[dm-crypt] device-mapper problem

[dm-crypt] device-mapper problem

[Ali Reza Sajedi]

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Hello All,

I have cryptsetup 1.1.2 installed.

Everytime after a new boot when I try to execute a cryptsetup command I get the following error:

/proc/misc: No entry for device-mapper found
Is device-mapper driver missing from kernel?
Failaure to communicate with kernel device mapper driver.

The problem is solved after trying to load the module dm_mod with:

modprobe dm_mod

Inspite of loading the module this problem keeps coming with every system booting.

Has anyone any idea what fails in this case?

Thank you for you help.

Best regards

Ali 

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Re: [dm-crypt] device-mapper problem

[Milan Broz]

On 06/10/2010 11:31 AM, Ali Reza Sajedi wrote:
> Hello All,
>  
> I have cryptsetup 1.1.2 installed.
>  
> Everytime after a new boot when I try to execute a cryptsetup command I
> get the following error:
>  
> /proc/misc: No entry for device-mapper found
> Is device-mapper driver missing from kernel?
> Failaure to communicate with kernel device mapper driver.
>  
> The problem is solved after trying to load the module dm_mod with:
>  
> modprobe dm_mod
>  
> Inspite of loading the module this problem keeps coming with every
> system booting.

The dm_mod module must be loaded before using DM devices, so probably
this is missing from initramdisk init? Depends on distro.

Milan

Re: [dm-crypt] device-mapper problem

[Ali Reza Sajedi]

Dear Milan,

I use Ubuntu 8.10.

Why does the system not load the module automatically while booting.

Best regards

Ali

----- Original Message ----- 
From: "Milan Broz" <mbroz@redhat.com>
To: "Ali Reza Sajedi" <arsajedi@khanehjou.com>
Cc: <dm-crypt@saout.de>
Sent: Thursday, June 10, 2010 11:46 AM
Subject: Re: [dm-crypt] device-mapper problem


> On 06/10/2010 11:31 AM, Ali Reza Sajedi wrote:
>> Hello All,
>>  
>> I have cryptsetup 1.1.2 installed.
>>  
>> Everytime after a new boot when I try to execute a cryptsetup command I
>> get the following error:
>>  
>> /proc/misc: No entry for device-mapper found
>> Is device-mapper driver missing from kernel?
>> Failaure to communicate with kernel device mapper driver.
>>  
>> The problem is solved after trying to load the module dm_mod with:
>>  
>> modprobe dm_mod
>>  
>> Inspite of loading the module this problem keeps coming with every
>> system booting.
> 
> The dm_mod module must be loaded before using DM devices, so probably
> this is missing from initramdisk init? Depends on distro.
> 
> Milan
> _______________________________________________
> dm-crypt mailing list
> dm-crypt@saout.de
> http://www.saout.de/mailman/listinfo/dm-crypt

Re: [dm-crypt] device-mapper problem

[Milan Broz]

On 06/10/2010 12:42 PM, Ali Reza Sajedi wrote:
> I use Ubuntu 8.10.
> 
> Why does the system not load the module automatically while booting.

That's question for Ubuntu maintainers, dm_mod is probably needed
be loaded during init unconditionally.

Autoloading of code dm module will eventually change with some small
changes in udev and dm module, but this is not yet working.

Milan

Re: [dm-crypt] device-mapper problem

[Ali Reza Sajedi]

Dear Milan,

With cryptsetup 1.0.6 I hadn't this problem.

Could that be a problem in newer cryptsetup versions?

Ali

----- Original Message ----- 
From: "Milan Broz" <mbroz@redhat.com>
To: "Ali Reza Sajedi" <arsajedi@khanehjou.com>
Cc: "dm-crypt" <dm-crypt@saout.de>
Sent: Thursday, June 10, 2010 2:15 PM
Subject: Re: [dm-crypt] device-mapper problem


> On 06/10/2010 12:42 PM, Ali Reza Sajedi wrote:
>> I use Ubuntu 8.10.
>> 
>> Why does the system not load the module automatically while booting.
> 
> That's question for Ubuntu maintainers, dm_mod is probably needed
> be loaded during init unconditionally.
> 
> Autoloading of code dm module will eventually change with some small
> changes in udev and dm module, but this is not yet working.
> 
> Milan

Re: [dm-crypt] device-mapper problem

[Arno Wagner]

Should not be. In Debian, there is a file /etc/modules,
were you can put the names of modules to be loaded
automatically at startup time. Maybe just put 
dm_mod in there if it also exist on Ubuntu.

Arno

On Thu, Jun 10, 2010 at 02:27:29PM +0200, Ali Reza Sajedi wrote:
> Dear Milan,
>
> With cryptsetup 1.0.6 I hadn't this problem.
>
> Could that be a problem in newer cryptsetup versions?
>
> Ali
>
> ----- Original Message ----- From: "Milan Broz" <mbroz@redhat.com>
> To: "Ali Reza Sajedi" <arsajedi@khanehjou.com>
> Cc: "dm-crypt" <dm-crypt@saout.de>
> Sent: Thursday, June 10, 2010 2:15 PM
> Subject: Re: [dm-crypt] device-mapper problem
>
>
>> On 06/10/2010 12:42 PM, Ali Reza Sajedi wrote:
>>> I use Ubuntu 8.10.
>>>
>>> Why does the system not load the module automatically while booting.
>>
>> That's question for Ubuntu maintainers, dm_mod is probably needed
>> be loaded during init unconditionally.
>>
>> Autoloading of code dm module will eventually change with some small
>> changes in udev and dm module, but this is not yet working.
>>
>> Milan
> _______________________________________________
> dm-crypt mailing list
> dm-crypt@saout.de
> http://www.saout.de/mailman/listinfo/dm-crypt
>

-- 
Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno@wagner.name 
GnuPG:  ID: 1E25338F  FP: 0C30 5782 9D93 F785 E79C  0296 797F 6B50 1E25 338F
----
Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans

If it's in the news, don't worry about it.  The very definition of 
"news" is "something that hardly ever happens." -- Bruce Schneier 

Re: [dm-crypt] device-mapper problem

[Ali Reza Sajedi]

Dear Arno,

Thank you very much für your help.

The file /etc/modules also exists on Ubuntu.

Adding the entry "dm_mod" to the file has solved the problem.

Thank you.

Best regards

Ali
----- Original Message ----- 
From: "Arno Wagner" <arno@wagner.name>
To: <dm-crypt@saout.de>
Sent: Thursday, June 10, 2010 9:17 PM
Subject: Re: [dm-crypt] device-mapper problem


> Should not be. In Debian, there is a file /etc/modules,
> were you can put the names of modules to be loaded
> automatically at startup time. Maybe just put
> dm_mod in there if it also exist on Ubuntu.
>
> Arno
>
> On Thu, Jun 10, 2010 at 02:27:29PM +0200, Ali Reza Sajedi wrote:
>> Dear Milan,
>>
>> With cryptsetup 1.0.6 I hadn't this problem.
>>
>> Could that be a problem in newer cryptsetup versions?
>>
>> Ali
>>
>> ----- Original Message ----- From: "Milan Broz" <mbroz@redhat.com>
>> To: "Ali Reza Sajedi" <arsajedi@khanehjou.com>
>> Cc: "dm-crypt" <dm-crypt@saout.de>
>> Sent: Thursday, June 10, 2010 2:15 PM
>> Subject: Re: [dm-crypt] device-mapper problem
>>
>>
>>> On 06/10/2010 12:42 PM, Ali Reza Sajedi wrote:
>>>> I use Ubuntu 8.10.
>>>>
>>>> Why does the system not load the module automatically while booting.
>>>
>>> That's question for Ubuntu maintainers, dm_mod is probably needed
>>> be loaded during init unconditionally.
>>>
>>> Autoloading of code dm module will eventually change with some small
>>> changes in udev and dm module, but this is not yet working.
>>>
>>> Milan
>> _______________________________________________
>> dm-crypt mailing list
>> dm-crypt@saout.de
>> http://www.saout.de/mailman/listinfo/dm-crypt
>>
>
> -- 
> Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: 
> arno@wagner.name
> GnuPG:  ID: 1E25338F  FP: 0C30 5782 9D93 F785 E79C  0296 797F 6B50 1E25 
> 338F
> ----
> Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans
>
> If it's in the news, don't worry about it.  The very definition of
> "news" is "something that hardly ever happens." -- Bruce Schneier
> _______________________________________________
> dm-crypt mailing list
> dm-crypt@saout.de
> http://www.saout.de/mailman/listinfo/dm-crypt