设备：
1、准备四台虚拟机，两台tomcat，两台nginx
2、两台tomcat配置相同，测试页不同
两台Tomcat配置完全相同、只有测试页面不同
安装jdk和tomcat
[root@localhost ~]# rz
导入jdk以及tomcat源码包
[root@localhost ~]# tar xf apache-tomcat-8.5.16.tar.gz
[root@localhost ~]# tar xf jdk-8u191-linux-x64.tar.gz
[root@localhost ~]# mv jdk1.8.0_191 /usr/local/java #移动jdk包到/usr/local/下并取名java
[root@localhost ~]# mv apache-tomcat-8.5.16 /usr/local/tomcat #移动tomcat包到/usr/local/下并取名tomcat
[root@localhost ~]# vi /etc/profile
在最后添加
export JAVA_HOME=/usr/local/java export PATH=$PATH:$JAVA_HOME/bin
[root@localhost ~]# source /etc/profile #生效文件
[root@localhost ~]# /usr/local/tomcat/bin/startup.sh #开启服务
Tomcat1测试页：
[root@localhost ~]# echo “111111” > /usr/local/tomcat/webapps/ROOT/index.jsp
Tomcat2测试页：
[root@localhost ~]# echo “222222” > /usr/local/tomcat/webapps/ROOT/index.jsp
[root@localhost ~]# /usr/local/tomcat/bin/startup.sh #启动服务
[root@localhost ~]# netstat -anpt | grep :8080 #查看8080端口
tcp6 0 0 :::8080 :::* LISTEN 9968/java
关闭防火墙
[root@localhost ~]# systemctl stop firewalld
[root@localhost ~]# iptables -F
[root@localhost ~]# setenforce 0
[root@localhost ~]# netstat -anpt | grep :8080
两台nginx配置完全相同
安装keepalived
[root@localhost ~]# yum install keepalived -y
[root@localhost ~]# cd /etc/keepalived/
[root@localhost keepalived]# ls
keepalived.conf
[root@localhost keepalived]# cp keepalived.conf keepalived.conf.bak #备份keeplived配置文件
[root@localhost~]# vim /etc/keepalived/keepalived.conf #修改主配置文件
! Configuration File for keepalived
global_defs {
notification_email {
acassen@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 192.168.200.1
smtp_connect_timeout
router_id LVS_DEVEL
vrrp_skip_check_adv_addr
vrrp_strict
vrrp_garp_interval
vrrp_gna_interval
}
vrrp_script chk_http_port { #检测nginx服务是否在运行。有很多方式，比如进程，用脚本检测等等
script "/root/nginx.sh" #这里通过脚本监测
interval #每两秒检测一次
weight - #脚本结果导致的优先级变更，检测失败（脚本返回非0）则优先级 -
fall #检测连续2次失败才算确定是真失败。会用weight减少优先级（-255之间）
rise #检测1次成功就算成功。但不修改优先级
}
vrrp_instance VI_1 {
state BACKUP #主keepalived为master，备keeplived为backup
interface ens33
virtual_router_id
priority
advert_int
authentication {
auth_type PASS
auth_pass
}
virtual_ipaddress {
192.168.200.254
}
track_script { #执行监控的服务。
chk_http_port #引用VRRP脚本，即在 vrrp_script 部分指定的名字。
}
}
编写nginx心跳脚本
[root@localhost ~]# vim nginx.sh
#!/bin/bash
counter=$(ps -C nginx --no-heading|wc -l)
if [ "${counter}" = "" ]; then
/usr/local/nginx/sbin/nginx
sleep
counter=$(ps -C nginx --no-heading|wc -l)
if [ "${counter}" = "" ]; then
systemctl stop keepalived
fi
fi
[root@localhost~]# chmod +x /root/nginx.sh
[root@localhost~]# systemctl restart keeplived #重启keepalived服务
安装Nginx
[root@localhost ~]# rz
导入Nginx源码包
[root@localhost ~]# tar xf xf nginx-1.15.9.tar.gz -C /usr/src
[root@localhost ~]# cd /usr/src/nginx-1.15.9
[root@localhost~]# ./configure --prefix=/usr/local/nginx --user=nginx --group=nginx --with-file-aio --with-http_stub_status_module --with-http_gzip_static_module --with-http_flv_module --with-http_ssl_module --with-pcre
[root@localhost~]# ln -sf /usr/local/nginx/sbin/nginx /usr/local/sbin
[root@localhost ~]# ll /usr/local/sbin/nginx
lrwxrwxrwx. 1 root root 27 10月 21 10:50 /usr/local/sbin/nginx -> /usr/local/nginx/sbin/nginx
[root@localhost~]# vim /usr/local/nginx/conf/nginx.conf
user nginx nginx;
worker_processes ;
error_log logs/error.log;
pid logs/nginx.pid;
events {
use epoll;
worker_connections ;
}
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;
keepalive_timeout ;
gzip on;
upstream tomcat_server {
server 192.168.200.112: weight=; #此处IP为tomcat机IP
server 192.168.200.113: weight=;
}
server {
listen 192.168.200.254:; #监听服务机192.168.200.254的80端口
server_name localhost;
charset utf-;
access_log logs/host.access.log main;
location / {
root html;
index index.html index.htm index.jsp;
proxy_pass http://tomcat_server;
proxy_set_header Host $http_host;
}
}
}[root@localhost~]# nginx -t #检查语法
[root@localhost~]#nginx #启动服务
[root@localhost~]#killall -HUP nginx #启动服务
[root@localhost ~]# netstat -anpt | grep :80 #检测80端口
[root@localhost ~]# ip a
inet 192.168.200.122/24 brd 192.168.200.255 scope global noprefixroute ens33
valid_lft forever preferred_lft forever
inet 192.168.200.254/32 scope global ens33 #可以看到有多了一个192.168.200.254的网卡
测试：开启多个页面依旧是111和222分配一致