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Change of UUID?

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  Change of UUID? Hans <hans.ullrich@loop.de> - 2016-09-23 17:50 +0200
    Re: Change of UUID? Felix Miata <mrmazda@earthlink.net> - 2016-09-23 19:00 +0200
      Re: Change of UUID? Hans <hans.ullrich@loop.de> - 2016-09-23 19:20 +0200
        Re: Change of UUID? Felix Miata <mrmazda@earthlink.net> - 2016-09-23 19:40 +0200
      Installer trases UUID of swap - was [Re: Change of UUID?] Richard Owlett <rowlett@cloud85.net> - 2017-01-06 16:50 +0100
        Re: Installer trases UUID of swap - was [Re: Change of UUID?] Darac Marjal <mailinglist@darac.org.uk> - 2017-01-06 17:30 +0100
          Re: Installer trases UUID of swap - was [Re: Change of UUID?] David Wright <deblis@lionunicorn.co.uk> - 2017-01-06 17:50 +0100
            Re: Installer trases UUID of swap - was [Re: Change of UUID?] Richard Owlett <rowlett@cloud85.net> - 2017-01-06 19:00 +0100
              Re: Installer trases UUID of swap - was [Re: Change of UUID?] Felix Miata <mrmazda@earthlink.net> - 2017-01-06 20:20 +0100
                Re: Installer trases UUID of swap - was [Re: Change of UUID?] Richard Owlett <rowlett@cloud85.net> - 2017-01-07 11:10 +0100
              Re: Installer trases UUID of swap - was [Re: Change of UUID?] David Wright <deblis@lionunicorn.co.uk> - 2017-01-06 22:50 +0100
                Re: Installer trases UUID of swap - was [Re: Change of UUID?] Keith Bainbridge <keithrbaugroups@gmail.com> - 2017-01-06 23:20 +0100
                Re: Installer trases UUID of swap - was [Re: Change of UUID?] Richard Owlett <rowlett@cloud85.net> - 2017-01-07 11:10 +0100
          Re: Installer trases UUID of swap - was [Re: Change of UUID?] Jonathan Dowland <jmtd@debian.org> - 2017-01-06 18:20 +0100
          Re: Installer trases UUID of swap - was [Re: Change of UUID?] Richard Owlett <rowlett@cloud85.net> - 2017-01-06 19:00 +0100
          Re: Installer trases UUID of swap - was [Re: Change of UUID?] Felix Miata <mrmazda@earthlink.net> - 2017-01-06 20:20 +0100
        Re: Installer trases UUID of swap - was [Re: Change of UUID?] David Wright <deblis@lionunicorn.co.uk> - 2017-01-06 17:50 +0100
          Re: Installer trases UUID of swap - was [Re: Change of UUID?] Richard Owlett <rowlett@cloud85.net> - 2017-01-06 19:30 +0100

#172710 — Change of UUID?

Hello list,

I need some help for understanding things.

On my EEEPC I am usiing encrypted partitions, also swap is encrypted (all 
luks), too.
When I ssuspend to disk, the memory is written to the encrypted swap 
partition, which is /dev/mapper/swap.

In /etc/uswsusp.conf the UUID is identically to the output of "blkid /dev/
mapper/swap".

BUT - Now the problem: From time to time the UUID of /dev/mapper/swap changes 
and is then of course different to the entry in /etc/uswsusp.conf. 

This means, the system sometimes inhibits to boot (after resume), as it does 
not find the resume device. It can then be started by adding "noresume" to the 
kernel commands.

So, what might change the UUID? I did not format swap or similar. The only 
thing I do from time to time is starting a livefile on this computer, buit this 
should not change the UUID, shouldn't it?

But maybe, I have misunderstood, how UUID's are created. The other 
partiitions, which are also encrypted, do NOT change.

Or is it a bug? 

Thanks for any help to enlightening me.

Best regards

Hans

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#172714

Hans composed on 2016-09-23 17:20 (UTC+0200):

> I need some help for understanding things.

> On my EEEPC I am usiing encrypted partitions, also swap is encrypted (all
> luks), too.
> When I ssuspend to disk, the memory is written to the encrypted swap
> partition, which is /dev/mapper/swap.

> In /etc/uswsusp.conf the UUID is identically to the output of "blkid /dev/
> mapper/swap".

> BUT - Now the problem: From time to time

Can you give an example of such time?

The Debian installer reformats an existing swap, which means it gets a new 
UUID, unless you go out of your way to prevent it from doing so.

> the UUID of /dev/mapper/swap changes
> and is then of course different to the entry in /etc/uswsusp.conf.

> This means, the system sometimes inhibits to boot (after resume), as it does
> not find the resume device. It can then be started by adding "noresume" to the
> kernel commands.

> So, what might change the UUID? I did not format swap or similar. The only
> thing I do from time to time is starting a livefile on this computer, buit this
> should not change the UUID, shouldn't it?

What do you mean by "starting a livefile"?

> But maybe, I have misunderstood, how UUID's are created. The other
> partiitions, which are also encrypted, do NOT change.

> Or is it a bug?

> Thanks for any help to enlightening me.
-- 
"The wise are known for their understanding, and pleasant
words are persuasive." Proverbs 16:21 (New Living Translation)

  Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata  ***  http://fm.no-ip.com/

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#172716

Hi Felix, 
> > BUT - Now the problem: From time to time
> 
> Can you give an example of such time?
> 

Sure, from time-to-time means 2-3 times a week, but randomly.

> The Debian installer reformats an existing swap, which means it gets a new
> UUID, unless you go out of your way to prevent it from doing so.

No, I did not install Debian, I am running this now for several years.
> 
> 
> What do you mean by "starting a livefile"?
> 
I mean something like this: 

blkid /dev/mapper/swap
/dev/maoper/swap  UUID="ba1b8eXXX-and-sop-on" TYPE="swap" PTTYPE="dos" 
PARTUUID="0007a381-05"

# /etc/uswsusp.conf(5) -- Configuration file for s2disk/s2both
resume device = /dev/disk/by-uuid/fd45123cf-and-so-on"
compress = y
early writeout = y
image size = 1908094484
RSA key file = /etc/uswsusp.key
shutdown method = platform

UUID's (anonymized by me) are different! 

Best

Hans

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#172718

Hans composed on 2016-09-23 19:10 (UTC+0200):

>> > BUT - Now the problem: From time to time

>> Can you give an example of such time?

> Sure, from time-to-time means 2-3 times a week, but randomly.

>> The Debian installer reformats an existing swap, which means it gets a new
>> UUID, unless you go out of your way to prevent it from doing so.

> No, I did not install Debian, I am running this now for several years.

>> What do you mean by "starting a livefile"?

> I mean something like this:

> blkid /dev/mapper/swap
> /dev/maoper/swap  UUID="ba1b8eXXX-and-sop-on" TYPE="swap" PTTYPE="dos"
> PARTUUID="0007a381-05"

> # /etc/uswsusp.conf(5) -- Configuration file for s2disk/s2both
> resume device = /dev/disk/by-uuid/fd45123cf-and-so-on"
> compress = y
> early writeout = y
> image size = 1908094484
> RSA key file = /etc/uswsusp.key
> shutdown method = platform

> UUID's (anonymized by me) are different!

Possible workaround:

1-recreate swap using -L to give swap a volume label
2-adjust Grub config to direct resume to LABEL instead of UUID
3-adjust fstab to mount swap by LABEL instead of UUID

If this succeeds, file a bug, maybe against device-mapper or multipath-tools.
-- 
"The wise are known for their understanding, and pleasant
words are persuasive." Proverbs 16:21 (New Living Translation)

  Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata  ***  http://fm.no-ip.com/

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#176372 — Installer trases UUID of swap - was [Re: Change of UUID?]

On 9/23/2016 11:52 AM, Felix Miata wrote:
> [snip]
>
> The Debian installer reformats an existing swap, which means it
> gets a new UUID, unless you go out of your way to prevent it from
> doing so.
>

I wish to go out of my way, so to speak.
Can you point me to "the road less traveled"?
My environment is a laptop dedicated to installing various 
configurations of Jessie. It is extremely annoying that only the 
last installed {and *most likely* to be removed} boots promptly - 
the other installs having problems with finding an invalid UUID. 
I gets worse as I occasionally install a system and its intended 
swap partition to a flash drive - effectively clobbering all 
installs on the laptop.
TIA

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#176374 — Re: Installer trases UUID of swap - was [Re: Change of UUID?]

On Fri, Jan 06, 2017 at 09:45:28AM -0600, Richard Owlett wrote:
>On 9/23/2016 11:52 AM, Felix Miata wrote:
>>[snip]
>>
>>The Debian installer reformats an existing swap, which means it
>>gets a new UUID, unless you go out of your way to prevent it from
>>doing so.
>>
>
>I wish to go out of my way, so to speak.
>Can you point me to "the road less traveled"?

My thoughts would be to mark the partition you wish to use as swap as 
"Do not use" in the installer. Then, on the first boot, add the 
partition manually to /etc/fstab:

UUID=...	none	swap	sw	0	0

If you then wish to use that swap without rebooting, run "swapon --all".

>My environment is a laptop dedicated to installing various 
>configurations of Jessie. It is extremely annoying that only the last 
>installed {and *most likely* to be removed} boots promptly - the other 
>installs having problems with finding an invalid UUID. I gets worse as 
>I occasionally install a system and its intended swap partition to a 
>flash drive - effectively clobbering all installs on the laptop.
>TIA
>
>

-- 
For more information, please reread.

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#176376 — Re: Installer trases UUID of swap - was [Re: Change of UUID?]

On Fri 06 Jan 2017 at 16:26:55 (+0000), Darac Marjal wrote:
> On Fri, Jan 06, 2017 at 09:45:28AM -0600, Richard Owlett wrote:
> >On 9/23/2016 11:52 AM, Felix Miata wrote:
> >>[snip]
> >>
> >>The Debian installer reformats an existing swap, which means it
> >>gets a new UUID, unless you go out of your way to prevent it from
> >>doing so.
> >>
> >
> >I wish to go out of my way, so to speak.
> >Can you point me to "the road less traveled"?
> 
> My thoughts would be to mark the partition you wish to use as swap
> as "Do not use" in the installer. Then, on the first boot, add the
> partition manually to /etc/fstab:
> 
> UUID=...	none	swap	sw	0	0
> 
> If you then wish to use that swap without rebooting, run "swapon --all".

It might save a lot of typing to use LABEL rather than UUID.
(Of course the necessity might be avoided with pre-seeding
about which I know little; I've probably installed Debian
fewer times than the OP has installed jessie in a day.)

> >My environment is a laptop dedicated to installing various
> >configurations of Jessie. It is extremely annoying that only the
> >last installed {and *most likely* to be removed} boots promptly -
> >the other installs having problems with finding an invalid UUID. I
> >gets worse as I occasionally install a system and its intended
> >swap partition to a flash drive - effectively clobbering all
> >installs on the laptop.

Cheers,
David.

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#176382 — Re: Installer trases UUID of swap - was [Re: Change of UUID?]

On 1/6/2017 10:48 AM, David Wright wrote:
> On Fri 06 Jan 2017 at 16:26:55 (+0000), Darac Marjal wrote:
>> On Fri, Jan 06, 2017 at 09:45:28AM -0600, Richard Owlett wrote:
>>> On 9/23/2016 11:52 AM, Felix Miata wrote:
>>>> [snip]
>>>>
>>>> The Debian installer reformats an existing swap, which means it
>>>> gets a new UUID, unless you go out of your way to prevent it from
>>>> doing so.
>>>>
>>>
>>> I wish to go out of my way, so to speak.
>>> Can you point me to "the road less traveled"?
>>
>> My thoughts would be to mark the partition you wish to use as swap
>> as "Do not use" in the installer. Then, on the first boot, add the
>> partition manually to /etc/fstab:
>>
>> UUID=...	none	swap	sw	0	0
>>
>> If you then wish to use that swap without rebooting, run "swapon --all".
>
> It might save a lot of typing to use LABEL rather than UUID.

IIRC the partitioning phase of installer does not allow 
specifying a label for the swap partition.

> (Of course the necessity might be avoided with pre-seeding
> about which I know little; I've probably installed Debian
> fewer times than the OP has installed jessie in a day.)

I rarely install Jessie more than twice a day ;)
Although I may have installed Squeeze 5 times in one day.

>
>>> My environment is a laptop dedicated to installing various
>>> configurations of Jessie. It is extremely annoying that only the
>>> last installed {and *most likely* to be removed} boots promptly -
>>> the other installs having problems with finding an invalid UUID. I
>>> gets worse as I occasionally install a system and its intended
>>> swap partition to a flash drive - effectively clobbering all
>>> installs on the laptop.
>
> Cheers,
> David.
>
>

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#176386 — Re: Installer trases UUID of swap - was [Re: Change of UUID?]

Richard Owlett composed on 2017-01-06 11:56 (UTC-0600):

> David Wright wrote:

>> It might save a lot of typing to use LABEL rather than UUID.

> IIRC the partitioning phase of installer does not allow
> specifying a label for the swap partition.

In context of $SUBJECT, it would seem opportunity for setting a label on swap 
has already been presented, and the problem has to do with a change. If a label 
already exists, that the installer can't create one should be irrelevant. (That 
is can't I consider a design flaw.) By deselecting swap in partitioning you 
maintain the status quo.
-- 
"The wise are known for their understanding, and pleasant
words are persuasive." Proverbs 16:21 (New Living Translation)

  Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata  ***  http://fm.no-ip.com/

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#176406 — Re: Installer trases UUID of swap - was [Re: Change of UUID?]

On 1/6/2017 1:16 PM, Felix Miata wrote:
> Richard Owlett composed on 2017-01-06 11:56 (UTC-0600):
>
>> David Wright wrote:
>
>>> It might save a lot of typing to use LABEL rather than UUID.
>
>> IIRC the partitioning phase of installer does not allow
>> specifying a label for the swap partition.
>
> In context of $SUBJECT, it would seem opportunity for setting a
> label on swap has already been presented,...

<chuckle> I got trapped in a mental rut. I now have a new mental 
outline of how to start from scratch when doing the first install 
of Linux on a new machine.

> ...  and the problem has to
> do with a change. If a label already exists, that the installer
> can't create one should be irrelevant. (That is can't I consider
> a design flaw.) By deselecting swap in partitioning you maintain
> the status quo.

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#176394 — Re: Installer trases UUID of swap - was [Re: Change of UUID?]

On Fri 06 Jan 2017 at 11:56:01 (-0600), Richard Owlett wrote:
> On 1/6/2017 10:48 AM, David Wright wrote:
> >(Of course the necessity might be avoided with pre-seeding
> >about which I know little; I've probably installed Debian
> >fewer times than the OP has installed jessie in a day.)
> 
> I rarely install Jessie more than twice a day ;)
> Although I may have installed Squeeze 5 times in one day.

I'm sorry. I was conflating "It has had as many as a half dozen clean
installs in a single day" with "a laptop: [...] whose HD has been
erased multiple times in ONE day [... and] has multiple installs
of Debian, primarily classed [into three categories]. But not all
jessie then.

Cheers,
David.

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#176397 — Re: Installer trases UUID of swap - was [Re: Change of UUID?]

[Multipart message — attachments visible in raw view] — view raw

Thanks folk.  You've explained what has been happening to me on my
multi-boot system, and given a solution in 1 session.

Keith Bainbridge

0447667468

keithrbaugroups@gmail.com

Sent from my APad

On 7 Jan 2017 08:48, "David Wright" <deblis@lionunicorn.co.uk> wrote:

> On Fri 06 Jan 2017 at 11:56:01 (-0600), Richard Owlett wrote:
> > On 1/6/2017 10:48 AM, David Wright wrote:
> > >(Of course the necessity might be avoided with pre-seeding
> > >about which I know little; I've probably installed Debian
> > >fewer times than the OP has installed jessie in a day.)
> >
> > I rarely install Jessie more than twice a day ;)
> > Although I may have installed Squeeze 5 times in one day.
>
> I'm sorry. I was conflating "It has had as many as a half dozen clean
> installs in a single day" with "a laptop: [...] whose HD has been
> erased multiple times in ONE day [... and] has multiple installs
> of Debian, primarily classed [into three categories]. But not all
> jessie then.
>
> Cheers,
> David.
>
>

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#176407 — Re: Installer trases UUID of swap - was [Re: Change of UUID?]

On 1/6/2017 3:43 PM, David Wright wrote:
> On Fri 06 Jan 2017 at 11:56:01 (-0600), Richard Owlett wrote:
>> On 1/6/2017 10:48 AM, David Wright wrote:
>>> (Of course the necessity might be avoided with pre-seeding
>>> about which I know little; I've probably installed Debian
>>> fewer times than the OP has installed jessie in a day.)
>>
>> I rarely install Jessie more than twice a day ;)
>> Although I may have installed Squeeze 5 times in one day.
>
> I'm sorry. I was conflating "It has had as many as a half dozen clean
> installs in a single day" with "a laptop: [...] whose HD has been
> erased multiple times in ONE day [... and] has multiple installs
> of Debian, primarily classed [into three categories]. But not all
> jessie then.

Any permutation you can think of, I've probably done it. My 
learning style is try it, it might even work ;)

>
> Cheers,
> David.
>
>

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#176379 — Re: Installer trases UUID of swap - was [Re: Change of UUID?]

[Multipart message — attachments visible in raw view] — view raw

I'd do exactly as Darac suggests, with one adjustment:

On Fri, Jan 06, 2017 at 04:26:55PM +0000, Darac Marjal wrote:
> My thoughts would be to mark the partition you wish to use as swap as "Do
> not use" in the installer. Then, on the first boot, add the partition
> manually to /etc/fstab:
> 
> UUID=...	none	swap	sw	0	0

I'd add a "mkswap /dev/disk/by-uuid/<whatever>" here, with one extra suggestion...

> If you then wish to use that swap without rebooting, run "swapon --all".

I would suggest exactly the above; except, I'd label the swap partition "swap"
(by adding "-L" in the mkswap invocation), use LABEL=swap in the fstab and set
that in *all* of the fstabs for each installed OS.


-- 
Jonathan Dowland
Please do not CC me, I am subscribed to the list.

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#176381 — Re: Installer trases UUID of swap - was [Re: Change of UUID?]

On 1/6/2017 10:26 AM, Darac Marjal wrote:
> On Fri, Jan 06, 2017 at 09:45:28AM -0600, Richard Owlett wrote:
>> On 9/23/2016 11:52 AM, Felix Miata wrote:
>>> [snip]
>>>
>>> The Debian installer reformats an existing swap, which means it
>>> gets a new UUID, unless you go out of your way to prevent it from
>>> doing so.
>>>
>>
>> I wish to go out of my way, so to speak.
>> Can you point me to "the road less traveled"?
>
> My thoughts would be to mark the partition you wish to use as
> swap as "Do not use" in the installer. Then, on the first boot,
> add the partition manually to /etc/fstab:
>
> UUID=...    none    swap    sw    0    0

Works a charm.
As I always use preseeding I'll have to investigate using a 
post-install script to automate the fixup. Haven't yet had need 
to learn how to use such a script.


>
> If you then wish to use that swap without rebooting, run "swapon
> --all".
>
>> My environment is a laptop dedicated to installing various
>> configurations of Jessie. It is extremely annoying that only
>> the last installed {and *most likely* to be removed} boots
>> promptly - the other installs having problems with finding an
>> invalid UUID. I gets worse as I occasionally install a system
>> and its intended swap partition to a flash drive - effectively
>> clobbering all installs on the laptop.
>> TIA
>>
>>
>

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#176384 — Re: Installer trases UUID of swap - was [Re: Change of UUID?]

Darac Marjal composed on 2017-01-06 16:26 (UTC):

> On Fri, Jan 06, 2017 at 09:45:28AM -0600, Richard Owlett wrote:

>> Felix Miata wrote:

>>>The Debian installer reformats an existing swap, which means it
>>>gets a new UUID, unless you go out of your way to prevent it from
>>>doing so.

>>I wish to go out of my way, so to speak.
>>Can you point me to "the road less traveled"?

> My thoughts would be to mark the partition you wish to use as swap as
> "Do not use" in the installer.
This is my routine ever since discovering the Debian installer's rudeness.

> Then, on the first boot, add the partition manually to /etc/fstab:

> UUID=...	none	swap	sw	0	0

As my swaps always have a label set, I use it, and not UUID=. UUIDs weren't made 
for humans.
-- 
"The wise are known for their understanding, and pleasant
words are persuasive." Proverbs 16:21 (New Living Translation)

  Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata  ***  http://fm.no-ip.com/

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#176377 — Re: Installer trases UUID of swap - was [Re: Change of UUID?]

On Fri 06 Jan 2017 at 09:45:28 (-0600), Richard Owlett wrote:
> On 9/23/2016 11:52 AM, Felix Miata wrote:
> >[snip]
> >
> >The Debian installer reformats an existing swap, which means it
> >gets a new UUID, unless you go out of your way to prevent it from
> >doing so.
> >
> 
> I wish to go out of my way, so to speak.
> Can you point me to "the road less traveled"?
> My environment is a laptop dedicated to installing various
> configurations of Jessie. It is extremely annoying that only the
> last installed {and *most likely* to be removed} boots promptly -
> the other installs having problems with finding an invalid UUID. I
> gets worse as I occasionally install a system and its intended swap
> partition to a flash drive - effectively clobbering all installs on
> the laptop.
> TIA

If all you use this laptop for is installing jessie, is it
necessary for you to have any swap available? Would that be
something worth knowing?

Cheers,
David.

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#176383 — Re: Installer trases UUID of swap - was [Re: Change of UUID?]

On 1/6/2017 10:44 AM, David Wright wrote:
> On Fri 06 Jan 2017 at 09:45:28 (-0600), Richard Owlett wrote:
>> On 9/23/2016 11:52 AM, Felix Miata wrote:
>>> [snip]
>>>
>>> The Debian installer reformats an existing swap, which means it
>>> gets a new UUID, unless you go out of your way to prevent it from
>>> doing so.
>>>
>>
>> I wish to go out of my way, so to speak.
>> Can you point me to "the road less traveled"?
>> My environment is a laptop dedicated to installing various
>> configurations of Jessie. It is extremely annoying that only the
>> last installed {and *most likely* to be removed} boots promptly -
>> the other installs having problems with finding an invalid UUID. I
>> gets worse as I occasionally install a system and its intended swap
>> partition to a flash drive - effectively clobbering all installs on
>> the laptop.
>> TIA
>
> If all you use this laptop for is installing jessie, is it
> necessary for you to have any swap available? Would that be
> something worth knowing?
>

Until doing an install to test Darac's suggestion, I haven't done 
an install since before Christmas. I admit that stability sets 
some sort of record for me ;) In general I doubt that I've 
actually have needed swap space.

I expect to go live on my Debian box very soon. I may make it 
before my Windows box has hardware failure.

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