The problem with this solution is that the webapp really is out of service and unable to serve any pages - it's Apache that will have to serve the "Out of service" page; that's why I'm looking at mod_jk.
Or were you thinking of an Apache filter, rather than a servlets filter? I don't know much about Apache filters Thanks - John -----Original Message----- From: Frank W. Zammetti [mailto:[EMAIL PROTECTED] Sent: Monday, January 23, 2006 2:00 PM To: Tomcat Users List Cc: users@tomcat.apache.org Subject: Re: How can I take a webapp "temporarily out of service" using mod_jk? Hi John, A filter should do the trick for you. Have it interrogate some value somewhere (context value? static class? database?) and when it sees a particular value, redirect to your out of service page. Since your in a cluster, you have the problem of replicating this "out of service" flag to all the nodes... a database would be the obvious answer, but clearly that has performance implications. You may need some special URL in your app that sets the flag, properly secured of course, and make yourself a quick little page that fires it to all nodes. -- Frank W. Zammetti Founder and Chief Software Architect Omnytex Technologies http://www.omnytex.com AIM: fzammetti Yahoo: fzammetti MSN: [EMAIL PROTECTED] On Mon, January 23, 2006 4:56 pm, Prout John - jprout said: > Hi > > > > I am running a JBoss cluster, using tomcat as the Servlet engine. Apache > and mod_jk provide load-balancing of requests over the machines in the > cluster > > > > I need to be able to replace all the URLs in the webapp with a > "Temporarily out of service" page during maintenance, and I need to do > this without making any permanent Apache configuration changes and > without restarting Apache (Operations is very reluctant to restart > Apache). > > > > Does anyone know a way to do this? > > > > I think there may be a way to use the controls on the mod_jk status page > to redirect all requests for a webapp to a different URL ( the "Route > Redirect" input) but this is probably wishful thinking - even if does > allow me to redirect requests, it would probably apply to all the > webapps in the cluster, which wouldn't meet the requirement. The status > page teases me by listing all the JkMounts and JkUnmounts, but doesn't > allow me to change them; adding a JkUnmount dynamically would be a good > solution. > > > > Any Ideas? > > > > John > > ************************************************************************ * > The information contained in this communication is confidential, is > intended only for the use of the recipient named above, and may be > legally privileged. > > If the reader of this message is not the intended recipient, you are > hereby notified that any dissemination, distribution or copying of this > communication is strictly prohibited. > > If you have received this communication in error, please resend this > communication to the sender and delete the original message or any copy > of it from your computer system. > > Thank you. > ************************************************************************ * > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
