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Server

Debian automated install preseed auto partitioning seemingly ignored

Bil5

11/11/22, 4:26 AM

I'm playing with Debian preseed files trying to auto-partitioning a single disk. The final disk state I'm trying to reach is the following :

boot              Primary Partition 1   ext3    [256MB]   primary   /boot (/dev/sda1)
rootfs            Primary Partition 2   f2fs    [16GB]    primary   / (/dev/sda2)
swap              swap                  swap    [4GB]     swap      (/dev/sda3)
extended          Extended partition    ext4    [42GB]    primary   (/dev/sda4)
 |- application                         ext4    [4GB]     logical   /application (/dev/sda5)
 |- database                            btrfs   [4GB]     logical   /database (/dev/sda6)
 |- medias                              btrfs   [32GB]    logical   /medias (/dev/sda7)

For that purpose, I created the following section in the preseed file :

d-i partman-auto/expert_recipe string                     \
  boot-root ::                                            \
          256 256 256 ext3                                \
                  $primary{ } $bootable{ }                \
                  method{ format } format{ }              \
                  use_filesystem{ } filesystem{ ext3 }    \
                  label{ boot }                           \
                  mountpoint{ /boot }                     \
          .                                               \
          4096 4096 200% linux-swap                       \
                  method{ swap } format{ }                \
                  label{ swap_part }                      \
                  mountpoint{ /swap }                     \
          .                                               \
          16384 16384 16384 f2fs                          \
                  $primary{ }                             \
                  method{ format } format{ }              \
                  use_filesystem{ } filesystem{ f2fs }    \
                  label{ rootfs }                         \
                  mountpoint{ / }                         \
          .                                               \
          42000 42000 -1 ext4                             \
                  $primary{ }                             \
                  method{ format } format{ }              \
                  use_filesystem{ } filesystem{ ext4 }    \
                  mountpoint{ / }                         \
          .                                               \
          4096 4096 4096 ext4                             \
                  method{ format } format{ }              \
                  use_filesystem{ } filesystem{ ext4 }    \
                  label{ application }                    \
                  mountpoint{ /application }              \
          .                                               \
          4096 4096 4096 btrfs                            \
                  method{ format } format{ }              \
                  use_filesystem{ } filesystem{ btrfs }   \
                  label{ database }                       \
                  mountpoint{ /database }                 \
          .                                               \
          32768 32768 32768 btrfs                         \
                  method{ format } format{ }              \
                  use_filesystem{ } filesystem{ btrfs }   \
                  label{ medias }                         \
                  mountpoint{ /medias }                   \

It doesn't work as expected and create the following :

user@debian:~$ lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda      8:0    0   80G  0 disk
|--sda1  8:1    0   79G  0 part /
|--sda2  8:2    0    1K  0 part
|--sda5  8:5    0  975M  0 part [SWAP]
sr0     11:0    1 1024M  0 rom

It's pretty confusing since it has nothing expected based on the preseed instructions. The preseed is being downloaded on the fly and the full content can be found here :

preseed.cfg

Thanks for your insights.

190

0 + 10

partition

debian

automated-install

preseed

Gerard H. Pille

11/12/22, 12:28 AM

$primary missing on rootfs?

Bil5

11/12/22, 2:01 AM

@GerardH.Pille Great catch, I added $primary and changed f2fs to ext4 to get more chance to have it working but there's actually no difference, it seems it's not even considered, which is weird since if I remove the rootfs it complains telling there must be a root file system.

Gerard H. Pille

11/12/22, 2:32 AM

mountpoint{ / } duplicate?

Bil5

11/12/22, 2:45 AM

I read somewhere that it was the way to go to have an extended partition since there is no other option to specify it, but for testing purposes, I completely removed this partition and it's unfortunately still the same. The current version of my preseed file is here : https://pastebin.com/xhV643Jd the relevant partitioning part is here : https://pastebin.com/3sf1fpXK

Gerard H. Pille

11/12/22, 3:02 AM

"Due to limitation of the algorithms in partman-auto, there must be at least one partition with high maximal size ", you don't have a 1000000000 partition.

Bil5

11/12/22, 3:29 AM

Isn't the `-1` part equivalent to "max" ? I just tried with `32000 32768 1000000000 btrfs` for the last partition but it resulted in the same, I guess there must be another subtility somewhere, the documentation is quite poor unfortunately

Gerard H. Pille

11/12/22, 4:34 AM

-1 is max indeed, but read 5. Limitations. Doesn't partman (or whatever is running this) leave a log behind?

Gerard H. Pille

11/12/22, 4:53 AM

There's no choose_recipe boot-root (beet-root?)

Bil5

11/12/22, 6:46 AM

The only recipes I encountered so far are `boot-root` and `root`, it may exist other ones but it's not documented. Concerning the logs, it's a very good idea, I pasted it here https://pastebin.com/1FDm0u9d I can see that the instructions are somehow clearly ignored https://pastebin.com/1FDm0u9d

Bil5

11/12/22, 7:43 AM

I finally managed to have it working, 2 things : First of all, f2fs is clearly rejected and will not work (at least for the root fs), I reindented all the instructions and I noticed an extra `/` at the end of a line. There was no complaint about it but it seems to have made the difference. Secondly, the `-1` works as expected. Last thing to mention, after a successful installation, I checked again the logs, they correspond to what was expected by the preseed file. Thanks a ton @GerardH.Pille to have helped debugging this!

Score:0

Server

DDJ

7/29/24, 5:49 PM

Not realy relevant at this pont anymore I guess, but here is my two cents. you need to add this line on your preseed.cfg

d-i partman-auto/choose_recipe select boot-root

Otherwise the preseed will never know that you want to use this particular recipe.

+ 0

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Debian automated install preseed auto partitioning seemingly ignored

TH: Debian automated install preseed auto partitioning ดูเหมือนจะถูกเพิกเฉย

RO: Partiționarea automată preseedată de instalare automată Debian aparent ignorată

RU: Автоматическая установка Debian, автоматическое разбиение на разделы preseed, по-видимому, игнорируется

VI: Debian tự động cài đặt phân vùng tự động chèn sẵn dường như bị bỏ qua

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