Re: Installing mdadm and C7 on new computer

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On 04/29/2022 07:30 AM, Joakim Dellrud wrote:
> Think he might have just missed the fact that you had EFI boot aswell. So then it would be:
> /boot md0
> /boot/EFI md1
> / md2 -> vg0 -> lvs
> Otherwise it was more a suggestion on using encryption for more then just the /home partition since there is always a risk with SWAP etc to have information that you do not want to be read.
> My current setup goes:
> /dev/mapper/vg0-root               /
> /dev/mapper/vg0-usr                /usr
> /dev/nvme0n1p2                      /boot       <- this would be a md device in your case
> /dev/nvme0n1p1                       /boot/efi <- this would be a md device in your case
> /dev/mapper/vg0-home             /home
> /dev/mapper/vg0-var                 /var
> /dev/mapper/vg0-tmp                 /tmp
> /dev/mapper/vg0-var_tmp          /var/tmp
> /dev/mapper/vg0-var_log            /var/log
> /dev/mapper/vg0-var_log_audit  /var/log/audit
> Note that we are most likely mixing data redundancy with data security a bit here. So as far as your plan to run a md device for each "partition" needed that is a sound and solid plan.
> When it comes to encryption the point is that you might want to have more then just /home protected. But this is very dependent on your threat model. If you have a laptop encryption of all partitions is suggested.
> Regards
> On 2022-04-24 20:54, H wrote:
>> On 04/23/2022 09:19 PM, H wrote:
>>> On 04/19/2022 09:57 AM, Roberto Ragusa wrote:
>>>> On 4/18/22 1:27 PM, H wrote:
>>>>> I have a new computer with 2 x 2TB SSDs where I wanted to install C7 and use mdadm for RAID1 configuration and encrypting the /home partition. On the net I found which I adopted slightly with respect to partition sizes, using RAID1 for /boot and /root as well and added the /home partition with RAID1 and chose to have /home encrypted.
>>>> It may be a good idea to also have / and swap encrypted, since user data can go there easily
>>>> (logs, locatedb, swapped mem).
>>>> I would do:
>>>> - /boot as a separate RAID1 (md1=sda1+sdb1)
>>>> - then another RAID1 (md2=sda2+sdb2) using all the remaining disk
>>>> - luks on top of md2, giving you luks-xxxxx
>>>> - LVM with a PV on luks-xxxxx
>>>> - VG and LVs for swap, / and /home (do not assign all the available space now, especially if using xfs as filesystem)
>>>> Not sure if you can do this setup through the installer, you have to try (in a VM maybe).
>>>> Regards.
>>> Thank you. I will have time to get back to this system tomorrow to try this.
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>> Roberto, what would the advantage(s) be with your setup, ie one RAID1 array for everything but /boot compared to what I had done, ie three RAID1 arrays for /boot/efi RAID1, /boot RAID1 and one LVM-RAID1 for / and /home? As a naive user it would seem to me that the setup I did would be more resilient if a disk fails, or?
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I am coming back to this topic after a long while. Again, I am installing CentOS 7 on a new machine. Using the graphical installer and following the suggestion above, I first created the /boot partition in RAID1 configuration, then /boot EFI in RAID1 configuration, after which I proceeded to create an LVM in RAID1 configuration for the remainder of the disks using the / partition.

If I understand the above correctly, I should then create /home and swap using this LVM (as well as possibly /var) but do not seem to be able to do so in the graphical installer.

Have I missed something? Or, do I need to do this differently following another path?

Thank you in advance.

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