Nginx高並發配置思路（輕松應對1萬並發量）

測試機器為騰訊雲服務器1核1G內存，swap分區2G，停用除SSH外的所有服務，僅保留nginx，優化思路主要包括兩個層面：系統層面+nginx層面。

一、系統層面

1、調整同時打開文件數量

ulimit -n 20480

2、TCP最大連接數（somaxconn）

echo 10000 > /proc/sys/net/core/somaxconn

3、TCP連接立即回收、回用（recycle、reuse）

echo 1 > /proc/sys/net/ipv4/tcp_tw_reuse
echo 1 > /proc/sys/net/ipv4/tcp_tw_recycle

4、不做TCP洪水抵御

echo 0 > /proc/sys/net/ipv4/tcp_syncookies

也可以直接使用優化后的配置，在/etc/sysctl.conf中加入：

net.core.somaxconn = 20480
net.core.rmem_default = 262144
net.core.wmem_default = 262144
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_rmem = 4096 4096 16777216
net.ipv4.tcp_wmem = 4096 4096 16777216
net.ipv4.tcp_mem = 786432 2097152 3145728
net.ipv4.tcp_max_syn_backlog = 16384
net.core.netdev_max_backlog = 20000
net.ipv4.tcp_fin_timeout = 15
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_max_orphans = 131072
net.ipv4.tcp_syncookies = 0

使用：sysctl -p 生效

sysctl -p

二、nginx層面

修改nginx配置文件，nginx.conf

增加work_rlimit_nofile和worker_connections數量，並禁用keepalive_timeout。

worker_processes  1;
worker_rlimit_nofile 20000;

events {
    use epoll;
    worker_connections 20000;
    multi_accept on;
}

http {
　　keepalive_timeout 0;
}

重啟nginx

/usr/local/nginx/sbin/nginx -s reload

使用ab壓力測試

ab -c 10000 -n 150000 http://127.0.0.1/index.html

測試結果：

This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking 127.0.0.1 (be patient)
Completed 15000 requests
Completed 30000 requests
Completed 45000 requests
Completed 60000 requests
Completed 75000 requests
Completed 90000 requests
Completed 105000 requests
Completed 120000 requests
Completed 135000 requests
Completed 150000 requests
Finished 150000 requests


Server Software:        nginx/1.8.0
Server Hostname:        127.0.0.1
Server Port:            80

Document Path:          /index.html
Document Length:        612 bytes

Concurrency Level:      10000
Time taken for tests:   19.185 seconds
Complete requests:      150000
Failed requests:        0
Write errors:           0
Total transferred:      131180388 bytes
HTML transferred:       95121324 bytes
Requests per second:    7818.53 [#/sec] (mean)
Time per request:       1279.013 [ms] (mean)
Time per request:       0.128 [ms] (mean, across all concurrent requests)
Transfer rate:          6677.33 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0  650 547.9    522    7427
Processing:   212  519 157.4    496     958
Waiting:        0  404 139.7    380     845
Total:        259 1168 572.1   1066    7961

Percentage of the requests served within a certain time (ms)
  50%   1066
  66%   1236
  75%   1295
  80%   1320
  90%   1855
  95%   2079
  98%   2264
  99%   2318
 100%   7961 (longest request)