Migration from 4.1 vcl
dridi at varni.sh
Wed Oct 9 15:53:00 UTC 2019
> > Probably mostly third-party VMODs, since Varnish 6.x still supports
> > the VCL 4.0 syntax.
> Any specific info on migration of vmods?
> I mostly use the "bundled" vmods, but occasionally others like libvmod-sqlite3.
> If I wanted to convert or upgrade them, do you have any hints or info on what is likely to break and why?
> Can these vmods still be built in the same way with 6.0?
The problem with third-party VMODs is that we don't control them, so
if some idiot  decides to change a VMOD's API then VCL making use
of it will need some amount of rewriting when upgrading. You shouldn't
have a problem with bundled VMODs, otherwise we made a mistake.
When it comes to third-party VMODS an upgrade from Varnish 4.1 to 6.x
needs to be studied on a case-by-case basis. Worst case scenario the
module is not even available for the Varnish version you with to
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