***NOTE: This document was originally created by a member of the ColdFusion Engineering Team***
Sometimes it is useful to know the real-time load on a ColdFusion Server. One way to get this information is through cfstat, which displays the relevant information at CF server/Tomcat level. Another way to get this information is through Status worker, which displays the information at Webserver/Connector level.
A status worker is a special type of worker which does not communicate with Tomcat. Instead, it gathers configuration and load details from other workers and displays it. It can also be used to change some details dynamically. Configuring a status worker is pretty straightforward. After the connectors are successfully configured with wsconfig tool, we need to change worker.properties and uriworkermap.properties to enable status worker. In worker.properties, add a new worker:
In uriworkermap.properties, add a uri mapping to this worker:
/cf/status = cfstatus
Restart the webserver.
Now whenever a request comes at http://WebserverIP:Port/cf/status, it will be redirected to this status worker which will display the relevant information based on the query parameters in the request.
Some of the common parameters are:
- mime: Specifies the output format. If someone is running a script to get status information and parse it, the value should be xml. If its only used for display purpose, then it should be html.
- cmd: Specifies what action you want to perform. list displays details of all the configured workers. show displays information of a specific worker.
- w: Specifies name of the worker. It should be used along with cmd=show.
- sw: Specifies name of subworker if w referred to a lbworker.
- opt: Specifies which information should not be displayed. It is bitmask of desirable options. The allowed values are:
- 0x0001: hide members of lb workers
- 0x0002: hide URL maps
- 0x0004: hide the legend (Works only with html)
- 0x0008: hide load balancer workers
- 0x0010: hide ajp workers
- 0x0020: only allow read_only actions for a read/write status worker.
- 0x0040: hide load balancer configuration (Works only with html)
- 0x0080: hide load balancer status summary (Works only with html)
- 0x0100: hide configuration for ajp and load balancer member workers (Works only with html)