Nginx+Tomcat在Windows下做负载均衡

一、为什么需要对Tomcat服务器做负载均衡：

Tomcat服务器作为一个Web服务器，其并发数在300-500之间，如果有超过500的并发数便会出现Tomcat不能响应新的请求的情况，严重影响网站的运行。另外，在访问量大的情况下，Tomcat的线程数会不断增加。由于Tomcat自身对内存的占用有控制，当对内存的占用达到最大值时便会出现内存溢出，对网站的访问严重超时等现象，这时便需要重新启动Tomcat以释放占用的内存，这样做便会阻断网站运行。

所以对Tomcat做负载均衡便很有必要。目前可以和Tomcat做负载均衡的主流服务器是Apache，但是Nginx由于功能多、配置简单等优点逐渐成为很多负载均衡服务器的首选。Nginx的并发数可达到50000，所以理论上可以和Tomcat以1:100的比例来配置，这样便可以很好的解决网站并发瓶颈问题。

二、Nginx+Tomcat在Windows下负载均衡配置方法：

Nginx+Tomcat在Windows下做负载均衡相对在Linux下简单不少，因为不论是Nginx还是Tomcat只需要下载Windows下的安装包解压到某个目录下，然后就可以做配置了。

我选择的Nginx是nginx-0.8.49这个版本，Tomcat选择的是apache-tomcat-6.0.26。

下面就是配置过程:

1.将nginx-0.8.49.rar压缩包直接解压到某个目录下(如D:/负载均衡/nginx)。

2.将apache-tomcat-6.0.26.rar压缩包解压，因为是做负载均衡，所以至少要解压两个。(如分别解压到D:/负载均衡/tomcat_1和D:/负载均衡/tomcat_2下面)。

3.将要发布的项目发布到两个Tomcat根目录下的webapps下，保证两个Tomcat下面的项目名称相同。

4.修改其中一个Tomcat的配置文件，该配置文件位于Tomcat目录下的/conf/下，文件名为server.xml，修改其中的<Server port="8005" shutdown="SHUTDOWN">为<Server port="8006" shutdown="SHUTDOWN">，修改其中的

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

connectionTimeout="20000"

redirectPort="8443" />

为

<Connector port="8088" protocol="HTTP/1.1"

connectionTimeout="20000"

redirectPort="8443" />

修改后的文件如下：

<?xml version='1.0' encoding='utf-8'?>

<!--

Licensed to the Apache Software Foundation (ASF) under one or more

contributor license agreements. See the NOTICE file distributed with

this work for additional information regarding copyright ownership.

The ASF licenses this file to You under the Apache License, Version 2.0

(the "License"); you may not use this file except in compliance with

the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software

distributed under the License is distributed on an "AS IS" BASIS,

WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

See the License for the specific language governing permissions and

limitations under the License.

-->

<!-- Note: A "Server" is not itself a "Container", so you may not

define subcomponents such as "Valves" at this level.

Documentation at /docs/config/server.html

-->

<!-- Global JNDI resources

Documentation at /docs/jndi-resources-howto.html

-->

<!-- Editable user database that can also be used by

UserDatabaseRealm to authenticate users

-->

<Resource name="UserDatabase" auth="Container"

type="org.apache.catalina.UserDatabase"

description="User database that can be updated and saved"

factory="org.apache.catalina.users.MemoryUserDatabaseFactory"

pathname="conf/tomcat-users.xml" />

</GlobalNamingResources>

<!-- A "Service" is a collection of one or more "Connectors" that share

a single "Container" Note: A "Service" is not itself a "Container",

so you may not define subcomponents such as "Valves" at this level.

Documentation at /docs/config/service.html

-->

<!--

<Executor name="tomcatThreadPool" namePrefix="catalina-exec-"

maxThreads="150" minSpareThreads="4"/>

-->

<!-- A "Connector" represents an endpoint by which requests are received

and responses are returned. Documentation at :

Java HTTP Connector: /docs/config/http.html (blocking & non-blocking)

Java AJP Connector: /docs/config/ajp.html

APR (HTTP/AJP) Connector: /docs/apr.html

Define a non-SSL HTTP/1.1 Connector on port 8080

-->

<Connector port="8088" protocol="HTTP/1.1"

connectionTimeout="20000"

redirectPort="8443" />

<!--

<Connector executor="tomcatThreadPool"

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

connectionTimeout="20000"

redirectPort="8443" />

-->

<!-- Define a SSL HTTP/1.1 Connector on port 8443

This connector uses the JSSE configuration, when using APR, the

connector should be using the OpenSSL style configuration

described in the APR documentation -->

<!--

<Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true"

maxThreads="150" scheme="https" secure="true"

clientAuth="false" sslProtocol="TLS" />

-->

<!-- An Engine represents the entry point (within Catalina) that processes

every request. The Engine implementation for Tomcat stand alone

analyzes the HTTP headers included with the request, and passes them

on to the appropriate Host (virtual host).

Documentation at /docs/config/engine.html -->

<!-- You should set jvmRoute to support load-balancing via AJP ie :

-->

<!--For clustering, please take a look at documentation at:

/docs/cluster-howto.html (simple how to)

/docs/config/cluster.html (reference documentation) -->

<!--

-->

<!-- The request dumper valve dumps useful debugging information about

the request and response data received and sent by Tomcat.

Documentation at: /docs/config/valve.html -->

<!--

-->

<!-- This Realm uses the UserDatabase configured in the global JNDI

resources under the key "UserDatabase". Any edits

that are performed against this UserDatabase are immediately

available for use by the Realm. -->

<Realm className="org.apache.catalina.realm.UserDatabaseRealm"

resourceName="UserDatabase"/>

<!-- Define the default virtual host

Note: XML Schema validation will not work with Xerces 2.2.

-->

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

unpackWARs="true" autoDeploy="true"

xmlValidation="false" xmlNamespaceAware="false">

<!-- SingleSignOn valve, share authentication between web applications

Documentation at: /docs/config/valve.html -->

<!--

-->

<!-- Access log processes all example.

Documentation at: /docs/config/valve.html -->

<!--

<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"

prefix="localhost_access_log." suffix=".txt" pattern="common" resolveHosts="false"/>

-->

</Host>

</Engine>

</Service>

</Server>

5.修改Nginx配置文件nginx.conf，该文件位于Nginx根目录下的/conf下面。

① 在#gzip on;后面加入下面配置:

upstream backend {

server localhost:8080;

server localhost:8088;

ip_hash;

}

其中server localhost:8080为第一个Tomcat的启动地址，server localhost:8088为第二个Tomcat的启动地址，ip_hash用于做session同步。

② 修改第一个server{}配置中的listen 80;改为新的端口号，因为我的本机80端口被IIS占用，因此将此处改为listen 800;。并将

location / {

root html;

index index.html index.htm;

}

改为：

location / {

root html;

index index.html index.htm;

proxy_pass http://backend;

proxy_redirect off;

proxy_set_header Host $host;

proxy_set_header X-Real-IP $remote_addr;

proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

client_max_body_size 10m;

client_body_buffer_size 128k;

proxy_connect_timeout 90;

proxy_send_timeout 90;

proxy_read_timeout 90;

proxy_buffer_size 4k;

proxy_buffers 4 32k;

proxy_busy_buffers_size 64k;

proxy_temp_file_write_size 64k;

}

其中proxy_pass参数和upstream backend{}对应。

经过上面这些步骤，负载均衡配置就完成，下面前分别启动两台tomcat，然后双击nginx根目录下的nginx.exe文件或者用start nginx启动nginx，打开浏览器，输入地址:http://localhost:800便可看到下面画面:

Nginx+Tomcat在Windows下做负载均衡

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