After flasing the Alpine Linux extended ISO, partition a disk. For this action internet is required since `gptfdisk` is not included on the extended ISO, therefore it needs to be obtained from the repository.
The drive should be partitioned using `gdisk` (or `cfdisk`). It should have atleast two partitions with one `EFI System` partition and one `Linux filesystem` partition and look something like this:
| Number of partition | Size | Type |
|:-----:|:-----:|:-----:|
| 1 | 512 MB or more | EFI System |
| 2 | Rest of the drive | Linux filesystem |
Then to create the filesystem on the efi partition.
```
# mkfs.fat -F 32 -n efi /dev/<disk1>
```
And the encrypted filesystem on the root partition.