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set fail_timeout=0 as recommended by Unicorn

Created by: bbodenmiller

Set's fail_timeout=0 as recommended by http://unicorn.bogomips.org/Unicorn/Configurator.html#method-i-timeout when Unicorn is running behind nginx.

For running Unicorn behind nginx, it is recommended to set fail_timeout=0 for in your nginx configuration like this to have nginx always retry backends that may have had workers SIGKILL-ed due to timeouts.

From Module ngx_http_upstream_module:

fail_timeout=time sets

  • the time during which the specified number of unsuccessful attempts to communicate with the server should happen to consider the server unavailable;
  • and the period of time the server will be considered unavailable.

By default, the parameter is set to 10 seconds.

Courtesy of @phunehehe from https://github.com/gitlabhq/gitlabhq/issues/6621#issuecomment-44828050.