nginx tuning
1.0.0
对于此配置，您可以使用自己喜欢的Web服务器，因为我主要与它一起使用Nginx。
通常，正确配置的Nginx每秒可以处理多达400k至500k的请求（聚类）。我看到的大多数是每秒50k至80k（非集群）请求和30％的CPU负载，当然，这是启用超线程的2 x Intel Xeon ，但在较慢的机器上可以毫无问题地工作。
您必须了解此配置是在测试环境中而不是在生产中使用的，因此您将需要找到一种方法来实现大多数这些功能，以适合您的服务器。
首先，您需要安装nginx
yum install nginx
apt install nginx备份原始配置，您可以开始重新配置您的配置。您需要使用您喜欢的编辑/etc/nginx/nginx.conf打开nginx.conf 。
# you must set worker processes based on your CPU cores, nginx does not benefit from setting more than that
worker_processes auto; #some last versions calculate it automatically
# number of file descriptors used for nginx
# the limit for the maximum FDs on the server is usually set by the OS.
# if you don't set FD's then OS settings will be used which is by default 2000
worker_rlimit_nofile 100000 ;
# only log critical errors
error_log /var/log/nginx/error.log crit ;
# provides the configuration file context in which the directives that affect connection processing are specified.
events {
# determines how much clients will be served per worker
# max clients = worker_connections * worker_processes
# max clients is also limited by the number of socket connections available on the system (~64k)
worker_connections 4000 ;
# optimized to serve many clients with each thread, essential for linux -- for testing environment
use epoll ;
# accept as many connections as possible, may flood worker connections if set too low -- for testing environment
multi_accept on ;
}
http {
# cache informations about FDs, frequently accessed files
# can boost performance, but you need to test those values
open_file_cache max=200000 inactive=20s;
open_file_cache_valid 30s ;
open_file_cache_min_uses 2 ;
open_file_cache_errors on ;
# to boost I/O on HDD we can disable access logs
access_log off ;
# copies data between one FD and other from within the kernel
# faster than read() + write()
sendfile on ;
# send headers in one piece, it is better than sending them one by one
tcp_nopush on ;
# don't buffer data sent, good for small data bursts in real time
# https://brooker.co.za/blog/2024/05/09/nagle.html
# https://news.ycombinator.com/item?id=10608356
#tcp_nodelay on;
# reduce the data that needs to be sent over network -- for testing environment
gzip on ;
# gzip_static on;
gzip_min_length 10240 ;
gzip_comp_level 1 ;
gzip_vary on ;
gzip_disable msie6;
gzip_proxied expired no-cache no-store private auth;
gzip_types
# text/html is always compressed by HttpGzipModule
text/css
text/javascript
text/xml
text/plain
text/x-component
application/javascript
application/x-javascript
application/json
application/xml
application/rss+xml
application/atom+xml
font/truetype
font/opentype
application/vnd.ms-fontobject
image/svg+xml;
# allow the server to close connection on non responding client, this will free up memory
reset_timedout_connection on ;
# request timed out -- default 60
client_body_timeout 10 ;
# if client stop responding, free up memory -- default 60
send_timeout 2 ;
# server will close connection after this time -- default 75
keepalive_timeout 30 ;
# number of requests client can make over keep-alive -- for testing environment
keepalive_requests 100000 ;
}现在您可以保存配置并运行以下命令
nginx -s reload
/etc/init.d/nginx start|restart
如果您想先测试配置，则可以运行
nginx -t
/etc/init.d/nginx configtest
server_tokens off ;这离安全的DDOS防御距离很远，但可以减慢一些小型DDO。此配置适用于测试环境，您应该使用自己的值。
# limit the number of connections per single IP
limit_conn_zone $binary_remote_addr zone=conn_limit_per_ip:10m;
# limit the number of requests for a given session
limit_req_zone $binary_remote_addr zone=req_limit_per_ip:10m rate=5r/s;
# zone which we want to limit by upper values, we want limit whole server
server {
limit_conn conn_limit_per_ip 10 ;
limit_req zone=req_limit_per_ip burst=10 nodelay;
}
# if the request body size is more than the buffer size, then the entire (or partial)
# request body is written into a temporary file
client_body_buffer_size 128k ;
# buffer size for reading client request header -- for testing environment
client_header_buffer_size 3m ;
# maximum number and size of buffers for large headers to read from client request
large_client_header_buffers 4 256k ;
# read timeout for the request body from client -- for testing environment
client_body_timeout 3m ;
# how long to wait for the client to send a request header -- for testing environment
client_header_timeout 3m ;现在您可以再次测试配置
nginx -t # /etc/init.d/nginx configtest然后重新加载或重新启动您的nginx
nginx -s reload
/etc/init.d/nginx reload|restart
您可以使用tsung测试此配置，当您对结果感到满意时，您可以点击Ctrl+C因为它可以运行几个小时。
nofile限制） - Linux在RHEL/CENTOS 7+中，有两种方法可以提高NINGINX的NINGINX限制ninginx的nofile/Max Open文件/文件描述符。在运行NGINX时，请检查主过程的当前限制
$ cat /proc/$(cat /var/run/nginx.pid)/limits | grep open.files
Max open files 1024 4096 files
ps --ppid $(cat /var/run/nginx.pid) -o %p|sed '1d'|xargs -I{} cat /proc/{}/limits|grep open.files
Max open files 1024 4096 files
Max open files 1024 4096 files
在{,/usr/local}/etc/nginx/nginx.conf中使用worker_rlimit_nofile指令尝试失败，因为selinux策略不允许setrlimit 。这显示在/var/log/nginx/error.log中
015/07/24 12:46:40 [alert] 12066#0: setrlimit(RLIMIT_NOFILE, 2342) failed (13: Permission denied)
type=AVC msg=audit(1437731200.211:366): avc: denied { setrlimit } for pid=12066 comm="nginx" scontext=system_u:system_r:httpd_t:s0 tcontext=system_u:system_r:httpd_t:s0 tclass=process
nolimit # /etc/security/limits.conf
# /etc/default/nginx (ULIMIT)
$ nano /etc/security/limits.d/nginx.conf
nginx soft nofile 65536
nginx hard nofile 65536
$ sysctl -p
nolimit $ mkdir -p /etc/systemd/system/nginx.service.d
$ nano /etc/systemd/system/nginx.service.d/nginx.conf
[Service]
LimitNOFILE=30000
$ systemctl daemon-reload
$ systemctl restart nginx.service
httpd_setrlimit到true（1）这将为工作过程设置FD限制。将worker_rlimit_nofile指令留在{,/usr/local}/etc/nginx/nginx.conf中，然后以root运行以下
setsebool -P httpd_setrlimit 1
默认情况下， max_ranges不限。 DOS攻击可以创建许多范围要求（对稳定性I/O的影响）。
| 套接字类型 | 潜伏期（MS） | 潜伏期stdev（MS） | CPU负载 |
|---|---|---|---|
| 默认 | 15.65 | 26.59 | 0.3 |
| accept_mutex关闭 | 15.59 | 26.48 | 10 |
| Reuseport | 12.35 | 3.15 | 0.3 |
目前仅在Linux中支持文件的多线程发送。如果没有sendfile_max_chunk限制，一个快速连接可能会完全抓住工作过程。
map $ssl_preread_protocol $upstream {
"" ssh.example.com:22;
"TLSv1.2" new.example.com:443;
default tls.example.com:443;
}
# ssh and https on the same port
server {
listen 192.168.0.1:443;
proxy_pass $upstream ;
ssl_preread on;
}openssl engine -t ）q_disc ）。tcp_bbr ： modprobe tcp_bbr && echo ' tcp_bbr ' >> /etc/modules-load.d/bbr.conf
echo ' net.ipv4.tcp_congestion_control=bbr ' >> /etc/sysctl.d/99-bbr.conf
# Recommended for production, but with Linux v4.13rc1+ can be used not only in FQ (`q_disc') in BBR mode.
echo ' net.core.default_qdisc=fq ' >> /etc/sysctl.d/99-bbr.conf
sysctl --system
