[squid-users] Squid marks alive siblings as dead.

Hey All,

Been working on rolling out HTCP cache_peer relationships within my
squid cluster, but I'm running into a 'small' issue. After starting
squid with the cache_peers configured to use htcp, squid sends quite a
few UDP packets to the siblings on the htcp port, however, it then marks
them as dead.

Ideas/help would be appreciated!

Below are tcpdumps, and the config I'm utilizing.

Cache8 tcpdump from squid startup on cache1 to cache8 being marked as dead:

00:52:41.512445 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 921
00:52:41.807481 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 789
00:52:41.807995 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 346
00:52:41.808106 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 354
00:52:41.808227 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 362
00:52:41.968961 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 322
00:52:42.023668 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 789
00:52:42.173640 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 299
00:52:42.277635 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 789
00:52:42.641855 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 485
00:52:42.790272 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 366
00:52:42.795551 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 350
00:52:42.898732 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 292
00:52:43.293162 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 296
00:52:43.627891 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 284
00:52:44.394020 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 366
00:52:44.675878 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 321
00:52:45.241068 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 940
00:52:47.834801 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 349
00:52:48.947938 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 302
00:52:49.048647 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 321
00:52:49.120675 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 567
00:52:49.324587 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 363
00:52:50.250438 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 370
00:52:51.396922 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 318
00:52:51.512461 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 935
00:52:51.927925 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 349
00:53:02.172733 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 771

Cache1 tcpdump from squid startup on cache1 to cache8 being marked as dead:

00:52:41.506998 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 921
00:52:41.802035 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 789
00:52:41.802574 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 346
00:52:41.802686 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 354
00:52:41.802807 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 362
00:52:41.963543 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 322
00:52:42.018232 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 789
00:52:42.168224 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 299
00:52:42.272199 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 789
00:52:42.636431 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 485
00:52:42.784852 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 366
00:52:42.790131 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 350
00:52:42.893315 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 292
00:52:43.287743 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 296
00:52:43.622474 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 284
00:52:44.388599 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 366
00:52:44.670459 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 321
00:52:45.235623 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 940
00:52:47.829382 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 349
00:52:48.942519 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 302
00:52:49.043228 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 321
00:52:49.115246 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 567
00:52:49.319166 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 363
00:52:50.245010 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 370
00:52:51.391500 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 318
00:52:51.507016 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 935
00:52:51.922504 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 349
00:53:02.167290 IP cache1.int.last.fm.4827 > cache8.int.last.fm.4827:
UDP, length 771

Cache1 cache.log from restart to cache8 being marked dead:

2007/10/12 00:52:41| Reconfiguring Squid Cache (version 2.6.STABLE14)...
2007/10/12 00:52:41| FD 339 Closing HTTP connection
2007/10/12 00:52:41| Closing Pinger socket on FD 344
2007/10/12 00:52:41| FD 340 Closing ICP connection
2007/10/12 00:52:41| FD 341 Closing HTCP socket
2007/10/12 00:52:41| FD 343 Closing SNMP socket
2007/10/12 00:52:41| Cache dir '/var/spool/squid-int' size remains
unchanged at 104857600 KB
2007/10/12 00:52:41| User-Agent logging is disabled.
2007/10/12 00:52:41| DNS Socket created at 0.0.0.0, port 32825, FD 219
2007/10/12 00:52:41| Adding nameserver 10.0.6.12 from squid.conf
2007/10/12 00:52:41| Adding nameserver 10.0.0.12 from squid.conf
2007/10/12 00:52:41| Accepting accelerated HTTP connections at 0.0.0.0,
port 8081, FD 225.
2007/10/12 00:52:41| Accepting ICP messages at 0.0.0.0, port 3131, FD 228.
2007/10/12 00:52:41| Accepting HTCP messages on port 4827, FD 233.
2007/10/12 00:52:41| Accepting SNMP messages on port 3402, FD 244.
2007/10/12 00:52:41| WCCP Disabled.
2007/10/12 00:52:41| Pinger socket opened on FD 288
2007/10/12 00:52:41| Configuring Parent 10.0.0.15/80/0
2007/10/12 00:52:41| Configuring Parent 10.0.20.1/81/0
2007/10/12 00:52:41| Configuring Parent 10.0.20.1/82/0
2007/10/12 00:52:41| Configuring Parent 10.0.20.1/83/0
2007/10/12 00:52:41| Configuring Parent 10.0.20.1/84/0
2007/10/12 00:52:41| Configuring Parent 10.0.20.2/81/0
2007/10/12 00:52:41| Configuring Parent 10.0.20.2/82/0
2007/10/12 00:52:41| Configuring Parent 10.0.20.2/83/0
2007/10/12 00:52:41| Configuring Parent 10.0.20.2/84/0
2007/10/12 00:52:41| Configuring Parent 10.0.0.35/80/0
2007/10/12 00:52:41| Configuring Parent 10.0.0.35/81/0
2007/10/12 00:52:41| Configuring Parent 10.0.0.114/80/0
2007/10/12 00:52:41| Configuring Parent 10.0.0.114/81/0
2007/10/12 00:52:41| Configuring Parent 10.0.0.114/82/0
2007/10/12 00:52:41| Configuring Parent 10.0.0.114/83/0
2007/10/12 00:52:41| Configuring Sibling 10.0.12.8/8081/4827
2007/10/12 00:52:41| Loaded Icons.
2007/10/12 00:52:41| Ready to serve requests.
2007/10/12 00:53:02| Detected DEAD Sibling: 10.0.12.8

Global squid configuration (on deployment, things that aren't valid for
a particular box - i.e. having itself in the squid.conf as a cache_peer
- are removed):

http_port 8081 accel vhost
hosts_file /etc/hosts
dns_nameservers 10.0.6.12 10.0.0.12
#mime_table /etc/squid-int/mime.conf
cache_effective_user proxy
cache_replacement_policy heap GDSF
cache_swap_low 90
cache_swap_high 95
coredump_dir /var/spool/squid-int
cache_dir aufs /var/spool/squid-int 102400 16 256
cache_mem 200 MB
maximum_object_size_in_memory 50 KB
access_log /var/log/squid-int/access.log
cache_log /var/log/squid-int/cache.log
cache_store_log /var/log/squid-int/store.log
#visible_hostname cache2.int.last.fm
pid_filename /var/run/squid-int.pid
logfile_rotate 10
memory_pools off
maximum_object_size 50 MB
quick_abort_min 0 KB
quick_abort_max 0 KB
log_icp_queries off
client_db off
half_closed_clients off
query_icmp on
pinger_program /usr/bin/pinger
netdb_ping_period 120 second
test_reachability on
digest_generation on
digest_bits_per_entry 4
digest_rebuild_period 2 hours
digest_rewrite_period 2 hours
digest_swapout_chunk_size 16 KB
digest_rebuild_chunk_percentage 5
prefer_direct off

acl all src 0.0.0.0/0.0.0.0
acl squiddies src 10.0.0.0/255.0.0.0
acl static dstdomain static.last.fm
acl userserve dstdomain userserve.last.fm
acl ws dstdomain ws.audioscrobbler.com
acl mainsite dstdom_regex www.last.*fm.* cn.last.fm lastfm.spiegel.de
ws.audioscrobbler.com ext.last.fm
http_access allow static
http_access allow ws
http_access allow userserve
http_access allow mainsite
http_access allow squiddies
http_access deny all

miss_access allow all
miss_access deny squiddies

icp_access allow squiddies
icp_port 3131

htcp_port 4827

###Static
cache_peer 10.0.0.15 parent 80 0 no-query originserver no-digest
no-netdb-exchange name=static
cache_peer_domain static static.last.fm
###Static ends

###Userserve
cache_peer 10.0.20.1 parent 81 0 no-query originserver no-digest
no-netdb-exchange name=userserve1-81 round-robin
cache_peer_domain userserve1-81 userserve.last.fm

cache_peer 10.0.20.1 parent 82 0 no-query originserver no-digest
no-netdb-exchange name=userserve1-82 round-robin
cache_peer_domain userserve1-82 userserve.last.fm

cache_peer 10.0.20.1 parent 83 0 no-query originserver no-digest
no-netdb-exchange name=userserve1-83 round-robin
cache_peer_domain userserve1-83 userserve.last.fm

cache_peer 10.0.20.1 parent 84 0 no-query originserver no-digest
no-netdb-exchange name=userserve1-84 round-robin
cache_peer_domain userserve1-84 userserve.last.fm

cache_peer 10.0.20.2 parent 81 0 no-query originserver no-digest
no-netdb-exchange name=userserve2-81 round-robin
cache_peer_domain userserve2-81 userserve.last.fm

cache_peer 10.0.20.2 parent 82 0 no-query originserver no-digest
no-netdb-exchange name=userserve2-82 round-robin
cache_peer_domain userserve2-82 userserve.last.fm

cache_peer 10.0.20.2 parent 83 0 no-query originserver no-digest
no-netdb-exchange name=userserve2-83 round-robin
cache_peer_domain userserve2-83 userserve.last.fm

cache_peer 10.0.20.2 parent 84 0 no-query originserver no-digest
no-netdb-exchange name=userserve2-84 round-robin
cache_peer_domain userserve2-84 userserve.last.fm
###Userserve Ends

###ws.audioscrobbler.com & mainsite
cache_peer 10.0.0.35 parent 80 0 no-query originserver no-digest
no-netdb-exchange name=perlbal1-80 round-robin
cache_peer_access perlbal1-80 allow mainsite

cache_peer 10.0.0.35 parent 81 0 no-query originserver no-digest
no-netdb-exchange name=perlbal1-81 round-robin
cache_peer_access perlbal1-81 allow mainsite

cache_peer 10.0.0.114 parent 80 0 no-query originserver no-digest
no-netdb-exchange name=perlbal2-80 round-robin
cache_peer_access perlbal2-80 allow mainsite

cache_peer 10.0.0.114 parent 81 0 no-query originserver no-digest
no-netdb-exchange name=perlbal2-81 round-robin
cache_peer_access perlbal2-81 allow mainsite

cache_peer 10.0.0.114 parent 82 0 no-query originserver no-digest
no-netdb-exchange name=perlbal2-82 round-robin
cache_peer_access perlbal2-82 allow mainsite

cache_peer 10.0.0.114 parent 83 0 no-query originserver no-digest
no-netdb-exchange name=perlbal2-83 round-robin
cache_peer_access perlbal2-83 allow mainsite
###ws.audioscrobbler.com & mainsite Ends

snmp_port 3402
acl snmppublic snmp_community public
snmp_access allow snmppublic
snmp_incoming_address 0.0.0.0
snmp_outgoing_address 255.255.255.255

cache_peer 10.0.12.1 neighbour 8081 4827 round-robin htcp
cache_peer 10.0.12.2 neighbour 8081 4827 round-robin htcp
cache_peer 10.0.12.3 neighbour 8081 4827 round-robin htcp
cache_peer 10.0.12.4 neighbour 8081 4827 round-robin htcp
cache_peer 10.0.12.5 neighbour 8081 4827 round-robin htcp
cache_peer 10.0.12.6 neighbour 8081 4827 round-robin htcp
cache_peer 10.0.12.7 neighbour 8081 4827 round-robin htcp
cache_peer 10.0.12.8 neighbour 8081 4827 round-robin htcp

Thanks guys

-- 
Tony Dodd, Systems Administrator
Last.fm | http://www.last.fm
Karen House 1-11 Baches Street
London N1 6DL
check out my music taste at:
http://www.last.fm/user/hawkeviper