nginx作为Web服务器、或反向代理服务器都可以使用缓存
一、作为Web服务器
nginx可以通过 expires 指令来设置响应头的过期时间，实现浏览器缓存（Browser Caching），即浏览器在用户磁盘上对最近请求过的文档进行存储。
其中，下面两句是必须的。Passenger是一个Rails应用服务的管理工具，可以统一管理Rails进程的数量、生命周期、请求队列。root用来配置passenger所引导rails应用
root /home/autotest/zhangs_trunk2015/public;
passenger_enabled on;
完整配置信息
location / {
#root html;
#index index.html index.htm;
root /home/autotest/zhangs_trunk2015/public;
passenger_enabled on;
}
location ~.*\.(jpg|png|jpeg|gif){
root /home/autotest/zhangs_trunk2015/public;
passenger_enabled on;
expires max;
}
location ~(bootstrap.min.js|flat-ui.min.js|jquery.min.js|bootstrap.min.css|flat-ui.min.css|flat-ui-icons-regular.woff){
root /home/autotest/zhangs_trunk2015/public;
passenger_enabled on;
expires 1d;
}
二、作为反向代理服务器
此时的缓存文件是保存到nginx所在的服务器，减少访问web服务器的次数，由nginx直接返回请求的信息，减小web服务器压力
http://appserver指web服务器的域名
user www www;
worker_processes 2;
error_log /var/log/nginx/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=1:2keys_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 blog.slogra.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 /var/log/nginx/blog.slogra.com.log;
}
}