Varnishでちょっと特殊な負荷の割り当て方(req.backend.healthy) – cat /dev/random > /dev/null &

例えばVarnishで複数のバックエンドを持っていてどちらかが倒れても片系でも動くようにする場合 backend c01 { .host = "192.168.1.1"; .port = "80"; .probe = { .url = "/healthcheck.gif"; .timeout = 0.3 s; .window = 8; .threshold = 3; } } backend c02 { .host = "192.168.1.2"; .port = "80"; .probe = { .url = "/healthcheck.gif"; .timeout = 0.3 s; .window = 8; .threshold = 3; } } director defcache random { .retries = 5; { .backend = c01; .weight = 5;