Thanks Chris, thanks for the lead on this, will test this scenario and update on this.
Thanks Niranjan On Tue, Jun 14, 2016 at 3:56 PM, Christopher Schultz < ch...@christopherschultz.net> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Niranjan, > > On 6/14/16 10:06 AM, Niranjan Babu Bommu wrote: > > Thanks for your reply, here I'm attaching server.xml file in this > > email. > > > > actually we are running MHA for mysql where we can spin up new db > > server and add to the cluster or change the IP of db server > > without impacting end user. our application is running on both > > tomcat and jboss we switch whenever we want, Recently we have > > noticed that when we replaced the db server, jboss is able to > > detect the dns change and sends connection requests to new IP where > > as tomcat sending connection requests to the old IP and throws > > tons of error. Since we can't test this in real time in prod, we > > were able to replicate this test env. > > > > tried with simple java program where it polls the host name while > > I'm changing the IP address of the server in DNS. I'm able to see > > the new IP address imminently when I change that IP in DNS. this > > confirms that java security setting looks fine, the same in-house > > application works in jboss when we change the IP of DB server but > > tomcat behaving differently. I ran out of options to figure out > > where is the problem. > > What if you write a simple JSP, etc. that reports the IP address of > db1.local and auto-refreshes every second? > > My suspicion is that the jdbc-pool is continuing to use connections > that have already been established. No DNS resolution is performed to > communicate over an existing TCP/IP connection. > > When you change the IP address of db1.local, are you also terminating > all TCP/IP connections to the old db1.local host? If not, they will > continue to function as if no change had occurred. New connections are > likely to connect to the use server. > > Why are you playing games with IP addresses? If you are using MySQL > HA, why not run it on a machine that doesn't change IP addresses and > use that as a proxy to your db cluster? Then the HA proxy takes care > of everything and you don't need to re-IP your whole cluster while > it's running. > > - -chris > > > On Tue, Jun 14, 2016 at 4:04 AM, Mark Thomas <ma...@apache.org > > <mailto:ma...@apache.org>> wrote: > > > > On 13/06/2016 19:21, Niranjan Babu Bommu wrote: > >> Hi All, > >> > >> I have an issue with tomcat dns cache ttl, > > > > That simply is not possible. Tomcat doesn't cache DNS entries. > > > >> where if I change the IP address of the database, tomcat still > >> sending connection requests to an old IP until I restart tomcat, > > > > Now that sounds like a better start to the problem description. You > > are going to need to expand on that. A lot. > > > > Tomcat doesn't use a database by default so is this really a > > Tomcat issue or an application issue? How is the database > > configured? Is connection pooling being used? How are you > > confirming connection requests are being directed to the old IP > > address? Define "restart Tomcat". > > > > Mark > > > >> this is not the case with Jboss. I verified in java security, > >> this what we have in java. > >> > >> #networkaddress.cache.ttl=-1 > >> > >> since this property has been disabled, by default ttl will be 30 > >> sec, jboss 7 is respecting this value, but not tomcat. > >> > >> so far I have tried these things in tomcat. > >> > >> https://bz.apache.org/bugzilla/show_bug.cgi?id=33226 > >> > >> neither of these settings is not working in tomcat > >> > >> -Dnetworkaddress.cache.ttl=0 or -Dsun.net.inetaddr.ttl=0 > >> > >> > >> java version "1.7.0_60" tomcat-7.0.56 os centos 6. > >> > >> can someone please help me out to fix this issue > >> > > > > > > --------------------------------------------------------------------- > > > > > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > > <mailto:users-unsubscr...@tomcat.apache.org> For additional > > commands, e-mail: users-h...@tomcat.apache.org > > <mailto:users-h...@tomcat.apache.org> > > > > > > > > > > -- /*Thanks*/ /*Niranjan*/ /*+1 781.956.6900*/ > > > > > > > > --------------------------------------------------------------------- > > > > > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > > For additional commands, e-mail: users-h...@tomcat.apache.org > > > -----BEGIN PGP SIGNATURE----- > Comment: GPGTools - http://gpgtools.org > Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ > > iEYEARECAAYFAldgYWkACgkQ9CaO5/Lv0PBbGQCeIuMkUUcAZX1m5aE8Yh40lgll > hJAAn3rSoZspVPai4PH5eJYh79wPzfPl > =EX/E > -----END PGP SIGNATURE----- > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > > -- *Thanks* *Niranjan*
