上游超時（110：連接超時）靜態內容？

我有一個情況，其中兩個網絡服務器與nginx設置爲負載均衡器，並自己後端。發行版是Debian Wheezy。配置兩臺服務器（四核與32GB RAM）上游超時（110：連接超時）靜態內容？

TCP同一

#/etc/sysctl.conf 
vm.swappiness=0 
net.ipv4.tcp_window_scaling=1 
net.ipv4.tcp_timestamps=1 
net.ipv4.tcp_sack=1 
net.ipv4.ip_local_port_range=2000 65535 
net.ipv4.tcp_max_syn_backlog=65535 
net.core.somaxconn=65535 
net.ipv4.tcp_max_tw_buckets=2000000 
net.core.netdev_max_backlog=65535 
net.ipv4.tcp_rfc1337=1 
net.ipv4.tcp_fin_timeout=5 
net.ipv4.tcp_keepalive_intvl=15 
net.ipv4.tcp_keepalive_probes=5 
net.core.rmem_default=8388608 
net.core.rmem_max=16777216 
net.core.wmem_max=16777216 
net.ipv4.tcp_rmem=4096 87380 16777216 
net.ipv4.tcp_wmem=4096 16384 16777216 
net.ipv4.tcp_congestion_control=cubic 
net.ipv4.tcp_tw_reuse=1 
fs.file-max=3000000

Nginx的

#/etc/nginx/nginx.conf 
user www-data www-data; 
worker_processes 8; 
worker_rlimit_nofile 300000; 
pid /run/nginx.pid; 

events { 
     worker_connections 8192; 
     use epoll; 
     #multi_accept on; 
} 
http { 
     sendfile on; 
     tcp_nopush on; 
     tcp_nodelay on; 
     keepalive_timeout 10; 
     types_hash_max_size 2048; 
     server_tokens off; 

     open_file_cache max=200000 inactive=20s; 
     open_file_cache_valid 30s; 
     open_file_cache_min_uses 5; 
     open_file_cache_errors on; 

     gzip on; 
     gzip_vary on; 
     gzip_proxied any; 
     gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript; 
     gzip_min_length 10240; 
     gzip_disable "MSIE [1-6]\."; 
} 

server { 
    listen <PUBLIC-IPv4>:8080 default_server; 
    listen <PUBLIC-IPv6>:8080 default_server; 
    listen 127.0.0.1:8080 default_server; 
    listen [::1]:8080 default_server; 
    server_name backend01.example.com; 
    access_log /var/log/nginx/access upstream; 
    error_log /var/log/nginx/error; 

    root /var/www/project/web; 
    index app.php; 
    error_page 500 501 502 503 504 505 /50x.html; 
    client_max_body_size 8m; 

    location ~ /\. { return 403; } 
    try_files $uri $uri/ /app.php?$query_string; 
    location ~ ^/(config|app_dev|app)\.php(/|$) { 
     include fastcgi_params; 
     # fastcgi_split_path_info ^(.+\.php)(/.*)$; 
     fastcgi_pass unix:/var/run/php5-fpm.sock; 
     fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; 
     fastcgi_pass_header Authorization; 
     fastcgi_buffers 16 16k; 
     fastcgi_buffer_size 32k; 
     fastcgi_param HTTPS on; 
    } 
} 

upstream www { 
    ip_hash; 
    server [::1]:8080; 
    server backend02:8080; 
} 

server { 
    listen <LOADBALANCER-IPv4>:443 ssl spdy; 
    server_name www.example.com; 
    access_log /var/log/nginx/access main; 
    error_log /var/log/nginx/error; 

    ssl     on; 
    ssl_certificate  /etc/ssl/example.com.crt; 
    ssl_certificate_key /etc/ssl/example.com.key; 
    ssl_protocols  TLSv1 TLSv1.1 TLSv1.2; 
    ssl_prefer_server_ciphers on; 
    ssl_ciphers   ECDH+AESGCM:ECDH+AES256:ECDH+AES128:DH+3DES:!ADH:!AECDH:!MD5; 
    ssl_session_cache shared:SSL:20m; 
    ssl_session_timeout 10m; 

    root /var/www/project/web; 
    error_page 500 501 502 503 504 505 /50x.html; 
    client_max_body_size 8m; 

    location /00_templates { return 403; } 
    location/{ 
     proxy_read_timeout 300; 
     proxy_set_header Host $host; 
     proxy_set_header X-Real-IP $remote_addr; 
     proxy_pass http://www; 
     proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504; 
     proxy_buffers 16 16k; 
     proxy_buffer_size 32k; 
    } 
}

當模擬從3個客戶端的連接與

ab -c 200 -n 40000 -q https://www.example.com/static/file.html

爲什麼我可以得到

upstream timed out (110: Connection timed out) while connecting to upstream

in nginx log？一個靜態文件的600個併發連接的上游超時！？在運行ab測試，我可以先後端節點上看到：

# netstat -tan | grep ':8080 ' | awk '{print $6}' | sort | uniq -c 
     2 LISTEN 
    55 SYN_SENT 
    37346 TIME_WAIT

來源

2015-02-05 rabudde

OK，我不喜歡閱讀說明書，但回答我的問題：

nginx close upstream connection after request

解決它。那麼究竟是什麼問題：我的上游配置爲使用keepalive但Nginx的文檔建議設置在代理位置以下選項：

proxy_http_version 1.1; 
    proxy_set_header Connection "";

這就是它與在後端TIME_WAIT連接都走了一千，只有四圍150而不是30-40k。

來源

2015-02-06 12:18:05 rabudde

你們可知道什麼響應代碼發送回的情況下，上游超時錯誤出現的客戶端？ – akaHuman 2017-07-26 18:46:29

我認爲這是一個504 – rabudde 2017-07-30 20:17:08

IM我的情況是PHP-FPM需要重新啓動

來源

2017-01-04 20:28:32 zhakid

謝謝，問題幫助我:) – 2017-07-17 20:07:21

上游超時（110：連接超時）靜態內容？

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