Github user nakomis commented on a diff in the pull request:
https://github.com/apache/incubator-brooklyn/pull/354#discussion_r21003053
--- Diff: docs/dev/build/debugging-remote-brooklyn.md ---
@@ -0,0 +1,135 @@
+---
+layout: page
+title: Brooklyn Remote Debugging
+toc: /toc.json
+---
+
+Usually during development, you will be running Brooklyn from your IDE
(see [IDE Setup](ide.html)), in which case
+debugging is as simple as setting a breakpoint. There may however be times
when you need to debug an existing remote
+Brooklyn instance (often referred to as Resident Brooklyn, or rBrooklyn)
on another machine, usually in the cloud.
+
+Thankfully, the tools are available to do this, and setting it up is quite
straightforward. The steps are as follows:
+
+* [Getting the right source code version](#sourceCodeVersion)
+* [Starting Brooklyn with a debug listener](#startingBrooklyn)
+* [Creating an SSH tunnel](#sshTunnel)
+* [Connecting your IDE](#connectingIDE)
+
+## <a name="sourceCodeVersion"></a>Getting the right source code version
+The first step is to ensure that your local copy of the source code is at
the version used to build the remote Brooklyn
+instance. The git commit that was used to build Brooklyn is available via
the REST API:
+
+```
+http://<remote-address>:<remote-port>/v1/server/version
+```
+
+This should return details of the build as a JSON string similar to the
following (formatted for clarity):
+
+```JSON
+{
+ version: "0.7.0-SNAPSHOT",
+ buildSha1: "c0fdc15291702281acdebf1b11d431a6385f5224",
+ buildBranch: "UNKNOWN"
+}
+```
+
+The value that we're interested in is `buildSha1`. This is the git commit
that was used to build Brooklyn. We can now
+checkout and build the Brooklyn code at this commit by running the
following in the root of your Brooklyn repo:
+
+```
+git checkout c0fdc15291702281acdebf1b11d431a6385f5224
+mvn clean install -DskipTests
+```
+
+Whilst building the code isn't strictly necessary, it can help prevent
some IDE issues.
+
+## <a name="startingBrooklyn"></a>Starting Brooklyn with a debug listener
+By default, Brooklyn does not listen for a debugger to be attached,
however this behaviour can be set by setting JAVA_OPTS,
+which will require a restart of the Brooklyn node. To do this, SSH to the
remote Brooklyn node and run the following in the
+root of the Brooklyn installation:
+
+```
+kill `cat pid_java`
+export JAVA_OPTS="-Xms256m -Xmx1g -XX:MaxPermSize=256m
-agentlib:jdwp=transport=dt_socket,address=127.0.0.1:8888,server=y,suspend=n"
--- End diff --
JAVA_OPTS isn't set in the shell before running the brooklyn script, it's
set explicitly in the script:
https://github.com/apache/incubator-brooklyn/blob/master/usage/dist/src/main/dist/bin/brooklyn#L32-L35
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