Is “update-initramfs -u” needed after adding or removing a module with “modprobe”?

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Most instructions that I find online about adding or replacing kernel modules in Ubuntu only mention modprobe and rmmod. However, according my experience with e1000e, the modification is reverted after reboot unless I do update-initramfs -u afterwards. The man page of update-initramfs does not mention modules.



So, is it always necessary to run update-initramfs -u after replacing kernel modules if I want to have the modified kernel after reboot?




debian ubuntu kernel-modules




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  • Using the /etc/modprobe.d directory is also an option.
    – Raman Sailopal
    Feb 16 at 13:44














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0
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Most instructions that I find online about adding or replacing kernel modules in Ubuntu only mention modprobe and rmmod. However, according my experience with e1000e, the modification is reverted after reboot unless I do update-initramfs -u afterwards. The man page of update-initramfs does not mention modules.



So, is it always necessary to run update-initramfs -u after replacing kernel modules if I want to have the modified kernel after reboot?




debian ubuntu kernel-modules




share|improve this question






















  • Using the /etc/modprobe.d directory is also an option.
    – Raman Sailopal
    Feb 16 at 13:44












up vote
0
down vote

favorite









up vote
0
down vote

favorite











Most instructions that I find online about adding or replacing kernel modules in Ubuntu only mention modprobe and rmmod. However, according my experience with e1000e, the modification is reverted after reboot unless I do update-initramfs -u afterwards. The man page of update-initramfs does not mention modules.



So, is it always necessary to run update-initramfs -u after replacing kernel modules if I want to have the modified kernel after reboot?




debian ubuntu kernel-modules




share|improve this question














Most instructions that I find online about adding or replacing kernel modules in Ubuntu only mention modprobe and rmmod. However, according my experience with e1000e, the modification is reverted after reboot unless I do update-initramfs -u afterwards. The man page of update-initramfs does not mention modules.



So, is it always necessary to run update-initramfs -u after replacing kernel modules if I want to have the modified kernel after reboot?





debian ubuntu kernel-modules





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edited Feb 16 at 14:51

























asked Feb 16 at 13:03









Alexey

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  • Using the /etc/modprobe.d directory is also an option.
    – Raman Sailopal
    Feb 16 at 13:44
















  • Using the /etc/modprobe.d directory is also an option.
    – Raman Sailopal
    Feb 16 at 13:44















Using the /etc/modprobe.d directory is also an option.
– Raman Sailopal
Feb 16 at 13:44




Using the /etc/modprobe.d directory is also an option.
– Raman Sailopal
Feb 16 at 13:44










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I guess this is about some Linux distribution that is part of the Debian/Ubuntu family, as update-initramfs is part of Debian initramfs-tools.



If the module (and the command to load it) is included in initramfs, then update-initramfs -u is needed: if you don't do it, initramfs will still contain the old state (= old version of the module and the command to load it).



If you are uncertain whether or not the module is included in initramfs, use the lsinitramfs command to view the contents of your initramfs. For example:



$ lsinitramfs /boot/initrd.img-4.9.0-5-amd64 |less


However, running update-initramfs -u should generally never hurt, so if you are uncertain, you can just run it to err on the safe side.






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    I guess this is about some Linux distribution that is part of the Debian/Ubuntu family, as update-initramfs is part of Debian initramfs-tools.



    If the module (and the command to load it) is included in initramfs, then update-initramfs -u is needed: if you don't do it, initramfs will still contain the old state (= old version of the module and the command to load it).



    If you are uncertain whether or not the module is included in initramfs, use the lsinitramfs command to view the contents of your initramfs. For example:



    $ lsinitramfs /boot/initrd.img-4.9.0-5-amd64 |less


    However, running update-initramfs -u should generally never hurt, so if you are uncertain, you can just run it to err on the safe side.






    share|improve this answer
























      up vote
      1
      down vote













      I guess this is about some Linux distribution that is part of the Debian/Ubuntu family, as update-initramfs is part of Debian initramfs-tools.



      If the module (and the command to load it) is included in initramfs, then update-initramfs -u is needed: if you don't do it, initramfs will still contain the old state (= old version of the module and the command to load it).



      If you are uncertain whether or not the module is included in initramfs, use the lsinitramfs command to view the contents of your initramfs. For example:



      $ lsinitramfs /boot/initrd.img-4.9.0-5-amd64 |less


      However, running update-initramfs -u should generally never hurt, so if you are uncertain, you can just run it to err on the safe side.






      share|improve this answer






















        up vote
        1
        down vote










        up vote
        1
        down vote









        I guess this is about some Linux distribution that is part of the Debian/Ubuntu family, as update-initramfs is part of Debian initramfs-tools.



        If the module (and the command to load it) is included in initramfs, then update-initramfs -u is needed: if you don't do it, initramfs will still contain the old state (= old version of the module and the command to load it).



        If you are uncertain whether or not the module is included in initramfs, use the lsinitramfs command to view the contents of your initramfs. For example:



        $ lsinitramfs /boot/initrd.img-4.9.0-5-amd64 |less


        However, running update-initramfs -u should generally never hurt, so if you are uncertain, you can just run it to err on the safe side.






        share|improve this answer












        I guess this is about some Linux distribution that is part of the Debian/Ubuntu family, as update-initramfs is part of Debian initramfs-tools.



        If the module (and the command to load it) is included in initramfs, then update-initramfs -u is needed: if you don't do it, initramfs will still contain the old state (= old version of the module and the command to load it).



        If you are uncertain whether or not the module is included in initramfs, use the lsinitramfs command to view the contents of your initramfs. For example:



        $ lsinitramfs /boot/initrd.img-4.9.0-5-amd64 |less


        However, running update-initramfs -u should generally never hurt, so if you are uncertain, you can just run it to err on the safe side.







        share|improve this answer












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        share|improve this answer










        answered Feb 16 at 13:20









        telcoM

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