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I have applications running on tomcat, previously standalone. Now I have to implement high availability for all apps, so here I am.

I have the option of a hardware load balancer or some other means. I will like to know if there are gotchas I have to worry about, especially since I will like to have a single log file location (a single log file between the two application servers I have is preferable).

What do I need to look out for, will multiple file access from the two servers be an issue? Even on linux?

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... especially since I will like to have a single log file location (a single log file between the two application servers I have is preferable).

You can do this by using DRBD with a cluster file system (GFS, OCFS2, ...)

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Of course multiple write acces to a file is forbidden on Linux.

You should look for syslog-ng (open source edition) as solution for centralized logging.

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