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Configuring cron
In order for the site and its modules to continue to operate well, a set of routine administrative operations must run on a regular basis; these operations are known as <em>cron</em> tasks. On the <a href=":cron">Cron page</a>, you can configure cron to run periodically as part of server responses by installing the <em>Automated Cron</em> module, or you can turn this off and trigger cron from an outside process on your web server. You can verify the status of cron tasks by visiting the <a href=":status">Status report page</a>. For more information, see the <a href=":handbook">online documentation for configuring cron jobs</a>.
Configuring the file system
Your site has several file directories, which are used to store and process uploaded and generated files. The <em>public</em> file directory, which is configured in your settings.php file, is the default place for storing uploaded files. Links to files in this directory contain the direct file URL, so when the files are requested, the web server will send them directly without invoking your site code. This means that the files can be downloaded by anyone with the file URL, so requests are not access-controlled but they are efficient. The <em>private</em> file directory, also configured in your settings.php file and ideally located outside the site web root, is access controlled. Links to files in this directory are not direct, so requests to these files are mediated by your site code. This means that your site can check file access permission for each file before deciding to fulfill the request, so the requests are more secure, but less efficient. You should only use the private storage for files that need access control, not for files like your site logo and background images used on every page. The <em>temporary</em> file directory is used internally by your site code for various operations, and is configured on the <a href=":file-system">File system settings</a> page. You can also see the configured public and private file directories on this page, and choose whether public or private should be the default for uploaded files.
Configuring the image toolkit
On the <a href=":toolkit">Image toolkit page</a>, you can select and configure the PHP toolkit used to manipulate images. Depending on which distribution or installation profile you choose when you install your site, the GD2 toolkit and possibly others are included; other toolkits may be provided by contributed modules.
Critical security advisories
The System module displays highly critical and time-sensitive security announcements to site administrators. Some security announcements will be displayed until a critical security update is installed. Announcements that are not associated with a specific release will appear for a fixed period of time. <a href=":handbook">More information on critical security advisories</a>.
Only the most highly critical security announcements will be shown. <a href=":advisories-list">View all security announcements</a>.
Tracking overview
The core History module tracks how recently users have viewed content items, and provides a Views field and filter that can be used to show users content that they haven't yet seen.
If you have one or more tracking modules installed on your site, see the related topics listed below for specific tasks.
Tracking which content a user has visited
What is the configuration system?
The configuration system provides the ability for administrators to customize the site, and to move and synchronize configuration changes between development sites and the live site. It does this in 2 ways:
Providing storage for configuration
Providing a process in which configuration changes can be imported and exported between instances of the same site; for example, from "dev" to "staging" to "live"
What is configuration data?
Configuration data describes settings that define how your site behaves or is displayed. For example, when a site administrator updates settings using an administrative form, these settings are stored as configuration data. Configuration data describes settings as simple as a site name and as complex as a view or image style.
What kinds of configuration are there?
Active configuration
Active configuration is the current working configuration of a site. Storage of active configuration is defined by the site, and resides in the database by default.
A simple configuration item is a group of settings, such as the settings for a module or theme. Each simple configuration item has its own unique structure.
Configuration entities
Configuration entities are user-defined configuration items grouped by type, such as views, image styles, and content types. Each configuration entity within a type has a similar structure.
Default configuration
Default configuration can be defined by a module, theme, or installation profile in its <em>config/install</em> or <em>config/optional</em> directories. Configuration is provided in YAML files (file extension .yml); YAML is a human-readable data serialization standard that is used by the core software for several purposes. Once the default configuration has been imported into the site's active configuration (through installing the extension), that configuration is owned by the site, not the extension. This means that future updates of the extension will not override the site's active configuration for that extension.
What is configuration synchronization?
Configuration synchronization is the process of exporting and importing configuration to keep configuration synchronized between different versions of a site; for example, between a development site and the live site.
Each site has unique identifier, also called a <em>UUID</em>, which identifies the site to the system in any instance of the site, as long as the site instances have been reproduced as clones (cloning is when the codebase and database are copied to create a new site instance). When site instances are cloned, a "dev" instance of the site has the same UUID as the "live" instance. When site instances share the same UUID, configuration can be exported from one instance to another.