Varnish Upgrade

This is a basic guide on the process of upgrading Varnish (this might be required because a new version is required by a Magento upgrade, though we may chose to upgrade Varnish for other reasons).

Requirements

• You need to know the version of Redis you are going to be upgrading to.
• SSH access

Guide

Upgrading Varnish on a development instance

1. Create a new instance.
2. Edit the settings of the instance, set the Varnish version to the one desired. Then click "save" (uncheck the box to sync affected components).
3. Completely recreate the instance. (DONT do this on PROD) (unpushed code and DB changes will be lost)
4. Open ssh and run bin/magento cache:flush
5. Ensure the mdoq/varnish/varnish.vcl is in git. Check if there are any changes to be pushed. If so, this work will need to be released (zero downtime) before the varnish upgrade.
6. You can now test the instance to see if it runs correctly on the updated Varnish.

Upgrading Varnish on production

1. Perform zero downtime release (if required, see step 5 of Upgrading Varnish on a development instance).
2. Select production instance
3. Select settings => Varnish.
4. Enable / change to the appropriate version.
5. Sync, select Varnish. Click "Sync".
6. Once complete check the site.