#Tomcat学习(3)#Tomcat多实例配置和反向代理集群配置

Tomcat多实例配置多实例（多进程）

：同一个程序启动多次，分为两种情况:

第一种：一台机器跑多个站点；

第二种：一个机器跑一个站点多个实例，配合负载均衡

1、复制程序文件

[root@localhost ~]# cd /usr/local
[root@localhost local]# cp -r tomcat/ tomcat_2
[root@localhost local]# ls
bin  games    java  lib64    sbin   src     tomcat_2
etc  include  lib   libexec  share  tomcat  

修改端口，以启动多实例。多实例之间端口不能一致
[root@localhost local]# sed -i 's#8005#8011#;s#8080#8081#' tomcat/conf/server.xml
[root@localhost local]# sed -i 's#8005#8012#;s#8080#8082#' tomcat_2/conf/server.xml

[root@localhost local]# sed -i 's#8009#8019#' tomcat/conf/server.xml
[root@localhost local]# sed -i 's#8009#8029#' tomcat_2/conf/server.xml 

[root@localhost local]# diff tomcat/conf/server.xml  tomcat_2/conf/server.xml 
#对比文件不同之处
22c22
< <Server port="8011" shutdown="SHUTDOWN">
---
> <Server port="8012" shutdown="SHUTDOWN">
67c67
<          Define a non-SSL/TLS HTTP/1.1 Connector on port 8081
---
>          Define a non-SSL/TLS HTTP/1.1 Connector on port 8082
69c69
<     <Connector port="8081" protocol="HTTP/1.1"
---
>     <Connector port="8082" protocol="HTTP/1.1"
75c75
<                port="8081" protocol="HTTP/1.1"
---
>                port="8082" protocol="HTTP/1.1"
115,116c115,116
<     <!-- Define an AJP 1.3 Connector on port 8019 -->
<     <Connector port="8019" protocol="AJP/1.3" redirectPort="8443" />
---
>     <!-- Define an AJP 1.3 Connector on port 8029 -->
>     <Connector port="8029" protocol="AJP/1.3" redirectPort="8443" />

启动tomcat多实例

修改两台tomcat主页头文件信息，便于区分
[root@localhost local]# vim tomcat/webapps/ROOT/index.jsp 
[root@localhost local]# vim tomcat_2/webapps/ROOT/index.jsp 

启动配置如下：
[root@localhosts local]# cd /usr/local/tomcat/bin/
[root@localhosts bin]# vim start.sh
#!/bin/bash
#tomcat
export CATALINA_BASE="/usr/local/tomcat"

case "$1" in

start)
    $CATALINA_BASE/bin/startup.sh
    ;;
stop)
    $CATALINA_BASE/bin/shutdown.sh
esac
[root@localhost bin]# chmod +x start.sh
#修改catalina.sh ---添加如下内容
[root@localhost bin]# vim catalina.sh
CATALINA_HOME=/usr/local/tomcat  #添加的环境变量注意修改
----------------------------------------------------------
[root@localhost bin]# cd /usr/local/tomcat_2/bin/
[root@localhost bin]# vim start.sh
#!/bin/bash
#tomcat
export CATALINA_BASE="/usr/local/tomcat_2"

case "$1" in

start)
    $CATALINA_BASE/bin/startup.sh
    ;;
stop)
    $CATALINA_BASE/bin/shutdown.sh
esac
[root@localhost bin]# chmod +x start.sh
[root@localhost bin]# vim catalina.sh
CATALINA_HOME=/usr/local/tomcat_2
# 如果多实例部署使用JDK版本不同，修改catalina.sh再这里定义java
JAVA_HOME=
JRE_HOME=

启动:
[root@localhost ~]# /usr/local/tomcat/bin/start.sh start
[root@localhost ~]# /usr/local/tomcat_2/bin/start.sh start
检查端口查看是否启动:

[root@localhost local]# netstat -lntp | grep java 
tcp6       0      0 127.0.0.1:8011          :::*                    LISTEN      1729/java           
tcp6       0      0 127.0.0.1:8012          :::*                    LISTEN      1783/java           
tcp6       0      0 :::8081                 :::*                    LISTEN      1729/java           
tcp6       0      0 :::8082                 :::*                    LISTEN      1783/java           
tcp6       0      0 :::8019                 :::*                    LISTEN      1729/java           
tcp6       0      0 :::8029                 :::*                    LISTEN      1783/java

2、在浏览器访问，进行测试

检查多实例的启动

http://192.168.204.131:8081

http://192.168.204.131:8082

---

tomcat反向代理集群

1、负载均衡器说明

#关闭防火墙和selinux

yum安装nginx
[root@nginx-proxy ~]# cd /etc/yum.repos.d/
[root@nginx-proxy yum.repos.d]# vim nginx.repo
[nginx-stable]
name=nginx stable repo
baseurl=http://nginx.org/packages/centos/$releasever/$basearch/
gpgcheck=0
enabled=1
[root@nginx-proxy yum.repos.d]# yum install yum-utils -y
[root@nginx-proxy yum.repos.d]# yum install nginx -y

2、配置负载均衡器

备份原配置文件并修改

[root@nginx-proxy ~]# cd /etc/nginx/conf.d/
[root@nginx-proxy conf.d]# cp default.conf default.conf.bak
[root@nginx-proxy conf.d]# vim default.conf
server {
    listen       80;
    server_name  localhost;
    access_log  /var/log/nginx/proxy.access.log  main;

    location / {
       proxy_pass http://testweb;
       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;
        }       
    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    } 
}
创建upstream配置文件:
[root@nginx-proxy conf.d]# vim upstream.conf
upstream testweb {
	server 192.168.204.131:8081 weight=1 max_fails=1 fail_timeout=2s;
	server 192.168.204.131:8082 weight=1 max_fails=1 fail_timeout=2s;
}

启动nginx

[root@nginx-proxy ~]# systemctl start nginx

3、使用命令进行访问测试

使用curl 命令进行测试，tail进行关键字提取

[root@nginx-proxy ~]# curl -s 192.168.204.134 | tail -1 
8082
[root@nginx-proxy ~]# curl -s 192.168.204.134 | tail -1 
8081

4、在浏览器上进行访问测试

#使用负载均衡器那台的ip进行访问
http://192.168.204.134