Digimer wrote: > On 15/12/15 11:10 AM, m.roth at 5-cent.us wrote: >> Traiano Welcome wrote: >>> On Tue, Dec 15, 2015 at 6:36 PM, Digimer <lists at alteeve.ca> wrote: >>>> On 15/12/15 10:17 AM, Traiano Welcome wrote: >>>>> >>>>> Is it possible to upgrade from CentOS 6.7 to CentOS 7? >> <snip> >>>> Given how radically the OS changed, I would strongly advice against >>>> it. >>>> The move from sysvinit to systemd alone is enough to recommend against >>>> an upgrade. >>> >>> So it's not possible under any circumstances? >> >> Let me offer you one option: *IF* you have enough space on your >> filesystems, you could: >> mkdir /boot/old /old >> zsh >> zmodload zsh/files >> mv /boot/* /boot/old/ >> mv /usr /old/ >> mv /lib* /old/ >> sync >> sync >> And go into the installer. If you have a problem, you can go back.... > > How would the move from the old to new grub work, particularly in > reverse if needed? Was just reading Alice's post, and it struck me a safe way would be for the o/p to do a clean install on a different machine, then do the rsync's I mention. Several gotchas: don't forget to copy the old /etc/ssh/ssh_host* to the new /etc/ssh/, check the ifcfg-<NIC>, /etc/udev/rules.d/, and, if the new system is different hardware, rebuild the initrd *before* you reboot. You can also edit /boot/device/grub whatever the damn grub2 thing is, also before reboot. Or edit on the boot, get it up, and rerun grub2-install. mark