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How to use apache to serve multiple applications using mod proxy |
Steps
1: Uncomment module in httpd.conf
2: Create two context in Tomcat for testing
3: Add ProxyPass entry to httpd.conf
4: Run
5: Use VertualHost directive
6: Run
1: Uncomment following lines from conf/httpd.conf
LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_http_module modules/mod_proxy_http.so
Note: If you forget to uncomment modules/mod_proxy_http.so following error will occur
proxy: No protocol handler was valid for the URL /App1/.
If you are using a DSO version of mod_proxy, make sure the proxy submodules are
included in the configuration using LoadModule.
2A: Change Tomcat server.xml. This is for testing and not required for actual setting
<Context path="/App1" docBase="C:/workspace/ServletApp/WebContent/" reloadable="true" crossContext="true"
privileged="true">
</Context>
<Context path="/App2" docBase="C:/workspace/ServletApp/WebContent/" reloadable="true" crossContext="true"
privileged="true">
</Context>
2B: /jsp/apache-mod-proxy.jsp This is for testing and not required for actual setting
<%
String ctx = request.getContextPath();
%>
<html>
<head>
<title>/jsp/apache-mod-proxy.jsp</title>
</head>
<body>
<form name="Servlet1" method="post" action="<%=ctx%>/Servlet1">
<h2><%=ctx%></h2>
</form>
</body>
</html>
3: Add ProxyPass entry to httpd.conf
<IfModule proxy_module>
ProxyPass /App1/ http://localhost:8080/App1/
ProxyPassReverse /App1/ http://localhost:8080/App1/
ProxyPass /App2/ http://localhost:8080/App2/
ProxyPassReverse /App2/ http://localhost:8080/App2/
</IfModule>
4: Run - Observe request is made and served through Apache for resource on Tomcat
URL: http://localhost/App1/jsp/apache-mod-proxy.jsp
URL: http://localhost/App2/jsp/apache-mod-proxy.jsp
Now let us try second scenario. You want to use URL like app1.mywebsite.com rather than www.mywebsite.com/app1. This can be
achieved using Apache VirtualHost directive.
5: Add VirtualHost and ProxyPass entry to httpd.conf
NameVirtualHost 127.0.0.1
<VirtualHost app1.mywebsite.com>
ProxyPass / http://localhost:8080/App1/
ProxyPassReverse / http://localhost:8080/App1/
</VirtualHost>
<VirtualHost app2.mywebsite.com>
ProxyPass / http://localhost:8080/App2/
ProxyPassReverse / http://localhost:8080/App2/
</VirtualHost>
6: Add entry to C:\WINDOWS\system32\drivers\etc\hosts file for testing
127.0.0.1 app1.mywebsite.com
127.0.0.1 app2.mywebsite.com
7: Run - Observe request is made and served through Apache for resource on Tomcat
URL: http://app1.mywebsite.com/jsp/apache-mod-proxy.jsp
URL: http://app2.mywebsite.com/jsp/apache-mod-proxy.jsp
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