silverlining / docs / filelayout.txt

File Layout

This document describes how files are laid out in the Silver Lining
code base, and on production servers (and how the two relate).

General Patterns

Anything that is a "script" (a file meant to be executed) generally
has a ``-`` in the name somewhere, to help indicate that it is *not* a
module (since you cannot import names with dashes).

The Silver Lining Code Base

Here are some notable features:

* The ``silverlining`` package is basically for *managing* the
  process.  It is *not* installed on the production servers, nor is it
  generally importable by applications (nor is there anything worth

* The ``silversupport`` is uploaded to the production server, and also
  used locally.  Applications may find it useful to import some
  routines from this library.  There's also simply pieces here that
  both ``silverlining`` and server management scripts need to use, and
  this is the one shared codebase for that.

* ``silversupport`` gets uploaded to
  ``/usr/local/share/silverlining/lib`` (this directory is added to
  ``sys.path`` to make it importable).

* There are a bunch of scripts that are run *on the server*.  Lots of
  what Silver Lining does is just ``ssh server "command"``, with the
  actual code on the server.  All Silver Linings scripts are uploaded
  *from* ``silverlining/mgr-scripts/`` to
  ``/usr/local/share/silverlining/mgr-scripts/``.  These are *only*
  run on the server, not locally.  Each script also adds
  ``/usr/local/share/silverlining/lib`` to its path at the top of the

* Files in ``silverlining/server-files/`` are rsync'd to the server's
  root.  That is, the file layout under that directory matches the
  server layout exactly.  ``silversupport`` and ``mgr-scripts`` are
  rsync'd separately.

* Some of the files used for *setting up* a server are in
  ``silverlining/server-sync-scripts/``.  This includes the *very
  important* ```` script, which does most of the
  configuration of servers.  If there's anything that needs to be done
  (or checked, or fixed) every time a server is created or updated,
  that's probably the place to look.  (Per-service tasks, like
  installing a database configuration file, go in the service code.)


Services are modules in ``*``, named after the
service.  Resource files for services go in that package as well (for
instance, the ``pg_hba.conf`` that the postgis service uses is in

Server Files

The files created by ``silver setup-node`` are generally put in

Configuration files get put wherever they belong, e.g.,

Log files go in ``/var/log/silverlining/``.

Individual applications have log files in
``/var/log/silverlining/apps/APP_NAME``, specifically ``errors.log``
is anything written to stderr, stdout, or ``environ['wsgi.errors']``.
These items are also grouped by request (all content written is
buffered, written out in one chunk with a header/footer to help group
it to a request).