Crypttab and UUID / swap creation

Hi there,
the man page for crypttab(5) says that one can specify a block device via UUID= followed by the UUID. I tried this and this does NOT work, at least not with the default init system. (Maybe it works with systemd, I didn't try.) It works fine using the UUID path, like /dev/disk/by-uuid/<my_uuid>. Since I just changed the prefix UUID= to the path without touching the UUID itself, it is not likely to be a typo or any other user error. Is there anything wrong or it is a known bug?
Another question:
I generate my encrypted swap partition via crypttab. It works fine, but since it is created on each boot, it gets a different UUID each time. Is it possible to assign a fixed UUID to it using crypttab? mkswap offers this option (-U …) but I need something to pass it over from crypttab.
Thanks!
Last edited by silentsnake (2012-08-11 15:28:20)

silentsnake wrote:the man page for crypttab(5) says that one can specify a block device via UUID= followed by the UUID. I tried this and this does NOT work, at least not with the default init system. (Maybe it works with systemd, I didn't try.) It works fine using the UUID path, like /dev/disk/by-uuid/<my_uuid>. Since I just changed the prefix UUID= to the path without touching the UUID itself, it is not likely to be a typo or any other user error. Is there anything wrong or it is a known bug?
Looks like a bug to me (I see no code to deal with this in systemd, and initsrcipts does not deal with it either, so looks like a bug in the manpage). If you file a bug report I'll get back to it. Thanks for pointing it out!
I generate my encrypted swap partition via crypttab. It works fine, but since it is created on each boot, it gets a different UUID each time. Is it possible to assign a fixed UUID to it using crypttab? mkswap offers this option (-U …) but I need something to pass it over from crypttab.
This is not currently possible. Is there a reason not to use /dev/mapper/<the name of your device> ? If there is a reasonable usecase, I'd suggest submitting this upstream to systemd and I'll happily implement it for initsrcipts too (I don't want the two to diverge). Btw, there was a request for LABEL support in a similar way too, but no usecase was given so I didn't give it any more thought.

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Hi,
I've looked for some documentation explaining exactly how the pin and gate swap functionality works but I have not been successful.
I am trying to get pin and gate swapping working correctly on some digital logic components that I have created (side question - why no modern 74 series logic components like LVC?) as well as RPACKS and some connectors.
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Hi Pat,
I'm working with some SAMTEC connectors. I don't expect you guys to have these built by default in the library - they are somewhat custom. But just so you can consider it, we are using the TFM and T2M family of connectors and I'm adding them as additional footprints for the standard dual row headers. I'm having some trouble with the footprint for the TFM screw-down option since it is a very odd footprint, but I'm going to start a seperate thread discussion for that since I really just need to understand how to manipulate Ultiboard to get the desired result and it's really a different discussion.
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Thanks!
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Autorization of Sales District and Price List Creation to the User

Dear Experts,
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G serie fn and ctrl swap

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lenovo had a fn and ctrl swapping feature thingy in the bios but when I pressed
f2 as it was starting up, I don't see the function or the keyboard section. Is it
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edit : subject edited for common issue.

hey,
thanx for the info.
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my bios version is lenovo 29cn24ww v(1.07)
and my smbios version is 2.6
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update, their comp freezes up and won't boot up. O.O
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What is the best Apple notebook for video editing and pro music creation?

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Last edited by x-yuri (2013-06-12 13:20:29)

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Transaction VA01
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I got an iphone from apple store US and am located in egypt , the device has hardware issues and need swap as stated by apple stor belfast when i was in ireland but they cannot swap it in EU as it is purchased from US , please advice

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The warranty is valid in the original country of purchase:
http://www.apple.com/legal/warranty/products/iphone-english.html
Note:
IMPORTANT RESTRICTION
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I am currently experiencing a problem with my Apple Pro Keyboard (Model circa 2000 taken from a PowerMac G4). It used to work fine, except now ALT and COMMAND seem to be swapped.
COMMAND + Q instead of quitting, gives me this: œ
Here is the whole qwerty: œ∑´®†¥¨^øπåß∂ƒ©˙∆˚¬Ω≈ç√∫~µ
Useful if you want to type strange, but slowly frustrating, as frequent mac users will know keyboard shortcuts are deeply ingrained into reflexes and are hard to change.
Has anyone else experience a problem like this?
How can it be solved?
I have already tried several things: reconnecting keyboard, restarting, checking updates. No significant harware or software change either, it just started randomly.
I have also tried searching google with no luck, results are for different topics with the same search terms.
SEO helper text:
Problem with keyboard alt and command swapped.
Strange keyboard bug alt command mapped incorrectly.
Pro Keyboard alt command not working.
Thanks in advance.

*hangs head in shame*
You'd never guess where I didn't look*: system preferences.
Indeed the 'modier keys' were incorrectly mapped. So its now fixed.
...but I wonder what caused it to randomly switch?
[* That'd be because I'm developing 16 hours a day for my dissertation, it does crazy things to your head.]

System and System Alias Creation

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we have developed iViews in EP5. Now we want to migrate all our iViews to Ep6.. we have problem in EP6 for system and system alias creation..
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after creating systems in System.xml.. we will define all system properties in like router string ,client no,and system number for each sap system in JCODestination.xml ..
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and we will define the systems in default.properties file and we will use in the par development...
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your help will be required for me.. and appreciated to the great extent......
Thanks and Regards
Prasad.Y

After following the steps above in system landscape
please do the following to fill in the parameters
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Test Connection with Connector - Jan 1, 1970 2:35:42 PM
Test Details:
The test consists of the following steps:
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Results
Retrieval of default alias successful
Connection successful
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LE-TRM: automatic and immediate TASK creation at TO creation

Hi guys,
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I'd like to know how to get the following behavior in SAP LE-TRM (Task and Resource Management) module : automatic and immediate task creation in TRM at TO (transfer order) creation in LE.
Does anyone know how to set this up?
Thx a lot in advance for your valuable inputs.

Activate this BADI and set up Request Scheduler program as a background Job.
method IF_EX_LTRM_RQST_GLOBL_SCAN~RQST_GLOBL_SCAN.
TYPE-POOLS: TRMGC.
DATA: lt_where_tab   TYPE ltrqt_it_where,
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data: lv_pick(3).
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append lv_where_line to et_where_tab.
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lv_where_line = 'trmgc_rqact_replen, trmgc_rqact_move)'.
append lv_where_line to et_where_tab.
endmethod.

Stability Issues (Freezes) and Mount SWAP Partition during Boot

Hi,
i'm having the following 2 Issues:
1. Stability issues, The System freezes randomly an i have no hint to get rid of the freezes.
2. At bootyp the Swap Partition won't be mounted. If the bootup ist completet and i type "swapon -a" - everything ist ok
Because i'm a Newbie - i don't know how i could get rid of these Problems.
If you can tell me what i could try or what i schould check - please tell me.
thx
sash

karol wrote:Define 'freeze'. For how long, what were you doing at that time, does systemd's journal, htop or iotop show what could be the cause, do you have to reboot to make it go away?
Post your /etc/fstab.
thx for you answer. I think i have to explain what i mean with "freeze" --> the pc isn't responding, that mean - no key input, no ssh responding. The PC has noch Graphical interface, only console and is uptodate and acts at home as my "server" thats why i cant say what it is exactly doing.
I think the only way is to get all log-files and search for the issue - what logs do i have to check?
How could i check why my swap partition couldn't be activatet at startup, but after login and "swapon -a" everything is fine?
uname -a
Linux server 3.15.9-2-ck #1 SMP PREEMPT Fri Aug 8 03:02:21 EDT 2014 x86_64 GNU/Linux
/etc/fstab:
# UUID=0eb5dbfa-94af-4614-ab65-f223bc367b81 LABEL=Arch
/dev/mapper/enc-sda2 / btrfs rw,relatime,ssd,discard,space_cache,compress,subvol=__active 0 0
# /dev/mapper/enc-sda2 / btrfs rw,relatime,ssd,discard,space_cache,compress,subvol=__active 0 0
# UUID=7ff9cb11-3931-42c8-9987-d0512c50a26e LABEL=boot
/dev/sda1 /boot ext4 rw,relatime,data=ordered 0 2
# 640GB SWD Blue
/dev/mapper/enc-sdb1 /mnt/data1 btrfs rw,relatime,compress,autodefrag,subvol=data1 0 0
/dev/mapper/enc-sdb1 /mnt/timemachine btrfs rw,relatime,compress,autodefrag,subvol=timemachine 0 0
# 1TB
/dev/mapper/enc-sdc1 /mnt/data2 btrfs rw,relatime,space_cache,compress,autodefrag,subvol=data2 0 0
# 2TB
/dev/mapper/enc-sdd1 /mnt/backup btrfs rw,relatime,space_cache,compress,autodefrag,subvol=__active 0 0
# UUID=b9855c07-c383-42d0-b30f-ab3bfc60c8be LABEL=swap
/dev/mapper/enc-sda3 none swap defaults,discard 0 0
/etc/crypttab
enc-sda2 /dev/sda2 /root/key/root.key
enc-sda3 /dev/sda3 /root/key/root.key swap
enc-sdb1 /dev/sdb1 /root/key/root.key
enc-sdc1 /dev/sdc1 /root/key/root.key
enc-sdd1 /dev/sdd1 /root/key/root.key
And i decrypt my /root partition with a key on my usb-stick at boot-time.
Last edited by arch-sash (2014-08-10 15:05:06)

How to mount and use swap partition _only_ for hibernation ?

By "hibernation" I mean suspend to disk.
My disk is a bit poor in RAM and the dirsk is slow, so I want to prevent any swap use of my system.
AND I want to use hibernation, in order to boot fatser... and not to loose my workspace state.
With a swap partition, hibernation works nicely.
But any intensive web browser easily lealds to incresed memory usage, hence swap use.
I have lowered the swap priority in /etc/fstab, down to 1 (and even tried 0).
Still, I am not satisfied : If would like not to use swap at all but for hibernation.
My plan was hence :
1) disable the automatic swap mount at boot
2) add a systemd unit to only moutn before hibernation
The first part was easy : I added a "noauto" option in /etc/fstab. Great, no more mounted swap. But, as expected, no more successful hibernation.
Then I tried to create a custom systemd unit.
- first copy the unit file automatically generated by systemd in /run/systemd/generator/dev-....swap to /etc/systemd/system/
- and add "Before=sleep.target" line in the Unit section
Result file here :
> cat /etc/systemd/system/dev-disk-by\x2duuid-blablablabla.swap
[Unit]
Description=Swap required for hibernation
Before=sleep.target
[Swap]
What=/dev/disk/by-uuid/blablablablabla
Priority=5
>
Next step show be to enable it, but I first run a safety check :
> systemctl show dev-disk-by\x2duuid-blablablabla.swap
Id=dev-disk-by\x2duuid-blablablabla.swap
Names=dev-disk-by\x2duuid-blablablabla.swap
Requires=-.mount
Wants=system.slice
BindsTo=dev-disk-by\x2duuid-blablablabla.device
RequiredBy=swap.target
WantedBy=dev-disk-by\x2duuid-blablablabla.device
Conflicts=umount.target
Before=sleep.target umount.target swap.target
After=systemd-journald.socket dev-disk-by\x2duuid-blablablabla.device system.slice -.mount
RequiresMountsFor=/dev/disk/by-uuid/blablablabla
Description=Swap required for hibernation
LoadState=loaded
ActiveState=inactive
SubState=dead
FragmentPath=/etc/systemd/system/dev-disk-by\x2duuid-blablablabla.swap
UnitFileState=static
InactiveExitTimestampMonotonic=0
ActiveEnterTimestampMonotonic=0
ActiveExitTimestampMonotonic=0
InactiveEnterTimestampMonotonic=0
CanStart=yes
CanStop=yes
CanReload=no
CanIsolate=no
StopWhenUnneeded=no
RefuseManualStart=no
RefuseManualStop=no
AllowIsolate=no
DefaultDependencies=yes
>
The problem here is that, somehow, a RequiredBy=swap.target line is apaprently automatically added, and makes exactly NOT what I want.
I've been battling a bit with systemd, but so far I have no clue how to do this correctly.
Important : I wand a clean "official" way, not to do a "service" unit that calls an home-brewed script taht calls swapon. I can do that, but systemd should be able to do it better than me, and without any trick.

Hello and thank you all
@fdservices & @WonderWoofy :
In fact, I forgot to mentionned swappiness, just tought about mentionneing the swap priority which act at a very different level is only revelevant when you ahve several swap files.
I have already modified that setting since quite a long time... and it indeed makes the system behaviour so much better.
Honestly, I could do with it... that's what I am doing since a few months in fact, and it really largely improved the user experience.
Still, the setting only makes swapping unlikely, but does not forbid it.
@WonderWoofy & @lucke :
You may be right, I could satisfy with swapiness...
Still, my feeling is that swap at run-time is mostly a remeniscence of the time where having several megabytes of RAM was juste a fantasm. At that time, at least for some intensive operations, simulating more RAM thansk to the cheaper & slower disk capacity was really decisive for a good user experience... and to allow some operations like some huge compilations. My feeling is that today, with our Gigabytes of RAM on our desktop/laptop, the need is much lower. In fact a swap is probably counter-productive for SSD for example (fast, yes, but swap is by nature something you write quite often, reducing teh SSD lifetime significantly). And simulating extra RAM is also counter-productive with applications such as web browsers which handle large amount of memory to handle cache themselves; it causes memory pressure, hence trigger swapping and machien slowdown instead of trigerring their pseudo-smart memory cleaning mechanisms. Last but not least, it does not encourage any improvement on application memory needs and rationalisation.
In fact, unless when I compile huge programs, or on really-limited-memory (embedded) systems, or eventually if swap can be hosted on significantly faster-than-storage disks, I feel that swapping does not really improve the user experience and system performance... and in contrary reduces them by having to handle swapping on and off memory & cache pages.
SO that's why I want to try. It's OK if I fail, swappinees fixes most my user experience issue, but I try to solve my more "theorical" issue as well.
And honestly, it is also to lean & play a bit with systemd as well.
More to come, I have things partially working now. Partially for now, and maybe perfectly with your help ?

SCHEDULING AGREEMENT AND SCHEDULING LINE CREATION

Hello Guys,
I trying creating a scheduling agreement(SA) for vendor & material combination.
I have created a Scheduling agreement in ME31L then maintained in ME38.
In ME38 i have also mentioned the delivery date. when i am checking EKKO for Purchasing document , its created with the delivery date specified.
My question is how to create a schedule line ? Do we need to maintain a source list of that material, plant and vendor.
If we have the source list maintained, then what is the next step after SA is created and maintained.
Do we need to do MIGO? because i tested by creating one SA in ME31L and maintained in ME38. I mentioned the delivery date as today and when i checked EKKO table the Purchasing document is created.
Do i need to create a Purchase Order?
If no then do i need to do MIGO? If i need to do MIGO, for what reference do i need to do MIGO???
My client never maintained a Scheduling agreement, they want the scheduled lines to be created and sent to vendor and we need to receive the goods on specified delivery date.
Help will be appreciated.
Thanks.

Hi,
You need to make a distinction between the scheduling agreement (ME31L/ME32L) and the delivery schedule creation (ME38/ME84)
With ME31L you create the scheduling agreement. In the scheduling agreement which is created for a vendor you maintain the parts that you will order at this vendor, the target quantity that you will order over a certain period and the price.
In ME38 you use the scheduling agreement number that is created with ME31L to create schedule lines (manually). These schedule lines consist of a date and an quantity. This is the data that needs to be transmitted to the vendor and against which the vendor is shipping the ordered materials.
Once the vendor ships the materials you post the goods receipt in Migo against the scheduling agreement number.
That is the basic working of the scheduling agreement and the delivery schedule.
Now some remarks.
You need to set-up the required output conditions for transmitting the data to the vendor either via print, fax, email or EDI.
You can do this manually in each scheduling agreement and each release but typically you maintain the output condition records.
For scheduling agreement contract (ME31L) you use transaction MN07.
For the delivery schedule (ME38/ME84) you use transaction MN10.
In order for you to be able to post the goods receipt the delivery schedule needs to have been transmitted otherwise you will get a message that not requirement are found when trying to post goods receipt.
Also the goods receipt can only be posted if the requirements are valid on the day that you are performing MIGO. This means if you would post GR today then the open requirements in the scheduling agreement need to be for today or already from previous dates. The system will not allow you to post GR for quantities that are only due tomorrow (if this is required a user exit needs to be set-up).
If you want schedule lines created via MRP then you need to set-up a source list using ME01. You have to make sure that the MRP key is set to 2 in orer for the system to generate schedule lines and you also have to make sure that you have the correct MRP parameters set-up.
You can use ME84 to transmit the delivery schedule lines generated by MRP if no changes are required. With the ME84 you can transmit multiple releases at once, however this transaction can not be used to make manual changes to the MRP proposal.
The scheduling agreement offers lot's more possibilities but the above should get you going with the basics.
Hope this will help you on your way.

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