Hello, webmin has the HA monitor module that helps with setup and config on Linux boxes.
James Ellis wrote .. > > Rainer, > > Thanks for your feedback: > > > Also: if you do clustering, you might be concerned about availability. > The > load balancer itself is a single point of failure, unless you > implement some > redunfdancy in that layer to. > > That's another concern I have. I was thinking of Linux HA - although I have > never > used it so I'm hoping its not that difficult to setup/administer. > > > Date: Wed, 6 Feb 2008 22:33:39 +0100> From: [EMAIL PROTECTED]> To: > > users@tomcat.apache.org> > Subject: Re: Tomcat and Apache mod_jk For Failover> > Hi James,> > James Ellis > schrieb:> > I am trying to set up a cluster of Tomcat servers where they> > > replicate > session btwn the tomcat servers. My questions are:> > > > 1) For failover, if > I > am using apache/mod_jk as a load balancer, will> > it automatically detect if > one > of the members in the cluster is down> > and not route requests to it?> > Yes, > if the problem is formally detectable, e.g. network problems, no > responses > etc. > What problems get detected depends much on configuration. > Have a look at> > > http://tomcat.apache.org/connectors-doc/generic_howto/timeouts.html> > > and for a complete list of attributes at> > > > http://tomcat.apache.org/connectors-doc/reference/workers.html> > > You should configure a status worker, such that you can inspect your > load > > balancer > status via a HTML GUI. See> > > http://tomcat.apache.org/connectors-doc/reference/status.html> > > > 2) Are there any issues assoicated with SSL and apache as the load> > > > > balancer?> > > Not that I'm aware of, but maybe I don't get the point. Usually you > > > terminate > SSL on httpd and then simply use AJP13 as a protocol between > mod_jk and > Tomcat. > More or less it's the only protocol mod_jk speaks.> > The module then > automatically > tells Tomcat, if the original request was > coming in via http or https.> > > > 3) > Are there performance gains by using Apache/mod_jk as the load> > balancer, or > should I just use another Tomcat instance and the> > "balancer" web app?> > > More > often performance is not the key decision criterion. I assume the > balancer > webapp > is not really production grade, but others might correct > me here.> > To > choose > the right load balancing solution, you have to decide which > people should > administer > and troubleshoot it, and which technology best > fits their skills (network > appliances, > Apache web server with mod_jk, ...).> > Also: if you do clustering, you might > be > concerned about availability. > The load balancer itself is a single point of > failure, > unless you > implement some redunfdancy in that layer to.> > > Thanks,Jim> > > Regaqrds,> > > Rainer> > > > ---------------------------------------------------------------------> > To start a new topic, e-mail: users@tomcat.apache.org> To unsubscribe, e-mail: > [EMAIL PROTECTED]> For additional commands, e-mail: [EMAIL PROTECTED]> --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
