Event Handlers, start a java program, nohup issues.

[Kevin Keane]

First, put a space in front of that &. Otherwise, it may be treated as 
part of the variable name.

Second, I believe that the 2>&1 needs to come AFTER the redirection to 
$LOG_FILE. Otherwise, what you are doing is redirecting stderr to stdin 
- which is still the console - and THEN redirecting stdin to the log 
file. I always get this wrong, though - it might be exactly opposite of 
what I'm thinking.

But if I'm right, because stderr is still attached to the console, 
nagios would still consider it to be in the foreground.

Marco Tirado wrote:
>
> That is exactly what I am doing (or trying to do with) the "&" 
> character at the end of my command. But it does not appear to be 
> working, the command looks like this:
>
> nohup $JAVA_CMD -cp $CLASSPATH $JVM_OPTIONS JMXServer $PORT </dev/null 
> 2>&1 >> $LOG_FILE&
>
> Any suggestions? Am I missing something else?
>
> //Marco
>
> On Thu, Jul 2, 2009 at 10:50 AM, Andreas Ericsson <ae at op5.se 
> <mailto:ae at op5.se>> wrote:
>
>     Marco Tirado wrote:
>
>         Hello Users:
>
>         I have a problem with an event handler of mine. The handler
>         starts a java
>         daemon-like program which loops forever waiting for
>         connections and performs
>         JMX queries against our java applications.
>
>         The problem is that the handler times out when it is run by
>         nagios. This is
>         what I see in the logs:
>
>         [01-07-2009 18:45:36] SERVICE EVENT HANDLER:
>         bj-mon-01;JMX_Server_Running;(null);(null);(null);start_jmx_server
>         [01-07-2009 18:46:07] Warning: Service event handler command
>         '/usr/local/nagios/libexec/eventhandlers/start_jmx_server
>         CRITICAL SOFT 1'
>         timed out after 30 seconds
>
>         The event handler should start my JMXServer both in hard and
>         soft states. I
>         have run the command from the console as the "nagios" user and
>         it works, so
>         the problem has nothing to do with user rights for nagios.
>
>         The problem is that the handler hangs when I run "nohup"
>         followed by my
>         command for starting the server (see the red text below).
>
>         My event handler looks like this:
>
>         ###########################
>         # PROPERTIES
>         ###########################
>
>         PORT="4444"
>         ECHO_CMD="/bin/echo"
>         JAVA_CMD="/usr/bin/java"
>         CLASSPATH="MyClasspath"
>         JVM_OPTIONS="MyOptions"
>
>         ###########################
>
>         # What state is the JMXServer in?
>         case "$1" in
>
>         OK)
>                ;;
>
>         WARNING)
>                ;;
>
>         UNKNOWN)
>                ;;
>
>         CRITICAL)
>
>                case "$2" in
>
>                SOFT)
>
>                        `$ECHO_CMD "TRYING restart" >> /tmp/test`
>                        nohup $JAVA_CMD -cp $CLASSPATH $JVM_OPTIONS
>         JMXServer $PORT
>         </dev/null 2>&1 >> $LOG_FILE&
>                        `$ECHO_CMD "TRYING restart" >> /tmp/test`
>
>                        ;;
>
>                HARD)
>
>                        `$ECHO_CMD "TRYING restart" >> /tmp/test`
>                        nohup $JAVA_CMD -cp $CLASSPATH $JVM_OPTIONS
>         JMXServer $PORT
>         </dev/null 2>&1 >> $LOG_FILE&
>                        `$ECHO_CMD "FINISHED trying" >> /tmp/test`
>
>                        ;;
>
>                esac
>
>                ;;
>
>         esac
>
>         exit 0
>
>
>
>         Any help, hint or recommendation is deeply appreciated.
>
>
>     You need to make the java daemon run in the background. That will make
>     Nagios ignore it after it has moved from the foreground.
>
>     -- 
>     Andreas Ericsson                   andreas.ericsson at op5.se
>     <mailto:andreas.ericsson at op5.se>
>     OP5 AB                             www.op5.se <http://www.op5.se>
>     Tel: +46 8-230225                  Fax: +46 8-230231
>
>     Considering the successes of the wars on alcohol, poverty, drugs and
>     terror, I think we should give some serious thought to declaring war
>     on peace.
>
>
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>
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-- 
Kevin Keane
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