How can I replace root / filesystem with another filesystem?Given vmlinuz and initrd.gz, how do I find out,...
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How can I replace root / filesystem with another filesystem?
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When the Linux kernel starts up, it uses initrd as the root / filesystem, then replaces that with a filesystem partition in fstab.
Based on a test in an early init script, I want to replace that root / filesystem with another filesystem partition. How to do that?
mount init initramfs initrd root-filesystem
asked Aug 18 '14 at 17:22
SeperoSepero
6093 gold badges14 silver badges26 bronze badges
bumped to the homepage by Community♦ 16 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
|
show 1 more comment
When the Linux kernel starts up, it uses initrd as the root / filesystem, then replaces that with a filesystem partition in fstab.
Based on a test in an early init script, I want to replace that root / filesystem with another filesystem partition. How to do that?
mount init initramfs initrd root-filesystem
asked Aug 18 '14 at 17:22
SeperoSepero
6093 gold badges14 silver badges26 bronze badges
bumped to the homepage by Community♦ 16 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
Are you asking to create a dual boot?
– ryekayo
Aug 18 '14 at 17:24
@ryekayo no, not dual boot. Dual boot is a modification of boot loader. I'm not modifying the boot loader.
– Sepero
Aug 18 '14 at 17:30
Do you mean that you want to go initrd → root #1 → root #2? This isn't possible. But you can modify the content of the initrd and go initrd → root #2. (Are you sure it's an initrd and not an initramfs? Most distributions have switched to initramfs, even though the image file may still be calledinitrd; the principle is the same but the mechanics are a little different.) What tests do you need to make to determine the location of the root filesystem?
– Gilles
Aug 18 '14 at 21:36
Here's an alternative in case you can't do it inside initrd: list all your possible roots as separate boot options in grub.conf, then in an init script usegrub-reboot nto choose one of them if the desired root isn't currently mounted. superuser.com/a/290458/264506 has some details.
– Mark Plotnick
Aug 19 '14 at 0:16
Thanks for the suggestion Mark. Unfortunately the machine is Arm architecture and doesn't use grub.
– Sepero
Aug 24 '14 at 15:35
|
show 1 more comment
When the Linux kernel starts up, it uses initrd as the root / filesystem, then replaces that with a filesystem partition in fstab.
Based on a test in an early init script, I want to replace that root / filesystem with another filesystem partition. How to do that?
mount init initramfs initrd root-filesystem
asked Aug 18 '14 at 17:22
SeperoSepero
6093 gold badges14 silver badges26 bronze badges
When the Linux kernel starts up, it uses initrd as the root / filesystem, then replaces that with a filesystem partition in fstab.
Based on a test in an early init script, I want to replace that root / filesystem with another filesystem partition. How to do that?
mount init initramfs initrd root-filesystem
mount init initramfs initrd root-filesystem
asked Aug 18 '14 at 17:22
SeperoSepero
6093 gold badges14 silver badges26 bronze badges
asked Aug 18 '14 at 17:22
SeperoSepero
6093 gold badges14 silver badges26 bronze badges
asked Aug 18 '14 at 17:22
SeperoSepero
6093 gold badges14 silver badges26 bronze badges
asked Aug 18 '14 at 17:22
SeperoSepero
6093 gold badges14 silver badges26 bronze badges
asked Aug 18 '14 at 17:22
SeperoSepero
6093 gold badges14 silver badges26 bronze badges
6093 gold badges14 silver badges26 bronze badges
bumped to the homepage by Community♦ 16 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
bumped to the homepage by Community♦ 16 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
bumped to the homepage by Community♦ 16 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
Are you asking to create a dual boot?
– ryekayo
Aug 18 '14 at 17:24
@ryekayo no, not dual boot. Dual boot is a modification of boot loader. I'm not modifying the boot loader.
– Sepero
Aug 18 '14 at 17:30
Do you mean that you want to go initrd → root #1 → root #2? This isn't possible. But you can modify the content of the initrd and go initrd → root #2. (Are you sure it's an initrd and not an initramfs? Most distributions have switched to initramfs, even though the image file may still be calledinitrd; the principle is the same but the mechanics are a little different.) What tests do you need to make to determine the location of the root filesystem?
– Gilles
Aug 18 '14 at 21:36
Here's an alternative in case you can't do it inside initrd: list all your possible roots as separate boot options in grub.conf, then in an init script usegrub-reboot nto choose one of them if the desired root isn't currently mounted. superuser.com/a/290458/264506 has some details.
– Mark Plotnick
Aug 19 '14 at 0:16
Thanks for the suggestion Mark. Unfortunately the machine is Arm architecture and doesn't use grub.
– Sepero
Aug 24 '14 at 15:35
|
show 1 more comment
Are you asking to create a dual boot?
– ryekayo
Aug 18 '14 at 17:24
@ryekayo no, not dual boot. Dual boot is a modification of boot loader. I'm not modifying the boot loader.
– Sepero
Aug 18 '14 at 17:30
Do you mean that you want to go initrd → root #1 → root #2? This isn't possible. But you can modify the content of the initrd and go initrd → root #2. (Are you sure it's an initrd and not an initramfs? Most distributions have switched to initramfs, even though the image file may still be calledinitrd; the principle is the same but the mechanics are a little different.) What tests do you need to make to determine the location of the root filesystem?
– Gilles
Aug 18 '14 at 21:36
Here's an alternative in case you can't do it inside initrd: list all your possible roots as separate boot options in grub.conf, then in an init script usegrub-reboot nto choose one of them if the desired root isn't currently mounted. superuser.com/a/290458/264506 has some details.
– Mark Plotnick
Aug 19 '14 at 0:16
Thanks for the suggestion Mark. Unfortunately the machine is Arm architecture and doesn't use grub.
– Sepero
Aug 24 '14 at 15:35
Are you asking to create a dual boot?
– ryekayo
Aug 18 '14 at 17:24
Are you asking to create a dual boot?
– ryekayo
Aug 18 '14 at 17:24
@ryekayo no, not dual boot. Dual boot is a modification of boot loader. I'm not modifying the boot loader.
– Sepero
Aug 18 '14 at 17:30
@ryekayo no, not dual boot. Dual boot is a modification of boot loader. I'm not modifying the boot loader.
– Sepero
Aug 18 '14 at 17:30
Do you mean that you want to go initrd → root #1 → root #2? This isn't possible. But you can modify the content of the initrd and go initrd → root #2. (Are you sure it's an initrd and not an initramfs? Most distributions have switched to initramfs, even though the image file may still be called
initrd; the principle is the same but the mechanics are a little different.) What tests do you need to make to determine the location of the root filesystem?– Gilles
Aug 18 '14 at 21:36
Do you mean that you want to go initrd → root #1 → root #2? This isn't possible. But you can modify the content of the initrd and go initrd → root #2. (Are you sure it's an initrd and not an initramfs? Most distributions have switched to initramfs, even though the image file may still be called
initrd; the principle is the same but the mechanics are a little different.) What tests do you need to make to determine the location of the root filesystem?– Gilles
Aug 18 '14 at 21:36
Here's an alternative in case you can't do it inside initrd: list all your possible roots as separate boot options in grub.conf, then in an init script use
grub-reboot n to choose one of them if the desired root isn't currently mounted. superuser.com/a/290458/264506 has some details.– Mark Plotnick
Aug 19 '14 at 0:16
Here's an alternative in case you can't do it inside initrd: list all your possible roots as separate boot options in grub.conf, then in an init script use
grub-reboot n to choose one of them if the desired root isn't currently mounted. superuser.com/a/290458/264506 has some details.– Mark Plotnick
Aug 19 '14 at 0:16
Thanks for the suggestion Mark. Unfortunately the machine is Arm architecture and doesn't use grub.
– Sepero
Aug 24 '14 at 15:35
Thanks for the suggestion Mark. Unfortunately the machine is Arm architecture and doesn't use grub.
– Sepero
Aug 24 '14 at 15:35
|
show 1 more comment
1 Answer
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I know this is an old thread, but still came up in Google.
if you stumble on this, look at pivot_root
https://linux.die.net/man/8/pivot_root
answered Apr 12 '18 at 21:43
Paul MPaul M
2012 silver badges5 bronze badges
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I know this is an old thread, but still came up in Google.
if you stumble on this, look at pivot_root
https://linux.die.net/man/8/pivot_root
answered Apr 12 '18 at 21:43
Paul MPaul M
2012 silver badges5 bronze badges
add a comment |
I know this is an old thread, but still came up in Google.
if you stumble on this, look at pivot_root
https://linux.die.net/man/8/pivot_root
answered Apr 12 '18 at 21:43
Paul MPaul M
2012 silver badges5 bronze badges
add a comment |
I know this is an old thread, but still came up in Google.
if you stumble on this, look at pivot_root
https://linux.die.net/man/8/pivot_root
answered Apr 12 '18 at 21:43
Paul MPaul M
2012 silver badges5 bronze badges
I know this is an old thread, but still came up in Google.
if you stumble on this, look at pivot_root
https://linux.die.net/man/8/pivot_root
answered Apr 12 '18 at 21:43
Paul MPaul M
2012 silver badges5 bronze badges
answered Apr 12 '18 at 21:43
Paul MPaul M
2012 silver badges5 bronze badges
answered Apr 12 '18 at 21:43
Paul MPaul M
2012 silver badges5 bronze badges
answered Apr 12 '18 at 21:43
Paul MPaul M
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Are you asking to create a dual boot?
– ryekayo
Aug 18 '14 at 17:24
@ryekayo no, not dual boot. Dual boot is a modification of boot loader. I'm not modifying the boot loader.
– Sepero
Aug 18 '14 at 17:30
Do you mean that you want to go initrd → root #1 → root #2? This isn't possible. But you can modify the content of the initrd and go initrd → root #2. (Are you sure it's an initrd and not an initramfs? Most distributions have switched to initramfs, even though the image file may still be called
initrd; the principle is the same but the mechanics are a little different.) What tests do you need to make to determine the location of the root filesystem?– Gilles
Aug 18 '14 at 21:36
Here's an alternative in case you can't do it inside initrd: list all your possible roots as separate boot options in grub.conf, then in an init script use
grub-reboot nto choose one of them if the desired root isn't currently mounted. superuser.com/a/290458/264506 has some details.– Mark Plotnick
Aug 19 '14 at 0:16
Thanks for the suggestion Mark. Unfortunately the machine is Arm architecture and doesn't use grub.
– Sepero
Aug 24 '14 at 15:35