架构--缓存知识

缓存体系是根据http体系来写的

 

 

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nginx代理缓存配置   mkdir -p /data/cdn_cache   ---------------------------------------------------------------------------------------------------------- [root@linux-node1 ~]#/etc/nginx/conf.d/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@linux-node1 ~]# /etc/nginx/conf.d/upstream.conf   upstream www.example.com.pool {         server 192.168.56.12:8080 weight=10 max_fails=3; } ---------------------------------------------------------------------------------------------------------- [root@linux-node1 ~]# vim /etc/nginx/conf.d/www.example.com.conf   server {     listen 80;     server_name www.example.com;     access_log logs/www.example.com-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 $proxy_add_x_forwarded_for;         proxy_pass    http://www.example.com;       #Use Proxy Cache     proxy_cache cache_one;     proxy_cache_key "$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://www.example.com;                 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;       } }     ------------------------------------------------------------------------------------------------ [root@linux-node2 ~]  vim vhost.example.com.conf server {         listen 8080;         server_name www.example.com;         location / {             root /data/www/www;             index index.html index.htm;         }         error_log    logs/error_www.example.com.log error;         access_log    logs/access_www.example.com.log    main; }   windoes 绑定主机名访问 www.example.com，返回node1服务器发现有缓存了

 如果用户访问后就回有缓存，但是如果网页文件跟新了，但是用户还是访问的缓存这样就回出现问题，则需要删缓存流程：

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#!/bin/bash   cache_purge(){ PURGE_URL=$1     URL_NAME=$(echo -n $PURGE_URL | md5sum | awk '{print $1}')     FILE_NAME=$(echo $URL_NAME  | awk '{print "/data/cdn_cache/proxy_cache_dir/"substr($0,length($0),1)"/"substr($0,length($0)-2,2)"/"$0}')     rm -rf $FILE_NAME }   purge_file(){         PURGE_FILE=$1         for url in $(cat $PURGE_FILE);do                 cache_purge $url         done }   purge_url(){         PURGE_URL=$1         cache_purge $PURGE_URL }   usage(){         echo $"Usage: $0 <url_file | 'url'>" }   main (){         if [ "$#" -ne 1 ];then                 usage;         else                 if [ -f $1 ];then                         purge_file $1;                 else                         purge_url $1;                 fi         fi }   main $1

[root@node1 ~]# sh a.sh www.example.com/index.html

通过MD5的方式找到缓存池的缓存，并把缓存删了

####web缓存

操作码缓存 ----php配置可以开启opcache     http://www.php.net/manual/zh/book.opcache.php

                                                                     http://www.php.net/manual/zh/opcache.configuration.php

web服务器缓存--apache(mod_cache),nginx(fastCGI缓存，proxy cache)

 

####应用层

                    ｜----动态内容缓存      缓存动态输出

应用服务---  ｜----页面静态化          动态页面静态化，需要专门用于静态化的CMS

　　　　　  ｜----local   cache        应用本地缓存，php(yac,xcache) java (ehcache)

                   

                    ｜----分布式缓存         mamcache,radis等 

数据层-----   ｜----数据库mysql       mysql自身缓存，innodb缓存，MYISAM缓存

                                           

系统层-----   ｜---操作系统-----cpu cache    L1（数据缓存，指令缓存）L2 L3

                                         -----内存 cache  内存高速缓存，page cache 

物理层-----    ｜ ----raid卡-----raid cache  磁盘整列缓存（raid卡可以控制是否实用磁盘高速缓存）

                     ｜ ----磁盘  ---- disk cache 磁盘高速缓存