All settings (see _DEFAULTS[] for default values) are listed here:

It is preferred to adjust tt-rss global configuration through the environment (e.g. using your Docker .env file):

# Copy this file to .env before building the container.
# Put any local modifications here.

TTRSS_SESSION_COOKIE_LIFETIME=2592000

Alternatively, you can create config.php in tt-rss root directory (copied from config.php-dist), using the following syntax:

putenv('TTRSS_DB_HOST=myserver');
putenv('TTRSS_SESSION_COOKIE_LIFETIME='.(86400*30));
  • Note lack of quotes around values.
  • Options should be always prefixed by TTRSS_.
  • Don’t modify classes/config.php.
  • You don’t need to put everything to config.php, only the options which you’ve changed from the defaults.

Legacy plugin-required constants also go to config.php, using define():

define('LEGACY_CONSTANT',-'value');

To set computed values via putenv() you have to get them evaluated by PHP, this would work:

putenv('TTRSS_SESSION_COOKIE_LIFETIME='.(86400*30));

However, these won’t give you expected results:

putenv("TTRSS_SESSION_COOKIE_LIFETIME='2592000'");
// => 0, because quoted '2592000' is an invalid number

putenv('TTRSS_SESSION_COOKIE_LIFETIME=86400*30');
// => 86400, right side expression is not evaluated,
// instead you're casting string literal "86400*30" to an integer

All values should be precalculated when setting via .env because they are not evaluated by PHP and used as-is.

Minimal config.php for a non-Docker setup

Should have at least these options defined:

<?php

putenv('TTRSS_DB_HOST=patroni.example.com');
putenv('TTRSS_DB_USER=mydbuser');
putenv('TTRSS_DB_PASS=mydbpass');
putenv('TTRSS_DB_PORT=5432');
putenv('TTRSS_SELF_URL_PATH=http://example.com/tt-rss/'); # fully-qualified URL of your tt-rss install
putenv('TTRSS_PHP_EXECUTABLE=/path/to/php-cli-binary'); # normally something like /usr/bin/php

Migrating from old style config.php

For any config.php settings you have changed from the defaults (normally this is the DB_ group of settings and SELF_URL_PATH, replace as follows, using the rules above:

define('DB_PORT', 'xxx') → putenv('TTRSS_DB_PORT=xxx').

You can safely omit any settings that were at default values.