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Multisites

Domain mapping config file

For WordPress multisite environments on VIP, data syncs require a domain mapping config file to exist in the application’s GitHub repository. The settings in the domain mapping config file provide values for a search and replace to occur and correctly update the domain values for each network site in the synced database.

Domain mapping config file location

Domain mapping config files must be located in the /config/ directory of a code repository, in the branch that deploys to the production environment (usually master).

If the target environment for the data sync does not yet have a domain mapping config file, the error message “Missing .vip.yml.config” will appear on the Sync section of the VIP Dashboard.

Click on the “.vip.yml.config” link to create an automated blank config file for the environment in the application’s GitHub repository.

The root of a master branch with added domain mapping config files should have a structure similar to this example:

|-- client-mu-plugins/
|-- config/
|----- .vip.example.develop.yml
|----- .vip.example.preprod.yml
|-- images/
|-- languages/
|-- plugins/
|-- themes/
|-- vip-config/

File naming

It is possible to have multiple applications or environments using the same GitHub repository. Each of them will need a unique domain mapping config file. A specific naming convention for domain mapping config files is required for the data sync process to correctly identify the intended application and environment:
.vip.[app].[environment].yml

In this file naming convention:

  • [app] is the name/slug used to identify the (production) application.
  • [environment] is the environment that this config file applies to.

For example, a file named .vip.example.develop.yml would be used for syncing data to the “example” application’s “develop” environment.

In some (very rare) circumstances, multiple environments may be using the same environment name (e.g. multiple develop environments). In this case, a unique naming convention can be appended to the non-production environment config:
.vip.[app].[environment].[child].yml

An example of this file naming convention:
.vip.example.develop.instance-01.yml

Structure

Setting up the domain mapping config file with the correct values and structure is essential for the data sync process to work as expected.

  • YAML-based config files require spaces for indents, and indents are critical to YAML syntax. VIP recommends using two spaces for indents.
  • Multisite environments can use a combination of domain values for network sites such as convenience names, custom domains, subdomains and subdirectories. For a successful data sync, the value added to the domain mapping config file for a network site must match the exact domain value set for that site, both for the origin environment and the destination environment.
  • If a network site is set to a domain value that includes a www prefix, the domain in the configuration file for that site must also include www. If www is redirected to a non-www URL, then configure the sync without www.

An example of the basic structure of a YAML domain mapping config file:

data_sync:
  domain_map:
    prod-url-1: nonprod-url-1
    prod-url-2: nonprod-url-2

Domain mapping config file example #1

To sync data from a production environment that has two sites on its network set to the following domains:

  1. en.example.com
  2. fr.example.com

To a non-production environment that has two corresponding network sites set to the following domains:

  1. en-preprod.example.com
  2. fr-preprod.example.com

The following settings would be required for the domain mapping config file:

data_sync:
  domain_map:
    en.example.com: en-preprod.example.com
    fr.example.com: fr-preprod.example.com

When data sync runs, all instances of en.example.com will be replaced with en-preprod.example.com and all instances of fr.example.com will be replaced with fr-preprod.example.com.

Domain mapping config file example #2

A third network site is added to the production site used in the previous example with the subdirectory domain structure: example.com/translate.

A third network site is also added to the non-production site:
preprod.example.com/translate.

The domain mapping config file will then need to be updated to:

data_sync:
  domain_map:
    en.example.com: en-preprod.example.com
    fr.example.com: fr-preprod.example.com
    example.com/translate: preprod.example.com/translate

Maintenance

Updates must be made to domain mapping config files when domains for network sites are added, removed, or modified across any of the environments.

Last updated: July 19, 2022