Keep kernel files in different directories

Is it possible to copy standard vmlinuz-3.10..... kernel file to another directory, rename it and load it during booting the system?

I'm on CentOS7 and I have a class task.
"Copy vmlinuz-... and initramfs-.... files from /boot to root directory, rename them, add menuentry "Spare kernel" and load it from this new copied kernel file".

I edited /etc/grub.d/40_custom file and added this menuentry. Screenshot1
Copied and renamed files (/kernel and /ramdisk)
Screenshot2
I have also made unexecutable /etc/grub.d/10_linux file (chmod 644).
As a result "Main kernel" - no problem, "Spare kernel" gives error
Screenshot3

I guess I have to set bootable root in correct way so I tried options 'set root=(hd0,msdos1)' and 'set root=(hd0,msdos2)' (/boot mounted on sda1, but system root ( / ) on sda2, I thought that (hd0,msdos2) will work but it doesn't).
Screenshot4

edited Dec 28 '18 at 8:18

Rui F Ribeiro

39.4k1479131

asked Dec 28 '18 at 7:49

Alex Kuchin

add a comment |

Is it possible to copy standard vmlinuz-3.10..... kernel file to another directory, rename it and load it during booting the system?

edited Dec 28 '18 at 8:18

Rui F Ribeiro

39.4k1479131

asked Dec 28 '18 at 7:49

Alex Kuchin

add a comment |

Is it possible to copy standard vmlinuz-3.10..... kernel file to another directory, rename it and load it during booting the system?

edited Dec 28 '18 at 8:18

Rui F Ribeiro

39.4k1479131

asked Dec 28 '18 at 7:49

Alex Kuchin

Is it possible to copy standard vmlinuz-3.10..... kernel file to another directory, rename it and load it during booting the system?

centos grub2

edited Dec 28 '18 at 8:18

Rui F Ribeiro

39.4k1479131

asked Dec 28 '18 at 7:49

Alex Kuchin

edited Dec 28 '18 at 8:18

Rui F Ribeiro

39.4k1479131

asked Dec 28 '18 at 7:49

Alex Kuchin

edited Dec 28 '18 at 8:18

Rui F Ribeiro

39.4k1479131

edited Dec 28 '18 at 8:18

Rui F Ribeiro

39.4k1479131

edited Dec 28 '18 at 8:18

Rui F Ribeiro

39.4k1479131

asked Dec 28 '18 at 7:49

Alex Kuchin

asked Dec 28 '18 at 7:49

Alex Kuchin

asked Dec 28 '18 at 7:49

Alex Kuchin

add a comment |

1 Answer
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Your root partition is on an LVM volume. When boot menu shows up, press "c" to enter the command prompt, then type "ls" command to list the partitions available on your system. You will see a partition like "(...centos-root)". Replace your "(hd0,msdos2)" in "set root=(hd0,msdos2)" with "(...centos-root)" you see, then try again.

(Remember to run grub2-mkconfig after modifying /etc/grub.d/40_custom.)

answered Jan 4 at 6:19

liuqx

211

New contributor

Thank you so much for your response. But my grub2's command prompt doesn't give me this partition option "(...centos-root)". Here is the link to my screenshots. Do you have any idea what I'm missing? Shall I create another partition or may be it is possible to solve as it is?
– Alex Kuchin
Jan 4 at 13:25

@AlexKuchin Run "insmod lvm" command before the "ls" command, and try again. If that works, add "insmod lvm" before "set root=..." in your menuentry.
– liuqx
Jan 6 at 2:50

Thanks a lot for your help. It works for me. Also had to delete piece of code between lines "set root='lvm/centos-root'" and "linux16 /kernel ..." (see screenshot above with my /etc/grub.d/40_custom file). Don't know exactly what are they need for, but they had some hints to "hd0,msdos*" partition and your advice didn't work while these lines existed.
– Alex Kuchin
13 hours ago

add a comment |

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answered Jan 4 at 6:19

liuqx

211

New contributor

Thank you so much for your response. But my grub2's command prompt doesn't give me this partition option "(...centos-root)". Here is the link to my screenshots. Do you have any idea what I'm missing? Shall I create another partition or may be it is possible to solve as it is?
– Alex Kuchin
Jan 4 at 13:25

@AlexKuchin Run "insmod lvm" command before the "ls" command, and try again. If that works, add "insmod lvm" before "set root=..." in your menuentry.
– liuqx
Jan 6 at 2:50

Thanks a lot for your help. It works for me. Also had to delete piece of code between lines "set root='lvm/centos-root'" and "linux16 /kernel ..." (see screenshot above with my /etc/grub.d/40_custom file). Don't know exactly what are they need for, but they had some hints to "hd0,msdos*" partition and your advice didn't work while these lines existed.
– Alex Kuchin
13 hours ago

add a comment |

answered Jan 4 at 6:19

liuqx

211

New contributor

Thank you so much for your response. But my grub2's command prompt doesn't give me this partition option "(...centos-root)". Here is the link to my screenshots. Do you have any idea what I'm missing? Shall I create another partition or may be it is possible to solve as it is?
– Alex Kuchin
Jan 4 at 13:25

@AlexKuchin Run "insmod lvm" command before the "ls" command, and try again. If that works, add "insmod lvm" before "set root=..." in your menuentry.
– liuqx
Jan 6 at 2:50

Thanks a lot for your help. It works for me. Also had to delete piece of code between lines "set root='lvm/centos-root'" and "linux16 /kernel ..." (see screenshot above with my /etc/grub.d/40_custom file). Don't know exactly what are they need for, but they had some hints to "hd0,msdos*" partition and your advice didn't work while these lines existed.
– Alex Kuchin
13 hours ago

add a comment |

answered Jan 4 at 6:19

liuqx

211

New contributor

answered Jan 4 at 6:19

liuqx

211

New contributor

answered Jan 4 at 6:19

liuqx

211

New contributor

answered Jan 4 at 6:19

liuqx

211

answered Jan 4 at 6:19

liuqx

211

New contributor

liuqx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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Thank you so much for your response. But my grub2's command prompt doesn't give me this partition option "(...centos-root)". Here is the link to my screenshots. Do you have any idea what I'm missing? Shall I create another partition or may be it is possible to solve as it is?
– Alex Kuchin
Jan 4 at 13:25

@AlexKuchin Run "insmod lvm" command before the "ls" command, and try again. If that works, add "insmod lvm" before "set root=..." in your menuentry.
– liuqx
Jan 6 at 2:50

Thanks a lot for your help. It works for me. Also had to delete piece of code between lines "set root='lvm/centos-root'" and "linux16 /kernel ..." (see screenshot above with my /etc/grub.d/40_custom file). Don't know exactly what are they need for, but they had some hints to "hd0,msdos*" partition and your advice didn't work while these lines existed.
– Alex Kuchin
13 hours ago

add a comment |

Thank you so much for your response. But my grub2's command prompt doesn't give me this partition option "(...centos-root)". Here is the link to my screenshots. Do you have any idea what I'm missing? Shall I create another partition or may be it is possible to solve as it is?
– Alex Kuchin
Jan 4 at 13:25

@AlexKuchin Run "insmod lvm" command before the "ls" command, and try again. If that works, add "insmod lvm" before "set root=..." in your menuentry.
– liuqx
Jan 6 at 2:50

Thanks a lot for your help. It works for me. Also had to delete piece of code between lines "set root='lvm/centos-root'" and "linux16 /kernel ..." (see screenshot above with my /etc/grub.d/40_custom file). Don't know exactly what are they need for, but they had some hints to "hd0,msdos*" partition and your advice didn't work while these lines existed.
– Alex Kuchin
13 hours ago

Thank you so much for your response. But my grub2's command prompt doesn't give me this partition option "(...centos-root)". Here is the link to my screenshots. Do you have any idea what I'm missing? Shall I create another partition or may be it is possible to solve as it is?
– Alex Kuchin
Jan 4 at 13:25

@AlexKuchin Run "insmod lvm" command before the "ls" command, and try again. If that works, add "insmod lvm" before "set root=..." in your menuentry.
– liuqx
Jan 6 at 2:50

Thanks a lot for your help. It works for me. Also had to delete piece of code between lines "set root='lvm/centos-root'" and "linux16 /kernel ..." (see screenshot above with my /etc/grub.d/40_custom file). Don't know exactly what are they need for, but they had some hints to "hd0,msdos*" partition and your advice didn't work while these lines existed.
– Alex Kuchin
13 hours ago

add a comment |

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