Hi
On 6/12/18 12:03 AM, Andrei wrote:
- The sheer amount of added context switches (proxying was done local on
a cPanel box, seeing 20-30k reqs/sec during peak hours)
Not clear what you mean here
- Having to manage two software versions, configs, auto config builders
used by internal tools, etc
Not a huge headache here. I can see this gets possibly annoying a scale
with # of sites.
- More added headaches with central logging
Having Varnish's detailed logging is a bit plus, IME, for tracking down
cache issues, specifically, and header issues in general.
No issues with 'central' logging.
- No projected TLS support in Varnish
Having a terminator out front hasn't been a problem, save for the
additional config considerations.
- Bare minimum H2 support in Varnish vs a more mature implementation in
Nginx
This one I'm somewhat aware of -- haven't yet convinced myself of
if/where there's a really problematic bottleneck.
Since Nginx can pretty much do everything Varnish does, and more,
Except for the richness of the VCL ...
I decided to avoid the headaches and just jump over to Nginx (even though
I've been an avid Varnish fan since 2.1.5). As for a VCL replacement and
purging in Nginx, I suggest reading up on Lua and checking out openresty
if you want streamlined updates and don't want to manually
compile/manage modules. To avoid overloading the filesystem with added
I/O from purge requests/scans/etc, I wrote a simple Perl script that
handles all the PURGE requests in order to have regex support and
control over the remoals (it basically validates ownership to purge on
the related domain, queues removals, then has another thread for the
cleanup).
My main problem so far is that WordPress appears to be generally
Varnish-UNfriendly.
Not core, but plugins. With Varnish, I'm having all SORTS of
issues/artifacts cropping up. So far, (my) VCL pass exceptions haven't
been sufficient.
Without Varnish, there are far fewer 'surprises'.
Then again, I'm not a huge WP fan to begin with; it's a pain to debug
anything beyond standard server config issues. Caching in particular.
OTOH, my sites with Nginx+Varnish+Varnish with Symfony work without a hitch.
My leaning is, for WP, Nginx only. For SF, Nginx+Varnish. And, TBH,
avoiding WP if/when I can.
Hope this helps some :)
It does, thx!
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