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Re: Questions Cache-digest

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On Wed, 20 Jul 2011 10:48:16 -0300, igor rocha wrote:
Helo,
I have many doubts about the operation and monitoring Cahe-digests.

I do not know how to access the summaries created by the same, as I do?!

 http://$visible_hostname/squid-internal-periodic/store_digest

Its a compacted binary hash, so all you find out by requesting it is whether the peer is providing it, and maybe when it was Last-Modified.


I do not know how to ensure that all cache servers are utilising and
swapping the summary cache_digests between them , is need  a tag
referencing she?

You will see HTTP requests for the URL above being made between them. From each squid to each of its peers for their individual digest.


The cache-digests is only an information exchange protocol between the
caches that have to be used with a architecture of a squid (mesh,
hierarquic, multicast)?

It is a compressed form of the cache index hashes. The format and construction is publicly available so there is nothing preventing other cache software from providing digests which Squid can fetch. There are also several caching softwares based on Squid which contain it.


Looking at my scenario,  you can point my errors.
RAM
#cache_mem 16 MB
cache_mem 128 MB
maximum_object_size_in_memory 64 KB
# HD
#cache_dir aufs /var/spool/squid 512 16 256
cache_dir aufs /var/spool/squid 512 16 256
#maximum_object_size 128 MB
maximum_object_size 16 MB
minimum_object_size 0 KB
# Cache Threshold limits
cache_swap_low 90
cache_swap_high 100
#log_icp_queries on
# Scenario 4. cache_didests
#cache_peer 192.168.15.200 parent 3128 3130 roun-robin
cache_peer 192.168.15.201 parent 3128 3130 digest-url= 192.168.15.200
192.168.15.202 192.168.15.203

Only set digest URL if it is an unusual location (ie not the URL I mentioned up above).

Also " 192.168.15.200 192.168.15.201 192.168.15.203" is not a URL.

I think you need to remove the whole attempt at configuring digest-url option from the cache_peer lines. The defaults should work.


cache_peer 192.168.15.202 parent 3128 3130 digest-url= 192.168.15.200
192.168.15.201 192.168.15.203
cache_peer 192.168.15.203 parent 3128 3130 digest-url= 192.168.15.200
192.168.15201 192.168.15.202

#Tags cache-digest
digest_generation on
digest_bits_per_entry 5
digest_rebuild_period 3600
digest_rewrite_period 3600
digest_rebuild_chunk_percentage 10
digest_swapout_chunk_size 4096  bytes

<snip>

Amos


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