Setup

Reporting is a commercial Graylog feature that can be installed in addition to the Graylog open source server.

Installation

Reporting is part of the Graylog Enterprise plugin, please check the Graylog Enterprise setup page for details on how to install it.

The PDF generation needs the fontconfig package installed on the server it is running on.

On a Debian based system use apt to install it, e.g.:

$ sudo apt-get install fontconfig

Respectively on a RedHat based systems use:

$ sudo yum install fontconfig

Configuration

In most cases you can use the Reporting functionality without making any changes to your Graylog configuration file (check the default file locations page to see where you can find it). Below, you will find all available configuration options in case you need to do some advanced configuration.

Configuration Options

Name

Description

bin_dir

Directory with binaries needed for PDF generation.

data_dir

Cache directory for PDF generation.

report_disable_sandbox

Disables report generation sandbox.

report_generation_timeout_seconds

Timeout in seconds to wait for a report generation.

report_user

Internal user to generate reports.

report_render_uri

URI to connect to Graylog Web Interface.

report_render_engine_port

Port to communicate with background process.

bin_dir

Default value: bin - relative to Graylog working directory

The default distribution comes with two binaries needed for PDF generation ‘headless_shell’ and ‘chromedriver’. These binaries are usually located in /usr/share/graylog-server/bin.

data_dir

Default value: data - relative to Graylog working directory

The PDF generation happens on disk in the first place so Graylog needs a place to write out temporary files. The system packages create /var/lib/graylog-server for this purpose. Make sure this directory is correctly configured and read-, and writable for the Graylog Server user.

report_disable_sandbox

Default value: false.

To ensure the maximum security in your system, the reporting generation process runs inside a sandbox, which provides a restricted environment for the application. That sandbox can only be used when the process is executed as a normal user, as the root user has special administrative privileges that could grant a potential attacker full access to your system.

We recommend leaving this configuration option set to false.

Unfortunately, there are two scenarios where the security features provided by the sandbox cannot be used:

  • Environments where you want or must use the root user to run reporting generation.

  • Environments that provide limited kernel capabilities. On the one hand Docker containers limit the kernel capabilities in a way that sandboxing doesn’t work. On the other hand some RedHat/CentOS based systems come with older kernel versions which also lack the necessary capabilities. Systems with a kernel version >= 4.x should be fine for the default settings.

In case your Graylog server runs in one of those scenarios, you may consider disabling the sandbox.

Please note that this option only affects the reporting generation process, not the Graylog server.

report_generation_timeout_seconds

Default value: 180.

Time in seconds to wait for a report to load in the background.

To ensure all widgets in your report have time to fetch their data and load, Graylog will wait up to the value set to this configuration option. When a report takes longer than that to load, the report generation will fail and Graylog will log the error in its logs.

In case reports in your Graylog setup are not being generated and the server displays a timeout error, you may need to increase this value.

report_user

Default value: graylog-report.

Graylog user that will be used internally to generate reports in the background. To ensure the user has access to all required information, this user must have the Report System (Internal) role assigned.

report_render_uri

Default value: $http_publish_uri.

Customize the URI the background process uses to connect to the web interface. By default it uses the value of the http_publish_uri option in your Graylog configuration file.

report_render_engine_port

Default value: 9515.

Customize the port used to communicate with the background process.