I'm trying to set up a two-node squid proxy cluster. It would be a normal proxy (neither reverse, nor transparent).
I'm using LVS (kernel 2.6.32, ipvsadm v.1.2.1, tunneling) for load balancing, ldirectord (v. 1.0.3) for HA, squid (v.3.1.7) as a proxy server.
The cluster works OK for most sites, but experiences problems with (for instance) login to google accounts, login to serverfault.com via OpenID, etc. It seems that problems appear at sites with some kind of redirect, though on other sites 301-coded redirects work fine. When I work directly through each proxy node, everything is OK. I tried different types of job scheduling algorithms in LVS, but it didn't help. Leaving only one node in the cluster also doesn't solve the problem. Squid's access.log and cache.log are also "clean", no errors appear, just a normal acivity.
Did anybody met such problems? Does anybody have a working cluster of this type (balanced with IPVS)? Any ideas on troubleshooting?
Here are some parts of config files: ldirectord.cf:
# Virtual Server for HTTP_PROXY virtual=10.128.0.109:8080 fallback=127.0.0.1:80 real=10.128.1.43:8080 ipip 30 real=10.128.0.106:8080 ipip 40 service=http_proxy request="http://www.google.com/index.html" receive="Google Search" scheduler=wlc #persistent=600 protocol=tcp checktype=negotiate
http_port 10.128.0.106:8080 # "real" IP of the node http_port 10.128.0.109:8080 # "Virtual" IP of the cluster on tunl0 interface http_port 127.0.0.1:8080 cache_mem 300 MB cache_dir ufs /opt/squid/var/cache 500 16 256 cache_effective_user squid cache_effective_group squid visible_hostname AQUA-node cachemgr_passwd SquidCM all access_log /opt/squid/var/logs/access.log logfile_rotate 5 # ICQ connect (experimental) acl ICQ_ADDR dst 220.127.116.11/16 18.104.22.168/16 acl ICQ_PORT port 5190 443 acl CONNECT method CONNECT acl ICQ_PROTO proto HTTPS acl ICQ_DOMAIN dstdomain .icq.com .aol.com .aim.com always_direct allow ICQ_DOMAIN ICQ_PORT CONNECT always_direct allow ICQ_ADDR ICQ_PORT CONNECT acl allnet_temp src 10.0.0.0/8 http_access allow allnet_temp http_access deny all
If any other information needed, just let me know.