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Linux refusing mapped image file created with dd as swap device
Is possible execute crypttab config without rebooting making the encrypted device mapped and available?swap partition vs file for performance?how can I boot linux from a software raid 1 arraylinux + swap definitionLinux: Where to put the swap filersnapshot frequently ext3-fs error: “ext3_lookup: deleted inode referenced:”Linux swap, linear write/readBest way to disable swap in LinuxUnable to execute linux commands after fsck“Operation not permitted” on files over 2GB on ext4 filesystemRAID0 mount fault: how to restore/recover data (disks do not seems faulty, superblock issue)
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty height:90px;width:728px;box-sizing:border-box;
Getting the error "WRITE ERROR ON SWAP DEVICE" on boot but all works fine when I change the line:
truncate -s $swapsize $flPtDev
by
cp /swap.img $flPtDev
The complete script is the following:
cd /home/myuser/
mkdir ./.myfolder
cd ./.myfolder
swapsize='4G'
curdir=$(pwd)
flNmDev="myfile.img"
flPtDev="$curdir/$flNmDev"
flNmKey="mykeyfile"
flPtKey="$curdir/$flNmKey"
flNmMnt="myDesiredMappedDeviceName"
flPtMnt="$curdir/$flNmMnt"
truncate -s $swapsize $flPtDev # ** THE OFFENDING LINE **
chmod 0600 $flPtDev
chown root $flPtDev
dd if=/dev/urandom of=$flPtKey bs=4096 count=1 conv=notrunc,noerror
sudo chmod 0600 $flPtKey
chown root $flPtKey
cat << EOF > /etc/crypttab
# <target name> <source device> <key file> <options>
$flNmMnt $flPtDev $flPtKey swap,offset=1024,cipher=aes-xts-plain64
EOF
cryptdisks_start $flNmMnt
rpl "/swap.img none swap sw 0 0" "#/swap.img none swap sw 0 0" /etc/fstab
echo "/dev/mapper/$flNmMnt none swap sw 0 0" >> /etc/fstab
linux filesystems swap encrypting-file-system
asked May 9 at 21:54
MarkMark
114
add a comment |
Getting the error "WRITE ERROR ON SWAP DEVICE" on boot but all works fine when I change the line:
truncate -s $swapsize $flPtDev
by
cp /swap.img $flPtDev
The complete script is the following:
cd /home/myuser/
mkdir ./.myfolder
cd ./.myfolder
swapsize='4G'
curdir=$(pwd)
flNmDev="myfile.img"
flPtDev="$curdir/$flNmDev"
flNmKey="mykeyfile"
flPtKey="$curdir/$flNmKey"
flNmMnt="myDesiredMappedDeviceName"
flPtMnt="$curdir/$flNmMnt"
truncate -s $swapsize $flPtDev # ** THE OFFENDING LINE **
chmod 0600 $flPtDev
chown root $flPtDev
dd if=/dev/urandom of=$flPtKey bs=4096 count=1 conv=notrunc,noerror
sudo chmod 0600 $flPtKey
chown root $flPtKey
cat << EOF > /etc/crypttab
# <target name> <source device> <key file> <options>
$flNmMnt $flPtDev $flPtKey swap,offset=1024,cipher=aes-xts-plain64
EOF
cryptdisks_start $flNmMnt
rpl "/swap.img none swap sw 0 0" "#/swap.img none swap sw 0 0" /etc/fstab
echo "/dev/mapper/$flNmMnt none swap sw 0 0" >> /etc/fstab
linux filesystems swap encrypting-file-system
asked May 9 at 21:54
MarkMark
114
I dont see where you're actually creating a swap area. You're just creating a file. mkswap man page.
– yoonix
May 9 at 22:58
1
@yoonix Thanks for the help too.
– Mark
May 10 at 17:08
add a comment |
Getting the error "WRITE ERROR ON SWAP DEVICE" on boot but all works fine when I change the line:
truncate -s $swapsize $flPtDev
by
cp /swap.img $flPtDev
The complete script is the following:
cd /home/myuser/
mkdir ./.myfolder
cd ./.myfolder
swapsize='4G'
curdir=$(pwd)
flNmDev="myfile.img"
flPtDev="$curdir/$flNmDev"
flNmKey="mykeyfile"
flPtKey="$curdir/$flNmKey"
flNmMnt="myDesiredMappedDeviceName"
flPtMnt="$curdir/$flNmMnt"
truncate -s $swapsize $flPtDev # ** THE OFFENDING LINE **
chmod 0600 $flPtDev
chown root $flPtDev
dd if=/dev/urandom of=$flPtKey bs=4096 count=1 conv=notrunc,noerror
sudo chmod 0600 $flPtKey
chown root $flPtKey
cat << EOF > /etc/crypttab
# <target name> <source device> <key file> <options>
$flNmMnt $flPtDev $flPtKey swap,offset=1024,cipher=aes-xts-plain64
EOF
cryptdisks_start $flNmMnt
rpl "/swap.img none swap sw 0 0" "#/swap.img none swap sw 0 0" /etc/fstab
echo "/dev/mapper/$flNmMnt none swap sw 0 0" >> /etc/fstab
linux filesystems swap encrypting-file-system
asked May 9 at 21:54
MarkMark
114
Getting the error "WRITE ERROR ON SWAP DEVICE" on boot but all works fine when I change the line:
truncate -s $swapsize $flPtDev
by
cp /swap.img $flPtDev
The complete script is the following:
cd /home/myuser/
mkdir ./.myfolder
cd ./.myfolder
swapsize='4G'
curdir=$(pwd)
flNmDev="myfile.img"
flPtDev="$curdir/$flNmDev"
flNmKey="mykeyfile"
flPtKey="$curdir/$flNmKey"
flNmMnt="myDesiredMappedDeviceName"
flPtMnt="$curdir/$flNmMnt"
truncate -s $swapsize $flPtDev # ** THE OFFENDING LINE **
chmod 0600 $flPtDev
chown root $flPtDev
dd if=/dev/urandom of=$flPtKey bs=4096 count=1 conv=notrunc,noerror
sudo chmod 0600 $flPtKey
chown root $flPtKey
cat << EOF > /etc/crypttab
# <target name> <source device> <key file> <options>
$flNmMnt $flPtDev $flPtKey swap,offset=1024,cipher=aes-xts-plain64
EOF
cryptdisks_start $flNmMnt
rpl "/swap.img none swap sw 0 0" "#/swap.img none swap sw 0 0" /etc/fstab
echo "/dev/mapper/$flNmMnt none swap sw 0 0" >> /etc/fstab
linux filesystems swap encrypting-file-system
linux filesystems swap encrypting-file-system
asked May 9 at 21:54
MarkMark
114
asked May 9 at 21:54
MarkMark
114
edited May 14 at 20:00
Mark
asked May 9 at 21:54
MarkMark
114
asked May 9 at 21:54
MarkMark
114
asked May 9 at 21:54
MarkMark
114
114
I dont see where you're actually creating a swap area. You're just creating a file. mkswap man page.
– yoonix
May 9 at 22:58
1
@yoonix Thanks for the help too.
– Mark
May 10 at 17:08
add a comment |
I dont see where you're actually creating a swap area. You're just creating a file. mkswap man page.
– yoonix
May 9 at 22:58
1
@yoonix Thanks for the help too.
– Mark
May 10 at 17:08
I dont see where you're actually creating a swap area. You're just creating a file. mkswap man page.
– yoonix
May 9 at 22:58
I dont see where you're actually creating a swap area. You're just creating a file. mkswap man page.
– yoonix
May 9 at 22:58
1
1
@yoonix Thanks for the help too.
– Mark
May 10 at 17:08
@yoonix Thanks for the help too.
– Mark
May 10 at 17:08
add a comment |
1 Answer
1
active
oldest
votes
Swap files cannot be sparse files. They must be fully allocated. If the system tries to write to a part of a swap file that wasn't allocated, the write error occurs.
Copying the swap file fixes the problem by fully allocating the destination file.
You can fix the original problem by creating a fully allocated swap file to begin with. There are a few ways to do that, but the fastest and easiest to integrate into your process is probably going to be:
fallocate -l $swapsize $flPtDev
answered May 10 at 0:00
Michael Hampton♦Michael Hampton
178k27322655
1
Thanks for the help and as @yoonix warned I forgot put the mkswap command on this question too.
– Mark
May 10 at 17:08
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Swap files cannot be sparse files. They must be fully allocated. If the system tries to write to a part of a swap file that wasn't allocated, the write error occurs.
Copying the swap file fixes the problem by fully allocating the destination file.
You can fix the original problem by creating a fully allocated swap file to begin with. There are a few ways to do that, but the fastest and easiest to integrate into your process is probably going to be:
fallocate -l $swapsize $flPtDev
answered May 10 at 0:00
Michael Hampton♦Michael Hampton
178k27322655
1
Thanks for the help and as @yoonix warned I forgot put the mkswap command on this question too.
– Mark
May 10 at 17:08
add a comment |
Swap files cannot be sparse files. They must be fully allocated. If the system tries to write to a part of a swap file that wasn't allocated, the write error occurs.
Copying the swap file fixes the problem by fully allocating the destination file.
You can fix the original problem by creating a fully allocated swap file to begin with. There are a few ways to do that, but the fastest and easiest to integrate into your process is probably going to be:
fallocate -l $swapsize $flPtDev
answered May 10 at 0:00
Michael Hampton♦Michael Hampton
178k27322655
1
Thanks for the help and as @yoonix warned I forgot put the mkswap command on this question too.
– Mark
May 10 at 17:08
add a comment |
Swap files cannot be sparse files. They must be fully allocated. If the system tries to write to a part of a swap file that wasn't allocated, the write error occurs.
Copying the swap file fixes the problem by fully allocating the destination file.
You can fix the original problem by creating a fully allocated swap file to begin with. There are a few ways to do that, but the fastest and easiest to integrate into your process is probably going to be:
fallocate -l $swapsize $flPtDev
answered May 10 at 0:00
Michael Hampton♦Michael Hampton
178k27322655
Swap files cannot be sparse files. They must be fully allocated. If the system tries to write to a part of a swap file that wasn't allocated, the write error occurs.
Copying the swap file fixes the problem by fully allocating the destination file.
You can fix the original problem by creating a fully allocated swap file to begin with. There are a few ways to do that, but the fastest and easiest to integrate into your process is probably going to be:
fallocate -l $swapsize $flPtDev
answered May 10 at 0:00
Michael Hampton♦Michael Hampton
178k27322655
answered May 10 at 0:00
Michael Hampton♦Michael Hampton
178k27322655
answered May 10 at 0:00
Michael Hampton♦Michael Hampton
178k27322655
answered May 10 at 0:00
Michael Hampton♦Michael Hampton
178k27322655
178k27322655
1
Thanks for the help and as @yoonix warned I forgot put the mkswap command on this question too.
– Mark
May 10 at 17:08
add a comment |
1
Thanks for the help and as @yoonix warned I forgot put the mkswap command on this question too.
– Mark
May 10 at 17:08
1
1
Thanks for the help and as @yoonix warned I forgot put the mkswap command on this question too.
– Mark
May 10 at 17:08
Thanks for the help and as @yoonix warned I forgot put the mkswap command on this question too.
– Mark
May 10 at 17:08
add a comment |
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I dont see where you're actually creating a swap area. You're just creating a file. mkswap man page.
– yoonix
May 9 at 22:58
1
@yoonix Thanks for the help too.
– Mark
May 10 at 17:08