将NGINX的Cache放在内存里

1. 修改/etc/fstab挂接内存文件系统,并指定selinux context
tmpfs                   /var/cache/nginx        tmpfs   defaults,size=100m,context=system_u:object_r:httpd_cache_t:s0
然后mount /var/cache/nginx

2. 指定nginx的proxy_temp_path
  proxy_temp_path /var/cache/nginx/proxy;
  proxy_store /var/cache/nginx/store/${host}${original_uri};