Ubuntu :: Encrypted Swap Partition?

Jul 1, 2010

I read an article earlier that suggested the swap partition is encrypted by default if you select an encrypted /home folder during installation, is that true (for Lucid)? I am suspecting it isn't because my hibernation works, which I believe shouldn't be the case?

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OpenSUSE Install :: Swap Partition : Need To Check Swap File System?

Mar 20, 2011

Does one need to Check the Swap filesystem, from time to time

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Ubuntu :: Encrypted Swap And Suspend-to-disk

Feb 15, 2010

I have installed ubuntu via the alternate installer, activating encrypted home directories, which in turn enabled to have encrypted swap partitions and disabled hibernation (suspend-to-disk). I understand the arguments for having an encrypted swapspace in these cases. However, I'd like to be nevertheless able to hibernate. Now that the system is already set up, I cannot change and completely encrypt my harddisk via LUKS+LVM as it is suggested in numerous places.Instead, I tried the following. I created two swap partitions (sda7 and sda: one being encrypted via cryptsetup, to be used as a 'real' swap (sda7). Another without encryption, which is not listed in /etc/fstab, so that it is not normally used by the system. I have then configured uswsusp in order to use sda8 as a resume partition:


I have decided to encrypt the resume image - I don't care entering a password once every time I resume, it just shouldn't be at every boot. And this way, I can have hibernation without the uncomfortable solution of having my decrypted, open files on the disk as clear text. However, as sda8 is not 'mounted' when I want to suspend, I get the following error:


When I try to suspend now, it works. The image seems to get correctly written to sda8. However, on reboot, the image does not seem to be detected and the system is not resuming. I end up with a fresh login screen. would be also to unmount sda8 upon resume, is this better done by entering a hook in /etc/pm/sleep.d or can I just continue in the wrapper script above by executing s2disk.unwrapped only by calling it (without 'exec'), and entering a swapoff line behind it?

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Ubuntu Security :: Encrypted Swap Misconfiguration - Again

Feb 21, 2011

i started on the "Installation & Upgrades" Forum. So this is basically a repost. I configured an encrypted swap during the installation process of my kubuntu maverick using the manual install CD. I do not use LVM. This worked fine but I made the mistake of assigning a password to the encrypted swap. I would like to change this in favor for a random key. I tried to change /etc/crypttab in the following way:


Now the system still asks for a password for sda7_crypt at startup, but does not recognize the old password. It seems that the swap gets a random key and works fine anyway, so I really want to remove only the question for the PW at boot time. This is not a big issue, but it is annoying. When the system is up I can do swapoff and swapon without problems and no password is needed. Directly after boot swap works:


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Ubuntu :: Stop Bootup Password For Encrypted Swap?

May 8, 2010

I've set up a Lucid system with software RAID and encryption, with three encrypted partions - swap (/dev/md1), the root filesystem (/dev/md2), and /home (/dev/md3). The unencrypted /boot partition is /dev/md0.

This works well but the passphrase had to be entered three times at bootup. Obviously it would be preferable to enter the passphrase once to unlock the root partition, then have the others unlocked via key files. So I added key files to the swap and home partitions and modified /etc/crypttab to use them:

md1_crypt UUID=8066adbc-584c-4766-b188-bc2a7b61a2f0 /root/keys/swap-key luks,swap
md2_crypt UUID=bac82294-f3b9-45e4-89ad-407cf8b19b7b none luks
md3_crypt UUID=7d82a0b7-c811-4cc3-9fe7-1961c74b5ff2 /root/keys/home-key luks
The key files are owned by root and have 0400 protection. (The /root/keys


Since the swap partition is no longer referenced in fstab or crypttab, why is there still a bootup password prompt for it? What else needs to be done to stop it?

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Slackware :: File Permission About Encrypted Swap

May 28, 2010

I use the follow command to create a encrypted swap:

bash# echo "cryptswap /dev/sda5 none swap" >> /etc/crypttab
and edit the 'fstab' file :

/dev/sda6 / ext4 defaults 1 1
/dev/mapper/cryptswap swap swap defaults 0 0

That's work fine, but I found the permission of '/dev/mapper/cryptswap' is like this:

hello@world:~$ ls -l /dev/mapper/cryptswap
brw-rw-r-- 1 root disk 253, 4 2010-05-28 12:55 /dev/mapper/cryptswap
Other users can read the file '/dev/mapper/cryptswap', does it harm the system's security ?

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Debian :: Reduce Swap Size On Encrypted Drive?

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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OpenSUSE Install :: Change Encrypted Swap Passphrase?

Feb 23, 2011

I've chosen to encrypt my swap partition while I was installing opensuse 11.3 on my PC.
I want to know how I can change its password(passphrase)?

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Debian Installation :: Installer Incorrectly Setting Crypttab For Encrypted Swap?

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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Ubuntu :: Delete Snow Leopard Partition - Format Swap Disk Partition To Something Else

Feb 23, 2011

I had a drive with a partition layout like so:

~50gig Windows 7 - NTFS
~100gig Ubuntu - EXT3
~100gig Snow Leopard - HFS+
~100gig Extended Partition
-- ~100gig Swap Disk - exFat

I wanted to delete the Snow Leopard partition and format the Swap Disk partition to something else. exFat was causing major file size bloat on small files. QT sdk bloated to like 11 gigs or something ridiculous like that. Anyways, I loaded up an Ubuntu 10.04 LTS live cd and gparted then deleted the Snow Leopard partition. Gparted said "Mission Accomplished" and tried to rescan the drive, but never found it. At this point I restarted the computer, a dell laptop, which didn't boot with an unable to find a bootable device error. The ubuntu live cd doesn't see the drive anymore. gparted scans for drives indefinitely and fdisk -l has no output.

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Hardware :: Invalid Partition Table For Swap Partition That Moved With Gparted?

Feb 8, 2010

I was reading another thread about someone with a bad partition table and I decided to join this forum. I'm not going to take any drastic actions with the partition (/dev/sda3) in question. I am going to wait for instructions on what to do first. I am not very good with Linux and need some hand holding. System: DELL 4550 Dual-Booted with XP and Ubuntu. Works OK, just no swap. Well, here's what I did: I deleted a partition for Windows XP Pro because it was a trial, and it ran out. I then decided to slide the swap partition for the Ubuntu Linux that I dual-boot into over. (If this was successful, I was going to try expanding the root partition to take up the unused space.) I used Gparted on a CD to do this, as I figured it was safe to do.

I now cannot mount the swap space at bootup (and have to go into a backup version of the OS), although I can use Gparted in Linux to execute the "swapon" command, and it appears that it worked because I now see "swapoff" as an option on the context menu. (I actually don't even need a swap partition, except to hibernate.) If I highlight the swap partition and click on "Drive" on Gparted's menu bar and select "Create Partition Table", it will erase all data on /dev/sda, so how do I fix the bad partition table non-destructively?

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Debian Installation :: Wiped Windows Partition With Swap And LVM Partition

Jan 17, 2015

I am having issues with Grub 2 after installing Debian 7.8.0.The computer is a HP Pavilion 500-307nb. I made the original harddrive /dev/sdb and inserted a Samsung Evo 840 as /dev/sda. From the original hard drive (/dev/sdb), I wiped the windows partition, but left all other partitions unchanged (in case I would ever want to recover the desktop to its original state). I replaced the wiped windows partition with a swap partition and an LVM partition.These are my hard drive partitions:

/dev/sda (Samsung Evo 840)

Number Start End Size File system Name Flags
1 1049kB 3146kB 2097kB primary bios_grub
2 3146kB 944MB 941MB ext4 boot
3 944MB 94.4GB 93.4GB host lvm
4 94.4GB 1000GB 906GB guests lvm


The partition /dev/sda3 has 2 logical volumes with filesystem ext4 that I mount to / and /home.The partition /dev/sda2 is mounted to /boot..When I install like this, Debian installs fine, however Grub2 is not installed correctly.Debian installs grub-pc which seems not able to boot the gpt partition. So I boot the Debian CD in rescue mode and execute:

mount /dev/sda2 /boot
aptitude purge grub-pc
aptitude -y install grub-efi

After rebooting, I come in the grub rescue shell, which says: error: no such device: 986f2176--4a4b-4222-83b9-8636a034b3c7.

When I then enter in the grub rescue shell:
set boot=(hd0,gpt2)
set prefix=(hd0,gpt2)/grub
insmod normal

Grub and Debian start up correctly.why can Grub not start up automatically correctly? Where does the UUID 986f2176--4a4b-4222-83b9-8636a034b3c7 come from? I have reinstalled Grub several times, I have reinstall Debian several times, I have even wiped all partitions from /dev/sda and recreated a new gpt table with parted and manually set the partitions in parted. Still on each reinstallation, Grub fails because it cannot find exactly the same UUID. Since this UUID is always the same, it must be stored somewhere, but it cannot be the partitions, I have wiped them and the partition table several times.

I did though a firmware update of the Samsung Evo 840 before reinstallation, could this be a cause?Also the problem is not in grub.cfg. Grub starts correctly if I enter the commands above in the grub rescue screen and the UUID value does not appear there.

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General :: Place Swap Partition On LVM Or On Standard Fdisk Partition

Aug 4, 2011

I wonder whether to place swap partition on LVM or on standard fdisk partition which will not be in LVM.What is better and more often used on production ?

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Ubuntu :: Swap Partition Access / Cant See That Partition

May 21, 2011

I've recently just installed ubuntu 11.04 but seem to have made a big mistake. During the install process I was asked to specify a location to be used for swap. Not really understanding what this meant I chose another partition on my drive with some free space but also a lot of my data. Needless to say I now cant see that partition. Is there anyway for me to access it? or to at least recover the information I need from there? its about a 200gig partition, and it used to be ntfs.

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General :: Change The Swap Partition To Another Partition?

Aug 1, 2010

I want to change the swap partition to another partition. Is there a gui that can make this process easier so I don't have to do things like manually editing files?

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Ubuntu :: No Swap Partition?

Feb 14, 2011

My motherboard supports up to 8GB DDR2. I currently have 4GB installed. If I maxed out my RAM, and installed 10.10 without a swap partition, I've heard this would increase speeds significantly. Would it? This particular rig runs multiple servers including an Asterisk PBX with FreePBX, XBMC, and Boxee. XBMC and Boxee do not run at the same time, only one at a time. Would it be safe to run with 8GB ram, and no swap partition? Running FreePBX/asterisk, XBMC, playing videos or ....., and every other background processes, free shows on average 50% free. Opinions?

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Ubuntu :: Swap Partition For New SSD?

Jun 17, 2011

I am getting a new SSD for my laptop and I have been researching the different tweaks for an SSD. I still have a question regarding the swap partition: is it better to not have one for an SSD? (I have 4GB of RAM...)

If I don't, how would I specify it during the installation process for 10.04?

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Ubuntu :: Restoring Encrypted 11.04 Partition?

May 24, 2011

had a lvm (non luks i suspect) home partition on my 11.04 install. I've since install opensue on the same laptop hoping that if i don't leave that partition alone during opensuse installation i would be able to mount and enter my key to access the data within...stupid me.... i formated my /boot and / partition, not my /home partition of 450gb. I'm now back on ubuntu 11.04 trying to get access to my data. i'v found the command "encryptfs-recover-private" but i only works on mounted partitons, i can't mount my encrypted partition because the system does not recongnize it. I've have to format it to mount it.

(bold is my encrypted partition)
Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 96256 83 Linux
Partition 1 does not end on cylinder boundary.


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Ubuntu :: Swap Partition Will Go In Extended One?

Jan 25, 2010

Can Ubuntu swap partition go in an Extended partition (a logical partition within the extended) while Ubuntu is on a Primary partition?

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Ubuntu :: What's The Best Way To Remove Swap Partition

Feb 6, 2010

I want to remove my swap partition. Probably one I would have to boot into a rescue cd and remove it, but aside from that is there any other consideration or commands that I need to be aware of?

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Ubuntu Servers :: The Swap Partition Is Not Being Used

Apr 19, 2010

I recently installed Ubuntu Server, the 8.04LTS release, on my dad's computer which, for the time being, has to dual-act as both a server and a desktop. Will be running solely as a server pretty soon, though. Anyway - since I was down on the budget and the project I put up the server for is still in a development phase and not worth to invest serious money in (at this stage), it has to run on a computer with the following hardware configuration (I left out the non-important parts):

Intel Celeron 2.2 Ghz
~500 MB of DDR 333MHz RAM

It has 80 or so GBs of disk space, so I went for the low-mem, high-disk scenario and created a swap partition of 1,5 GB. However, I can notice that is rarely even used! I have set the vm.swappiness parameter to 95 but my swap partition is still not being used, even when the memory usage goes up to 90%. I saw it being used once, but only when the needed memory size exceeded 500.

Does anybody know how to force Ubuntu Server to use the swap partition?

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Ubuntu :: Swap Partition Is Always At 0 Bytes

Jan 8, 2011

How do fix my Swap Partition? Last night I added unused space to the main Ubuntu partition. Now I noticed the Swap Partition is always at 0 bytes. I'm using a Sony Laptop, and have enclosed two screenshots. One of the Disk Utility and a system monitor.

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Ubuntu :: Add A Swap Partition To Lubuntu?

Jan 19, 2011

I have a live/persistent installs of Lubuntu 10.04 on a USB-HDD. It's on a 320 GB portable drive. I've partitioned it so that 80 GB is for the Lubuntu live install and the remaining 240 GB is another partition dedicated to storing stuff. So this USB-HDD is doing double duty. The thing is, I was paying so much attention to making the persistent install work without making a mess of the boot loader (I did that in the past; twice!) that I had overlooked the fact my live install does not have a swap sartition on it. I just assumed (incorrectly) that the swap partition on would just be part and parcel of the installation. Can anyone tell me of a way to add a swap partition to each of my live installs? Without losing any data or anything like that. It's probably not doing any harm not having a swap partition, but I'm assuming that my live install would be that much more efficient with it.

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Ubuntu Servers :: Swap Partition Does Not Get Used

Feb 15, 2011

After unsuccessfully trying to install Oracle Express I find that for some reason the swap partition on my server disk does not get used.

My setup: 10.10 server x64 on an intel server with two 500gb HDs in a mirror array

This is puzzling, because I definitely created a swap partition for this system and indeed if I look at /etc/fstab I actually have two swap partitions, one on /dev/mapper/[some long raid name]_ar05 and one on /dev/mapper/cryptswap1, but AFAIK this is normal with 10.10.

"swapon -a" fails with this message:

swapon: /dev/mapper/[raid name]_ar05: read swap header failed: Invalid argument
swapon: /dev/mapper/cryptswap1: stat failed: No such file or directory

there's always the option of using a file on the server's filesystem, but I want to see if this can be fixed. I only have remote access to server via SSH, which makes startup troubleshooting pretty impossible.

I have a local server at home also using 10.10 server 64-bit with an encrypted swap file running on a RAID array, but it does not have this problem.

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Ubuntu :: No Swap After Resizing Partition

Apr 1, 2011

I didn't like the fact that Ubuntu allocated like 5gigs of swap with its automatic partitioning / install. So I decided to shrink it with gparted now it doesn't show up when I boot I have to select swap on in gparted to use it.

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Ubuntu :: U11.04 Not Mounting My Swap Partition / Fix It?

May 11, 2011

Ubuntu has been complaining about swap not being ready during boot. The swap partition was showing up un-known in gparted. I booted off CD, reformatted it to swap. Error message gone but system monitor > resources shows my swap size to be 86GB (the exact size of my shared NTFS volume). gparted shows the swap partition as not 'swapped on'

I am running Ubuntu 11.04 along side Windows 7 (as well as my factory restore partition) and an NTFS shared partition.

My partition structure in order of location on disc. Screen shot below to help.
sda1-2 Windows 7
sda4, extended partition
--sda6 Ubuntu
--sda7 swap
--sda5 NTFS shared partition
sda3 Factory restore image

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Ubuntu :: Is Swap Partition Essential

Jun 11, 2011

If a computer has enough ram, say 2gb, is swap partition necessary? Will ubuntu run if swap partition is deleted?

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Ubuntu :: Can't Boot - Need To Mount Encrypted Partition?

May 2, 2010

Times like this Ubuntu makes me want to pull my hair out. When I enter my pass on the login screen, it brings up a "Could not update ICEauthority file" error and then goes to a black screen. I've tried to fix this problem for the past 2-3 hours (searching google, these forums, etc) and at this point, I just want the data off my drive so I can restart with a fresh install of Ubuntu. I used the "gsku nautilus" command to mount the disk from a Ubuntu Drive boot, but it's not letting me have access to the encrypted drive. Does anyone know of a work around for this?

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Ubuntu :: Tried To Upgrade - Home Partition Still Encrypted

Jul 10, 2010

I have a dual boot WinXP / Kubuntu system. Recently, I tried to upgrade from 9.10 to 10.04. I have my Kubuntu partition set up with separate partitions for / , /home , and swap. Naturally, I wanted to wipe the slate clean, so I formatted / and left /home alone before doing the install. However, my /home partition was encrypted with the standard crypto that you get when you install. I just deleted the way in by wiping my / partition. Now all of my files are on my drive but encrypted. I do have the unencrypted passphrase given to me when the hard drive was first encrypted, so I am sure there is some way to get my files, but I am unsure how to apply it.

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Ubuntu :: Accessing Encrypted Partition With Live CD?

Apr 25, 2011

I found this website [URL].., and am able to go all the way up to "ecryptfs-mount-private" command, but the response I get after entering my login passphrase is "mount: Operation not permitted". I am not sure why though I am guessing I have a permission issue.

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