Re: [NFS] Export especific file extension

["\"Fábio Jr.\"" <fjuniorlista@gmail.com>]

Rob Gardner escreveu:
> F=E1bio Jr. wrote:
>> Rob Gardner escreveu:
>> =20
>>> F=E1bio Jr. wrote:
>>>   =20
>>>> Rob Gardner escreveu:
>>>> =20
>>>>     =20
>>>>> F=E1bio Jr. wrote:
>>>>>          =20
>>>>>> Hello all.
>>>>>>
>>>>>> Is there a way to export only some specific file extensions from=
=20
>>>>>> a directory, like exporting only the files in /home/fabio with=20
>>>>>> the .jpg extension?
>>>>>>                =20
>>>>> You could do this pretty easily by exporting a 'fuse' filesystem=20
>>>>> layered on top of your home directory.
>>>>>
>>>>> Rob Gardner
>>>>> HP
>>>>>
>>>>>            =20
>>>> Thanks Rob for the reply,
>>>>
>>>> This means that if I use this FUSE, I can export via NFS only the=20
>>>> file extension that I need? let me explain my problem, not really =
a=20
>>>> problem, but a doubt.
>>>>
>>>> I have one storage that have my aplication files. This storage is=20
>>>> mounted via NFS in my 3 aplication servers. Now I will put another=
=20
>>>> server, to serve only static files (jpg,png,css,js basically), and=
=20
>>>> though that maybe there is a way to export only these files from=20
>>>> the storage. The problem is that these files are not organized in=20
>>>> diferent folders.
>>>>
>>>> Maybe my first question doesn't explained my real necessity, but=20
>>>> your answer will make me search a little more about FUSE.
>>>>      =20
>>> I think your first question explained your need clearly. FUSE is a=20
>>> filesystem layer that lets you filter requests through a user=20
>>> program such as a python script. So, for instance, every time a=20
>>> process opens a file, a function is called in your script, and you=20
>>> can look at the name of the file being opened, and there decide=20
>>> whether or not to allow the file to be opened. I think this would=20
>>> solve your problem easily. Though all the storage is "exported",=20
>>> only files with certain names (ie, *.jpg, etc) could be opened. You=
=20
>>> could also decide which files get enumerated with readdir, etc.
>>>
>>> Rob Gardner
>>> HP
>>>
>>>
>>>    =20
>> Oh yes, I think I didn't understand you answer.. but now all became=20
>> clear in my mind. I'm afraid that using this solution maybe cause an=
=20
>> increase on storage processor load, because for every request the=20
>> script must be executed. I already have some issues with server=20
>> availability, and perhaps the solution of a problem becomes the=20
>> worsening of another.
>>
>> Still thanks for the reply and thanks for helping to clear my mind.
>
> It's a valid concern, but fuse does not "execute a script" for every=20
> operation. The script is always running, sort of like a server for th=
e=20
> pseudo-filesystem. Each requests causes a few lines in the script to=20
> be executed. There is no process creation and dispatch for each=20
> operation, only a process wakeup for each operation. It is=20
> impressively lightweight and it's worth trying before dismissing it a=
s=20
> a resource drain.
>
Hmm.. that's interesting, but, how many requests this script can handle=
?=20
This can vary in diferent systems or configs, or even can be measured?
> But anyway, here's another idea for you-- Export a new directory that=
=20
> contains links to only those the files you want to export.
>
Unfortunately, even if I wanted to, it's not possible to do this in my=20
scenario, since I have aprox. 4 milion files only in jpeg format in=20
different folders, not counting the other extensions. The major problem=
=20
was the planning phase, that not counted with so many files and not=20
prepared the files organization to better performance. But for smallers=
=20
systems, its a very good solution.

[]s

=46=E1bio jr.

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