| 1 |
2013/12/3 Canek Peláez Valdés <caneko@×××××.com>: |
| 2 |
> On Tue, Dec 3, 2013 at 12:06 AM, Canek Peláez Valdés <caneko@×××××.com> wrote: |
| 3 |
>> On Mon, Dec 2, 2013 at 10:34 PM, Jc García <jyo.garcia@×××××.com> wrote: |
| 4 |
>>> 2013/12/2 William Kenworthy <billk@×××××××××.au> |
| 5 |
>>>> |
| 6 |
>>>> You are looking far too deep .... |
| 7 |
>>>> |
| 8 |
>>>> |
| 9 |
>>>> just rsync -avP to /newusr |
| 10 |
>>> |
| 11 |
>>> +1 |
| 12 |
>>> I have done this more or less the same way |
| 13 |
>>>> |
| 14 |
>>>> reboot to livecd |
| 15 |
>>>> |
| 16 |
>>>> rsync again with --delete to update ... takes a only few seconds this |
| 17 |
>>>> time - minimal downtime :) |
| 18 |
>>>> mv /usr /oldusr |
| 19 |
>>>> mv /newusr /usr |
| 20 |
>>>> reboot |
| 21 |
>>> |
| 22 |
>>> |
| 23 |
>>> Let's make this thread more interesting, would it be possible to do |
| 24 |
>>> this without a reboot? ie: going single user mode, kill anything that |
| 25 |
>>> might still be running from usr, umount /usr, mount it to /mnt, rsync |
| 26 |
>>> -avP to usr, going again into runlevel 3 or 5. |
| 27 |
>>> Obviously not possible if running systemd. |
| 28 |
>> |
| 29 |
>> I'm not so sure it's not possible. Perhaps it's even easier. |
| 30 |
> |
| 31 |
> So, yeah, I think it's easier with systemd. You just: |
| 32 |
> |
| 33 |
> 1. systemctl isolate emergency.target |
| 34 |
> 2. log in again (all the normal gettys are killed with the above command) |
| 35 |
> 3. rsync -PvasHA /usr/ /newusr/ |
| 36 |
> 4. mv /usr /oldusr # mv is on /bin, so no problems here |
| 37 |
> 5. mv /newusr /usr |
| 38 |
> 6. rm -rf /oldusr (to make sure nothing uses it anymore) |
| 39 |
> 7. systemctl isolate multi-user.target |
| 40 |
> 8. You have your system again. |
| 41 |
> |
| 42 |
Nice, I thought systemd residing within /usr would be the limitation, |
| 43 |
i haven't used systemd very much , so i don't really know it's options, |
| 44 |
but later after thinking about it, i thought that using the initramfs |
| 45 |
would be a way to go, |
| 46 |
but as i understand here systemd already has an option to make use of it. |
| 47 |
|
| 48 |
> I did this on a minimal QEMU virtual machine. However I think it |
| 49 |
> should work with even the most complex setups, as long as your |
| 50 |
> initramfs has the necessary tools, which is really easy with dracut. |
| 51 |
> |
| 52 |
> Regards. |
| 53 |
> -- |
| 54 |
> Canek Peláez Valdés |
| 55 |
> Posgrado en Ciencia e Ingeniería de la Computación |
| 56 |
> Universidad Nacional Autónoma de México |
| 57 |
> |
Archives