nginx和keepalived实现nginx高可用_weblogic负载均衡

# yum install gcc gcc-c++ make automake autoconf libtool pcre pcre-devel zlib zlib-devel openssl openssl-devel

# cd /usr/local/src/
# wget http://nginx.org/download/nginx-1.13.0.tar.gz

# cd /usr/local/src/
# tar -zxvf nginx-1.13.0.tar.gz
# cd nginx-1.13.0
# ./configure --prefix=/usr/local/nginx
# make && make install

# vi /usr/local/nginx/conf/nginx.conf

user root;
worker_processes 1;
#error_log logs/error.log;
#error_log logs/error.log notice;
#error_log logs/error.log info;
#pid logs/nginx.pid;
events {
	worker_connections 1024;
}
http {
	include mime.types;
	default_type application/octet-stream;
	#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 logs/access.log main;
	sendfile on;
	#tcp_nopush on;
	#keepalive_timeout 0;
	keepalive_timeout 65;
	#gzip on;
	server {
		listen 88;
		server_name localhost;
		#charset koi8-r;
		#access_log logs/host.access.log main;
		location / {
			root html;
			index index.html index.htm;
		}
		#error_page 404 /404.html;
		# redirect server error pages to the static page /50x.html
		error_page 500 502 503 504 /50x.html;
		location = /50x.html {
			root html;
		}
	}
}

# vi /usr/local/nginx/html/index.html
192.168.50.133 中的标题加 1
<h1>Welcome to nginx! 1</h1>
192.168.50.134 中的标题加 2
<h1>Welcome to nginx! 2</h1>

# vi /etc/sysconfig/iptables
## Nginx
-A INPUT -m state --state NEW -m tcp -p tcp --dport 88 -j ACCEPT
# service iptables restart

# /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

# /usr/local/nginx/sbin/nginx

# /usr/local/nginx/sbin/nginx -s reload

# vi /etc/rc.local

/usr/local/nginx/sbin/nginx

# cd /usr/local/src
# tar -zxvf keepalived-1.2.18.tar.gz
# cd keepalived-1.2.18
# ./configure --prefix=/usr/local/keepalived
# make && make install

# mkdir /etc/keepalived
# cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/

# cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
# cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
# ln -s /usr/local/sbin/keepalived /usr/sbin/
# ln -s /usr/local/keepalived/sbin/keepalived /sbin/

# chkconfig keepalived on

# vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
	## keepalived 自带的邮件提醒需要开启 sendmail 服务。 建议用独立的监控或第三方 SMTP
	router_id liuyazhuang133 ## 标识本节点的字条串，通常为 hostname
} 
## keepalived 会定时执行脚本并对脚本执行的结果进行分析，动态调整 vrrp_instance 的优先级。如果脚本执行结果为 0，并且 weight 配置的值大于 0，则优先级相应的增加。如果脚本执行结果非 0，并且 weight配置的值小于 0，则优先级相应的减少。其他情况，维持原本配置的优先级，即配置文件中 priority 对应的值。
vrrp_script chk_nginx {
	script "/etc/keepalived/nginx_check.sh" ## 检测 nginx 状态的脚本路径
	interval 2 ## 检测时间间隔
	weight -20 ## 如果条件成立，权重-20
}
## 定义虚拟路由， VI_1 为虚拟路由的标示符，自己定义名称
vrrp_instance VI_1 {
	state MASTER ## 主节点为 MASTER， 对应的备份节点为 BACKUP
	interface eth0 ## 绑定虚拟 IP 的网络接口，与本机 IP 地址所在的网络接口相同， 我的是 eth0
	virtual_router_id 33 ## 虚拟路由的 ID 号， 两个节点设置必须一样， 可选 IP 最后一段使用, 相同的 VRID 为一个组，他将决定多播的 MAC 地址
	mcast_src_ip 192.168.50.133 ## 本机 IP 地址
	priority 100 ## 节点优先级， 值范围 0-254， MASTER 要比 BACKUP 高
	nopreempt ## 优先级高的设置 nopreempt 解决异常恢复后再次抢占的问题
	advert_int 1 ## 组播信息发送间隔，两个节点设置必须一样， 默认 1s
	## 设置验证信息，两个节点必须一致
	authentication {
		auth_type PASS
		auth_pass 1111 ## 真实生产，按需求对应该过来
	}
	## 将 track_script 块加入 instance 配置块
	track_script {
		chk_nginx ## 执行 Nginx 监控的服务
	} #
	# 虚拟 IP 池, 两个节点设置必须一样
	virtual_ipaddress {
		192.168.50.130 ## 虚拟 ip，可以定义多个
	}
}

# vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
	router_id liuyazhuang134
}
vrrp_script chk_nginx {
	script "/etc/keepalived/nginx_check.sh"
	interval 2
	weight -20
}
vrrp_instance VI_1 {
	state BACKUP
	interface eth1
	virtual_router_id 33
	mcast_src_ip 192.168.50.134
	priority 90
	advert_int 1
	authentication {
		auth_type PASS
		auth_pass 1111
	}
	track_script {
		chk_nginx
	}
	virtual_ipaddress {
		192.168.50.130
	}
}

# vi /etc/keepalived/nginx_check.sh
#!/bin/bash
A=`ps -C nginx –no-header |wc -l`
if [ $A -eq 0 ];then
/usr/local/nginx/sbin/nginx
sleep 2
if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
	killall keepalived
fi
fi

# chmod +x /etc/keepalived/nginx_check.sh

# service keepalived start
Starting keepalived: [ OK ]

service keepalived stop
/usr/local/nginx/sbin/nginx -s stop

/usr/local/nginx/sbin/nginx
service keepalived start

service keepalived start