[root@localhost ~]# vim /usr/local/nginx/conf/nginx.conf

user  www www;worker_processes  8;                                                                                                 error_log  logs/error.log crit;pid        logs/nginx.pid;worker_rlimit_nofile 65535;                                                                                                 events {    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 300m;                                                                                                     sendfile        on;    tcp_nopush     on;    tcp_nodelay on;    keepalive_timeout  65;                                                                                                     client_body_buffer_size 512k;    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;                                                                                                     gzip  on;    gzip_min_length 1k;    gzip_buffers 4 16k;    gzip_http_version 1.1;    gzip_comp_level 2;    gzip_types text/plain application/x-javascript text/css application/xml;    gzip_vary on;                                                                                                 #注：proxy_temp_path和proxy_cache_path指定的路径必须在同一分区    proxy_temp_path /data/proxy_temp_dir;    proxy_cache_path /data/proxy_cache_dir levels=1:2 keys_zone=cache_one:200m inactive=1d max_size=30g;#设置Web缓存区名称为cache_one，内存缓存空间大小为200MB，1天清理一次缓存，硬盘缓存空间大小为30G                                                                                                     upstream web_proxy_cache {        server 192.168.56.113:80 weight=1 max_fails=2 fail_timeout=30s;        server 192.168.56.114:80 weight=1 max_fails=2 fail_timeout=30s;    }                                                                                                     server {        listen       80;    server {        listen       80;        server_name  192.168.56.120;        root   /data/web/www;        index  index.html index.htm;                                                                                                         location / {        proxy_next_upstream http_502 http_504 error timeout invalid_header;# 如果后端的服务器返回502、504、执行超时等错误，自动将请求转发到upstream负载均衡池中的另一台服务器，实现故障转移                                                                                                         proxy_cache cache_one;        proxy_cache_valid 200 304 12h;   #对不同的HTTP状态码设置不同的缓存时间                                                                                                 # 以域名、URI、参数组合成Web缓存的Key值，Nginx根据Key值哈希，存储缓存内容到二级缓存目录内        proxy_cache_key $host$uri$is_args$args;        proxy_set_header Host $host;        proxy_set_header X-Forwarded-For $remote_addr;        proxy_pass http://web_proxy_cache;        expires 1d;        }                                                                                                 # 用于清除缓存，假设一个URL为http://192.168.56.120/test.txt，通过访问http://192.168.56.120/purge/test.txt就可以清除该URL的缓存。        location ~ /purge(/.*) {  # 设置只允许指定的IP或IP段才可以清除URL缓存                allow 127.0.0.1;                allow 192.168.56.0/24;                deny all;                proxy_cache_purge cache_one $host$1$is_args$args;        }                                                                                                         location ~ .*\.(php|jsp|cgii)?$ {  # 扩展名以.php、.jsp、.cgi结尾的动态应用程序不缓存                proxy_set_header Host $host;                proxy_set_header X-Forwarded-For $remote_addr;                proxy_pass http://web_proxy_cache;                }        access_log off;    }}

四、通过日志查看HIT 情况

1、开启日志

log_format main '$remote_addr - $remote_user [$time_local] "$request" ''$status $body_bytes_sent "$http_referer" ''"$http_user_agent" "$http_x_forwarded_for" ''"$upstream_cache_status"';access_log logs/access.log main;

4、计算HIT命中概率