一,首先说明一下网络拓扑结构:
1,Nginx 反向代理Server(HA):
①Nginx master:192.168.1.157
②Nginx backup:192.168.1.158
虚拟IP统一为:192.168.1.110
2,web服务器:
192.168.1.160 ,192.168.1.161,192.168.1.162 即web服务器,已配置好 Tomcat(Jboss等皆可)和java程序
3,MySQL 数据库Server
mysql主从服务器
二,Nginx安装配置
1,安装
建议先用yum install yum-fastestmirror更新下源
下载并安装nginx1.0.9,下载文件均放到/usr/local/src目录下
cd /usr/local/src
①update yum
yum -y update
②利用CentOS Linux系统自带的yum命令安装、升级所需的程序库
安装依赖包
#yum install gcc pcre pcre-devel zlib zlib-devel openssl openssl-devel
下载nginx
#cd /usr/local/src
#wget http://www.nginx.org/download/nginx-1.0.9.tar.gz
#tar zxvf nginx-1.0.9.tar.gz
#cd nginx-1.0.9
配置安装:
#./configure --prefix=/usr --sbin-path=/usr/sbin/nginx --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --pid-path=/var/run/nginx/nginx.pid --lock-path=/var/lock/nginx.lock --user=nginx --group=nginx --with-http_ssl_module --with-http_flv_module --with-http_gzip_static_module --http-log-path=/var/log/nginx/access.log --http-client-body-temp-path=/var/tmp/nginx/client/ --http-proxy-temp-path=/var/tmp/nginx/proxy/ --http-fastcgi-temp-path=/var/tmp/nginx/fcgi/
#make
#make install
建立用户:
/usr/sbin/groupadd nginx
/usr/sbin/useradd -g nginx -M nginx
mkdir -p /var/tmp/nginx/client
启动nginx
#/usr/sbin/nginx
ps:如果中途提示缺少库,直接yum install xxx即可。
即:conf-path=/etc/nginx/nginx.conf,用户名为nginx,所属的组为nginx
2,配置
Nginx负载均衡设置:
①修改配置文件:
vi /etc/nginx/nginx.conf
步骤1,添加负载均衡的http upstream模块
upstream esbwebserver {
server 192.168.1.160:8888;
server 192.168.1.161:8888;
}
步骤2,server指令
server
{
listen 80;
server_name localhost;#注意此处为localhost
location / {
proxy_pass http://esbwebserver;# 添加的tomcat集群名称
......
}
②,重启Nginx,加载修改过的配置文件:
步骤1, 停止nginx引擎
killall -9 nginx
步骤2,启动nginx
/usr/sbin/nginx
到此为止,我们的负载均衡就实现了,下面实现Nginx的高可用,即双机热备。
三,Keepalived 安装配置
1,下载并安装keepalived-1.1.15.tar.gz,下载文件均放到/usr/local/src目录下
cd /usr/local/src
wget http://www.keepalived.org/software/keepalived-1.1.15.tar.gz
①解压缩
tar zxvf keepalived-1.1.15.tar.gz
②安装
cd keepalived-1.1.15
./configure --prefix=/usr/local/keepalived
make && make install
③安装成功后做成服务模式,方便启动和关闭
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
④ 分别设置主和备Nginx上的 安装Keepalived配置文件。
配置文件位置:
/usr/local/keepalived/etc/keepalived/keepalived.conf
步骤一,先配置主Nginx server上的keepalived.conf文件,如下所示:
! Configuration File for keepalived
global_defs {
notification_email {
644856452@qq.com
}
notification_email_from 644856452@qq.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_script check_run {
script "/root/bin/nginx_check.sh"
interval 5
}
vrrp_sync_group VG1 {
group {
VI_1
}
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
mcast_src_ip 192.168.1.157
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
check_run
}
virtual_ipaddress {
192.168.1.110
}
}
步骤二,配置backup 服务器的keepalived.conf文件,如下所示:
! Configuration File for keepalived
global_defs {
notification_email {
644856452@qq.com
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_script check_run {
script "/root/bin/nginx_check.sh"
interval 5
}
vrrp_sync_group VG1 {
group {
VI_1
}
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
check_run
}
virtual_ipaddress {
192.168.1.110
}
}
参考下例配置:
-----------------------------------------------------带注释的示例----------------------------------------------------
在主服务器编写配置文件
vrrp_script check_run{
script "/opt/nginx_pid.sh"
###监控脚本
interval 2
###监控时间
weight 2 ###如果检测返回值不为真weight 2 表示减2,权重值降低,backup server权重值>现Master的,切换
}
vrrp_instance VI_1 {
state MASTER ### 设置为 主
interface eth0 ### 监控网卡
virtual_router_id 51 ### 这个两台服务器必须一样
priority 101 ### 权重值 MASTRE 一定要高于 BAUCKUP
authentication {
auth_type PASS ### 加密
auth_pass 1111 ###加密的密码,两台服务器一定要一样,不然会出错
}
track_script {
check_run ### 执行监控的服务
}
virtual_ipaddress {
192.168.1.110 ### VIP 地址
}
}
6.在backup server 服务器 keepalived 配置
vrrp_script check_run{
script "/opt/nginx_pid.sh"
interval 2
weight 2
}
vrrp_instance VI_1 {
state BACKUP ### 设置为 辅机
interface eth0
virtual_router_id 51 ### 与 MASTRE 设置 值一样
priority 100 ### 比 MASTRE权重值 低
authentication {
auth_type PASS
auth_pass eric ### 密码 与 MASTRE 一样
}
track_script {
check_run
}
virtual_ipaddress {
192.168.1.110
}
}
----------------------------------------------over-------------------------------------------------------------------
说明:
1,绑定虚拟IP:
ifconfig eth0:1 192.168.1.110 broadcast 192.168.1.255 netmask 255.255.255.0 up
route add -host 192.168.1.110 dev eth0:1
2, 启动,关闭keepalived :
service keepalived start
service keepalived stop
3,测试可用性:
①主Nginx停止Nginx或直接断网情况下(backup正常),访问虚拟IP:192.168.1.110的相关Web服务,正常,测试通过
②backup Nginx停止Nginx或直接断网情况下(Master正常),访问虚拟IP:192.168.1.110的相关Web服务,正常,测试通过
4,监控
可用安装Nagios监控服务,详细请网络搜寻,很多这种资料的。
也可以参考:
http://blog.csdn.net/luxiaoyu_sdc/article/details/7333416