Get or generate a SSL certificate and install it into Apache.SSL provides a secure connection between Tomcat and Apache, the steps involved in getting this working are To let Apache know where the Tomcat servers are a file called workers.properties is created detailing this information. When you want to service more requests than the capacity of a single physical server.When you want different virtual hosts to be served by different Tomcat workers.When you want different Web application contexts to be served by different Tomcat workers.You may what to implement multiple workers for the following reasons Each worker is identified by a unique hostname or a unique IP address and port number. However you can run multiple instances of Tomcat in a cluster to implement load balancing or site partitioning. The configuration of a AJP Connector is below AJP Connector exampleĪ worker represents a running instance of Tomcat, a worker serves the requests for all dynamic web components. This saves the overhead of opening a new socket connections for each request, its a bit like a connection pool. One of the ways the AJP protocol reduces latency is by making the Web server reuse already open TCP-level connections with Tomcat. Support of clustering by forwarding requests to multiple Tomcat 6 servers. Support for SSL, encryption and client certificate.On the return path the packets are prefixed by AB (the ASCII codes for A and B), the size of the packet and then the payload. The AJP packet consist of a packet header and a payload, below is the structure of the packetĪs you can see, the binary packet starts with the sequence 0X1234, this is followed by the packet size (2 bytes) and then the actual payload. The Apache JServ Protocol (AJP) uses a binary format for transmitting data between the Web server and Tomcat, a network socket is used for all communication. Apache will receive the incoming JSP or servlet request and using the Apache module will pass this request via the AJP protocol to Tomcat, the response will also be sent back to the Apache server via the AJP protocol. The below diagram shows how the native code Apache module ( mod_jk or mod_proxy) works with Tomcat. Both are native code extension modules written in C/C++, on the Tomcat side the software module is the AJP Connector written in Java. The AJP protocol is used for communication between Tomcat and Apache, the software modules used on Apache are mod_jk or mod_proxy. The JK Connector uses the Apache JSserv Protocol (AJP) for communications between Tomcat and Apache. Tomcat can be integrated with Apache by using the JK Connector. Most Tomcat configurations are a Apache/Tomcat setup, Apache serving up the static content and then passing any JSP to Tomcat to process.
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