+A1 (Dockerfile), Dockerfile-Unit-Test, and all three integration test
+receivers use an Alpine base image and install RMR from a base builder
+image. Must update and rebuild all 5 containers in the A1 repo (or
+just A1 itself for production usage).
+
+In addition these items in this repo must be kept in sync:
+
+#. ``rmr-version.yaml`` controls what rmr gets installed for unit
+ testing in Jenkins
+#. ``integration_tests/install_rmr.sh`` is a useful script for a
+ variety of local testing.
+
+
+Version bumping Python
+----------------------
+
+If you want to update the version of python; for example this was
+recently done to move from 3.7 to 3.8, update these files:
+
+#. ``Dockerfile``
+#. ``Dockerfile-Unit-Test``
+#. ``tox.ini``
+
+
+Running A1 Standalone