Github user aledsage commented on a diff in the pull request:
https://github.com/apache/brooklyn-docs/pull/131#discussion_r91708839
--- Diff: guide/ops/troubleshooting/increase-entropy.md ---
@@ -4,24 +4,52 @@ title: Increase Entropy
toc: /guide/toc.json
---
-If you are installing Apache Brooklyn on a virtual machine, you may find
it useful to increase the
-Linux kernel entropy to speed up the ssh connections to the managed
entities. You can install and
+### Checking entropy level
+
+A lack of entropy can cause random number generation to be extremely slow.
+This results in tasks like ssh to also be extremely slow.
+Check the available entropy on the Apache Brooklyn machine with.
+
+{% highlight bash %}
+cat /proc/sys/kernel/random/entropy_avail
+{% endhighlight %}
+
+It should be a value above 2000
+
+If you are installing Apache Brooklyn on a virtual machine you will
probably have little entropy you may need
--- End diff --
Reword:
```
If you are installing Apache Brooklyn on a virtual machine, you may find
that it has insufficient
entropy. You may need to increase the Linux kernel entropy in order to
speed up the ssh connections
to the managed entities. You can install and configure `rng-tools`, or just
use /dev/urandom`.
```
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