nginx stress test 502 504 error

The project frequently had 502 504 errors during stress testing. Through various troubleshooting, we finally found the problem. It was caused by tcp access timeout.

tcp_nodelay on;

fastcgi_connect_timeout 600;

fastcgi_send_timeout 600;

fastcgi_read _timeout 600;
fastcgi_buffer_size 64k;
fastcgi_buffers 4 64k;
fastcgi_busy_buffers_size 128k;
fastcgi_temp_file_write_size 128k;


nginx proxy: connect() to ip:80 failed (99: Cannot assign address requested)

modify /etc/sysctl.conf:

net.ipv4.tcp_timestamps = 1

net.ipv4.tcp_tw_recycle = 0
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_max_tw_buckets = 10000
net.ipv4.ip_nonlocal_bind = 1

sysctl -p

The following is tcp Introduction article of settings

http://blog.renhao.org/2010/07/setup-linux-kernel-tcp-settings/

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