keepalive_timeout
http 有一个 keepalive 模式，它告诉 webserver 在处理完一个请求后保持这个 tcp 连接的打开状态。若接收到来自客户端的其它请求，服务端会利用这个未被关闭的连接，而不需要再建立一个连接。
http keep-alive, 網頁的每一個請求都是http (圖片, css等), 而打開http 請求是要先建立tcp 連接, 而如果一個頁面每個請求都要打開及關閉一個tcp 連接就會做成資源的浪費. keepalive_timeout 就是當一個http 請求完成, 其tcp 連接會存留下來的時間, 如果這時有另一個http 請求過來, 會複用這個tcp 連接, 如果再沒有新的請求過來, 才會關閉其tcp連接
user nginx;
worker_processes 1;
error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;
events {
worker_connections 1024;
}
http {
include /etc/nginx/mime.types;
default_type application/octet-stream;
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log /var/log/nginx/access.log main;
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
client_max_body_size 8192m;
#gzip on;
#include /etc/nginx/conf.d/*.conf;
server {
listen 80 so_keepalive=30m::;
listen 443 default ssl;
ssl_certificate /etc/nginx/ssl/server.crt;
ssl_certificate_key /etc/nginx/ssl/portalkey.key;
#ssl_password_file /etc/nginx/ssl/ssl.pass;
ssl_session_timeout 5m;
ssl_protocols sslv2 sslv3 tlsv1;
ssl_ciphers high:!anull:!md5;
ssl_prefer_server_ciphers on;
location / {
proxy_request_buffering off;
proxy_pass http://127.0.0.1:8011/;
proxy_connect_timeout 180;
proxy_send_timeout 180;
proxy_read_timeout 180;
send_timeout 180;
}
location /test1_url/ {
proxy_pass http://127.0.0.1:8008/;
proxy_connect_timeout 180;
proxy_send_timeout 180;
proxy_read_timeout 180;
send_timeout 180;
}
location /test2_url/ {
proxy_pass http://127.0.0.1:3000/;
proxy_connect_timeout 180;
proxy_send_timeout 180;
proxy_read_timeout 180;
send_timeout 180;
}
}
}# 配置段: http，默认75s
keepalive_timeout 60;
send_timeout :发送数据至客户端超时, 默认60s, 如果连续的60s内客户端没有收到1个字节, 连接关闭
proxy_connect_timeout: nginx与upstream server的连接超时时间
proxy_read_timeout: nginx接收upstream server数据超时, 默认60s, 如果连续的60s内没有收到1个字节, 连接关闭
proxy_send_timeout: nginx发送数据至upstream server超时, 默认60s, 如果连续的60s内没有发送1个字节, 连接关闭
so_timeout:
當用戶跟server開啟了tcp connection --> 一段長時間這個connection 沒traffic (so_keepalive timeout) --> server 發出探測包看用戶是否還存在 --> 若探測包沒回, 則關閉tcp connection
so_keepalive=on|off|[keepidle]:[keepintvl]:[keepcnt]
so_keepalive=30m::10 will set the idle timeout (tcp_keepidle) to 30 minutes, leave the probe interval (tcp_keepintvl) at its system default, and set the probes count (tcp_keepcnt) to 10 probes.
以上三个参数只能使用一个，不能同时使用， 比如so_keepalive=on, so_keepalive=off或者so_keepalive=30s::(表示等待30s没有数据报文发送探测报文)
