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We have several linux (Centos) live usb drives and I was wondering whether it was possible to just mount and update them from a linux desktop (running from a HDD) instead of booting and running yum on each one.

  • A chroot into the mount point might do the trick. – thrig Apr 12 '16 at 15:52
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After you have mounted them somewhere (/media/usb) do a chroot /media/usb /bin/bash to chroot into the USB system. Do whatever you need to do and exit afterwards. Replace /bin/bash if you prefer another shell or bash isn't available.

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