Debian Installation :: Why Does 8.2 Change UUID Of Swap Drive
Dec 14, 2015
Been doing some installations in a newly upgraded machine where I'm setting up two instances of 8.2 in slightly different configurations.Installing from netinst AMD64 DVD with firmware non-free. First installation goes smooth as then the second changes the UUID of the swap partition, meaning that the first then can't find it. To add insult to injury the second installation doesn't install GRUB in the MBR of the HDD.
Nothing different or special about the installation which is standard graphical with manual allocation of previously set up partitions. I don't touch the swap drive in the partitioner - just point to the correct partitions for / and /home as I want them. This is exactly as I've done before, many times.Setup asks me if I want to install GRUB in MBR and I answer "No" (because it would otherwise load in MBR of sda where I want it on sdb) then point to sdb in the next screen. Again really nothing different to what I've done dozens of times.
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May 9, 2011
I have, as I have in the past, copy/pasted a partition using gparted to get a working OS to another place.
I have always done this in the past to a different drive. Never paid much attention to the UUID.
This time I did it on the same drive. The partitions have the same UUID. This is not a good thing.
The copied OS boots and mounts fine as I edited the fstab to go by /dev/sdxy (where x is the drive and y the partition). My grub uses a custom menu using symbolic menu entries so it goes by the partition definition instead of UUID too.
I would really like to change the UUID on that partition.
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Jun 5, 2010
Someone (not me) recently installed some new distros on my HD. It seems that during the installation my swap partition was reformatted and a new UUID was assigned to it. I have the following questions:
1. I know that I have to change the swap partition UUID in /etc/fstab and /boot/grub/menu.lst of the affected distros. Is there anything else that needs to be changed?
2. I presume a similar change has to be made to the Grub 2 configuration, for those distros that use Grub 2. I have no experience using Grub 2 so how do I make the change or where can I find instructions to do it?
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Dec 15, 2010
UUIDs make fstab hard to read, so.. Is it possible to use udev rules to prevent HDs to change device, instead of using UUID in /etc/fstab?
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Mar 29, 2010
I've just upgraded my wife's netbook to UNR 9.10. This seemed to go well and the netbook has been working fine since. Yesterday my daughter used the netbook with out any issues, but when my wife tried it halted during boot with:
Swap waiting for UUID: xxxxxxxxxxxxxx
After a couple of reboots it started working fine, but looking at /etc/fstab the entry for swap is different to the UUID shown in blkid Do I just update fstab with the UUID from blkid?
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Mar 15, 2015
I am running Wheezy as my main OS in the first drive in my desktop. I use the 2nd drive for data. I am trying to add another OS to multiboot. When I ran grub-update in Wheezy, I am getting device letter for the root device instead of UUID in grub.cfg, in the os-prober section. Like this
Code: Select allsearch --no-floppy --fs-uuid --set=root 6ee49a8e-a619-49c7-9f66-51a5ca9a48cc
linux /boot/vmlinuz-316-x86_64 root=/dev/sdb3
initrd /boot/initramfs-316-x86_64.img
In the same file, UUID was used for the existing kernels.
Code: Select alllinux /boot/vmlinuz-3.2.0-4-686-pae root=UUID=c2eecf02-d427-4f2e-9fd0-9db61256cbac ro quiet
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-3.2.0-4-686-pae
How can I get UUID instead of /dev/sdb3 for the 2nd OS?
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Apr 30, 2016
I installed Debian 8 Jessie with full disk encryption and chose to have everything on the same partition. After install, I notice that my 8GB laptop has a 16GB swap. Is there a way to reduce the swap to 8GB (or maybe 4) whilst not affecting the encryption?
I have a 1TB HDD so space is not an issue but I dislike such waste. The setup used LVM.
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Jan 31, 2010
all of a sudden my pc decided no to start anymore.YOu might be aware of the ide/sata driver problem, well it was the problem. I reinstalled grub with suse dvd and it went ok. Pc working properly. But then i tried to fix this once for all and changed the fstab options from /dev-by-id to uuid (all partitions : swap, /, /home etc ).Is uuid a definite solution ?Why is the pc not able to start from there ?
Since i moved the partitions with uuid option in fstab and even after reinstalling grub the pc is not starting anymore . It gives me the boot menu (linux suse/failsafe) and then a black screen left with no keyboard nor mouse available.
[Code]...
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May 2, 2010
Just added a DVD drive to a machine which had no drive before. When I boot I get the error about being unable to find the root drive by its UUID. If I unplug the DVD drive it boots as normal.
I'm guessing the root drive is getting a new name i.e /dev/sda2 instead of sda1 and thus a new UUID. How can I add the drive and fix the UUID issue in grub?
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Aug 23, 2010
I have a Nook ebook reader and would like it to automatically open a certain application when I plug it in.As standard it just opens a nautilus file browser.I cannot find any settings that will let me associate a drive name/uuid with a certain application and google results came up saturated with how to make bootable USB drives.The only solution I actually found was to make a .autorun script in the root of the drive to start my application, but it still requires user interaction and is not ideal since I would like to implement this across several machines with different users/applications.
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Jan 14, 2011
basically just wanting to find the UUID for my internal disc drive. Running Slackware 13.1
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Nov 13, 2010
is it safe to change fstab UUID entry for the system to /dev/sdb4? and after editing fstab, is there a script or command I need to run to release lock or update mount information? edit: I see not correct, and therefore not safe,but is there a format to tell linux to use /dev/sda1 instead of UUID= or label= .
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May 18, 2011
I have an mdadm linear array of 4 500GB drives. One of them had a few bad sectors, so I've dd'ed it to a new one (conv=noerror), and tried to start my array. Mdadm refuses, saying, "mdadm: /dev/md4 assembled from 3 drives - not enough to start the array."I had diffed different samples from different positions on the source and the mirror drive and confirmed they were identical. Checking the superblocks confirms three old drives still having their superblocks as expected, while the newly mirrored one has,
daniel@lnxsrv:~$ sudo mdadm --misc --examine /dev/sdf1
mdadm: No md superblock detected on /dev/sdf1.
- and,
daniel@lnxsrv:~$ sudo blkid /dev/sdf1
[code]....
As before. The mirror apparently has no uuid, but the original does. To confirm my sanity, I did,
daniel@lnxsrv:~$ sudo dd bs=1M count=50 if=/dev/sdc of=./sdc && sudo dd bs=1M count=50 if=/dev/sdd of=./sdd && sudo diff -s sdc sdd
50+0 records in
[code]...
How can the uuid not be the same when bit-for-bit from the very first byte of the drive, covering MFT etc., these two drives are identical according to diff?
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Aug 29, 2015
I am having trouble getting the ethernet to connect my pc to the lan.
now what i have done is install wheezzy jessie to a hdd on a ibm think pad i5 processor and hot swapped it to this pc with a pentium 4 which i am setting up as a raid server.
I have followed the debian manual to the letter with regards to editing the /etc/network/interfaces file but still it wont connect.
could it be a driver issue? the fact i hot swapped the drives from totally different systems?
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Oct 31, 2010
I am currently running 32 bit ubuntu in my PC with 2.5 GB RAM, Intel Pentium Dual Core inside. I am coming to debian soon. I will be installing 64 bit squeeze. Now I have 3 GB of swap space. I do satellite image processing. Therefore what is the recommended swap space for me with the kind of work I do. RAM is in very small amount but as of now I have to stay with it.
Also I am interested to know would KDE be an overkill for my machine. Will I run short of memory when I start image processing?
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Jul 14, 2010
I've been away from Fedora for a long time, since FC3/4. I seem to recall that at that time grub in Fedora used the standard drive notation such as /dev/sdax instead of the current UUID. Can anyone tell me why this change was made?
Seems to me that using UUIDs presents severe problems if a drive has to be replaced as the restore media (we all backup, don't we?) would not work without modification. How does one determine trhe UUID of a new drive to change the restore media? Sounds like a chickenand-egg routine. There must be some way which I haven't run accross yet. I do notice through experimentation that the standard notation still works, at least in /etc/fstab.
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Feb 12, 2015
I recently installed Debian 7.6 64-bit on Dell Vostro 1520 laptop.Using Gparted, create extended partition in the remaining disk space 67.91 GB
Install Debian 7.6 as follows
Code: Select all/dev/sdb5 / 8GB Ext4
/dev/sdb6 / home 17GB Ext4
/dev/sdb7 swap 5GB
I opened a terminal and ran some commands to show the results below....
Code: Select allroot@DELL-DEBIAN:/home/hugh# cat /proc/swaps
Filename Type Size Used Priority
/dev/sda7 partition 4979708 0 -1
root@DELL-DEBIAN:/home/hugh#
Code: Select allroot@DELL-DEBIAN:/home/hugh# cat /etc/fstab
# /etc/fstab: static file system information.
[code]...
I have a couple of questions....
1. Does the data above indicate everything is running as it should?
2. What does this command tell me about swap? "/sbin/swapoff /dev/sda7" I read somewhere it should be run on 64-bit system but not sure what it does.
3. Is the command "cat /proc/swaps" the best way to determine if swap is running ok?
4. Can I share this swap partition with another distro, e.g. Ubuntu or Xubuntu? as I would like to multi-boot for testing purposes.
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Jul 8, 2011
I cloned one of my hard drives to another, using Acronis True Image Home 2011.In the process, of course, fstab got copied verbatim from old to new.I then, using a livecd on a flash drive, mounted the new drive, went into fstab and rewrote the UUID's, using the numbers I'd gotten previously by doing sudo blkid.Now, the new drive had the UUID's revealed by that command.Then, I used boot-repair, from yannubuntu, to make that drive bootable, since it wasn't after the cloning and after the fstab rewrite.The drive is bootable, and it's mountable from a flash drive, or from the old drive.
I can access files either way.the fstab file on the new drive still has the old numbers, yet when I ran boot-repair, it apparently changed the UUID's for sectors 1 and 5 on the new drive.fstab seems to be irrelevant at this point, yet everything I read about it indicates that it is not only relevant, but necessary.I don't understand how I can be accessing the drive when the fstab contains UUID's that are no longer pertinent to any hardware on my system.
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Feb 27, 2015
After some years using OS X, I'm returning on Debian on my Macbook Pro in single boot.
I've bought a Samsung SSD (850 EVO 500Go) in order to replace the slow built-in HDD.
But I've earned about the need of repartition of writing operation on that kind of drives, and I'm concerned about swap partition.
I need swap (especially for Darktable, browsers and maybe Steam games), but I wonder if the usual swap partition (even with discard mount option) is really recommandable for SSD drives.
Actually, on Debian wiki and others, the usual recommandation is "if you have enough RAM, don't use swap or minimise swapiness to 1", but using of swap file is not mentioned.
Indeed, if I have only one "big" partition on the SSD drive and TRIM activated, the garbage collector (low level) built in chipet's SSD will optimize SSD life, but I don't know how the low level garbage collection works with multiple partition.
So there is my questions :
- Will SSD garbage collection will preserve the disc use even if I have a 2GB swap partition ?
- Will I'd use a swap file instead of swap partition (I don't really need to hibernate) ?
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Oct 29, 2014
Setting up a randomly passworded swap partition in Debian installer with the default settings (aes-xts-plain64 w/ AES-256 key strength) gives the following line in /etc/crypttab:
Code: Select all####_crypt /dev/#### /dev/urandom cipher=aes-xts-plain64,size=256,swap
However according to cryptsetup manpage when using XTS mode the key size must be doubled so in effect the 'size=256' parameter above is actually resulting in AES-128 strength, no? To get 256 bit key length the size option should be set to 512. Quote from cryptsetup manpage:
For XTS mode (a possible future default), use "aes-xts-plain" or better "aes-xts-plain64" as cipher specification and optionally set a key size of 512 bits with the -s option. Key size for XTS mode is twice that for other modes for the same security level.
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Mar 21, 2011
I was wondering. Up till now whenever I installed Linux I've either dual booted with Windows off 1 HDD, or installed straight Linux by itself. However, I recently purchased a second HDD for my computer, and was wondering how I could go about installing Debian on the second drive without messing with the windows drive? Right now I have Windows 7 installed on my 1TB drive, and would like to try and install Debian on my second (750GB) drive. Would it be possible to install Debian on the second drive, install grub on that drive's MBR so I could choose between Debian and Win7 without touching the MBR on the 1TB Windows drive?
I'm paranoid about messing up my Seven installation, but really want to be able to load into Debian as well.
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Jun 15, 2010
I have two encrypted partitions which I cannot find UUID numbers for.
/etc/crypttab looks like this:
[Code]....
and *sometimes this works, other times I have to edit the file and /etc/init.d/cryptdisks restart.
Obviously I should use UUIDs here and in fstab but blkid does not list those partitions
[Code]....
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Jun 30, 2011
I have a debian 6 system in my basement acting as a media server. Debian is on a separate HDD from the raid drives and there is one external drive. Under normal conditions the Debian HDD shows up as /dev/sdk and the external shows up as /dev/sdl, no problems here because I use UUID for mounting. The problem is sometimes this drive isn't picked up on restarts (its old and I think the issue is the power supply in the base of it, to be solved later) . This wouldn't be a problem but it some how shuffles the drive addresses and the Debian HDD becomes /dev/sde, this in turn messes up a script that does a weekly dd of that hard drive. I am only really worried about this for when I go on vacation and I wont be at home if the power goes out.
So, is there a way to address the entire hard drive (not just a partition) other than the dev file? Why did this change from Debian 5 to 6? I never had this problem before with 5.
In case you are wondering, I find it easier recover from an image rather than do a reinstall, then get all the updates and software, then put in all the backed up files.
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May 16, 2011
System Fossil age laptop, Debian testing with lilo. SymptomAfter an upgrade (2nd week May), custom kernel compiled, kernel panics on boot, saying unable to mount root drive. (or more precise, unable to mount whatever uuid device). Stock kernel can boot. Workaround Instead of uuid on kernel option, use prehistoric root=/dev/XXX.
edit:The kernel which panics is 2.6.38 (make oldconfig, all default answer from 2.5.32 config)Stock is 2.6.32 On 2.6.38 after boot with tweak, the command "uuid" looks good.
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Jan 19, 2016
I am running Debian 3.2.0-0.bpo.2-amd64 on hyper-v, my / volume ran out of space and is sitting at 100%, I have extended the disk size on hyper-v, however when I go to Fdisk I see duplicates of each disk.
I have total of 2 vhds on the vm, so I see 4 disks under fdisk. Here is the output of fdisk
root@apachevm:~# fdisk -l
Disk /dev/sda: 107.4 GB, 107374182400 bytes
255 heads, 63 sectors/track, 13054 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x0009bfe8
[CODE]....
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Sep 21, 2010
I am using Debian lenny (kernel 2.6.26-2-686).
I changed my menu.lst to use
root=UUID=<long uuid string>
instead of the good old
root=/dev/sd...
I did that because, if I boot with a usb drive attached to my computer, sda become sdb and therefor nothing works anymore since my friend Kernel can't mount it's root partition. BTW, it works wonders using the UUIDs. The story darkens each time there is a kernel update, dist-upgrade resets my menu.lst back using the /dev/sd... format. and BANG... no more booting again. I am good to change my menu.lst back each time.
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Feb 6, 2010
I run a headless Ubuntu 8.04 server, which acts as a web, email and file server. I am sticking with 8.04 as it is a LTS release and will upgrade to the next LTS when it is released.
I have two external USB drives, that I need to mount at boot. I have been using /etc/fstab up until now, with the following entries:
Code:
However, as I gather from doing searches is quite common, occasionally I get an error during boot (causing the system to drop to a recovery shell) because the USB drives take time to wake up and the system hasn't found them by the time it reads /etc/fstab.
From doing searches, it seems there is nothing you can do to fstab to fix this, so you need to mount them using an rc.local script instead, using:
Code:
The problem is, as I have two USB drives, their /dev/sdxx location changes between boots. I thus want to use UUID codes as I do in fstab, however I haven't found anything about this.
Does anyone know how I can use the mount command and UUID to mount a drive in rc.local and what options I have to use the mount the drive with the same options that I am using in my fstab entry? Obvisouly, I can't refer back to fstab using the mount command, because then I will still get the boot error issue if they are listed in fstab. And there is no space internally for the USB drives as there is already two internal drives.
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Aug 6, 2010
i want to set the shortcut so that alt+1,2,3or4 will swap between the desktops,
how do i do this i cant seem to find it under system->preferences
also how do i make it so when i scroll the middle mouse buttom on a windows title it goes to shade?
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Nov 25, 2010
How can I add more space to my drive since I only have 1gb of ram and plenty of hard drive space? Right now it does not seem to be utilizing the swap space very efficiently.
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Jun 24, 2011
Upon booting my LVM wheezy setup, I get
fsck.ext3: Unable to resolve 'UUID=theUUID'
where "theUUID" (without the quotes) is the UUID
I believe this is caused by me trying to get lvm to use the external /boot because when I had unmounted the external /boot, it was creating a /boot in root. So, I booted a live cd and mounted the external /boot where /boot in the root volume is supposed to be. Basically, I think the problem is that I need to make my /boot (which is the only ext3 partition in the entire system and I want it that way) "relate itself" to the lvm root so that it boots into the system. As mentioned earlier, in the live CD, I made the external /boot mount itself in the root's /boot but I don't know how to tell the system to do this on its own while booting without my assistance. I chrooted from the live cd which involved a lot of tedious stuff but basically the important stuff I did were:
grub-install /dev/sdb
update-grub
update-initramfs -u
P.S.I get the issue in the Subject of this topic by telling tune2fs to mark the external /boot, lvm / and /home partitions as "dirty."
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