Nginx+Tomcat多实例及负载均衡配置

采用nginx的反向代理负载均衡功能，配合后端的tomcat多实例来实现tomcat WEB服务的负载均衡

安装nginx服务

安装所需的pcre库

tar zxf pcre-8.38.tar.gz

cd pcre-8.38

./configure

make && make install

cd ../

编译安装Nginx服务

tar zxf nginx-1.11.3.tar.gz

cd nginx-1.11.3

useradd nginx -s /sbin/nologin -M

yum install openssl openssl-devel -y

./configure --user=nginx --group=nginx --prefix=/application/nginx-1.11.3 --with-http_ssl_module --with-http_stub_status_module

make && make install

nginx服务的相关介绍及编译参数介绍可参考公众号前面的文章，有关服务的详细配置说明都有涉及到

安装JDK环境

Tomcat需要JDK的环境，因此在安装之前需要先安装JDK环境，首先下载好相应的JDK软件包

tar xf jdk-8u60-linux-x64.tar.gz -C /application/

##无需编译直接解压到指定目录

ln -s /application/jdk1.8.0_60 /application/jdk

##创建软链接

sed -i.ori '$a export JAVA_HOME=/application/jdk export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH export CLASSPATH=.$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/lib:$JAVA_HOME/lib/tools.jar' /etc/profile

##配置环境变量

source /etc/profile

##生效配置的环境变量

java -version

##查看JDK环境安装是否成功

安装配置Tomcat多实例

Tomcat的多实例配置也相当的简单，下载相应版本的软件，解压即可使用

tar xf apache-tomcat-8.0.27.tar.gz -C /application/

ln -s /application/apache-tomcat-8.0.27 /application/tomcat

echo 'export TOMCAT_HOME=/application/tomcat'>>/etc/profile

多实例安装配置如下

cp -a apache-tomcat-8.0.27 /application/tomcat8_1

cp -a apache-tomcat-8.0.27 /application/tomcat8_2

切换到相关目录修改相应的配置文件即可

（两个实例的配置文件改动的地方相同，只需要修改端口与站点目录即可）

cd /application/tomcat8_2/conf/

diff /application/tomcat/conf/server.xml ./server.xml

22c22

< <Server port="8005" shutdown="SHUTDOWN">

---

> <Server port="8012" shutdown="SHUTDOWN">

69c69

< <Connector port="8080" protocol="HTTP/1.1"

---

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

123c123

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

---

> <Host name="localhost" appBase="/web/www/bbs"

创建站点目录

mkdir /web/www/{www,bbs}/ROOT -p

echo "hello">/web/www/www/ROOT/index.jsp

echo "world">/web/www/bbs/ROOT/index.html

启动多实例

/application/tomcat8_1/bin/startup.sh

/application/tomcat8_2/bin/startup.sh

配置nginx

vim /application/nginx/conf/nginx.conf

#user nobody;

worker_processes 1;

#error_log logs/error.log;

#error_log logs/error.log notice;

#error_log logs/error.log info;

#pid logs/nginx.pid;

events {

worker_connections 1024;

}

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;

#tcp_nopush on;

#keepalive_timeout 0;

keepalive_timeout 65;

#gzip on;

upstream web_pools {

server 127.0.0.1:8081;

server 127.0.0.1:8082;

}

server {

listen 80;

server_name localhost;

location / {

root html;

index index.jsp index.html index.htm;

proxy_pass http://web_pools;

}

查检语法与启动nginx服务

/application/nginx/sbin/nginx -t

/application/nginx/sbin/nginx

测试负载均衡效果

for i in `echo {1..6}`;do curl 192.168.1.129;done

hello

world

hello

world

hello

world

表明负载均衡配置已经实现