When will primary server come back in http upstream module?

linbo liao llbgurs at gmail.com
Wed Jun 21 13:54:28 UTC 2017


Refer to http://nginx.org/en/docs/http/ngx_http_upstream_module.html#server ,
if all primary server are unavailable, backup server will handle request.

I have two question?
1.  What's the meaning of unavailable?
2.  When will primary server come back, after fail_timeout?

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