Hi,
I am currently facing a problem that I wasn't able to find a
solution for in the mailing list or on the internet,
My squid is dying for 30 seconds every one hour at the same
exact time, squid process will still be running,
I lose my wccp connectivity, the cache peers detect the squid
as a dead sibling, and the squid cannot server any requests
The network connectivity of the sever is not affected (a ping
to the squid's ip doesn't timeout)
Hi,
here is the strace result
-----------------------------------------------------------------------------------------------------
<snip looks perfectly normal traffic, file opening and closing data
reading, DNS lookups and other network read/writes>
read(165, "!", 256) = 1
<snip bunch of other normal traffic>
read(165, "!", 256) = 1
----------------------------------------------------------------------------------------------------------------------------------------------------
Squid is freezing at this point
The 1-byte read on FD #165 seems odd. Particularly suspicious being
just before a pause and only having a constant 256 byte buffer space
available. No ideas what it is yet though.
wccp2_router x.x.x.x
wccp2_forwarding_method l2
wccp2_return_method l2
wccp2_service dynamic x
wccp2_service_info x protocol=tcp flags=src_ip_hash priority=240
ports=80
wccp2_service dynamic x
wccp2_service_info x protocol=tcp flags=dst_ip_hash,ports_source
priority=240 ports=80
wccp2_assignment_method mask
#icp configuration
maximum_icp_query_timeout 30
cache_peer x.x.x.x sibling 3128 3130 proxy-only no-tproxy
cache_peer x.x.x.x sibling 3128 3130 proxy-only no-tproxy
cache_peer x.x.x.x sibling 3128 3130 proxy-only no-tproxy
log_icp_queries off
miss_access allow squidFarm
miss_access deny all
So if I understand this right. You have a layer of proxies defined as
"squidFarm" which client traffic MUST pass through *first* before
they are allowed to fetch MISS requests from this proxy. Yet you are
receiving WCCP traffic directly at this proxy with both NAT and TPROXY?
This miss_access policy seems decidedly odd. Perhapse you can
enlighten me?
Hi,
Let me explain what I am trying to do,(I was hoping that this is the
right setup) the squids are siblings so my clients pass through one
squid only (this squid uses icp to check if the object is in my
network, if not the squid fetches the object from the internet)
if
miss if miss
clients-------->WCCP-------->squid------------->ICP----------->Internet-------->WCCP------->squid-------->clients
I have over 400Mbps of bandwidth, but one squid (3.1) cannot withstand
this kind of bandwidth (number of clients), this is why I have created
a squidFarm
I have the following hardware: i7 xeon 8 cpus - 16GB Ram - 2 HDDs
450GB & 600GB no RAID
Software: Debian OS squeeze 6.0.3 with kernel 2.6.32-5-amd64 and
iptables 1.4.8
Please note that when I only use one cache_dir (the small one
cache_dir aufs /cache1/squid 320000 480 256 ) I don't face this problem
The problem starts when the cache dir size is bigger then 320 GB
Please advise
Thank you for the advise on the refresh patterns
Regards
Elie
Hi Amos,
Thank you for your help, the problem was solved when I replaced the
refresh patterns with what you recommended,
I replaced more then 20 lines of refresh patterns with 4 lines,
One more question, do you recommend a specific replacement policy, I
have read that when the size of cache directory is large, you advise to
leave the default replacement policy,
Please advise,
Thank you,
Elie
