Title: Onartline Multisite Domain Mapping Author: onartline Published: July 31, 2026 Last modified: July 31, 2026 --- Search plugins ![](https://ps.w.org/onartline-multisite-domain-mapping/assets/banner-772x250.png? rev=3630157) ![](https://ps.w.org/onartline-multisite-domain-mapping/assets/icon-256x256.png? rev=3630157) # Onartline Multisite Domain Mapping By [onartline](https://profiles.wordpress.org/onartline/) [Download](https://downloads.wordpress.org/plugin/onartline-multisite-domain-mapping.1.0.0.zip) * [Details](https://wordpress.org/plugins/onartline-multisite-domain-mapping/#description) * [Reviews](https://wordpress.org/plugins/onartline-multisite-domain-mapping/#reviews) * [Installation](https://wordpress.org/plugins/onartline-multisite-domain-mapping/#installation) * [Development](https://wordpress.org/plugins/onartline-multisite-domain-mapping/#developers) [Support](https://wordpress.org/support/plugin/onartline-multisite-domain-mapping/) ## Description Onartline Multisite Domain Mapping allows you to map any domain to a site in your WordPress Multisite network. It is lightweight, easy to configure, and designed for both beginners and experienced administrators. **Features:** – Map multiple domains to any site in your network – Set a primary domain with automatic redirect – Force HTTPS per domain or globally – 301-redirect support for non-primary domains – DNS information display for site administrators– Site-level domain management (optional, controlled by Super Admin) **Requirements:** – PHP 8.3 or higher – WordPress 7.0 or higher – WordPress Multisite installation ## Screenshots [⌊Add Domain – form for creating new domain mappings⌉⌊Add Domain – form for creating new domain mappings⌉[ Add Domain – form for creating new domain mappings [⌊Domain Mapping Overview – manage all mapped domains⌉⌊Domain Mapping Overview – manage all mapped domains⌉[ Domain Mapping Overview – manage all mapped domains [⌊Domain Mapping Settings – HTTPS, redirects and DNS information⌉⌊Domain Mapping Settings – HTTPS, redirects and DNS information⌉[ Domain Mapping Settings – HTTPS, redirects and DNS information ## Installation **Important – Please Read Before Installing** This plugin is recommended for **new WordPress Multisite network installations**. Installing Onartline Multisite Domain Mapping on an **already existing, active Multisite network is not recommended** and is done entirely at your own risk. It may interfere with existing domain configurations, redirects, or other plugins that handle similar functionality. If you already run a Multisite network and want to use this plugin, it is strongly recommended to set up a **fresh, new Multisite installation** first, and then ** migrate or import your existing content and data** into that new installation – rather than adding this plugin to your current, active network. #### 1. Upload the Plugin Upload the `onartline-multisite-domain-mapping` folder to `/wp-content/plugins/` or install it directly via the WordPress Network Admin under **Plugins Add New**. #### 2. Activate the Plugin Activate the plugin via **Network Admin Plugins Network Activate**. #### 3. Set Up sunrise.php Onartline Multisite Domain Mapping requires `sunrise.php` to be loaded before WordPress initializes. **Automatic installation:** If `wp-content/` is writable, the plugin copies `sunrise. php` automatically on activation. You will see a success notice in the Network Admin. **Manual installation:** If the automatic copy fails, copy `sunrise.php` manually: 1. Copy `sunrise.php` from the plugin folder to `/wp-content/sunrise.php` 2. Add the following line to your `wp-config.php` – directly before `require_once ABSPATH . 'wp-settings.php';`: 3. define( ‘SUNRISE’, true ); #### 4. Configure wp-config.php Make sure the following line is present in your `wp-config.php`: ``` define( 'SUNRISE', true ); ``` #### 5. ⚠️ Plesk Users – Disable “Preferred Domain” If your server runs Plesk, you **must** disable the “Preferred Domain” setting for each domain you want to map. Otherwise Plesk will intercept the redirect before WordPress can handle it, causing redirect loops or broken mappings. 1. Log in to Plesk 2. Go to **Websites & Domains your domain Hosting Settings** 3. Set **Preferred Domain** to **None** 4. Save the settings #### 6. Add Your First Domain Mapping 1. Go to **Network Admin Domain Mapping Add Domain** 2. Select the target site 3. Enter the domain (without `http://` or `https://`) 4. Optionally set it as Primary Domain and enable HTTPS 5. Save #### 7. Configure DNS Point your domain to your server by setting the following DNS records: * **A Record** – Name: `@` – Value: Your server IP address * **CNAME Record** – Name: `www` – Value: Your primary domain or server CNAME The required values are displayed in **Network Admin Domain Mapping Settings**. #### 8. Uninstallation When you deactivate and delete Onartline Multisite Domain Mapping via **Network Admin Plugins**, the plugin automatically removes: * The plugin files * The `sunrise.php` file from `/wp-content/` * The database tables (only if “Delete data on uninstall” was enabled in the plugin settings) **Important – Manual step required** The plugin **cannot automatically remove** the following line from your `wp-config. php`: ``` define( 'SUNRISE', true ); ``` This line was added manually during installation and must also be **removed manually** after uninstalling the plugin. If this line remains in `wp-config.php` after `sunrise. php` has been deleted, WordPress will try to load a file that no longer exists, resulting in warnings such as: ``` Warning: include_once(.../wp-content/sunrise.php): Failed to open stream: No such file or directory ``` and potentially `headers already sent` errors on the login page or elsewhere. **To fix this:** Open your `wp-config.php` and remove (or comment out) the line ` define( 'SUNRISE', true );`, then save the file. ## FAQ ### Can I install this plugin on an existing, active Multisite network? This is not recommended and would be done entirely at your own risk. Onartline Multisite Domain Mapping is designed for new Multisite installations. If you already run an active Multisite network, it is strongly recommended to set up a fresh installation first and migrate your existing content into it, rather than adding this plugin to your current network. Please see the note at the beginning of the **Installation** section for details and our recommended approach. ### The domain redirects in a loop – what should I do? Check if Plesk “Preferred Domain” is set. Set it to “None”. Also verify that `define(' SUNRISE', true );` is present in `wp-config.php`. If you are using the plugin’s 301-redirect feature, check the hosting settings for the specific domain (e.g. in Plesk, cPanel, or other hosting panels) and disable any existing redirect rules there if necessary. If 301 redirects are already configured at the hosting level for that domain and you want to keep them, disable the 301-redirect option in the plugin settings instead– otherwise a redirect loop will occur. ### sunrise.php was not copied automatically – what now? Copy `sunrise.php` manually from the plugin folder to `/wp-content/sunrise.php` and add `define( 'SUNRISE', true );` to your `wp-config.php`. ### The plugin is not working on my Website – why? Onartline Multisite Domain Mapping requires a WordPress Multisite installation and PHP 8.3+. Single-site installations are not supported. ### Can site administrators manage their own domains? Yes – the Super Admin can enable this under **Network Admin Domain Mapping Settings Site-Admin Domain Mapping**. ### Does the plugin support automatic updates? Yes – once published on the WordPress plugin repository, automatic updates are fully supported. ### I uninstalled the plugin, but now I see errors about sunrise.php or “headers already sent” – what happened? This happens if the line `define( 'SUNRISE', true );` was not removed from `wp-config. php` after uninstalling the plugin. Since `sunrise.php` no longer exists after uninstallation, WordPress fails when trying to load it. Simply remove that line from `wp-config. php` to resolve the issue. ## Reviews There are no reviews for this plugin. ## Contributors & Developers “Onartline Multisite Domain Mapping” is open source software. The following people have contributed to this plugin. Contributors * [ onartline ](https://profiles.wordpress.org/onartline/) [Translate “Onartline Multisite Domain Mapping” into your language.](https://translate.wordpress.org/projects/wp-plugins/onartline-multisite-domain-mapping) ### Interested in development? [Browse the code](https://plugins.trac.wordpress.org/browser/onartline-multisite-domain-mapping/), check out the [SVN repository](https://plugins.svn.wordpress.org/onartline-multisite-domain-mapping/), or subscribe to the [development log](https://plugins.trac.wordpress.org/log/onartline-multisite-domain-mapping/) by [RSS](https://plugins.trac.wordpress.org/log/onartline-multisite-domain-mapping/?limit=100&mode=stop_on_copy&format=rss). ## Changelog #### 1.0.0 * Initial release ## Meta * Version **1.0.0** * Last updated **9 hours ago** * Active installations **Fewer than 10** * WordPress version ** 7.0 or higher ** * Tested up to **7.0.2** * PHP version ** 8.3 or higher ** * Tags * [custom domain](https://wordpress.org/plugins/tags/custom-domain/)[domain mapping](https://wordpress.org/plugins/tags/domain-mapping/) [multisite](https://wordpress.org/plugins/tags/multisite/)[network](https://wordpress.org/plugins/tags/network/) * [Advanced View](https://wordpress.org/plugins/onartline-multisite-domain-mapping/advanced/) ## Ratings No reviews have been submitted yet. [Your review](https://wordpress.org/support/plugin/onartline-multisite-domain-mapping/reviews/#new-post) [See all reviews](https://wordpress.org/support/plugin/onartline-multisite-domain-mapping/reviews/) ## Contributors * [ onartline ](https://profiles.wordpress.org/onartline/) ## Support Got something to say? Need help? [View support forum](https://wordpress.org/support/plugin/onartline-multisite-domain-mapping/) ## Donate Would you like to support the advancement of this plugin? [ Donate to this plugin ](https://paypal.me/onartline)