I've combined the core nginx.conf with the proxy config, which all goes
into /etc/nginx/nginx.conf.
I've made a number of changes:
* Nginx now proxies both SQL API and Windshaft requests through Varnish.
* Nginx adds a custom HTTP header, X-Carto-Service, so that Varnish can
differentiate between backends (since it can't do so based on incoming
port).
* I've modified the primary Nginx log format to include more information
on how requests are being proxied--you can now see the upstream address
for proxied requests.
* I've added the `proxy_no_cache` and `proxy_cache_bypass` directives to
the Windshaft and SQL API proxy sections. Without those directives,
Nginx may attempt to act as a cache, returning 304 Not Modified for
resources that more accurately should be cached by Varnish (whose cache
is invalidated via a Postgres trigger for updated metadata).
* Use Varnish 3 from source tarball, newer and OS Varnish could not disable telnet authentication required by Carto
* Remove sources of varnish, gdal, /cartodb/.git when no longer needed in order to make image smaller
* Dropped Nokia and GMAP basemaps, they did not work
* Dropped schema trigger installation, it is no longer needed
* Configure Carto in Python and NodeJS
* Build assets
* Use self as asset_host, assets are hosted by nginx instead of rails
