#pid logs/nginx.pid;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
#log_format main '$remote_addr - remoteuser[remote_user [remoteuser[time_local] “$request” ’
'$status bodybytessent"body_bytes_sent "bodybytessent"http_referer" ’
‘“httpuseragent""http_user_agent" "httpuseragent""http_x_forwarded_for”’;
#access_log logs/access.log main;
sendfile on;
#tcp_nopush on;
#keepalive_timeout 0;
keepalive_timeout 65;
#gzip on;
server {
listen 8091;
server_name localhost;
#charset koi8-r;
#access_log logs/host.access.log main;
location / {
proxy_connect_timeout 300s;
proxy_send_timeout 300s;
proxy_read_timeout 300s;
proxy_set_header Host host:host:host:server_port;
proxy_set_header X-real-ip $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_pass http://192.168.1.61:9199/;
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
}
在测试环境访问，相同的配置没有问题，但是放到正式环境就会出现间隙性访问502的错误。
[](()问题定位
===================================================================
查看nginx 错误日志。
/08/07 09:29:22 [crit] 12236#11116: *457 connect() to 172.18.44.6:8091 failed (10055: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full) while connecting to upstream, client: 183.17.229.173, server: localhost, request: “GET / HTTP/1.1”, upstream: “http://172.18.44.6:8091/”, host: “183.207.215.123:8091”
/08/07 09:29:22 [crit] 12236#11116: *458 connect() to 172.18.44.6:8091 failed (10055: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full) while connecting to upstream, client: 183.17.229.173, server: localhost, request: “GET / HTTP/1.1”, upstream: “http://172.18.44.6:8091/”, host: “183.207.215.123:8091”
/08/07 09:29:22 [crit] 12236#11116: *460 connect() to 172.18.44.6:8091 failed (10055: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full) while connecting to upstream, client: 183.17.229.173, server: localhost, request: “GET / HTTP/1.1”, upstream: “http://172.18.44.6:8091/”, host: “183.207.215.123:8091”
/08/07 09:29:22 [crit] 12236#11116: *462 connect() to 172.18.44.6:8091 failed (10055: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full) while connecting to upstream, client: 183.17.229.173, server: localhost, request: “GET / HTTP/1.1”, upstream: “http://172.18.44.6:8091/”, host: “183.207.215.123:8091”
/08/07 09:29:22 [crit] 12236#11116: *464 connect() to 172.18.44.6:8091 failed (10055: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full) while connecting to upstream, client: 183.17.229.173, server: localhost, request: “GET / HTTP/1.1”, upstream: “http://172.18.44.6:8091/”, host: “183.207.215.123:8091”
/08/07 09:29:22 [crit] 12236#11116: *466 connect() to 172.18.44.6:8091 failed (10055: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full) while connecting to upstream, client: 183.17.229.173, server: localhost, request: “GET / HTTP/1.1”, upstream: “http://172.18.44.6:8091/”, host: “183.207.215.123:8091”
/08/07 09:29:22 [crit] 12236#11116: *468 connect() to 172.18.44.6:8091 failed (10055: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full) while connecting to upstream, client: 183.17.229.173, server: localhost, request: “GET / HTTP/1.1”, upstream: “http://172.18.44.6:8091/”, host: “183.207.215.123:8091”
/08/07 09:29:22 [crit] 12236#11116: *470 connect() to 172.18.44.6:8091 failed (10055: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full) while connecting to upstream, client: 183.17.229.173, server: localhost, request: “GET / HTTP/1.1”, upstream: “http://172.18.44.6:8091/”, host: “183.207.215.123:8091”
/08/07 09:29:22 [crit] 12236#11116: *472 connect() to 172.18.44.6:8091 failed (10055: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full) while connecting to upstream, client: 183.17.229.173, server: localhost, request: “GET / HTTP/1.1”, upstream: “http://172.18.44.6:8091/”, host: “183.207.215.123:8091”
/08/07 09:29:22 [crit] 12236#11116: *474 connect() to 172.18.44.6:8091 failed (10055: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full) while connecting to upstream, client: 183.17.229.173, server: localhost, request: “GET / HTTP/1.1”, upstream: “http://172.18.44.6:8091/”, host: “183.207.215.123:8091”
/08/07 09:29:22 [crit] 12236#11116: *476 connect() to 172.18.44.6:8091 failed (10055: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full) while connecting to upstream, client: 183.17.229.173, server: localhost, request: “GET / HTTP/1.1”, upstream: “http://172.18.44.6:8091/”, host: “183.207.215.123:8091”
/08/07 09:29:22 [crit] 12236#11116: *478 connect() to 172.18.44.6:8091 failed (10055: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full) while connecting to upstream, client: 183.17.229.173, server: localhost, request: “GET / HTTP/1.1”, upstream: “http://172.18.44.6:8091/”, host: “183.207.215.123:8091”
/08/07 09:29:22 [crit] 12236#11116: *480 connect() to 172.18.44.6:8091 failed (10055: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full) while connecting to upstream, client: 183.17.229.173, server: localhost, request: “GET / HTTP/1.1”, upstream: “http://172.18.44.6:8091/”, host: “183.207.215.123:8091”
/08/07 09:29:22 [crit] 12236#11116: *482 connect() to 172.18.44.6:8091 failed (10055: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full) while connecting to upstream, client: 183.17.229.173, server: localhost, request: “GET / HTTP/1.1”, upstream: “http://172.18.44.6:8091/”, host: “183.207.215.123:8091”
/08/07 09:29:22 [crit] 12236#11116: *484 connect() to 172.18.44.6:8091 failed (10055: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full) while connecting to upstream, client: 183.17.229.173, server: localhost, request: “GET / HTTP/1.1”, upstream: “http://172.18.44.6:8091/”, host: “183.207.215.123:8091”
《一线大厂Java面试题解析+后端开发学习笔记+最新架构讲解视频+实战项目源码讲义》无偿开源 威信搜索公众号【编程进阶路】/08/07 09:29:22 [crit] 12236#11116: *486 connect() to 172.18.44.6:8091 failed (10055: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full) while connecting to upstream, client: 183.17.229.173, server: localhost, request: “GET / HTTP/1.1”, upstream: “http://172.18.44.6:8091/”, host: “183.207.215.123:8091”
/08/07 09:29:22 [crit] 12236#11116: *488 connect() to 172.18.44.6:8091 failed (10055: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full) while connecting to upstream, client: 183.17.229.173, server: localhost, request: “GET / HTTP/1.1”, upstream: “http://172.18.44.6:8091/”, host: “183.207.215.123:8091”
/08/07 09:29:22 [crit] 12236#11116: *490 connect() to 172.18.44.6:8091 failed (10055: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full) while connecting to upstream, client: 183.17.229.173, server: localhost, request: “GET / HTTP/1.1”, upstream: “http://172.18.44.6:8091/”, host: “183.207.215.123:8091”
/08/07 09:29:22 [crit] 12236#11116: *494 connect() to 172.18.44.6:8091 failed (10055: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full) while connecting to upstream, client: 183.17.229.173, server: localhost, request: “GET / HTTP/1.1”, upstream: “http://172.18.44.6:8091/”, host: “183.207.215.123:8091”
/08/07 09:29:22 [crit] 12236#11116: *495 connect() to 172.18.44.6:8091 failed (10055: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full) while connecting to upstream, client: 183.17.229.173, server: localhost, request: “GET / HTTP/1.1”, upstream: “http://172.18.44.6:8091/”, host: “183.207.215.123:8091”
/08/07 09:29:22 [crit] 12236#11116: *497 connect() to 172.18.44.6:8091 failed (10055: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full) while connecting to upstream, client: 183.17.229.173, server: localhost, request: “GET / HTTP/1.1”, upstream: “http://172.18.44.6:8091/”, host: “183.207.215.123:8091”
/08/07 09:29:59 [crit] 12236#11116: *490 connect() to 172.18.44.6:8091 failed (10055: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full) while connecting to upstream, client: 183.17.229.173, server: localhost, request: “GET / HTTP/1.1”, upstream: “http://172.18.44.6:8091/”, host: “183.207.215.123:8091”
都是报错：
10055: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full
翻译过来的意思就是：套接字上的操作无法执行，因为系统缺少足够的缓冲区空间或队列已满。
意思是说缓存满了，这个更像是服务器的问题。
网上百度了一圈，也没有找到很好的解决方案。
查看端口也没有很多的等待队列。
netstat -ano |findstr “8091”
但是既然是报这种错，系统缺少足够的缓冲区空间。就先从这个错误入手。
在nginx 中设置代理的缓存。
proxy_buffering on;#开启从后端被代理服务器的响应内容缓冲
proxy_buffer_size 4k;#设置从后端被代理服务器的响应内容缓冲区大小
proxy_buffers8 1M; #设置从被代理的后端服务器取得的响应内容缓冲区的大小和数量
proxy_busy_buffers_size 2M; #高负荷下缓冲大小（proxy_buffers*2）
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