Migrating from old versions

Migrating from old versions ¶ This page is a continuous work in progress, and contributions to it are welcome. Do not hesitate to open a pull request . Upgrading should be easy ¶ First and foremost, we make every effort to keep upgrades as seamless as possible. A long time ago, a big change happened between Varnish Cache 3.x and 4.x, which forced many users to rewrite large parts of their VCL, and we have since been careful to not demand huge changes again. That said, we want to keep Vinyl Cache great, and