Hello all,
I want to have 2 servers running varnish in parallel so that if one
fails the other still contains all cacheable data and the backend
servers won't be overloaded.
Could someone check to see if I'm on the right track ?
This is how I figure it should be working.
I don't know how large 'weight' can be, but with varnish caching > 90%
that impact would be affordable.
Regards,
Martin Boer
director via_other_varnish random {
.retries = 5;
{
.backend = other_server;
.weight = 9;
}
# use the regular backends if the other varnish instance fails.
{
.backend = backend_1;
.weight = 1;
}
{
.backend = backend_2;
.weight = 1;
}
{
.backend = backend_3;
.weight = 1;
}
}
director via_backends random {
{
.backend = backend_1;
.weight = 1;
}
{
.backend = backend_2;
.weight = 1;
}
{
.backend = backend_3;
.weight = 1;
}
}
sub vcl_recv {
if ( resp.http.X-through-varnish > 0 ) {
# other varnish forwarded the request already
# so forward to backends
set req.backend = via_backends;
remove resp.http.X-through-varnish;
} else {
# try the other varnish
resp.http.X-through-varnish = 1;
set req.backend = via_other_varnish;
}
..
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