Hello,
I recently installed Varnish from the Redhat EPEL repository (Varnish
2.1.5-1.el6.x86_64) and I'm having a slight problem with load balancing. I
currently have two backends:
director default round-robin {
{ .backend = { .host = "webhead01.example.com"; .port = "http";
.connect_timeout = 1s; .first_byte_timeout = 5s; .between_bytes_timeout = 2s; }
}
{ .backend = { .host = "webhead02.example.com"; .port = "http";
.connect_timeout = 1s; .first_byte_timeout = 5s; .between_bytes_timeout = 2s; }
}
}
and when I shut down Apache on one of the backends and restart Varnish, I get
"503 Service Unavailable" errors on random files (usually just one or two
files). I never get this error when both backends are running. How does the
Varnish probes work, do they ping the backend server to see if they are alive
or actually attempt to connect to port 80 to see if Apache is alive? I'm
relatively new to Varnish, so I want to apologize if I don't have all the
information or missing a configuration somewhere.
Henry Umansky
Web Development Services
Princeton University
[email protected]
609-258-1674
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