> -----Messaggio originale----- > Da: Sivapatham, Hari [mailto:[EMAIL PROTECTED] > Inviato: mercoledì 5 novembre 2008 18.10 > A: [email protected] > Oggetto: Designing tomcat failover > > Hello, > I have to design a failover setup and I am looking for rough > ideas/pointers. Here is our scenario... > > TomcatServer1 <-------/Cannot communicate to one > another/-----> TomcatServer2(hot backup) > ^ ^ > ^ > | \ > | > | \ --- TO DO: Switch to > TomcatServer2 if server 1 is down---| > | \ / > TomcatClient1 TomcatClient2 > > (Following text simply puts the above picture in words, in > case it doesnt show up aligned on some email clients) > - TomcatServer1 is a 5.5 tomcat that provides services. Its > clients are other tomcat instances (say TomcatClient1, > TomcatClient2). > - We have a redundant TomcatServer2 that is a hot backup for server1. > - For simplicity sake, we can assume that there is no need to > share session information among TomcatServer1 and > TomcatServer2. Also, for practical reasons, we cannot have > any communication between them (our clients would resist > opening up ports). > > Our applications on TomcatClient1 and TomcatClient2 are > configured to talk to TomcatServer1. The task at hand is, the > client tomcat instances should automatically switch to > TomcatServer2 if they detect that > TomcatServer1 is down. > > So, I am looking for a failover solution for outgoing requests from > TomcatClient1 and TomcatClient2. The only option I have right > now is for our apps to handle the failover. I wanted to check > if there is some module that I can use (filter/valve/apache > module) that would handle the failover. > > I appreciate any ideas you might suggest. > Thanks! > Hari > > >
The simplest solution popping in my mind is to use a wrapper on tomcatclient1 and tomcatclient2 togheter with a "mon" probe. You can configure tomcatclient1 to talk to a local wrapper who send the connection to tomcatserver1. The same on tomcatclient2. The "mon" probe will test the connection to tomcatserver1 and if it detects a failure it reconfigure the wrapper to let the connection go to tomcatserver2. Let me know if you'd like more details on this. Leandro --------------------------------------------------------------------- To start a new topic, e-mail: [email protected] To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
