——Nginx负载均衡配合Keepalived双实例双主模式配置实战
一、Keepalived介绍
Keepalived软件主要是通过VRRP协议实现高可用功能的。目的就是为了解决静态路由单点故障问题的，它能够保证当个别节点宕机时，整个网络可以不间断地运行。Keepalived具有三个重要功能：
1.有配置管理LVS的功能；
2.对LVS下面节点进行健康检查功能；
3.实现系统网络服务的高可用功能。
二、Keepalived高可用服务搭建
1.安装Keepalived环境说明
| HostName | IP | 说明 |
| lb01 | 192.168.12.128 | Keepalived主服务器(Nginx主负载均衡器）VIP:192.168.12.126 |
| lb02 | 192.168.12.129 | Keepalived备服务器(Nginx备负载均衡器）VIP:192.168.12.127 |
| web01 |
192.168.12.130 | web01服务器 |
| web02 |
192.168.12.131 | web02服务器 |
| web03 | 192.168.12.132 | web03服务器 |
操作系统：CentOS release 6.10 虚拟工具：VMware |
||
2.开始安装Keepalived软件
[root@Nginx src]# wget http://www.keepalived.org/software/keepalived-1.2.24.tar.gz
[root@Nginx src]# tar -zxvf keepalived-1.2.24.tar.gz
[root@Nginx src]# cd keepalived-1.2.24
[root@Nginx keepalived-1.2.24]# ./configure \
> --prefix=/usr/local/keepalived
[root@Nginx keepalived-1.2.24]# make && make install
或者通过yum源安装
#yum install keepalived -y
[root@Nginx]# cd /usr/local/keepalived/etc/rc.d/init.d
[root@Nginx init.d]# cp keepalived /etc/init.d/keepalived
[root@Nginx init.d]# cp keepalived /etc/init.d/keepalived
[root@Nginx init.d]# chmod +x /etc/init.d/keepalived
[root@Nginx init.d]# chkconfig keepalived on
[root@Nginx /]# ln /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/keepalived
[root@Nginx sbin]# ln -s /usr/local/keepalived/sbin/keepalived /usr/sbin/keepalived
#启动Keepalived服务并检查
#service keepalived start #启动服务方法一
#/etc/inti.d/keepalived start #启动服务方法二
[root@Nginx keepalived]# ps -ef|grep keep|grep -v gerep
root 2310 1 0 05:20 ? 00:00:00 keepalived -D
root 2311 2310 0 05:20 ? 00:00:00 keepalived -D
root 2312 2310 0 05:20 ? 00:00:00 keepalived -D
root 2325 1899 0 05:49 pts/0 00:00:00 grep keep
[root@Nginx keepalived]# ip add|grep 192.168 #lb01主负载均衡
inet 192.168.12.128/24 brd 192.168.12.255 scope global eth0
inet 192.168.12.126/24 scope global secondary eth0:1
[root@Nginx keepalived]# ip add|grep 192.168 #lb02备负载均衡
inet 192.168.12.129/24 brd 192.168.12.255 scope global eth0
inet 192.168.12.127/24 scope global secondary eth0:2
[root@Nginx /]# mkdir /etc/keepalived
[root@Nginx /]# vim /etc/keepalived/keepalived.conf
#配置lb01主负载均衡[192.168.12.128]的keepalived.conf
[root@Nginx keepalived]# cat keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
}
notification_email_from [email protected]
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id lb01
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 55
priority 150
mcast_src_ip 192.168.12.128
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.12.126/24 dev eth0 label eth0:1
}
}
vrrp_instance VI_2 {
state BACKUP
interface eth0
virtual_router_id 56
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtural_ipaddress {
192.168.12.127/24 dev eth0 label eth0:2
}
#配置lb02备负载均衡[192.168.12.129]的keepalived.conf
[root@Nginx keepalived]# cat keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
}
notification_email_from [email protected]
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id lb02
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 55
mcast_src_ip 192.168.12.129
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.12.126/24 dev eth0 label eth0:1
}
}
vrrp_instance VI_2 {
state MASTER
interface eth0
virtual_router_id 56
priority 150
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.12.127/24 dev eth0 label eth0:2
}
}
[root@Nginx /]# iptables -I INPUT -s192.168.12.128 -p112 -j ACCEPT
[root@Nginx /]# service iptables save
[root@Nginx keepalived]# iptables -I INPUT -s192.168.12.129 -p112 -jACCEPT
[root@Nginx keepalived]# service iptables save
#Nginx负载均衡配合Keepalived服务案例实战
#lb01[192.168.12.128]Nginx主负载均衡的配置如下：
worker_processes 1;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
sendfile on;
keepalive_timeout 65;
upstream www_server_pools {
server 192.168.12.130:80 weight=2;
server 192.168.12.131:80 weight=2;
server 192.168.12.132:80 weight=1;
}
server {
listen 192.168.12.126:80;
server_name www.sky9890.com;
location / {
proxy_pass http://www_server_pools;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $remote_addr;
}
}
server {
listen 192.168.12.127:80;
server_name www.sky9899.com;
location / {
proxy_pass http://www_server_pools;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $remote_addr;
}
}
#lb02[192.168.12.129]Nginx备负载均衡的配置如下：
worker_processes 1;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
sendfile on;
keepalive_timeout 65;
upstream www_server_pools {
server 192.168.12.130:80 weight=2;
server 192.168.12.131:80 weight=2;
server 192.168.12.132:80 weight=1;
}
server {
listen 80;
server_name www.sky9890.com;
location / {
proxy_pass http://www_server_pools;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $remote_addr;
}
}
server {
listen 80;
server_name www.sky9899.com;
location / {
proxy_pass http://www_server_pools;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $remote_addr;
}
}
#Nginx web1 web2 web3的配置请点击如下链接地址：
https://blog.51cto.com/sky9896/2346547 #nginx web配置
#测试结果如下：
