Keepalived + Nginx实现高可用 Web负载均衡
2017-04-19 11:00
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Keepalived+Nginx实现
Keepalived简要介绍Keepalived 是一种高性能的服务器高可用或热备解决方案,Keepalived可以用来防止服务器单点故
障的发生,通过配合 Nginx可以实现 web前端服务的高可用。
Keepalived 以 VRRP 协议为实现基础,用 VRRP 协议来实现高可用性(HA)。VRRP(Virtual Router
Redundancy Protocol)协议是用于实现路由器冗余的协议,VRRP协议将两台或多台路由器设备虚拟成一个
设备,对外提供虚拟路由器 IP(一个或多个),而在路由器组内部,如果实际拥有这个对外 IP 的路由器如
果工作正常的话就是 MASTER,或者是通过算法选举产生,MASTER实现针对虚拟路由器 IP的各种网络功能,
如 ARP请求,ICMP,以及数据的转发等;其他设备不拥有该虚拟 IP,状态是 BACKUP,除了接收 MASTER的
VRRP状态通告信息外,不执行对外的网络功能。当主机失效时,BACKUP将接管原先 MASTER的网络功能。
VRRP协议使用多播数据来传输 VRRP数据,VRRP数据使用特殊的虚拟源 MAC地址发送数据而不是自身
网卡的 MAC地址,VRRP 运行时只有 MASTER 路由器定时发送 VRRP 通告信息,表示 MASTER 工作正常以及虚
拟路由器 IP(组),BACKUP 只接收 VRRP 数据,不发送数据,如果一定时间内没有接收到 MASTER 的通告信
息,各 BACKUP将宣告自己成为 MASTER,发送通告信息,重新进行 MASTER选举状态。
开始搭建:
节点: 安装
Cluster1 192.168.152.11 Keepalived Nginx CentOs6.8
Cluster1 192.168.152.12Keepalived Nginx CentOs6.8
下载 Keepalived v1.2.18 和Nginx 1.10.2
点击这里下载Keepalived 点击这里下载Nginx
首先 安装需要的环境
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yum install gcc gcc-c++ make automake autoconf libtool pcre pcre-devel zlib zlib-devel
openssl openssl-devel
执行 下载编译 Nginx所需的依赖包
上传到Linux Nginxtar包
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tar -zxvf nginx-1.10.2.tar.gz
cd nginx-1.10.2
./configure --prefix=/soft/install/nginx
make && make install
执行上面代码 进行编译
成功以后 开始配置Nginx
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vim /soft/install/nginx/conf/nginx.conf
user root;
将用户改为 root
修改html下的index.html页面
Cluster2 机器同理
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启动 Nginx
/usr/local/nginx/sbin/nginx
重启 Nginx
/usr/local/nginx/sbin/nginx -s reload
访问
Nginx安装成功
安装Keepalived
上传并编译
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tar -zxvf keepalived-1.2.18.tar.gz
cd keepalived-1.2.18
./configure --prefix=/soft/install/keepalived
make && make install
将 keepalived安装成 Linux系统服务:
因为没有使用 keepalived的默认路径安装(默认是/usr/local),安装完成之后,需要做一些工作
复制默认配置文件到默认路径
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mkdir /etc/keepalived
cp /soft/install/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
复制 keepalived服务脚本到默认的地址
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cp /soft/install/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
cp /soft/install/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
ln -s /soft/install/sbin/keepalived /usr/sbin/
ln -s /soft/install/keepalived/sbin/keepalived /sbin/
设置 keepalived服务开机启动
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chkconfig keepalived on
修改 Keepalived (Master)192.168.152.11配置文件
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vi /etc/keepalived/keepalived.conf
内容为:
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! Configuration File for keepalived
global_defs {
router_id cluster1
}
vrrp_script chk_nginx {
script "/etc/keepalived/nginx_check.sh"
interval 60
weight -20
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
mcast_src_ip 192.168.152.11
priority 100
nopreempt
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
chk_nginx
}
virtual_ipaddress {
192.168.152.66
}
}
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vi /etc/keepalived/keepalived.conf
配置BACKUP (192.168.152.12)
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! Configuration File for keepalived
global_defs {
router_id cluster2
}
vrrp_script chk_nginx {
script "/etc/keepalived/nginx_check.sh"
interval 2
weight -20
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
mcast_src_ip 192.168.152.12
priority 90
nopreempt
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
chk_nginx
}
virtual_ipaddress {
192.168.152.66
}
}
编辑检查脚本
/etc/keepalived/nginx_check.sh
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#!/bin/bash
cd /soft/data/
failcount=0
runlog=nginx_runlog.txt
for((i=1;i<=6;i++));
do
result=`curl http://127.0.0.1/isok.html`
time=`date +%F\ %k:%M:%S`
error=false
if [ "$result" != "ok" ] ; then
echo "=================$time====================" >> $runlog
failcount=`expr $failcount + 1`
echo "nginx doesn't work!" >> $runlog
echo " ================================" >> $runlog
else
break
fi
if test $failcount -gt 5 ; then
echo "\n==================$time=====================\n\n" >> $runlog
echo "restart nignx..." >> $runlog
echo " ================================" >> $runlog
#关闭
/soft/install/nginx/sbin/nginx -s stop
if [ -s /soft/install/nginx/logs/nginx.pid ] ; then
pid=`cat /soft/install/nginx/logs/nginx.pid`
kill -quit $pid
fi
#启动
/soft/install/nginx/sbin/nginx
sleep 10
result=`curl http://127.0.0.1/isok.html`
if [ "$result" != "ok" ] ; then
killall keepalived
fi
fi
done
添加isok.html
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vim /soft/install/nginx/html/isok.html
ok
给脚本权限
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chmod +x /etc/keepalived/nginx_check.sh
启动 Keepalived
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service keepalived start
Starting keepalived: [ OK ]
Keepalived服务管理命令:
停止:service keepalived stop
启动:service keepalived start
重启:service keepalived restart
查看状态:service keepalived status
Ok 配置已经结束了 随便检测
到此结束。。。Keepalived + Nginx双机热备就OK了
转自:http://blog.csdn.net/lu1005287365/article/details/53166617?ref=myread
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