docs: Add warnings about password selection
Some services fail when using special characters in passwords, add some
warnings to our docs.
Closes-Bug: 1744985
Change-Id: I601149e2e7362507b38f01719f7197385a27e0a8
diff --git a/doc/source/configuration.rst b/doc/source/configuration.rst
index 757b400..d59c1ed 100644
--- a/doc/source/configuration.rst
+++ b/doc/source/configuration.rst
@@ -181,6 +181,9 @@
If the ``*_PASSWORD`` variables are not set here you will be prompted to
enter values for them by ``stack.sh``.
+.. warning:: Only use alphanumeric characters in your passwords, as some
+ services fail to work when using special characters.
+
The network ranges must not overlap with any networks in use on the
host. Overlap is not uncommon as RFC-1918 'private' ranges are commonly
used for both the local networking and Nova's fixed and floating ranges.