I have been attempting to setup a squid forward proxy with one frontend and two backends as per configuration example http://wiki.squid-cache.org/ConfigExamples/SmpCarpCluster
My issue is that only the first attempt comes from the cache and then additional requests are downloaded direct by the frontend instead of from the backend caches. I suspect it is due to a detected forwarding loop which shows up in the logs: 2015/10/30 13:07:49.239 kid1| 44,3| peer_select.cc(137) peerSelect: e:=XIWV/0x7f7bfee2e730*2 http://127.0.0.1:40 02/squid-internal-dynamic/netdb 2015/10/30 13:07:49.239 kid1| 20,3| store.cc(466) lock: peerSelect locked key 64AAA11C8DEF57153B10BA2C9D2F3D60 e:=XIWV/0x7f7bfee2e730*3 2015/10/30 13:07:49.240 kid1| 44,3| peer_select.cc(441) peerSelectFoo: GET 127.0.0.1 2015/10/30 13:07:49.240 kid1| 44,3| peer_select.cc(468) peerSelectFoo: peerSelectFoo: direct = DIRECT_YES (forwarding loop detected) 2015/10/30 13:07:49.240 kid1| 44,3| peer_select.cc(477) peerSelectFoo: peerSelectFoo: direct = DIRECT_YES 2015/10/30 13:07:49.240 kid1| 44,2| peer_select.cc(258) peerSelectDnsPaths: Find IP destination for: http://127.0.0.1:4002/squid-internal-dynamic/netdb' via 127.0.0.1 I can force the backend caches to be used successfully with this option "never_direct allow all" however I would like to resolve the underlying issue. I have no iptables configured on this server and have made sure the environment variable http_proxy is not set. Also I have tested this on Squid 3.4.8 and 3.5.10 on Debian. My config is below: #/etc/squid/squid.conf# debug_options = ALL,3 cachemgr_passwd eight22 all acl localnet src 10.1.0.0/16 acl localnet src 10.2.0.0/16 acl localnet src 192.168.0.0/23 acl localnet src fe80::/10 acl squid_servers src 10.1.209.0/24 acl SSL_ports port 443 # https acl SSL_ports port 8443 # Unifi/Non-standard https acl SSL_ports port 5222 # Jabber acl SSL_ports port 10000 # Webmin acl SSL_ports port 10443 # Non-standard https acl SSL_ports port 18080 # PMX acl SSL_ports port 28443 # PMX acl Safe_ports port 80 # http acl Safe_ports port 21 # ftp acl Safe_ports port 443 # https acl Safe_ports port 70 # gopher acl Safe_ports port 210 # wais acl Safe_ports port 1025-65535 # unregistered ports acl Safe_ports port 280 # http-mgmt acl Safe_ports port 488 # gss-http acl Safe_ports port 591 # filemaker acl Safe_ports port 777 # multiling http acl CONNECT method CONNECT http_access deny !Safe_ports http_access deny CONNECT !SSL_ports workers 3 if ${process_number} = 1 include /etc/squid/squid-frontend.conf else include /etc/squid/squid-backend.conf endif http_access deny all refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 refresh_pattern . 0 20% 4320 #/etc/squid/squid-frontend.conf# http_port 3128 http_port 3129 tproxy http_access allow localhost manager http_access deny manager http_access allow localhost http_access allow localnet http_access allow squid_servers htcp_access allow squid_servers htcp_access deny all cache_peer 127.0.0.1 parent 4002 0 carp login=PASS name=backend-kid2 no-query cache_peer 127.0.0.1 parent 4003 0 carp login=PASS name=backend-kid3 no-query prefer_direct off nonhierarchical_direct off memory_replacement_policy heap LRU cache_mem 2048 MB access_log /var/log/squid3/frontend.access.log cache_log /var/log/squid3/frontend.cache.log visible_hostname frontend.cloud.solnet.nz #/etc/squid/squid-backend.conf# http_port 127.0.01:400${process_number} http_access allow localhost cache_mem 5 MB cache_replacement_policy heap LFUDA maximum_object_size 1 GB cache_dir rock /cache/rock 20480 max-size=32768 cache_dir aufs /cache/${process_number} 20480 128 128 min-size=32769 visible_hostname backend${process_number}.cloud.solnet.nz access_log /var/log/squid3/backend${process_number}.access.log cache_log /var/log/squid3/backend${process_number}.cache.log I did have visible_hostname set to backend.cloud.solnet.nz but that did not help either. #/var/log/squid3/frontend.access.log# 1446163673.780 491 10.1.209.33 TCP_MISS/200 756381 GET http://asylum-inc.net/WoT/2013-03-03_00006.jpg - CARP/127.0.0.1 image/jpeg 1446163676.750 1580 10.1.209.33 TCP_MISS/200 756224 GET http://asylum-inc.net/WoT/2013-03-03_00006.jpg - HIER_DIRECT/69.73.181.160 image/jpeg 1446163681.498 3059 10.1.209.33 TCP_MISS/200 756224 GET http://asylum-inc.net/WoT/2013-03-03_00006.jpg - HIER_DIRECT/69.73.181.160 image/jpeg Any assistance is appreciated. Cheers Mike Hodgkinson Internal Support Engineer Mobile +64 21 754 339 Phone +64 4 462 5064 Email mike.hodgkin...@solnet.co.nz Solnet Solutions Limited Level 12, Solnet House 70 The Terrace, Wellington 6011 PO Box 397, Wellington 6140 www.solnet.co.nz Attention: This email may contain information intended for the sole use of the original recipient. Please respect this when sharing or disclosing this email's contents with any third party. If you believe you have received this email in error, please delete it and notify the sender or postmas...@solnetsolutions.co.nz as soon as possible. The content of this email does not necessarily reflect the views of Solnet Solutions Ltd.
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