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Dependencies
Chris Stephens edited this page Jul 9, 2015
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reddit has a PPA on launchpad.net where packages can be found for Ubuntu 12.04 Precise Pangolin. If a dependency below cannot be satisfied by the Ubuntu 12.04 archives, it will be marked reddit ppa and can be fetched from there. Alternative package managers may provide these packages in the right version natively.
In a simple environment, these can all be run on one machine. For a larger site, they will almost certainly need to be split out to different hosts.
| Dependency | Version | Ubuntu Package(s) | Description |
|---|---|---|---|
| PostgreSQL | 9.0+ | postgresql |
Robust RDBMS. Used as primary data store. |
| Cassandra | 1.0+ |
cassandra in (reddit ppa) |
Distributed database. Slowly becoming primary data store. |
| memcached | 1.4+ | memcached |
Fast in-memory caching server. Used throughout reddit. |
| RabbitMQ | 2.0+ | rabbitmq-server |
AMQP server. Used for offline processing. |
| HAProxy | haproxy |
Load balancer for distributing requests to app servers. | |
| stunnel | patched |
stunnel (reddit ppa) |
For HTTPS support. Needs to be a version with the X-Forwarded-For patches on top. |
The following libraries are prerequisites before an install can begin. With these requirements satisfied, setup.py should be able to take care of the remaining python dependencies.
| Dependency | Version | Ubuntu Package(s) | Description |
|---|---|---|---|
| Setuptools | 0.6.16+ | python-setuptools |
Python package management. |
| Python | 2.7.x | python-dev |
Headers for building python modules. |
| libmemcached | 0.32+ | libmemcached-dev |
For communication with memcached. |
| libpq | libpq-dev |
C library for PostgreSQL. | |
| libxml2 | libxml2-dev |
XML Parsing Library (for python's lxml) |
|
| libxslt1 | libxslt1-dev |
XSLT library (for python's lxml) |
|
| PIL | python-imaging |
This is not strictly necessary as setup.py will install it. However, a PyPI-installed copy of PIL will not work out of the box on a Debian/Ubuntu install because it will have trouble finding the C libraries for JPEG / PNG etc. |
| Dependency | Version | Ubuntu Package(s) | Description |
|---|---|---|---|
| Git | git-core |
reddit code is stored in Git. | |
| GCC | gcc |
Used for compiling python modules etc. | |
| optipng | optipng |
Used to compress auto-generated CSS spritemap and thumbnails. | |
| jpegoptim | jpegoptim |
Used to compress thumbnails. | |
| psql | postgresql-client |
CLI client for managing PostgreSQL. Used by some processing jobs. | |
| make | make |
Build tool. | |
| gettext | gettext |
Tools for internationalization. | |
| node.js | 0.6.19+ |
nodejs (reddit ppa) |
Javascript environment. |
| less.js | 1.4+ |
node-less (reddit ppa) |
CSS Precompiler. |
| uglify.js | 1.3+ |
node-uglify (reddit ppa) |
Javascript compression |