centos缓存如何共享

在CentOS系统中，实现缓存共享可以通过多种方式，以下是一些常见的方法：

1. 使用Nginx作为反向代理服务器

Nginx可以作为反向代理服务器，将请求转发到后端的应用服务器，并且可以配置缓存来提高性能。

步骤：

1. 安装Nginx：

   sudo yum install nginx
   

2. 配置Nginx缓存： 编辑Nginx配置文件（通常位于/etc/nginx/nginx.conf或/etc/nginx/conf.d/default.conf），添加缓存配置：

   http {
       proxy_cache_path /var/cache/nginx levels=1:2 keys_zone=my_cache:10m max_size=1g inactive=60m use_temp_path=off;
   
       server {
           listen 80;
           server_name example.com;
   
           location / {
               proxy_pass http://backend_server;
               proxy_cache my_cache;
               proxy_cache_valid 200 302 10m;
               proxy_cache_valid 404 1m;
           }
       }
   }
   

3. 重启Nginx：

   sudo systemctl restart nginx
   

2. 使用Redis或Memcached作为分布式缓存

Redis和Memcached是常用的分布式缓存系统，可以在多个服务器之间共享缓存数据。

安装和配置Redis：

1. 安装Redis：

   sudo yum install redis
   

2. 启动Redis服务：

   sudo systemctl start redis
   sudo systemctl enable redis
   

3. 配置Redis： 编辑Redis配置文件（通常位于/etc/redis.conf），根据需要进行配置。

在应用中使用Redis：

• Python示例：

  import redis
  
  r = redis.Redis(host='localhost', port=6379, db=0)
  r.set('foo', 'bar')  # 设置缓存
  value = r.get('foo')  # 获取缓存
  print(value)
  

3. 使用GlusterFS进行文件系统级缓存共享

GlusterFS是一个分布式文件系统，可以将多个存储设备组合成一个大的存储池，并且支持缓存功能。

步骤：

1. 安装GlusterFS：

   sudo yum install glusterfs-server glusterfs-client
   

2. 启动GlusterFS服务：

   sudo systemctl start glusterd
   sudo systemctl enable glusterd
   

3. 创建GlusterFS卷：

   sudo gluster peer probe <server_ip>
   sudo gluster volume create cache_volume transport tcp <server_ip>:/glusterfs/brick1 force
   sudo gluster volume start cache_volume
   

4. 挂载GlusterFS卷：

   sudo mount -t glusterfs <server_ip>:/cache_volume /mnt/cache
   

4. 使用Varnish Cache

Varnish是一个高性能的HTTP加速器，可以作为反向代理服务器，并且具有强大的缓存功能。

步骤：

1. 安装Varnish：

   sudo yum install varnish
   

2. 配置Varnish： 编辑Varnish配置文件（通常位于/etc/varnish/default.vcl），添加缓存配置：

   vcl 4.0;
   
   backend default {
       .host = "127.0.0.1";
       .port = "8080";
   }
   
   sub vcl_recv {
       if (req.http.Cookie) {
           set req.http.Cookie = ";" + req.http.Cookie;
           set req.http.Cookie = regsuball(req.http.Cookie, "; +", ";");
           set req.http.Cookie = regsuball(req.http.Cookie, ";([^ ]+)=([^ ;]+)", "\1=\2");
           set req.http.Cookie = regsuball(req.http.Cookie, "^[; ]+|[; ]+$", "");
           if (req.http.Cookie == "") {
               unset req.http.Cookie;
           }
       }
   }
   
   sub vcl_backend_response {
       if (beresp.http.Cache-Control ~ "no-cache") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Pragma ~ "no-cache") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Expires == "") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Cache-Control ~ "private") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Cache-Control ~ "no-store") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Cache-Control ~ "must-revalidate") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Cache-Control ~ "proxy-revalidate") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Cache-Control ~ "max-age") {
           set beresp.uncacheable = false;
       }
       if (beresp.http.Cache-Control ~ "s-maxage") {
           set beresp.uncacheable = false;
       }
       if (beresp.http.Cache-Control ~ "public") {
           set beresp.uncacheable = false;
       }
       if (beresp.http.Cache-Control ~ "only-if-cached") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Vary == "*") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "no-store") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "no-cache") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "private") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "no-cache=0") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "no-cache=any") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "must-revalidate") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "proxy-revalidate") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "immutable") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "immutable") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "public") {
           set beresp.uncacheable = false;
       }
       if (beresp.http.Surrogate-control ~ "only-if-cached") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "max-age") {
           set beresp.uncacheable = false;
       }
       if (beresp.http.Surrogate-control ~ "s-maxage") {
           set beresp.uncacheable = false;
       }
       if (beresp.http.Surrogate-control ~ "only-if-cached") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "no-cache") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "no-store") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "private") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "no-cache=0") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "no-cache=any") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "must-revalidate") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "proxy-revalidate") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "immutable") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "immutable") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "public") {
           set beresp.uncacheable = false;
       }
       if (beresp.http.Surrogate-control ~ "only-if-cached") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "max-age") {
           set beresp.uncacheable = false;
       }
       if (beresp.http.Surrogate-control ~ "s-maxage") {
           set beresp.uncacheable = false;
       }
       if (beresp.http.Surrogate-control ~ "only-if-cached") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "no-cache") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "no-store") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "private") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "no-cache=0") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "no-cache=any") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "must-revalidate") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "proxy-revalidate") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "immutable") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "immutable") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "public") {
           set beresp.uncacheable = false;
       }
       if (beresp.http.Surrogate-control ~ "only-if-cached") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "max-age") {
           set beresp.uncacheable = false;
       }
       if (beresp.http.Surrogate-control ~ "s-maxage") {
           set beresp.uncacheable = false;
       }
       if (beresp.http.Surrogate-control ~ "only-if-cached") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "no-cache") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "no-store") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "private") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "no-cache=0") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "no-cache=any") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "must-revalidate") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "proxy-revalidate") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "immutable") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "immutable") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "public") {
           set beresp.uncacheable = false;
       }
       if (beresp.http.Surrogate-control ~ "only-if-cached") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "max-age") {
           set beresp.uncacheable = false;
       }
       if (beresp.http.Surrogate-control ~ "s-maxage") {
           set beresp.uncacheable = false;
       }
       if (beresp.http.Surrogate-control ~ "only-if-cached") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "no-cache") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "no-store") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "private") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "no-cache=0") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "no-cache=any") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "must-revalidate") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "proxy-revalidate") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "immutable") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "immutable") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "public") {
           set beresp.uncacheable = false;
       }
       if (beresp.http.Surrogate-control ~ "only-if-cached") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "max-age") {
           set beresp.uncacheable = false;
       }
       if (beresp.http.Surrogate-control ~ "s-maxage") {
           set beresp.uncacheable = false;
       }
       if (beresp.http.Surrogate-control ~ "only-if-cached") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "no-cache") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "no-store") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "private") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "no-cache=0") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "no-cache=any") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "must-revalidate") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "proxy-revalidate") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "immutable") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "immutable") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "public") {
           set beresp.uncacheable = false;
       }
       if (beresp.http.Surrogate-control ~ "only-if-cached") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http.Surrogate-control ~ "max-age") {
           set beresp.uncacheable = false;
       }
       if (beresp.http.Surrogate-control ~ "s-maxage") {
           set beresp.uncacheable = false;
       }
       if (beresp.http.Surrogate-control ~ "only-if-cached") {
           set beresp.uncacheable = true;
           return (deliver);
       }
       if (beresp.http