Configuring the Fastly_Cdn Module
This document describes how to configure the Fastly_Cdn module and connect it to Fastly's CDN services.
To proceed with configuration you will need to have signed up for Fastly's service. You will need the API token (https://manage.fastly.com/account/personal/tokens). Details of how to find these are kept in Fastly's documentation.
Configure the Fastly Service
To start configuring the Fastly service for use with Magento ensure that you have signed up for the service. Once you have confirmed the account and logged in the Fastly application will take you to a wizard to configure your first service. This is further documented on Fastly's documentation.
Configure the Module
This section will describe how to input the API token and service ID into the Fastly_Cdn module. It assumes that the module has already been installed without error. If not please see installing the module for details of how to do this.
To enter the credentials for the Fastly_Cdn module, open a browser and log in to the admin section of the Magento server. Navigate to:
Stores > Configuration > Advanced > System
Expand the 'Full Page Cache' section then choose 'Fastly CDN' in the 'Caching Application' dropdown.
Adjust the TTL for public content to suit the needs of the server. (This value is in seconds.)
Expand the 'Fastly Configuration' section to enter the remaining necessary details.
In the 'Fastly Service ID' enter the service ID that was configured when signing up for Fastly's services above and in 'Fastly API token' enter the token. Test your API Token and Service ID pair using the button. If your credentials are valid, you may then automatically upload the Magento VCL to your Fastly service and should activate the version. Make sure to click 'Save Config' at the top of the page and then clear the Magento cache for the changes to take effect.
This is enough to start testing Fastly, but proceed to further configuration to change other settings.
Further Configuration Options
Stale content delivery time
Fastly can serve stale content even if the TTL has expired. During the time it takes Fastly to fetch the fresh content from Magento it can serve stale content from its cache. This setting defines the time in seconds to allow Fastly to serve stale content after the "normal" TTL has expired.
Stale content delivery time in case of backend error
This setting defines the time in seconds that stale content can be delivered in case the backend is down or cannot respond properly.
When enabled, this configures the module to listen for events which clear generated content for a 'category' and ties a cache purge to Fastly with these. Once cleared new content can be fetched and cached thus updating the content.
When enabled, this configures the module to listen for events which clear generated content for a 'product' and ties a cache purge to Fastly with these. Once cleared new content can be fetched and cached thus updating the content.
Additionally, if the "Purge Category" option is set to "Yes" this also triggers the product's categories to be purged on product/product stock update. This option is useful to keep product pages and categories up-to-date when a product becomes out of stock (i.e. when the last item purchased by a customer).
Purge CMS page
This option binds automatic purge of CMS page (Fastly) cache with its update event. If set to "Yes" CMS page cache is invalidated each time CMS page update event occurs (i.e. CMS page content update via Magento admin).
Use Soft Purge
Using soft purge will not remove the content immediately from Fastly's cache but mark it as stale. In combination with the stale timings your customers will be served stale content very fast while Fastly is updating the content in the background.
GeoIP handling will get the country of a web client based on its IP address. This feature can be used to either automatically redirect visitors to the store matching their country or to show them a dialog to select the desired store themselves.
In your Magento2 backend go to Stores -> Configuration -> System in the "Advanced" section and open "Full Page Cache" tab and choose "Yes" with "Enable GeoIP". Make sure to be on store configuration scope.
In the VCL the cookie headers are examined. If either the
form_key cookie are present this Fastly will not take any action as it
presumes the customer either saw (and maybe interacted with) the modal dialog
or was automatically redirected to the matching store. If the form_key cookies
is present the visitor has been browsing around so he shouldn't be disturbed by
dialogs or redirects.
Choose "Dialog" to show a modal dialog to the visitor. This gives him the option to switch to the suggested store based in the GeoIP lookup and the "GeoIP Country Mapping" (see below) or stay on the current frontend. Choose "Redirect" to perform redirect the visitor to an appropriate store view.
GeoIP Country Mapping
For every country you want to map to a specific store you have to enter a country code and select a target store. All country codes use ISO 3166-1-alpha-2 codes. You can use "*" as wildcard to match all country codes.
Prevent redirect or static blocks to be shown
You probably don't want to redirect your customers to another store if the country of your visitor matches the current store. To prevent redirects you have to add a mapping using the country code of that store and leave the other field empty. This way, if your customer is in the "right" store (based on the country), no GeoIP based action will be triggered.
For production ecommerce sites TLS (SSL) is most certainly needed. The options for deploying this are documented in TLS configuration.