配置文件
nginx.conf 主配置文件
worker_processes 1;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
sendfile on;
keepalive_timeout 65;
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"'; access_log logs/access.log main;
#CDN Include
include proxy.conf;
include upstrem.conf;
include blog.biglittleant.cn.conf;
server {
listen 80;
server_name localhost;
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
}
}
cat proxy.conf
#CDN
proxy_temp_path /data/cdn_cache/proxy_temp_dir;
proxy_cache_path /data/cdn_cache/proxy_cache_dir levels=1:2 keys_zone=cache_one:50m inactive=1d max_size=1g;
proxy_connect_timeout 5;
proxy_read_timeout 60;
proxy_send_timeout 5;
proxy_buffer_size 16k;
proxy_buffers 4 64k;
proxy_busy_buffers_size 128k;
proxy_temp_file_write_size 128k;
proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_404;
[root@data-1-1 conf]# cat upstrem.conf
upstream blog.biglittleant.cn
{
server 192.168.56.102:80 weight=10 max_fails=3;
}[root@data-1-1 conf]#
[root@data-1-1 conf]# cat blog.biglittleant.cn.conf
server
{
listen 80;
server_name blog.biglittleant.cn;
access_log logs/blog.biglittleant.cn-access.log main;
location ~ .*\.(gif|jpg|png|html|htm|css|js|ico|swf|pdf)$
{
#Proxy
proxy_redirect off;
proxy_next_upstream http_502 http_504 http_404 error timeout invalid_header;
proxy_set_header Host $host;
proxy_set_header X-real-ip $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_pass http://blog.biglittleant.cn; #Use Proxy Cache
proxy_cache cache_one;
proxy_cache_key "$host$request_uri";
add_header Cache "$upstream_cache_status";
proxy_cache_valid 200 304 301 302 8h;
proxy_cache_valid 404 1m;
proxy_cache_valid any 2d;
}
location /
{
proxy_redirect off;
proxy_next_upstream http_502 http_504 http_404 error timeout invalid_header;
proxy_set_header Host $host;
proxy_set_header X-real-ip $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_pass http://blog.biglittleant.cn;
client_max_body_size 40m;
client_body_buffer_size 128k;
proxy_connect_timeout 60;
proxy_send_timeout 60;
proxy_read_timeout 60;
proxy_buffer_size 64k;
proxy_buffers 4 32k;
proxy_busy_buffers_size 64k; }
}
mkdir /data/cdn_cache -p
[root@data-1-1 nginx]# ps -ef |grep nginx
root 5620 1 0 21:31 ? 00:00:00 nginx: master process sbin/nginx
nginx 5621 5620 0 21:31 ? 00:00:00 nginx: worker process
nginx 5622 5620 0 21:31 ? 00:00:00 nginx: cache manager process
nginx 5623 5620 0 21:31 ? 00:00:00 nginx: cache loader process
查看进程发现多了两个cache进程，
通过上面的图得到如下结论
- 访问html的时候，不走缓存。
- 第一次访问图片的时候，cache是miss的状态。
- 第二次访问图片的时候，cache是hit的状态。
登录缓存服务器查看
分析nginx缓存过程
第一步：访问了两个URL：http://192.168.56.101/index.html,http://192.168.56.101/b.jpg。
第二步查看缓存目录：
[root@data-1-1 cdn_cache]# tree -A /data/cdn_cache/
/data/cdn_cache/
+-- proxy_cache_dir
| +-- 9
| | +-- a8
| | +-- f28e02e3877f3826567907bcb0ebea89
| +-- e
| +-- 88
| +-- 114250cf63938b2f9c60b2fb3e4bd88e
+-- proxy_temp_dir6 directories, 2 files
第三步：
缓存配置参数：
proxy_cache_path /data/cdn_cache/proxy_cache_dir levels=1:2
第四步查看缓存内容：
第五步：分析过程
通过对key加密
echo -n '192.168.56.101/index.html' |md5sum |awk '{print $1}'
114250cf63938b2f9c60b2fb3e4bd88e echo -n '192.168.56.101/b.jpg' |md5sum |awk '{print $1}'
f28e02e3877f3826567907bcb0ebea89分析结果：
- nginx根据配置
levels=1:2进行缓存。 - 其中1表示MD5的最后一位。
- 其中2表示MD5的倒数第三位和第三位。
- 一个冒号表示一层。
