Thanks Amos for the advices, It was related to IPv6. After commenting out the ipv6 entry on hosts file, the parents were successfully connected. Thanks again! Artemis On Sat, 2011-10-08 at 18:19 +1300, Amos Jeffries wrote: > On 08/10/11 03:51, Artemis Braja wrote: > > Hello, > > > > I'm running two frontends instances on ports 3128 and 3129, and two > > backend instances on ports 4001 and 4002 on the same box, and > > loadbalancing between parents using carp. > > cache_peer localhost parent 4001 0 carp name=backend-1 > > cache_peer localhost parent 4002 0 carp name=backend-2 > > > > squid -v > > Squid Cache: Version 3.1.15 > > configure options: '--enable-async-io' '--enable-linux-netfilter' > > '--enable-storeio=ufs,aufs' '--exec-prefix=/usr' '--bindir=/usr/sbin' > > '--libexecdir=/usr/lib/squid' '--enable-carp' '--enable-cache-digests' > > '--enable-removal-policies=lru,heap' --with-squid=/opt/squid-3.1.15 > > --enable-ltdl-convenience > > > > After successfully starting all instances I see on the frontends > > cache.log: > > 2011/10/07 16:10:56| TCP connection to localhost/4001 failed > > 2011/10/07 16:10:56| TCP connection to localhost/4002 failed > > 2011/10/07 16:10:57| TCP connection to localhost/4001 failed > > 2011/10/07 16:10:57| TCP connection to localhost/4002 failed > > 2011/10/07 16:10:57| Detected DEAD Parent: backend-2 > > 2011/10/07 16:10:58| TCP connection to localhost/4001 failed > > 2011/10/07 16:10:58| Detected DEAD Parent: backend-1 > > 2011/10/07 16:11:19| temporary disabling (Service Unavailable) digest > > from localhost > > 2011/10/07 16:20:16| TCP connection to localhost/4002 failed > > 2011/10/07 16:25:20| temporary disabling (Service Unavailable) digest > > from localhost > > > > Because only backends are caching, not connecting to then all traffic > > from frontends is forwarded to the origin servers, making the storages > > useless. > > Add no-digest to the cache_peer lines on the frontend. That will silence > the digest messages and make it a little bit longer before DEAD gets > triggered. > > Check that your backend were actually finished loading their caches and > listening for new traffic before the frontend were connected to them. > > Note that Squid-3.1 is IPv6-enabled software so "localhost" is probably > the IP address ::1. You may need to check your IPv6 firewall settings to > verify the layers can connect over localhost. > > Amos
