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I have a server with the following sysctl settings:

net.ipv4.ip_local_port_range = 1024 65535
net.core.netdev_max_backlog = 65535
net.ipv4.tcp_max_syn_backlog = 50000
net.ipv4.tcp_max_tw_buckets = 2000000
net.ipv4.tcp_fin_timeout = 15
net.core.somaxconn = 65535

Yet my nginx at peak traffic complains about connecting to my php-fpm unix sockets.

2021/09/30 17:06:24 [error] 1848498#1848498: *32855016 connect() to unix:/var/php/streamer.sock failed (11: Resource temporarily unavailable) while connecting to upstream, client: 100.1.1.3

I can't find if I'm at maximum value possible or if it's possible to increase more, if I should change to TCP/IP or etc. All traffic to this server is served via another instance over wireguard so the client is always 100.1.1.3

Also a answer that shows how to know how much of those resources you are really using would sure help a lot of people googling about this

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    That's just a guess, but could you change whatever program is listening to that /var/php/streamer.sock to call listen(2) with a larger backlog argument? Commented Oct 1, 2021 at 9:12
  • Look for listen.backlog in php-fpm.conf and see if setting it to something larger fixes that issue. Maybe you're lucky ;-) Commented Oct 1, 2021 at 9:25
  • About Uncle Billy's setting, ss -lxn src == /var/php/streamer.sock should display the values in use: backlog in Send-Q, "in the pipeline"/pending in Recv-Q. if Recv-Q > Send-Q, there's one or more connection(s) that can potentially fail. (those fields show different information on the LISTEN entry, normally it's about pending data , rather than pending connections) Commented Oct 1, 2021 at 11:16

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