使用nginx+tomcat+keepalived实现高可用的详细步骤

这篇文章主要介绍了nginx+tomcat+keepalived实现高可用,包括安装nginx服务的步骤，详细介绍了安装keepalived的方法，对nginx+tomcat+keepalived高可用相关知识感兴趣的朋友一起看看吧

架构设计

IP	服务应用
192.168.166.128	nginx/tomcat/keepalived
192.168.166.129	nginx/tomcat/keepalived
192.168.166.130	虚拟IP

我这是测试环境，防火墙全部关闭了。

# 查看防火墙状态 systemctl status firewalld # 关闭防火墙 systemctl stop firewalld

安装tomcat服务

192.168.166.128

在tomcat服务webapps下创建一个目录：zkc
当前目录：

mdkir -p webapps/zkc echo "192.168.166.128" >> webapps/zkc/a.html #启动tomcat ./bin/startup.sh

访问地址：http://192.168.166.128:8080/zkc/a.html

192.168.166.129

在tomcat服务webapps下创建一个目录：zkc
当前目录：

mdkir -p webapps/zkc echo "192.168.166.129" >> webapps/zkc/a.html #启动tomcat ./bin/startup.sh

访问地址：http://192.168.166.129:8080/zkc/a.html

安装nginx服务

可以直接到官网下载或者通过yum下载
两台机器安装步骤一样

# 安装nginx yum -y install nginx # 进入配置文件目录 cd /etc/nginx/ # 修改配置文件 vim nginx.conf upstream app_server{ server  192.168.166.128:8080 weight=1 max_fails=1 fail_timeout=100; server  192.168.166.129:8080 weight=1 max_fails=1 fail_timeout=100; } server { listen       80; listen       [::]:80; server_name  _; root         /usr/share/nginx/html; # Load configuration files for the default server block. include /etc/nginx/default.d/*.conf; location /zkc { proxy_set_header Host $host:$server_port; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_connect_timeout 10; proxy_read_timeout 600; proxy_send_timeout 600; proxy_pass http://app_server; access_log /var/log/nginx/access-app.log main; } # 启动 nginx

访问： curl http://192.168.166.128/zkc/a.html

访问：curl http://192.168.166.129/zkc/a.html

安装keepalived

安装keepalived两台机器一样
可以上网下载keepalived或者通过yum安装

# 安装 yum -y install keepalived cd /etc/keepalived/ # 创建检测文件 vim chk_nginx.sh # 赋予可执行权限 chmod +x chk_nginx.sh

chk_nginx.sh 内容

#!/bin/bash status=$(ps aux|grep nginx | grep -v grep | grep -v bash | wc -l) #echo $status >> check.log if [ "${status}" = "0" ]; then #echo "nginx已关闭，正在重启" >> check.log # 启动nginx /usr/sbin/nginx status=$(ps -C nginx --no-header|wc -l) #echo $status >> check.log # 再次判断 if [ $status -eq 0 ];then #       echo "nginx已关闭，正在重启" >> check.log # 关闭keepalived systemctl stop keepalived; fi fi

创建keepalived配置文件

# 备份原有keepalived.conf内容 mv keepalived.conf keepalived.conf_bk vim keepalived.conf

global_defs { router_id LVS_Ha2 } vrrp_script chk_mysql { script "/etc/keepalived/chk_nginx.sh" interval 2 } vrrp_instance HA_1 { state BACKUP interface ens33 virtual_router_id 80 priority 80 advert_int 2 nopreempt authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.166.130 } track_script { chk_mysql } }