在docker容器中运行nginx的性能问题

Question

我正在使用ApacheBench(ab)来测量两个nginx在Linux上的性能。它们有相同的配置文件。唯一的区别是nginx运行在docker容器中。

Running: ab -n 50000 -c 1000 http://172.17.0.2:7082/

Concurrency Level:      1000
Time taken for tests:   9.376 seconds
Complete requests:      50000
Failed requests:        0
Total transferred:      8050000 bytes
HTML transferred:       250000 bytes
Requests per second:    5332.94 [#/sec] (mean)
Time per request:       187.514 [ms] (mean)
Time per request:       0.188 [ms] (mean, across all concurrent requests)
Transfer rate:          838.48 [Kbytes/sec] received

Running: ab -n 50000 -c 1000 http://172.17.0.2:6066/

Concurrency Level:      1000
Time taken for tests:   31.274 seconds
Complete requests:      50000
Failed requests:        0
Total transferred:      8050000 bytes
HTML transferred:       250000 bytes
Requests per second:    1598.76 [#/sec] (mean)
Time per request:       625.484 [ms] (mean)
Time per request:       0.625 [ms] (mean, across all concurrent requests)
Transfer rate:          251.37 [Kbytes/sec] received

只是想知道为什么容器一有这么差的性能

nginx.conf：

worker_processes  auto;
worker_rlimit_nofile 10240;

events {
    use epoll;
    multi_accept on;
    worker_connections  4096;
}

http {
    include       mime.types;
    default_type  application/octet-stream;

    sendfile        on;
    keepalive_timeout  10;

    client_header_timeout 10;
    client_body_timeout 10;

    send_timeout 10;

    tcp_nopush on;
    tcp_nodelay on;

    server {
        listen       80;
        server_name  localhost;
        location / {
            return 200 'hello';
        }

        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    }
}

Answer 1

我想补充一下@Andrian Mouat的答案，我刚刚在文档中发现了一些东西。

它是在Docker运行引用中编写的：

与默认的桥模式相比，主机模式提供了更好的网络性能，因为它使用主机的本机网络堆栈，而桥必须通过docker后台进程进行一级虚拟化。

• 系统范围捕获30sec:sudo perf record-f 99-a-g--sleep 30
• 来自另一台物理计算机的AB测试:ab-n 50000-c 1000 http：//my-host-ip/（捕获时发生）

欲了解更多关于火焰图的信息，请访问Brendan Gregg的网站：www.brengregg.com/

此处为全貌

此处为全貌

缩放到nginx部分：