This is a description in general terms how to upgrade to newer versions of Varnish Cache Plus.
Many (most) of the changes needed will be identical to a Varnish Cache upgrade, so the open-source documentation is referenced below.
These instructions are not meant to be copied verbatim, but rather give an indication of the considerations and steps necessary when upgrading.
Support can help out with VCL configuration changes between versions.
Upgrades between minor versions, for example from
considered stable and will not require manual intervention.
Upgrading from 4.1 should be straight forward, but there are some important changes that might force you the update your VCL and settings. Read more about this on Configuration and VCL changes when upgrading from Varnish Cache Plus 4.1 to 6.0.
4.1 are usually straight forward.
Before the upgrade the list of supported platforms should be reviewed.
On Enterprise Linux:
mv /etc/yum.repos.d/varnish-4.0-plus.repo /etc/yum.repos.d/varnish-4.1-plus.repo sed -i -e 's|4.0-plus|4.1-plus' /etc/yum.repos.d/varnish-4.1-plus.repo yum clean metadata yum update varnish-plus
On Ubuntu 14.04 LTS (trusty):
mv /etc/apt/sources.list.d/varnish-4.0-plus.list /etc/apt/sources.list.d/varnish-4.1-plus.list sed -i -e 's|4.0-plus|4.1-plus' /etc/apt/sources.list.d/varnish-4.1-plus.list apt-get update apt-get upgrade varnish-plus
On all platforms the
varnish-plus-vmods package has been retired. Modules
are now embedded in the main
varnish-plus-vmods-extra package is still available.
VCL code only requires minimal changes, see the Varnish Cache page on this topic.
4.0 there were significant changes to VCL, which
made the transition more difficult than was expected.
Main upgrade documentation can be found online: https://www.varnish-cache.org/docs/4.0/whats-new/upgrading.html
The most common substitutions can be done automatically using the Varnish 3 to 4 script.