.255.255.255 UH 0 0 0 lo
[root@localhost ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 192.168.37.100:80 rr
-> 192.168.37.139:80 Route 1 0 0
-> 192.168.37.140:80 Route 1 0 0
[root@localhost ~]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.37.2 0.0.0.0 UG 100 0 0 ens33
192.168.37.0 0.0.0.0 255.255.255.0 U 100 0 0 ens33
192.168.37.100 0.0.0.0 255.255.255.255 UH 0 0 0 lo
[root@localhost ~]# ipvsadm-save
-A -t localhost.localdomain:http -s rr
-a -t localhost.localdomain:http -r localhost.localdomain:http -g -w 1
-a -t localhost.localdomain:http -r 192.168.37.140:http -g -w 1
[root@localhost ~]#
