目的：缓存nginx服务器的静态文件。如css,js,htm,html,jpg,gif,png,flv,swf，这些文件都不是经常更新。便于缓存以减轻服务器的压力。\
实现：nginx
proxy_cache可以将用户的请缓存到本地一个目录，当下一个请求时可以直接调取缓存文件，就不用去后端服务器去取文件了。\
配置：打开配置文件/usr/local/nginx/conf/nginx.conf
user www www;\
worker_processes 2;\
error_log /var/log/nginx_error.log crit;\
worker_rlimit_nofile 65535;\
events\
{\
use epoll;\
worker_connections 65535;\
}\
http\
{\
include mime.types;\
default_type application/octet-stream;\
server_names_hash_bucket_size 128;\
client_header_buffer_size 32k;\
large_client_header_buffers 4 32k;\
client_max_body_size 8m;\
sendfile on;\
tcp_nopush on;\
keepalive_timeout 0;\
tcp_nodelay on;\
fastcgi_connect_timeout 300;\
fastcgi_send_timeout 300;\
fastcgi_read_timeout 300;\
fastcgi_buffer_size 64k;\
fastcgi_buffers 4 64k;\
fastcgi_busy_buffers_size 128k;\
fastcgi_temp_file_write_size 128k;\
[ ##cache##\
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_temp_path /home/temp_dir;\
proxy_cache_path /home/cache levels=1:2 keys_zone=cache_one:200m
inactive=1d max_size=30g;\
##end##]\
gzip on;\
gzip_min_length 1k;\
gzip_buffers 4 8k;\
gzip_http_version 1.1;\
gzip_types text/plain application/x-javascript text/css
application/xml;\
gzip_disable \”MSIE [1-6]\.\”;\
log_format access \’\$remote_addr - \$remote_user
[\$time_local] \”\$request\” \’\
\’\$status \$body_bytes_sent \”\$http_referer\” \’\
\’\”\$http_user_agent\” \$http_x_forwarded_for\’;\
upstream appserver { \
server 192.168.1.251;\
}\
server {\
listen 80 default;\
server_name www.gangpao.com;\
[location ~
.*\.(gif|jpg|png|htm|html|css|js|flv|ico|swf)(.*) {\
proxy_pass http://appserver;\
proxy_redirect off;\
proxy_set_header Host \$host;\
proxy_cache cache_one;\
proxy_cache_valid 200 302 1h;\
proxy_cache_valid 301 1d;\
proxy_cache_valid any 1m;\
expires 30d;\
}\
location ~ .*\.(php)(.*){\
proxy_pass http://appserver;\
proxy_set_header Host \$host;\
proxy_set_header X-Real-IP \$remote_addr;\
proxy_set_header X-Forwarded-For
\$proxy_add_x_forwarded_for;]\
}\
access_log /usr/local/nginx/logs/www.gangpao.com.log;\
}\
}
红色部分是配置缓存的参数。\
说明：\
1、http段设置。\
proxy_temp_path /home/temp_dir;设置临时目录\
proxy_cache_path /home/cache levels=1:2 keys_zone=cache_one:200m
inactive=1d
max_size=30g;设置缓存目录为二级目录，共享内存区大小，非活动时间，最大容量，注意临时目录要跟缓存目录在同一个分区。\
2、server段设置\
请求静态文件设置。\
proxy_cache cache_one;设置缓存共享内存区块，也就是keys_zone名称。\
proxy_cache_valid 200 302 1h;设置http状态码为200,302缓存时间为1小时。\
expires 30d;设置失期时间，为30天\
请求动态文件设置。\
proxy_pass http://appserver;不进行缓存，直接转到后端服务器。\
测试：当客户端发起http请求时在服务器上会产一个缓存文件如\
/home/cache/0/b9/8bd841b1c44ee5b91457eb561e44eb90
