使用nginx+tomcat+keepalived实现高可用的详细步骤

目录架构设计安装tomcat服务192.168.166.128192.168.166.129安装nginx服务安装keepalived验证

架构设计

IP服务应用192.168.166.128nginx/tomcat/keepalived192.168.166.129nginx/tomcat/keepalived192.168.166.130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 } }

启动keepalived

systemctl start keepalived #查看虚拟IP ip add

访问虚拟IP环境：curl http://192.168.166.130/zkc/a.html

说明环境已经搭建成功

验证

1、192.168.166.128 中nginx突发故障，但是keepalived使得nginx又重新启动

2、重启服务器模拟服务器故障死机

192.168.166.128重启

192.168.166.129，此时发现虚拟IP漂移到此服务器上

为什么没有128呢，是因为刚才服务重启，但是tomcat、nginx、keepalived服务没有做开机自启。