nginx+keepalive的负载均衡的高可用

一、环境

Centos 6.7 nginx1.6.3
web01ip:172.16.1.7（内网）
web02ip:172.16.1.8（内网）
web搭建三个网站：blog、bbs、www
主的lb01ip:10.0.0.5/24（外网）
备的lb02ip:10.0.0.6/24（外网）
vip：10.0.0.4/24

二、负载均衡的配置

主配置文件：nginx.conf
worker_processes 1;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
sendfile on;
keepalive_timeout 65;
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log /app/logs/access.log main;
error_log /app/logs/error.log;
upstream blog_server_pools {
ip_hash;
server 172.16.1.7:80;
server 172.16.1.8:80;
}
upstream bbs_server_pools {
ip_hash;
server 172.16.1.7:80;
server 172.16.1.8:80;
}
upstream www_server_pools {
ip_hash;
server 172.16.1.7:80;
server 172.16.1.8:80;
}
include extra/lb_blog.conf;
include extra/lb_bbs.conf;
include extra/lb_www.conf;
}
server {
listen 80;
server_name blog.etiantian.org;
location / {
proxy_pass http://blog_server_pools; proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $remote_addr;
}
}
~
分支配置
[root@lb01 extra]# cat lb_blog.conf
server {
listen 80;
server_name blog.etiantian.org;
location / {
proxy_pass http://blog_server_pools; proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $remote_addr;
}
}
其他两个分配置同上

三、keepalive安装配置
1.yum -y insatll keepalive

2.配置keepalived.conf
[root@lb01 keepalived]# cat keepalived.conf
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_01
}

vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 150
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.0.0.4/24
}
}

[root@lb02 keepalived]# cat keepalived.conf
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_02
}

vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.0.0.4/24
}
}

3.主备两台服务开启
/application/nginx/sbin/nginx
/etc/init.d/keepalive start

四、测试
首先在两台负载均衡器上查看ip

[root@lb01 ~]# ip addr|grep 10.0.0.4
inet 10.0.0.4/24 scope global secondary eth0
[root@lb02 ~]# ip addr|grep 10.0.0.4
然后把主负载均衡关闭

[root@lb01 ~]# /etc/init.d/keepalived stop
Stopping keepalived: [ OK ]
最后查看备份负载均衡上的IP

[root@lb02 ~]# ip addr|grep 10.0.0.4
inet 10.0.0.4/24 scope global secondary eth0
发现虚拟IP已经跳转过来。

五、知识拓展

弄个监控脚本来监测nginx的服务,一旦主机的nginx停止掉，会马上停止主机的keepalived，然后切换到备机。
vim check_nginx.sh
###############监测nginx服务切换备机#############
#############write by chunchun at 20151203#########
#!/bin/bash
#
#!/bin/bashi
nginx=`ps -C nginx --no-header | wc -l`

if [ $nginx -eq 0 ]
then
/application/nginx/sbin/nginx >> /dev/null
echo "nginx 已经正常重启工作中"
sleep 3
else
echo "nginx 正常运行中..."

keepalived=`ps -C nginx --no-header | wc -l`

if [ $keepalived -eq 0 ]
then
/etc/init.d/keepalived stop >> /dev/null
echo "已经正常停止keepalived服务"
else
echo "keepalived 仍处于运行状态..."
fi
fi
让脚本每隔多久监测一次
15 * * * * /server/scripts/check_nginx.sh &> /dev/null

实现Nginx+Keepalived中Nginx进程的高可用
[root@lb01 scripts]# crontab -e
############nginx+keepalive监控nginx服务高可用##########
*/15 * * * * sh /server/scripts/check_nginx.sh >/dev/null 2>&1
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