docs: add a blurb in the single-vm doc about cloud-init log output
I had to poke around for awhile to find /var/log/cloud-init-output.log
so I figured I'd add a sentence in the docs about using that.
Change-Id: I8bb6cb730032e41661ee443da816cbea2b28f76d
diff --git a/doc/source/guides/single-vm.rst b/doc/source/guides/single-vm.rst
index c2ce1a3..515cd50 100644
--- a/doc/source/guides/single-vm.rst
+++ b/doc/source/guides/single-vm.rst
@@ -78,6 +78,11 @@
As DevStack will refuse to run as root, this configures ``cloud-init``
to create a non-root user and run the ``start.sh`` script as that user.
+If you are using cloud-init and you have not
+`enabled custom logging <../configuration.html#enable-logging>`_ of the stack
+output, then the stack output can be found in
+``/var/log/cloud-init-output.log`` by default.
+
Launching By Hand
-----------------