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+## Operate and debug ODL for testing
+
+### Debug ODL
+
+#### Activate or deactivate log point
+
+Getting Log info about a specific service:
+
+    log:set DEBUG com.highstreet.technologies
+
+Getting all NETCONF/YANG traffic (Hint: huge amount of data, only for test purpose):
+
+    log:set TRACE org.opendaylight.netconf
+
+For switching off logging set level to INFO to see the log point
+
+    log:set INFO org.opendaylight.netconf
+
+For deleting the log point for a package
+
+    log:set DEFAULT org.opendaylight.netconf
+
+Configuration of logging is done here:
+
+    vi $ODL_KARAF_HOME/etc/org.ops4j.pax.logging.cfg
+
+#### View the log
+
+A good option is to cd into the log directory and use grep and vi to view into the logs.
+
+    cd $ODL_KARAF_HOME/bin/data/log
+
+A second option is within the karaf command line to use the command *log:display* in combination with grep.
+
+    log:display | grep
+
+
+### Operate ODL
+
+#### In shell or background
+
+There are two way to start and run ODL. The command are available in the $ODL_KARAF_HOME/bin directory.
+
+  1. In the karaf shell
+   - Using *./bin/karaf* command to run ODL in a shell.
+   - In this way of operation ODL is running if the shell is running.
+   - If you leave the shell by shutdown or logout command ODL is stopped.
+
+  2. In the background
+   - Use command *./bin/start*, *./bin/stop* to run and stop ODL.
+   - Attaching to the command line with *client*
+   - In this way of operation ODL is running in the background.
+
+#### Check if ODL is running
+
+A good way to check if ODL is running is to use the command
+
+    ps -ef | grep karaf
+
+The feedback of *status* is not always true during startup or shutdown.
+In some cases ODL run two times in a JVM what needs to be avoided.
+
+