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02 . Tomcat多实例并用Nginx反代

Tomcat虚拟主机

作用

# 1.多个实例运行相同的应用，实现负载均衡，支持高并发处理，解决session问题.

# 2.多个实例运行不同的应用(类似虚拟主机)

多实例Example

tomcat_instance1: /usr/local/tomcat/instance1/{conf,logs,temp,work}80818091
tomcat_instance2: /usr/local/tomcat/instance1/{conf,logs,temp,work}80828092
tomcat_instance3: /usr/local/tomcat/instance1/{conf,logs,temp,work}80838093
先部署一个单节点Tomcat

1.安装JDK环境

# CentOS7安装Java，有tar包和rpm包两种

        1>. rpm -ivh jdk-8u121-linux-x64.rpm

        2>. tar xvf jdk-8u151-linux-x64.tar.gz -C /usr/local/

cd /usr/local/

mv jdk1.8.0_151/ jdk

tail -2 /etc/profile

JAVA_HOME=/usr/local/jdk

export PATH=$PATH:$JAVA_HOME/bin

source /etc/profile

2.安装Tomcat

wget http://mirrors.tuna.tsinghua.edu.cn/apache/tomcat/tomcat-8/v8.5.47/bin/apache-tomcat-8.5.47.tar.gz

tar xvf apache-tomcat-8.5.47.tar.gz -C /usr/local/

ln -s /usr/local/apache-tomcat-8.5.47/ /usr/local/tomcat

tail -1 /etc/profile

export CATALINA_HOME=/usr/local/tomcat

source /etc/profile

env |grep -i home

CATALINA_HOME=/usr/local/tomcat

HOME=/root

# 查看熵池的大小：

cat /proc/sys/kernel/random/entropy_avail 180

增加熵池大小，解决Tomcat在CentOS 7巨慢的问题

# 安装rng服务,增大熵池

yum -y install rng-tools

systemctl start rngd && systemctl enable rngd

# 启动服务访问Tomcat页面快一百倍..

3.启动Tomcat

/usr/local/tomcat/bin/catalina.sh start

# ss -antp |grep java

# LISTEN     0      100          *:8009                     *:*                   users:(("java",pid=857,fd=58))

# LISTEN     0      100          *:8080                     *:*                   users:(("java",pid=857,fd=53))

# LISTEN     0      1      127.0.0.1:8005                     *:*                   users:(("java",pid=857,fd=73))

/usr/local/tomcat/bin/shutdown.sh


mkdir /webapps/ROOT -p

echo "welcome to tomcat mulit instance" > /webapps/ROOT/index.jsp

echo "hello everyone" > /webapps/ROOT/a.jsp

mkdir -p /usr/local/tomcat/instance{1,2,3}/{conf,logs,temp,work}
配置实例server.xml
\cp /usr/local/tomcat/conf/* /usr/local/tomcat/instance1/conf/

\cp /usr/local/tomcat/conf/* /usr/local/tomcat/instance2/conf/

\cp /usr/local/tomcat/conf/* /usr/local/tomcat/instance3/conf/

# Context配置

# Context作用

# 路径映射

# 应用独立配置，例如单独配置应用日志，单独配置应用访问控制

vim /usr/local/tomcat/instance1/conf/server.xml

<Server port="8091" shutdown="SHUTDOWN">       # 管理实例端口

<Connector port="8081" protocol="HTTP/1.1"     # 提供web服务端口

connectionTimeout="20000"

redirectPort="8443" />

<Host name="localhost" appBase="/webapps"

# 如果两个实例对应两个不同的页面，那么直接修改appBase后端的路径就可以了

unpackWARs="true" autoDeploy="true">

vim /usr/local/tomcat/instance2/conf/server.xml

<Server port="8092" shutdown="SHUTDOWN">

<Connector port="8082" protocol="HTTP/1.1"

connectionTimeout="20000"

redirectPort="8443" />

<Host name="localhost" appBase="/webapps"

unpackWARs="true" autoDeploy="true">

vim /usr/local/tomcat/instance3/conf/server.xml

<Server port="8093" shutdown="SHUTDOWN">

<Connector port="8083" protocol="HTTP/1.1"

connectionTimeout="20000"

redirectPort="8443" />

<Host name="localhost" appBase="/webapps"

unpackWARs="true" autoDeploy="true">
创建一个脚本方便启动
chmod +x /usr/local/tomcat/instance1/ins1.sh

#每个tomcat下的instance都要创建一个ins1.sh，并且修改里面的instance

#!/bin/bash

#instace1 script

export JAVA_OPTS='-Xms64m -Xmx128m'

#tomcat实例启动时最小分配的内存为64M，最大为128M

export CATALINA_HOME=/usr/local/tomcat

#tomcat的安装目录

export CATALINA_BASE=/usr/local/tomcat/instance1

#实例1的目录

case $1 in

start)

  $CATALINA_HOME/bin/startup.sh

  ;;

stop)

  $CATALINA_HOME/bin/shutdown.sh

  ;;

restart)

  $CATALINA_HOME/bin/shutdown.sh

  sleep 3

  $CATALINA_HOME/bin/startup.sh

  ;;

esac

chmod +x /usr/local/tomcat/instance1/ins1.sh

cp instance1/ins1.sh instance2/

cp instance1/ins1.sh instance3/

vim instance3/ins1.sh

vim instance2/ins1.sh        # 修改tomcat安装目录instanace分别对应什么目录即可

/usr/local/tomcat/instance1/ins1.sh start

/usr/local/tomcat/instance2/ins1.sh start

/usr/local/tomcat/instance3/ins1.sh start

elinks --dump 39.108.140.0:8081

#   welcome to tomcat mulit instance

elinks --dump 39.108.140.0:8082

#   welcome to tomcat mulit instance

elinks --dump 39.108.140.0:8083

#   welcome to tomcat mulit instance

Nginx+Tomcat负载均衡

修改配置文件，重启服务
# 为了测试看效果使用不同的页面

mkdir /webapp{1..3}

mkdir /webapps1/ROOT

mkdir /webapps2/ROOT

mkdir /webapps3/ROOT

echo webapp1 > /webapps1/ROOT/index.jsp

echo webapp2 > /webapps2/ROOT/index.jsp

echo webapp3 > /webapps3/ROOT/index.jsp

vim /usr/local/tomcat/instance1/conf/server.xml # 分别修改三个配置文件的appBase

vim /usr/local/tomcat/instance2/conf/server.xml

vim /usr/local/tomcat/instance3/conf/server.xml

# 除了修改配置文件appBase，为保证后端Tomcat服务器的日志可以记录客户端真实IP

vim /usr/local/tomcat/instance1/conf/server.xml

prefix="localhost_access_log" suffix=".txt"

               pattern="**%{x-real-ip}i** %l %u %t &quot;%r&quot; %s %b" />

/usr/local/tomcat/instance3/ins1.sh start

/usr/local/tomcat/instance2/ins1.sh start

/usr/local/tomcat/instance1/ins1.sh start
配置Nginx
vim /etc/nginx/nginx.conf

http {

upstream tomcatsrv {

    server 39.108.140.0:8081 weight=1 max_fails=2 fail_timeout=2;

    server 39.108.140.0:8082 weight=1 max_fails=2 fail_timeout=2;

    server 39.108.140.0:8083 weight=1 max_fails=2 fail_timeout=2;

}

vim /etc/nginx/conf.d/default.conf

server {

    listen       80;

    server_name localhost;

    location / {

        proxy_pass http://tomcatsrv;

        proxy_set_header x-real-ip $remote_addr;

        root   /usr/share/nginx/html;

        index  index.html index.htm;

    }

nginx -s reload

elinks --dump 39.108.140.0

   webapp1

elinks --dump 39.108.140.0

   webapp2

elinks --dump 39.108.140.0

   webapp3

# 我们去看下tomcat日志是否记录了真实日志

tail -2 /usr/local/tomcat/instance1/logs/localhost_access_log.2019-11-05.txt

39.108.140.0 - - [05/Nov/2019:12:28:17 +0800] "GET / HTTP/1.0" 200 8

47.92.24.137 - - [05/Nov/2019:12:35:13 +0800] "GET / HTTP/1.0" 200 8


vim /etc/nginx/nginx.conf

http {

upstream nginxsrv {

    server 49.233.69.195:80 weight=1 max_fails=2 fail_timeout=2;

    }

upstream tomcatsrv {

    server 39.108.140.0:8081 weight=1 max_fails=2 fail_timeout=2;

    server 39.108.140.0:8082 weight=1 max_fails=2 fail_timeout=2;

    server 39.108.140.0:8083 weight=1 max_fails=2 fail_timeout=2;

    }

vim /etc/nginx/conf.d/default.conf

    location ~* \.html$ {

        root /usr/share/nginx/html;

        index index.html index.htm;

         proxy_pass http://nginxsrv;

         proxy_set_header x-real-ip $remote_addr;

    }

    location ~* \.jsp$ {

        proxy_pass http://tomcatsrv;

        proxy_set_header x-real-ip $remote_addr;

    }

nginx -s reload

elinks --dump 39.108.140.0/index.html

   welcome to nginx

elinks --dump 39.108.140.0/index.jsp

   webapp1

elinks --dump 39.108.140.0/index.jsp

   webapp2
05-27 02:23
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