Automatically start the tomcat services

[Tom Cook]

Hi Experts,

i have tomcat installed in my server SunOS 5.10 Generic_148888-01 sun4v sparc sun4v.

i am looking your help to implement -
whenever my tomcat service go down it will automatically get started after sometime say after 15 min.

i checked the various option like crontab for user, but i got to know that we can achieve this in the tomcat configuration itself.
also i can't go ahead with the crontab because of the approval process involves in editing crontab -e.
can you please help me in what configuration i need to do in tomcat itself.

Thanks in advance!

Best Regards,
Yuva

[Tim Holloway]

No, Tomcat does not come with any support for setting a poll/restart interval.

Tomcat isn't supposed to "go down" by itself. If it does, that means that either Tomcat was set up sloppy or - and this is more common - webapps were designed sloppy. In the rare case that Tomcat dies because the JVM crashes, someone should determine what's going on and fix it. Usually a different JVM verson will solve that, since JVMs aren't supposed to crash either.

If Tomcat is restarting itself after 15 minutes then somewhere, somehow, there's already something out in your shop's infrastructure that's doing that. Either it's a cron task or some sort of monitoring and control system such as CA-Unicenter or Nagios.

So, first: determine why Tomcat is crashing. Fix it.

Secondly, find out what mechanism is restarting Tomcat and adjust that, if necessary.

Tomcat is not a toy. If you have to go through some sort of change control process to get it fixed, do so.

[Tom Cook]

Hi Tim,

Thank you for the response.
may be i was not clear it the earlier communication, i do not find it crashing in my env.

just wanted to add this functionality in my tomcat configuration.
if that is possible.

Best Regards,
Yuva

[Tim Holloway]

Sorry. That's outside of Tomcat's remit.

Personally, I get a little nervous when servers restart themselves before I know that they've gone down. There's always the chance that the recovery process won't clean up properly and could therefore make the problem worse.

[Tom Cook]

Hi,

now this additional functionality became mandatory for me.
Customer wants this functionality to be implemented.

actually is are one server - SunOS 5.10 Generic_148888-01 sun4v sparc sun4v

two tomcat 6.0 and 8.0 are available in this system.
if i stop the service for tomcat 6.0, it is starting automatically after sometime.
i have to do it for same for tomcat 8.0.

i checked the crontab -l , it is empty. so i am confused.
where can i verify the setting for 6.0. any pointer will be helpful.

Thanks,
Tom

[Tim Holloway]

As I said, Tomcat has absolutely no auto-restart capabilities at all, cron or no cron. Whatever is doing your restarting isn't Tomcat.

You might check the /etc/crontab file and its relatives in /etc/cron.xxx directories and see if there's something set up there. System-level control often is done that way rather than as a "crontab -e" function. It's easier to administrate.

[Tom Cook]

Hi Tim,

Thank you for the help.
i created a shell script (attached).

then i have modified the crontab for the particular user who is responsible for to start the services related to tomcat.
to check it for every 5 min.

no need of root level access.

Thanks,
Brijendra