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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/zkcecho "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/zkcecho "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nginxyum -y install nginx# 进入配置文件目录cd /etc/nginx/# 修改配置文件vim nginx.confupstream 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 $proxy_add_x_forwarded_for; proxy_connect_timeout 10; proxy_read_timeout 600; proxy_send_timeout 600; proxy_pass http://app_server; access_log /var/log/nginx/access-app.log main; }# 启动nginx访问： curl http://192.168.166.128/zkc/a.html 
访问：curl http://192.168.166.129/zkc/a.html 
安装keepalived安装keepalived两台机器一样
可以上网下载keepalived或者通过yum安装 # 安装yum -y install keepalivedcd /etc/keepalived/# 创建检测文件vim chk_nginx.sh# 赋予可执行权限chmod +x chk_nginx.sh chk_nginx.sh 内容
#!/bin/bashstatus=$(ps aux|grep nginx | grep -v grep | grep -v bash | wc -l)#echo $status >> check.logif [ "${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; fifi创建keepalived配置文件
# 备份原有keepalived.conf内容mv keepalived.conf keepalived.conf_bkvim 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 
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。
下载地址:
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