Creating Drupal 7 installation profile https://www.drupal.org/node/1022020

my_bootstrap.install

<?php
/**
 * Implement hook_install().
 *
 * Perform actions to set up the site for this profile.
 */
function my_bootstrap_install() {
  include_once DRUPAL_ROOT . '/profiles/minimal/minimal.install';
  minimal_install();
  
  /* Enable Ember Admin Theme */
  variable_set('admin_theme', 'ember');
  
  /* Disable Toolbar in favor of Navbar */
  module_disable(array("toolbar","overlay"));
  
	/* Set cron to run each hour */
	variable_set('cron_safe_threshold', "3600");
	
	/* Set higher limit on log messages to keep */
	variable_set('dblog_row_limit', "1000000");
	
	/* Set cache lifetime to 30 minutes */
	variable_set('cache_lifetime', "1800");
	variable_set('page_cache_maximum_age', "1800");
}
?>