Fastcgi retry upstream (transparent php-fpm restart)?

Hi,

I’m using nginx with 1 php-fpm (via unix socket), and i’m wondering if
there is a way to make nginx retry on error, something like
fastcgi_next_upstream but for the same upstream.

I would like to be able to transparently restart php-fpm and not send
some
502 to the clients

So, is there a way to make nginx retry the same upstream for X seconds
(or
retry every Y seconds for max Z attempts or …) (on errors like
“connect()
failed (111: Connection refused) while connecting to upstream”) ?

I’m open to any tricks

Thanks in advance
Etienne

p.s: I already know about atomic/transparent php deployment with
“$realpath_root” and multiple docroot (
https://github.com/zendtech/ZendOptimizerPlus/issues/126#issuecomment-24020445
)

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