Advanced Configuration in Ruby

Ruby agent configuration

You can configure the Sqreen Ruby agent with settings in a configuration file, or with environment variables. This page describes the configuration options available for the Ruby agent.

Configuration methods and precedence

The default method to configure the Sqreen Ruby agent is through the configuration file sqreen.yml in the config directory.

You can also configure most options with environment variables. Here are the order of precedence for configuration:

  1. Environment variables
  2. Configuration file sqreen.yml
  3. Default configuration options

Environment variables override the settings in the sqreen.yml configuration file. The configuration file settings override the agent default options.

Edit configuration file options

The Ruby agent configuration file sqreen.yml uses a standard yaml format. As in Ruby on Rails, you can use ERB inside sqreen.yml

The most important configuration option is the Sqreen token, used to identify the application on Sqreen. Options are listed below.

YAML indentation

When you edit the config file, be sure to indent only with two spaces. If you do not indent correctly, the Sqreen agent will throw an error at Startup ("Unable to parse configuration file")

Deploying Sqreen configuration

Configuration file should be deployed on the servers running Sqreen

Sqreen settings can be optionally adjusted according to your needs. This section lists the possible configuration options you have with Sqreen Ruby agent.

Setting up the path of the configuration file

You can use a specific path for the configuration file using SQREEN_CONFIG_FILE environment variable:

export SQREEN_CONFIG_FILE=/custom/path/sqreen.yml 

Configuration variables

The Sqreen agent can be configured using environment variables or a YAML file. Here are the settings that can be changed:

Variable name Role YAML key name Default value Allowed values
SQREEN_TOKEN The Sqreen token. This identifies the agent to Sqreen backend servers token Empty String
SQREEN_CONFIG_FILE Custom location for the YAML based config Empty String
SQREEN_LOG_LOCATION Specify a custom file to write Sqreen logs log_location log/sqreen.log String
SQREEN_REPORT_PERF Report overhead for each request in the log (WARN level) report_perf false (disabled) Boolean
SQREEN_REPORT_PERF_NR Report overhead for each request to NewRelic as custom transaction attributes report_perf_newrelic 0 (disabled) 0 (disabled), 1 (global overhead), 2 (report duration for each protection category)
SQREEN_DISABLE Prevent the Sqreen agent from starting. Any value in this environment variable will disable Sqreen. disable false (Sqreen is enabled) Boolean

Multiple Rails environments

The Sqreen token is the only required setting. The YAML configuration also supports using a different section per Rails environment:

token: mysecrettoken #general configuration

    token:  mysecretproductiontoken # override general configuration