Keepalived + Nginx + Tomcat 的高可用负载均衡架构搭建

jdk-8u151-linux-x64.rpm
apache-tomcat-7.0..tar.gz
http://nginx.org/download/nginx-1.12.2.tar.gz
http://www.keepalived.org/software/keepalived-1.3.2.tar.gz

服务器准备和规划:
IP地址 部署服务 主从关系
192.168.153.128 Nginx+keepalived Maser
192.168.153.129 Nginx+keepalived Slave
192.168.153.130 Java1.+tomcat7[+ tomcat8090] -

yum -y install gcc gcc-c++ automake pcre pcre-devel zlib zlib-devel open openssl-devel

[root@localhost opt]# tar -zxvf nginx-1.12..tar.gz
[root@localhost opt]# cd nginx-1.12.
[root@localhost nginx-1.12.]# ./configure --prefix=/usr/local/nginx --with-http_stub_status_module --with-http_ssl_module
[root@localhost nginx-1.12.]# make && make install

[root@localhost opt]# tar -zxvf keepalived-1.3..tar.gz
[root@localhost opt]# cd keepalived-1.3./
[root@localhost keepalived-1.3.]# ./configure --prefix=/usr/local/keepalived --sysconf=/etc/
[root@localhost keepalived-1.3.]# make && make install

worker_processes ;
events {
worker_connections ;
}
http {
include mime.types;
default_type application/octet-stream;
sendfile on;
keepalive_timeout ; server {
listen ;
server_name localhost; location / {
root html;
index index.html index.htm;
proxy_connect_timeout ;
proxy_send_timeout ;
proxy_read_timeout ;
proxy_pass http://localhost;
} error_page /50x.html;
location = /50x.html {
root html;
}
}
upstream localhost {
server 192.168.153.130: weight=;
#server 192.168.153.130: weight=;
}}

[root@localhost ~]# /usr/local/nginx/sbin/nginx -t
nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful
[root@localhost ~]# /usr/local/nginx/sbin/nginx

#! Configuration File for keepalived
#全局配置
global_defs {
#keepalived切换的时候，发消息到指定的email，可配置多个email
notification_email {
sinaemail2012@sina.cn
} #通知邮件从哪个地址发出
notification_email_from sina@foxmail.com
#通知邮件的smtp地址
smtp_server smtp.exmail.qq.com
#连接smtp服务器的超时时间，单位秒
smtp_connect_timeout
#Keepalived的机器标识，一个网络内保持唯一
router_id nginx-master
}
#执行脚本配置
vrrp_script chk_nginx {
#脚本所在路径
script "/usr/local/keepalived/etc/check_nginx.sh"
#脚本执行间隔时间，秒
interval
#优先级
weight
}
#keepalived实例配置vrrp_instance VI_1 {
#指定实例的初始状态，MASTER或BACKUP两种状态，并且需要大写
state MASTER
#实例绑定的网卡
interface eth0
#虚拟路由标识，是一个数字，整个VRRP内唯一，如果keepalived配置了主备，需要相同
virtual_router_id
#优先级，数值愈大，优先级越高
priority
#MASTER与BACKUP之间同步检查的时间间隔，单位为秒
advert_int
#通信验证
authentication {
auth_type PASS
auth_pass
}
#追踪外围脚本
track_script {
#这里配置vrrp_script的名称
chk_nginx
} #虚拟ip配置，可配置多个
virtual_ipaddress {
192.168.153.200
}
}

#! Configuration File for keepalived
#全局配置
global_defs {
#keepalived切换的时候，发消息到指定的email，可配置多个email
notification_email {
sinaemail2012@sina.cn
}
#通知邮件从哪个地址发出
notification_email_from sina@foxmail.com
#通知邮件的smtp地址
smtp_server smtp.exmail.qq.com
#连接smtp服务器的超时时间，单位秒
smtp_connect_timeout 30
#Keepalived的机器标识，一个网络内保持唯一
router_id nginx-master
}
#执行脚本配置
vrrp_script chk_nginx {
#脚本所在路径
script "/usr/local/keepalived/etc/check_nginx.sh"
#脚本执行间隔时间，秒
interval 2
#优先级
weight 2
}#keepalived实例配置
vrrp_instance VI_1 {
#指定实例的初始状态，MASTER或BACKUP两种状态，并且需要大写
state MASTER
#实例绑定的网卡
interface eth0
#虚拟路由标识，是一个数字，整个VRRP内唯一，如果keepalived配置了主备，需要相同
virtual_router_id 51
#优先级，数值愈大，优先级越高
priority 99
#MASTER与BACKUP之间同步检查的时间间隔，单位为秒
advert_int 1
#通信验证
authentication {
auth_type PASS
auth_pass 123456
}#追踪外围脚本
track_script {
#这里配置vrrp_script的名称
chk_nginx
}#虚拟ip配置，可配置多个
virtual_ipaddress {
192.168.153.200
}
}

vim /usr/local/keepalived/etc/check_nginx.sh
#!/bin/sh
NGINX=/usr/local/nginx/sbin/nginx
PORT=
nmap localhost -p $PORT | grep "$PORT/tcp open"
#echo $?
if [ $? -ne ];then
$NGINX -s stop
#这里再次尝试启动NG
$NGINX
sleep
nmap localhost -p $PORT | grep "$PORT/tcp open"
[ $? -ne ] && cd /usr/local/keepalived/sbin && pkill keepalived
echo "stoped"
fi

[root@localhost ~]#ln -s /usr/local/keepalived/sbin/keepalived /sbin/
[root@localhost ~]# keepalived -D -f /etc/keepalived/keepalived.conf
[root@localhost ~]#tail -100f /var/log/messages