-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 James,
On 3/7/14, 1:16 PM, James H. H. Lampert wrote: > I've been asked to come up with a command-line (or batch job) > utility (running on an AS/400) to check, programmatically, whether > a Tomcat context that's part of one of our products is alive and > accepting connections, or hung. Do you already have any kind of monitoring infrastructure? If so, what is it? > I'm already attempting to pick the brains of our people who > developed the Tomcat context, to see what they can recommend I do. > And I've also asked the Midrange List for their suggestions. > > But I'd like the Tomcat List's input as well. One idea I had, since > we bundle an open-source AS/400 HTTP client library called HTTPAPI > with the product, was to send test requests to the context via > HTTPAPI. > > Another idea I've had would be to run some sort of headless test > Java program, since the AS/400 does include a JVM (after all, it > wouldn't be able to run Tomcat without one). Are there any re quirements that the program be "local" to the JVM where Tomcat is running? You can connect via TCP to either an HTTP connection or an AJP to see if a "knock knock" works, and you don't have to do it with either an AS/400 native application /or/ Java -- you can ping it from the outside if you want. As for telling if the "context" is up and running, that's a bit tough: you'll need something available "inside" the context that can tell you what you want to know. For instance, if you want to know if you can connect and run a JSP, then just write a JSP called "ping" or something that writes "OK" back to the response stream. Then just connect via HTTP and look for that string. If you're looking for something more robust, you might want to check for other things -- like the status of the executor's thread pool, connector status, etc. You can do stuff like via JMX, and there's already a webapp that ships with Tomcat that will let you inspect JMX beans via HTTP: the Manager webapp. If you want to see how you can monitor Tomcat in this way, think about attending ApacheCon NA 2014 in April in Denver, CO. I'll be giving a presentation on this exact topic. (Well, not checking "context health", as that's kind of an application-specific thing). - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: GPGTools - http://gpgtools.org Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQIcBAEBCAAGBQJTGis7AAoJEBzwKT+lPKRYT0MQAL5gBg8erFPArm+NwsItxR0D Eg/2lvqf6Ksf8t69r8kpbo7t2nQL/2RaRlCo1mkq64fGVZxiUC246AyQofJMMpKr cnJudhKC5XHrTcwPfb2XLtHzamkLbIrgXS6gPXcyzEXcrFgQBI38T2XTL1JIz5cJ MPM5w/jE4ouoMFJ2t32ofFA2naXmA/EcY/EKYWW2y+TmslduauVzh+uuSuhyfTCM 9wV34dh16b9BMn7jJ2mqG5L0cyivADiYpF8cO3KoyxY+iPrmjTlLcGGtPU2boS1U p91COAp5Cpf9zSJ9e/XUyInmTyYyx5hPGQ8oD9Fn0SUzej8167e41hU7jy93mSX/ W/XU2xvfqEVJmdv8RlsB1IQQCwhz0/wGc2snXhRiuF+a4HxomqMkMeuMHUHMG1XZ C7sYtxJLGgGzIETO/dFhUBdQR8aK8/m7GCJpXiPZxPLux3DenWxGsqVn6UOe6gdA Wmp4dvEqqbCmKOxkgNi51KV6/eQKGgM97FTw1kd1371AZ1oqADCS307Hf6dsFMbr 30yU+ZSwEuh9IPijTolhhqrpRAgj7wyWMOkIvu2mkYOs1kWUR9u7ErttXq1WRo8g 7jGbf5RlodSf9DroECt9Xk9p885XQPQDeSuLP5MfTx3WcV0YWe49F/9KiK9sQdJ2 9/4fUE+QAxe1+JkirWRw =gl4p -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
