Re[2]: Is it possible to set a ddns hostname to access a name-based virtual host?

2009-02-20 Thread hongyi . zhao 
On Saturday, February 21, 2009 at 5:45, k...@chrysler.com wrote:
> Hongyi Zhao wrote:
>> Hi all,
>>
>> Suppose a file named file.pdf stored in the following web location:   
>>
>> http://some_domain/path/to/file.pdf
>>
>> Where, the *some_domain* is a name-based virtual host.  In this case,
>> is it possible to set a ddns hostname, say through
>> http://www.changeip.net/, without using *some_domain* itself,  to
>> access this file?
>>
>>   
> DNS can only control what IP address the client connects to. It doesn't
> have any effect on the "Host:" header that is sent in the HTTP request,
> and that's what a webserver uses to identify the target site, in a 
> named-based virtual hosting context.

> I think you want to use a proxy with URL-rewriting capability. SQUID 
> seems to be capable of this.

> Possibly some browser add-on might have a URL-rewriting capability too,
> haven't looked into that.

Thank you for your pertinent recommendations.

Warmly regards,
-- 
Hongyi Zhao  
Xinjiang Technical Institute of Physics and Chemistry
Chinese Academy of Sciences 
GnuPG DSA: 0xD108493
2009-2-21

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Re[2]: [OT] Is it possible to set a ddns hostname to access a name-based virtual host?

2009-02-20 Thread hongyi . zhao 
On Saturday, February 21, 2009 at 0:31, mi...@acmeps.com wrote:
> This is actually off topic for BIND-users...

> hongyi.z...@gmail.com wrote:
>> On Friday, February 20, 2009 at 19:51, serge.fonvi...@gmail.com wrote:
>>> Hi,
>> 
>>> Is it possible to set a ddns hostname, say through
>>> http://www.changeip.net/ , without using *some_domain* itself, to 
>>> access this file? 
>> 
>>> Not entirely sure what you are actually trying to achieve.
>>> Could you provide a concrete example of the situations you are trying to 
>>> achieve?
>> 
>> Let me give an example to illustrate my problem:
>> 
>> In the following url, the prola.aps.org is a name-based  virtual host:
>> 
>> http://prola.aps.org/pdf/PRB/v1/i1/p1_1
>> 
>> On  the other hand, my institute has subscribed to prola and many other
>> journals, so I want to use some self-made and easy-to-memory hostnames for
>> each  of them.  For example, I want to use the following url to access
>> the above one:
>> 
>> http://myprola.myddns.org/pdf/PRB/v1/i1/p1_1

> I fail to see how the later is more "easy-to-memory" than the former, but...

I just take one for example, in my case, I've dozens of such hostnames
and,  if  can,  I'll make all of them have the same latter part, i.e.,
.myddns.org, thus "easy-to-memory".

>> 
>> Is this possible?
>> 

> Generally, no.  Virtual hosting involves setting, in almost all cases, a
> unique document root for each virtual host.  If you reference a file or
> location via a URI that uses a different hostname, then it either
> matches a different virtual host, or matches the default virtual host,
> but in either case the document root is almost certainly different, and
> thus the relative path (/pdf/PRB/v1/i1/P1_1 in your case) almost certain
> does not translate to the correct absolute path to get the right file or
> get you to the right generator, whatever the location references and/or
> triggers to send back content.

> You *must* reference the location using the same URI if you expect to
> see the same expected results.

Thanks  for  your  detailed  explanations.  Another issue: what do you
mean by saying URI?  What's the differences between URI and URL?

> Regards,
> Mike

> PS:  There are other maintenance problems with your approach too, but

What for example?

> you avoid those by just not even trying to do what you asked.


Regards,
-- 
Hongyi Zhao  
Xinjiang Technical Institute of Physics and Chemistry
Chinese Academy of Sciences 
GnuPG DSA: 0xD108493
2009-2-21

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Re: Question re separating caching and authoritative servers

2009-02-20 Thread Niall O'Reilly 
On Fri, 2009-02-20 at 13:07 -0500, John Wobus wrote:
> 
> Any especially good or bad practices? Things that have worked well
> or poorly? Right now, I'm leaning toward having the caching server
> transfer key zones.

Works for me.

Niall O'Reilly
University College Dublin IT Services


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Re: Exiting due to early fatal error

2009-02-20 Thread Kevin Darcy 

Lars Hecking wrote:

 BIND 9.4.3-P1, Solaris 8

 I'm trying to get a chroot setup to work following the instructions here
  http://www.boran.com/security/sp/bind9_20010430.html

# /usr/sbin/named -g -t /var/named/chroot
17-Feb-2009 12:05:56.789 starting BIND 9.4.3-P1 -g -t /var/named/chroot
17-Feb-2009 12:05:56.790 found 2 CPUs, using 2 worker threads
17-Feb-2009 12:05:56.793 ./main.c:506: unexpected error:
17-Feb-2009 12:05:56.793 isc_socketmgr_create() failed: file not found
17-Feb-2009 12:05:56.794 create_managers() failed: unexpected error
17-Feb-2009 12:05:56.794 exiting (due to early fatal error)
# 


 The log gives no indication which file is not found, and truss doesn't
 help either:

...
chroot("/var/named/chroot") = 0
chdir("/")  = 0
brk(0x0025CEF8) = 0
brk(0x0025EEF8) = 0
pipe()  = 6 [7]
fork1() = 10598
lwp_sigredirect(0, SIGWAITING, 0x)  Err#22 EINVAL
lwp_cond_wait(0xFF275548, 0xFF275558, 0xFF26EDB0) = 0
lwp_mutex_wakeup(0xFF275558)= 0
lwp_mutex_lock(0xFF275558)  = 0
lwp_mutex_wakeup(0xFF275558)= 0
lwp_mutex_lock(0xFF275558)  = 0
close(7)= 0
read(6, 0xFFBEFC0F, 1)  = 0
_exit(1)

 This bind was compiled for threads, and /dev/poll is not in the jail.
  

For a program like named which forks itself, "truss -f" is your friend.

I'm curious whether the child process is trying to open /dev/poll or not.

- Kevin


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Re: Question re separating caching and authoritative servers

2009-02-20 Thread Mark Andrews 

In message , John Wobus writes:
> What are the good ways to let your local caching server serve your
> own site's data even after a caching-server reboot during an Internet
> outage? If the caching server locates your own authoritative data
> through normal delgation channels, and cannot reach the roots and
> TLDs, then your own local clients could be unable to resolve names
> of local servers, etc.
> 
> Any especially good or bad practices? Things that have worked well
> or poorly? Right now, I'm leaning toward having the caching server
> transfer key zones.

That's reasonable.   The other alternative is to set up
stub zones which short circuit the resolution process.

> John Wobus

-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: mark_andr...@isc.org
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Re: Is it possible to set a ddns hostname to access a name-based virtual host?

2009-02-20 Thread Kevin Darcy 

Hongyi Zhao wrote:

Hi all,

Suppose a file named file.pdf stored in the following web location:   


http://some_domain/path/to/file.pdf

Where, the *some_domain* is a name-based virtual host.  In this case,
is it possible to set a ddns hostname, say through
http://www.changeip.net/, without using *some_domain* itself,  to
access this file?

  
DNS can only control what IP address the client connects to. It doesn't 
have any effect on the "Host:" header that is sent in the HTTP request, 
and that's what a webserver uses to identify the target site, in a 
named-based virtual hosting context.


I think you want to use a proxy with URL-rewriting capability. SQUID 
seems to be capable of this.


Possibly some browser add-on might have a URL-rewriting capability too, 
haven't looked into that.


- Kevin

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Question re separating caching and authoritative servers

2009-02-20 Thread John Wobus 

What are the good ways to let your local caching server serve your
own site's data even after a caching-server reboot during an Internet
outage? If the caching server locates your own authoritative data
through normal delgation channels, and cannot reach the roots and
TLDs, then your own local clients could be unable to resolve names
of local servers, etc.

Any especially good or bad practices? Things that have worked well
or poorly? Right now, I'm leaning toward having the caching server
transfer key zones.

John Wobus

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Re: [OT] Is it possible to set a ddns hostname to access a name-based virtual host?

2009-02-20 Thread Michael Milligan 
This is actually off topic for BIND-users...

hongyi.z...@gmail.com wrote:
> On Friday, February 20, 2009 at 19:51, serge.fonvi...@gmail.com wrote:
>> Hi,
> 
>> Is it possible to set a ddns hostname, say through
>> http://www.changeip.net/ , without using *some_domain* itself, to 
>> access this file? 
> 
>> Not entirely sure what you are actually trying to achieve.
>> Could you provide a concrete example of the situations you are trying to 
>> achieve?
> 
> Let me give an example to illustrate my problem:
> 
> In the following url, the prola.aps.org is a name-based  virtual host:
> 
> http://prola.aps.org/pdf/PRB/v1/i1/p1_1
> 
> On  the other hand, my institute has subscribed to prola and many other
> journals, so I want to use some self-made and easy-to-memory hostnames for
> each  of them.  For example, I want to use the following url to access
> the above one:
> 
> http://myprola.myddns.org/pdf/PRB/v1/i1/p1_1

I fail to see how the later is more "easy-to-memory" than the former, but...

> 
> Is this possible?
> 

Generally, no.  Virtual hosting involves setting, in almost all cases, a
unique document root for each virtual host.  If you reference a file or
location via a URI that uses a different hostname, then it either
matches a different virtual host, or matches the default virtual host,
but in either case the document root is almost certainly different, and
thus the relative path (/pdf/PRB/v1/i1/P1_1 in your case) almost certain
does not translate to the correct absolute path to get the right file or
get you to the right generator, whatever the location references and/or
triggers to send back content.

You *must* reference the location using the same URI if you expect to
see the same expected results.

Regards,
Mike

PS:  There are other maintenance problems with your approach too, but
you avoid those by just not even trying to do what you asked.

-- 
Michael Milligan   -> mi...@acmeps.com
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Re[4]: Is it possible to set a ddns hostname to access a name-based virtual host?

2009-02-20 Thread hongyi . zhao 
On Friday, February 20, 2009 at 22:15, serge.fonvi...@gmail.com wrote:
> Let me give an example to illustrate my problem:

> In the following url, the prola.aps.org is a name-based  virtual host:

> http://prola.aps.org/pdf/PRB/v1/i1/p1_1

> On  the other hand, my institute has subscribed to prola and many other
> journals, so I want to use some self-made and easy-to-memory hostnames for
> each  of them.  For example, I want to use the following url to access
> the above one:

> http://myprola.myddns.org/pdf/PRB/v1/i1/p1_1

> Is this possible?

> You can specify a domainalias for every virtualhost in the apache
> configuration (other http servers should support similar functionality)

I cann't figure it out.  I only have a web
client  such  as  ie  or firefox to access the above url?  Do you mean
that I must setup a local webserver, say by using apache to do that thing?

Regards,
-- 
Hongyi Zhao  
Xinjiang Technical Institute of Physics and Chemistry
Chinese Academy of Sciences 
GnuPG DSA: 0xD108493
2009-2-20

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Re: Re[2]: Is it possible to set a ddns hostname to access a name-based virtual host?

2009-02-20 Thread Serge Fonville 
>
> Let me give an example to illustrate my problem:
>
> In the following url, the prola.aps.org is a name-based  virtual host:
>
> http://prola.aps.org/pdf/PRB/v1/i1/p1_1
>
> On  the other hand, my institute has subscribed to prola and many other
> journals, so I want to use some self-made and easy-to-memory hostnames for
> each  of them.  For example, I want to use the following url to access
> the above one:
>
> http://myprola.myddns.org/pdf/PRB/v1/i1/p1_1
>
> Is this possible?
>

You can specify a domainalias for every virtualhost in the apache
configuration (other http servers should support similar functionality)
This has nothing to do with DNS since all dns does is translate the hostname
you type in to an IP address the computer uses to connect to.
Every http request contains a 'host' header that is used by the webserver to
determine the documentroot to serve.

Hope this helps.

Regards,

Serge Fonville
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Re: Is it possible to set a ddns hostname to access a name-based virtual host?

2009-02-20 Thread Sam Wilson 
In article , hongyi.z...@gmail.com wrote:

> On Friday, February 20, 2009 at 19:51, serge.fonvi...@gmail.com wrote:
> > Hi,
> 
> > Is it possible to set a ddns hostname, say through
> > http://www.changeip.net/ , without using *some_domain* itself, to 
> > access this file? 
> 
> > Not entirely sure what you are actually trying to achieve.
> > Could you provide a concrete example of the situations you are trying to 
> > achieve?
> 
> Let me give an example to illustrate my problem:
> 
> In the following url, the prola.aps.org is a name-based  virtual host:
> 
> http://prola.aps.org/pdf/PRB/v1/i1/p1_1
> 
> On  the other hand, my institute has subscribed to prola and many other
> journals, so I want to use some self-made and easy-to-memory hostnames for
> each  of them.  For example, I want to use the following url to access
> the above one:
> 
> http://myprola.myddns.org/pdf/PRB/v1/i1/p1_1
> 
> Is this possible?

This is what browser bookmarks are for, isn't it?

Sam
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Re[2]: Is it possible to set a ddns hostname to access a name-based virtual host?

2009-02-20 Thread hongyi . zhao 
On Friday, February 20, 2009 at 19:51, serge.fonvi...@gmail.com wrote:
> Hi,

> Is it possible to set a ddns hostname, say through
> http://www.changeip.net/ , without using *some_domain* itself, to 
> access this file? 

> Not entirely sure what you are actually trying to achieve.
> Could you provide a concrete example of the situations you are trying to 
> achieve?

Let me give an example to illustrate my problem:

In the following url, the prola.aps.org is a name-based  virtual host:

http://prola.aps.org/pdf/PRB/v1/i1/p1_1

On  the other hand, my institute has subscribed to prola and many other
journals, so I want to use some self-made and easy-to-memory hostnames for
each  of them.  For example, I want to use the following url to access
the above one:

http://myprola.myddns.org/pdf/PRB/v1/i1/p1_1

Is this possible?

Regards,
-- 
Hongyi Zhao  
Xinjiang Technical Institute of Physics and Chemistry
Chinese Academy of Sciences 
GnuPG DSA: 0xD108493
2009-2-20

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Re: Is it possible to set a ddns hostname to access a name-based virtual host?

2009-02-20 Thread Serge Fonville 
Hi,

> Is it possible to set a ddns hostname, say through
>
http://www.changeip.net/ , without using *some_domain* itself, to
>
access this file?
> 


Not entirely sure what you are actually trying to achieve.
Could you provide a concrete example of the situations you are trying to
achieve?

If you wan't the file to be accessible through multplile hosts
(differentaited through the host header, you need to configure the webserver
to handle these names.
If you wan't a hostname to be updated automatically when the server IP
address changes, you need to configure the approriate service to connect to
the ddns service.
If you want specifics about the ddns service provider, you should ask them.

>From changeip.net:

> Dynamic DNS gives you the ability to redirect your domain name to anywhere
> at any time.  Why wait 3 days for your ISP to update their DNS records
> when you can do it yourself, in seconds.  Get your free name now and it will
> be working within 5 minutes!
>

Hope this helps.

Regards,

Serge Fonville
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Is it possible to set a ddns hostname to access a name-based virtual host?

2009-02-20 Thread Hongyi Zhao 
Hi all,

Suppose a file named file.pdf stored in the following web location:   

http://some_domain/path/to/file.pdf

Where, the *some_domain* is a name-based virtual host.  In this case,
is it possible to set a ddns hostname, say through
http://www.changeip.net/, without using *some_domain* itself,  to
access this file?

-- 
.: Hongyi Zhao [ hongyi.zhao AT gmail.com ] Free as in Freedom :.
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