Am Montag, den 02.05.2011, 10:06 -0400 schrieb Christopher Schultz: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Felix, > > On 4/30/2011 5:09 AM, Felix Schumacher wrote: > > The original req, as I understood it: > > > > tomcat1 > > \-- /abc* (active) > > |-- /def* (passive) > > > > tomcat2 > > \-- /abc* (passive) > > |-- /def* (active) > > > > If one of those tomcat servers shuts down, the other one should be used > > as failover. > > Yup, that's how I understood things. This should be dead simple, since > the OP has every webapp configured to essentially configure-on-first-access. > > 1. Deploy all webapps on both servers > 2. Configure mod_jk to send all requests for apps on tomcat1 to the > "tomcat1" worker. Configure "tomcat1" worker to have redirect=tomcat2 > (or whatever setting makes that work, if you need jvmroute, etc.). > 3. Configure mod_jk to send all requests for apps on tomcat2 to the > "tomcat2" worker -- mirror config to #2 above. That would be nice, if it would work, but sadly it doesn't.
redirect is only alowed for a sub-worker, which is referenced indirectly by a load balancer group. See http://tomcat.apache.org/connectors-doc/reference/workers.html And just in case, that the documentation would be wrong, I tested it with your simple setup. It doesn't redirect. Regards Felix > > > Thus you will have to define a cluster - or rather two clusters -, > > if you are using mod_jk, as failover and load-balancing are only > > possible within a cluster. > > I think you only need a "cluster" (i.e. an "lb" worker with multiple > lb_workers configured) if you want to failover to more than one target > machine. If the OP just wants to daisy-chain servers like this: > > T1 -> T2 -> T3 -> T4 -> T1 > > ... then only "redirect" should be necessary. > > > Two clusters are needed for each webapp group abc* and def*, since the > > workers can not > > be in active and passive state at the same time. > > The workers are always active. When mod_jk detects failure of, say, > tomcat1 worker, tomcat2 worker is used until tomcat1 recovers. At that > point, the Tomcat2 server has all webapps loaded and will need to be > bounced to reduce the memory usage (or, at least, all hot-standby > webapps will need to be re-deployed). > > > Do you think it could be made easier with mod_jk but use two clusters? > > I assert that no "clustering" is necessary at all. > > - -chris > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.10 (MingW32) > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ > > iEYEARECAAYFAk2+ulsACgkQ9CaO5/Lv0PCLBQCgp2CA7A6AipZSVI1ftltylVFP > +ucAnAwpzvZFLNFQDbfwSGFkWK0kJ6uz > =RI96 > -----END PGP SIGNATURE----- > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
