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Posted to users@httpd.apache.org by "Rose, John B" <jb...@utk.edu> on 2014/08/08 15:51:56 UTC
[users@httpd] Rewrite and automount question
We have experimented with using Rewrite to replace /~someuser with /someuser
However there is a problem with systems using automounter in the case of an http request for a non-existing http://someserver.com/someuser
Anyone have a way to implement the above without doing undesired automount attempts of a non-existent "someuser"?
Thanks
Re: [users@httpd] Rewrite and automount question
Posted by Nick Kew <ni...@webthing.com>.
On 8 Aug 2014, at 14:51, Rose, John B wrote:
> We have experimented with using Rewrite to replace /~someuser with /someuser
How very 1997.
> However there is a problem with systems using automounter in the case of an http request for a non-existing http://someserver.com/someuser
That's your filesystem. Apache has no knowledge of whether a directory
exists until it performs a lookup. And it's the lookup that triggers the automount.
Check your NFS options.
Using NFS with apache - or anywhere exposed to the public 'net -
is not encouraged. Not good for either security or performance.
> Anyone have a way to implement the above without doing undesired automount attempts of a non-existent "someuser"?
Most simply, make sure AllowOverride is set to None.
You could also see if mod_cache helps, and if it doesn't
then you've diagnosed a major inefficiency in your server.
But mod_cache will only reduce, not eliminate, NFS accesses.
--
Nick Kew
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Re: [users@httpd] Re: Rewrite and automount question
Posted by "Rose, John B" <jb...@utk.edu>.
"What's automounter? Is that some process that mounts a user's home directory on a remote share or something?"
Yes. But only when it is requested. I.e. When you login via ssh, or access a web site via http whose content is in the remote filesystem, etc. You may refer to it as autofs.
From: Rich Bowen <rb...@rcbowen.com>>
Reply-To: "users@httpd.apache.org<ma...@httpd.apache.org>" <us...@httpd.apache.org>>
Date: Friday, August 8, 2014 3:24 PM
To: "users@httpd.apache.org<ma...@httpd.apache.org>" <us...@httpd.apache.org>>
Subject: Re: [users@httpd] Re: Rewrite and automount question
On 08/08/2014 11:59 AM, Rose, John B wrote:
mod_userdir does not seem to cause superfluous automounter attempts when an http request to a non-existent web address, http://website.com/~someuser, is received
Is there some way to implement that mechanism with http://website.com/someuser http requests for a nonexistent "someuser"?
What's automounter? Is that some process that mounts a user's home directory on a remote share or something?
I suppose you could query a list of valid users on server startup, and use that (via mod_macro or something?) to generate a list of Alias directives? Or possibly use a RewriteMap to do the same thing based on a list of users, although RewriteMap can be a bit of a performance bottleneck.
--Rich
From: <Rose>, John Rose <jb...@utk.edu>>
Date: Friday, August 8, 2014 9:51 AM
To: "users@httpd.apache.org<ma...@httpd.apache.org>" <us...@httpd.apache.org>>
Subject: Rewrite and automount question
We have experimented with using Rewrite to replace /~someuser with /someuser
However there is a problem with systems using automounter in the case of an http request for a non-existing http://someserver.com/someuser
Anyone have a way to implement the above without doing undesired automount attempts of a non-existent "someuser"?
Thanks
--
Rich Bowen - rbowen@rcbowen.com<ma...@rcbowen.com> - @rbowen
http://apachecon.com/ - @apachecon
Re: [users@httpd] Re: Rewrite and automount question
Posted by Rich Bowen <rb...@rcbowen.com>.
On 08/08/2014 11:59 AM, Rose, John B wrote:
> mod_userdir does not seem to cause superfluous automounter attempts
> when an http request to a non-existent web address,
> http://website.com/~someuser, is received
>
> Is there some way to implement that mechanism with
> http://website.com/someuser http requests for a nonexistent "someuser"?
What's automounter? Is that some process that mounts a user's home
directory on a remote share or something?
I suppose you could query a list of valid users on server startup, and
use that (via mod_macro or something?) to generate a list of Alias
directives? Or possibly use a RewriteMap to do the same thing based on a
list of users, although RewriteMap can be a bit of a performance bottleneck.
--Rich
>
> From: <Rose>, John Rose <jbrose@utk.edu <ma...@utk.edu>>
> Date: Friday, August 8, 2014 9:51 AM
> To: "users@httpd.apache.org <ma...@httpd.apache.org>"
> <users@httpd.apache.org <ma...@httpd.apache.org>>
> Subject: Rewrite and automount question
>
> We have experimented with using Rewrite to replace /~someuser with
> /someuser
>
> However there is a problem with systems using automounter in the case
> of an http request for a non-existing http://someserver.com/someuser
>
> Anyone have a way to implement the above without doing undesired
> automount attempts of a non-existent "someuser"?
>
> Thanks
>
>
--
Rich Bowen - rbowen@rcbowen.com - @rbowen
http://apachecon.com/ - @apachecon
Re: [users@httpd] Rewrite and automount question
Posted by "Rainer M. Canavan" <ra...@sevenval.com>.
On Aug 8, 2014, at 17:59 , "Rose, John B" <jb...@utk.edu> wrote:
> mod_userdir does not seem to cause superfluous automounter attempts when an http request to a non-existent web address, http://website.com/~someuser, is received
>
> Is there some way to implement that mechanism with http://website.com/someuser http requests for a nonexistent "someuser"?
mod_userdir probably checks if the user actually exists. You'll have
to implement something equivalent with RewriteCond(s) like
RewriteCond %{DOCUMENT_ROOT}$1 -d
Adjust as needed to verify that the user (or his home directory)
actually exists. You could also run a cron job every night and check
if ~user/public_html exists and build a RewriteMap or use a script
as an external rewriting program for a RewriteMap.
rainer
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[users@httpd] Re: Rewrite and automount question
Posted by "Rose, John B" <jb...@utk.edu>.
mod_userdir does not seem to cause superfluous automounter attempts when an http request to a non-existent web address, http://website.com/~someuser, is received
Is there some way to implement that mechanism with http://website.com/someuser http requests for a nonexistent "someuser"?
From: <Rose>, John Rose <jb...@utk.edu>>
Date: Friday, August 8, 2014 9:51 AM
To: "users@httpd.apache.org<ma...@httpd.apache.org>" <us...@httpd.apache.org>>
Subject: Rewrite and automount question
We have experimented with using Rewrite to replace /~someuser with /someuser
However there is a problem with systems using automounter in the case of an http request for a non-existing http://someserver.com/someuser
Anyone have a way to implement the above without doing undesired automount attempts of a non-existent "someuser"?
Thanks