delivery.rb Settings

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The delivery.rb file, located at /etc/delivery/delivery.rb, contains all of the non-default configuration settings used by the Chef Automate. (The default settings are built-in to the Chef Automate configuration and should only be added to the delivery.rb file to apply non-default values.) These configuration settings are processed when the delivery-server-ctl reconfigure command is run, such as immediately after setting up Chef Automate or after making a change to the underlying configuration settings after the server has been deployed. The delivery.rb file is a Ruby file, which means that conditional statements can be used in the configuration file.

Recommended Settings

The following settings are typically added to the server configuration file, including:

• Logging directories
• Maximum file sizes at which log rotation occurs
• The number of log files to keep

These values have the same default across all Chef Automate services, but individual services can have their values overwritten. Add the service-specific values to the delivery.rb file. The list of services delivery starts which include logging can be determined by looking in the node['delivery']['log_directory'] directory.

<service_name>['log_directory']

The directory in which log data is stored. The default value is the recommended value. Default value: /var/log/delivery/<service_name>.

<service_name>['log_rotation']['file_maxbytes']

The log rotation policy for this service. Log files are rotated when they exceed file_maxbytes. The maximum number of log files in the rotation is defined by num_to_keep. Default value: 100 * 1024 * 1024 (100MB).

<service_name>['log_rotation']['num_to_keep']

The log rotation policy for this service. Log files are rotated when they exceed file_maxbytes. The maximum number of log files in the rotation is defined by num_to_keep. Default value: 10.

SSL Protocols

The following settings are often modified from the default as part of the tuning effort for the nginx service and to configure the Chef Automate server to use SSL certificates:

delivery['ssl_certificates']

A hash of SSL certificate files to use for FQDNs. Uses remote_file to download the key and certificate specified to the standard location of /var/opt/delivery/nginx/ca and replaces the contents of any file found there using the name delivery.example.com.crt or delivery.example.com.key. If the content in the new custom certificate and key files and the original files match, these files are not reconfigured. To use a pre-generated SSL certificate for the main FQDN (delivery_fqdn), follow this example:

delivery['ssl_certificates'] = {
  'delivery.example.com' => {
    'key' => 'file:///etc/ssl_certificates/delivery.example.com.key',
    'crt' => 'file:///etc/ssl_certificates/delivery.example.com.crt'
  }
}

nginx['ssl_ciphers']

The list of supported cipher suites that are used to establish a secure connection. To favor AES256 with ECDHE forward security, drop the RC4-SHA:RC4-MD5:RC4:RSA prefix. See this link for more information. Default value:

"RC4-SHA:RC4-MD5:RC4:RSA:HIGH:MEDIUM:!LOW:!kEDH:!aNULL:!ADH:!eNULL:!EXP:!SSLv2:!SEED:!CAMELLIA:!PSK"

nginx['ssl_protocols']

The SSL protocol versions that are enabled. For the highest possible security, disable SSL 3.0 and allow only TLS:

nginx['ssl_protocols'] = 'TLSv1 TLSv1.1 TLSv1.2'

Default value: Default value: "SSLv3 TLSv1".

For example, after copying the SSL certificate files to the Chef Automate server, update the delivery['ssl_certificates'] hash settings to specify the paths to those files, and then (optionally) update the nginx['ssl_ciphers'] and nginx['ssl_protocols'] settings to reflect the desired level of hardness for the Chef Automate server:

delivery['ssl_certificates'] = {
   'delivery.example.com' => {
      'key' => 'file:///etc/ssl_certificates/delivery.example.com.key',
      'crt' => 'file:///etc/ssl_certificates/delivery.example.com.crt'
   }
}
nginx['ssl_ciphers'] = "HIGH:MEDIUM:!LOW:!kEDH:!aNULL:!ADH:!eNULL:!EXP:!SSLv2:!SEED:!CAMELLIA:!PSK"
nginx['ssl_protocols'] = "TLSv1 TLSv1.1 TLSv1.2"

Proxy Settings

If you wish to operate your Chef Automate server from behind a proxy, you may specify you proxy host name and configuration using these options.

delivery['proxy']['host']

The hostname to your proxy server such as foo.bar.com or 192.0.2.00.

delivery['proxy']['port']

The port to connect on. This will be used for all connections (http and https).

delivery['proxy']['user']

Optional authentication user name when contacting the proxy server.

delivery['proxy']['password']

Optional authentication password when contacting the proxy server.

delivery['proxy']['no_proxy']

A list of hostnames that are blacklisted from using the proxy. Chef Automate will attempt to connect directly to these hosts. By default, this is set to ["localhost", "127.0.0.1"].

Optional Settings

Additional settings are available for performance tuning of the Chef Automate server.

delivery-server-ctl reconfigure