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Reverse proxy cache

tip

推荐 nginx - poor man's cdn.

  • varnish
    • 默认内存缓存
    • 可 mmap 为文件 - 所有缓存在一起 - 重启会失效
    • pro 版本更多存储选项
  • nginx
    • proxy_cache_path
    • 逐文件缓存 - 重启后还是有效
    • 文件名为 md5(cache_key)
    • 默认 levels=3
  • haproxy - cache
    • 内存缓存
    • total-max-size
    • max-object-size
    • max-age
    • http-request cache-use mycache
    • http-response cache-store mycache
    • Cache 要求
      • HTTP 1.1 GET 200
    • HTTP cache improvements haproxy#214
  • jiangwenyuan/nuster

Varnish​

varnishd -a 127.0.0.1:8080 -b 185.199.109.153:80 -T 127.0.0.1:6082 -d -S $PWD/varnish-secret
# 因为 -d 所以需要手动启动
varnishadm -S $PWD/varnish-secret -T 127.0.0.1:6082 start

curl -H 'Host: wener.me' 127.0.0.1:8080

NGINX​

user nginx;

worker_processes auto;
pcre_jit on;
error_log /dev/stdout warn;

events {
    worker_connections 1024;
}

http {
  # https://serverfault.com/a/912897
  # HIT, MISS, BYPASS, EXPIRED
  log_format cache_st '$remote_addr - $upstream_cache_status [$time_local]  '
                    '"$request" $status $body_bytes_sent '
                    '"$http_referer" "$http_user_agent"';
  access_log /dev/stdout cache_st;

  proxy_cache_path  /tmp/nginx-cache levels=1:2 keys_zone=static:8m max_size=1000m inactive=600m;
  proxy_temp_path /tmp/nginx-cache-tmp;


  server {
    listen 8080;

    location / {
      proxy_pass http://185.199.109.153;
      proxy_set_header Host $host;
      proxy_cache static;
      proxy_cache_valid  200 302  60m;
      proxy_cache_valid  404      1m;
    }
  }
}
nginx -c $PWD/nginx.conf -g 'daemon off;'

HAProxy​

frontend http
  mode http
  bind 0.0.0.0:8080 name v4
  default_backend gh
backend gh
  http-request cache-use mycache
  http-response cache-store mycache
  server svr 185.199.109.153:80 check

cache mycache
  total-max-size 4095   # MB
  max-object-size 10000 # bytes
  max-age 30            # seconds

HTTP Cache 类型​

  • Page cache - 通常为 HTML
  • Browser cache - 资源
  • Object cache - 数据库查询
  • Bytecode cache - PHP, JS
  • CDN cache - HTML, Image, CSS, JS
  • Reverse proxy cache - 发生在反向代理层

Caching​

  • Cloudflare
    • 基于 extension 缓存而不是 mime
      • 默认不缓存 html
    • 可通过 Page Rule 添加缓存
      • 缓存所有 - Page Rule
        • charts.wener.tech/*
        • Cache Level: Cache Everything
    • 默认会缓存 robots.txt
    • CF-Cache-Status
      • DYNAMIC - 认为是动态内容，不会缓存
curl -I -H 'Host: charts.wener.tech' 185.199.108.153/wener/index.yaml
curl -I https://charts.wener.tech/wener/index.yaml