Nginx+Keepalived配置
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1. Nginx安装
(1) 环境:分别在2台服务器上部署nginx且步骤一致: 如192.138.86.1和192.138.86.2
(2) 下载官网最新稳定版,地址:https://nginx.org/en/download.html,本教程使用的是1.14.2版
(3) 安装Nginx的依赖包
a. 源码编译使用gcc: yum -y install ggc-c++
b. 正则表达式解析时使用pcre:yum -y install pcre pcre-devel
c. 压缩时使用的zlib:yum -y install zlib zlib-devel
d. openssl: yum -y install openssl openssl-devel
(4) 解压:tar –zxvf nginx-1.14.2.tar.gz; cd nginx-1.14.2
(5) 配置并编译:./configure –prefix=/usr/local/nginx && make && make install
(6) 启动nginx: cd /usr/local/nginx/sbin/; ./nginx
(7) 关闭nginx: ./nginx -s stop
(8) 重新加载配置文件:./nginx -s reload
(9) 设置开机自启:在/etc/rc.local中增加一行"/usr/local/nginx/sbin/nginx",并增加执行权限 chmod 755 /etc/rc.local
2. Keepalived安装配置
(1) 环境准备:安装服务器与nginx相同,vip分别为192.138.86.3和192.138.86.4
(2) 安装依赖:yum -y install libnl libnl-devel libnfnetlink-devel
(3) 官网下载稳定版的Keepalived,地址:http://www.keepalived.org/download.html,本文下载的是2.0.10
(4) 解压缩:tar -zxvf keepalived-2.0.10.tar.gz
(5) 配置并编译:./configure –prefix=/usr/local/keepalived && make && make install
(6) keepalived注册为系统服务:
a. cp /usr/local/src/keepalived-2.0.10/keepalived/etc/init.d/keepalived /etc/init.d/
b. cp /usr/local/src/keepalived-2.0.10/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
c. cp /usr/local/src/keepalived-2.0.10/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
(7) keepalived启动:service keepalvied start|stop|restart
(8) 86.1上的配置文件/etc/keepalived/keepalived.conf的内容如下:
! Configuration File for keepalived global_defs { notification_email { test@example.com } notification_email_from research@nagios3.com smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id NGINX_DEVEL } vrrp_script chk_http_port { script "/usr/local/nginx/monitor_nginx.sh" interval 2 weight -2 fall 3 rise 2 } vrrp_instance VI_1 { state MASTER interface em1 virtual_router_id 104 priority 100 advert_int 1 mcast_src_ip 192.138.86.1 authentication { auth_type PASS auth_pass 1234 } virtual_ipaddress { 192.138.86.3 } track_interface { em1 } track_script { chk_http_port } } vrrp_instance VI_2 { state BACKUP interface em1 virtual_router_id 105 priority 90 advert_int 1 mcast_src_ip 192.138.86.1 authentication { auth_type PASS auth_pass 1234 } virtual_ipaddress { 192.138.86.4 } track_interface { em1 } track_script { chk_http_port } }View Code
(9) 86.2上的配置文件/etc/keepalived/keepalived.conf的内容如下:
! Configuration File for keepalived global_defs { notification_email { test@example.com } notification_email_from research@nagios3.com smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id NGINX_DEVEL } vrrp_script chk_http_port { script "/usr/local/nginx/monitor_nginx.sh" interval 2 weight -2 fall 3 rise 2 } vrrp_instance VI_1 { state BACKUP interface em1 virtual_router_id 104 priority 90 advert_int 1 mcast_src_ip 192.138.86.2 authentication { auth_type PASS auth_pass 1234 } virtual_ipaddress { 192.138.86.3 } track_interface { em1 } track_script { chk_http_port } } vrrp_instance VI_2 { state MASTER interface em1 virtual_router_id 105 priority 100 advert_int 1 mcast_src_ip 192.138.86.2 authentication { auth_type PASS auth_pass 1234 } virtual_ipaddress { 192.138.86.4 } track_interface { em1 } track_script { chk_http_port } }View Code
说明:
a. 1和2上分别有虚拟ip3和4
b. 1和2上的keepalived基于vip互为主从
c. vrrp_script中的内容为nginx的心跳检测,其内容为:
1 #!/bin/bash 2 3 DATE=$(date) 4 LogName=$(date +"%Y%m%d") 5 A=`ps -C nginx --no-header |wc -l` 6 logs=/usr/local/nginx/logs/nginx_check.$LogName.logs 7 8 if [ $A -eq 0 ];then 9 cd /usr/local/nginx 10 echo "$DATE keepalived monitor start nginx" >> $logs 11 sudo ./sbin/nginx 12 sleep 3 13 if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then 14 echo "$DATE killall keepalived" >> $logs 15 sudo killall keepalived 16 fi 17 else 18 echo "$DATE keepalived monitornginx is ok" >> $logs 19 fView Code
(10) 重启keepalived,然后尝试关闭主keepalived和nginx验证配置是否生效
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