[squid-users] Enable caching

[Andrey K]

Hello, Alex,

Thank you very much!

Kind regards,
      Ankor

чт, 22 июн. 2023 г. в 05:23, Alex Rousskov <rousskov at measurement-factory.com
>:

> On 4/5/23 09:27, Alex Rousskov wrote:
> > On 4/5/23 06:07, Andrey K wrote:
> >
> >> Previously, caching was disabled on our proxy servers. Now we need to
> >> cache some content (files about 10 MB in size).
> >> So we changed the squid.conf:
> >
> >> cache_dir ufs /data/squid/cache 32000 16 256 max-size=12000000
> >>
> >> We have 24 workers on each proxy.
> >
> > UFS-based cache_dirs are not supported in multi-worker configurations
> > and, in most cases, should not be used in such configurations. The
> > combination will violate basic HTTP caching rules and may crash Squid
> > and/or corrupt responses.
> >
> >
> >> We saw that some requests were taken from the cache, and some were not.
> >> The documentation says:
> >> "In SMP configurations, cache_dir must not precede the workers option
> >> and should use configuration macros or conditionals to give each
> >> worker interested in disk caching a dedicated cache directory."
> >
> > The official documentation quoted above is stale and very misleading in
> > modern Squids. Ignore it. I will try to find the time to post a PR to
> > fix this.
>
> Done at https://github.com/squid-cache/squid/pull/1394
>
> Alex.
>
>
>
> >> So we switched to a rock cache_dir:
> >> cache_dir rock /data/squid/cache 32000 max-size=12000000
> >>
> >> Now everything seems to be working fine in the test environment, but I
> >> found limitations on the RockStore
> >> (https://wiki.squid-cache.org/Features/RockStore:
> >> "Objects larger than 32,000 bytes cannot be cached when cache_dirs are
> >> shared among workers."
> >
> > The Feature/RockStore page is stale and can easily mislead. In general,
> > Feature/Foo wiki pages are often development-focused and get stale with
> > time. They cannot be reliably used as a Squid feature documentation.
> >
> >
> >> Does this mean that RockStore is not suitable for caching large files?
> >
> > No, it does not. Rock storage has evolved since that Feature page was
> > written. You can see the following wiki page discussing evolved rock
> > storage design, but that page probably has some stale info as well:
> > https://wiki.squid-cache.org/Features/LargeRockStore
> >
> >
> >> Should I switch back to the UFS and configure 24 cache_dirs
> >
> > If everything is "working fine", then you should not. Otherwise, I
> > recommend discussing specific problems before switching to that
> > unsupported and dangerous hack.
>
>
>
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