Nginx系列（十二）——性能调整

Performance Tuning
调整性能

Automating Tests with Load Drivers
常用负载测试工具
JMeter, Locust,Gatling

Keeping Connections Open to Clients
http {
keepalive_requests 320;
keepalive_timeout 300s;
...
}

Keeping Connections Open Upstream
保持负载均衡链接
proxy_http_version 1.1;
proxy_set_header Connection "";
upstream backend {
server 10.0.0.42;
server 10.0.2.56;
keepalive 32;
}

Buffering Responses
缓冲响应，避免写响应到临时文件
response bodies:
server {
proxy_buffering on;
proxy_buffer_size 8k;
proxy_buffers 8 32k; #缓冲数量和缓冲大小
proxy_busy_buffer_size 64k;
...
}

Buffering Access Logs
缓冲请求日志，当系统负载高的时候
http {
access_log /var/log/nginx/access.log main buffer=32k flush=1m; #当日志占满32k的内容时才写入磁盘中，flush用于指定日志数据在内存中最长的存留时间
}

OS Tuning
调整系统参数
例如以下参数：
net.core.somaxconn #maximum number of connections
sys.fs.file_max #最大文件描述符/etc/security/limits.conf
worker_connections #nginx配置
worker_rlimit_nofile #nginx配置
net.ipv4.ip_local_port_range #端口范围