Java™ Application Development on Linux - Dator

20.5 Things That Make It Go459runlevel is overwritten by whatever you specify. There is more to this; see themanpage for chkconfig for details.Now, before we put JBoss under management, we need to make a scriptfor it. Or rather, we need to modify the one provided by JBoss. In the binsubdirectory of JBoss, you will find a script called jboss_init_redhat.sh.You will notice that it has the “chkconfig mojo” in it—that is, the“chkconfig:” comment line. We mentioned this in passing when we lookedat the atd init script, but we didn’t tell you what those three numbers after thecolon actually mean. The first is the list of runlevels in which you want theprogram to run. The second is the start priority, which is the number that willfollow the S in the rcX.d runlevel symlink directory. The third number is thestop priority, which is the number that will follow the K in the rcX.d runlevelsymlink directory.These start and stop priority numbers can be very important indeed. Someservices (like NFS) depend upon others (like portmap). Your JBoss server mightdepend on a service like mysqld or postgresql. Don’t toy with these orderslightly. You can seriously mess up your services if you don’t know what you aredoing. Still, you will probably have to tweak things to get them completelyright. Just be cautious and think about every change.Example 20.4 is the script as it comes with JBoss 3.2.3.There are three things we have to change here. The first are the runlevelsin the “chkconfig:” line (we’ll show you the changed lines with a couple oflines of context):## chkconfig: 345 80 20# description: JBoss EJB Container#Next, we may need to change the paths to JBoss and to the Java runtime.In our case, if you installed into /usr/local and created the symbolic link aswe suggested, you don’t need to change the JBOSS_HOME, but you have tochange the JAVAPTH variable: 1414. We are assuming you have set up your Java SDK as described in Chapter 6. If your java*commands are located somewhere else, change this path to point at them.