MAAS Custom Partitioning

Currently, MAAS doesn’t support custom partitioning through the MAAS dashboard for CentOS. However, you can utilize curtin to perform this task for you.

Here’s an example /etc/maas/preseeds/curtin_userdata_centos assuming /dev/vda is your disk:

#cloud-config

verbosity: 3
showtrace: true

block-meta:
    format: gpt

partitioning_commands:
    builtin: []
    01_partition_announce: ["echo", "'### Partitioning disk ###'"]
    01_partition_make_label: ["/sbin/parted", "/dev/vda", "-s", "'","mklabel","gpt","'"]
    02_partition_make_part: ["/sbin/parted", "/dev/vda", "-s", "'","mkpart","primary","1M","2M","'"]
    03_partition_set_name: ["/sbin/parted", "/dev/vda", "-s", "'","set","1","bios_grub","on","'"]
    04_partition_make_part: ["/sbin/parted", "/dev/vda", "-s", "'","mkpart","primary","2M","512M","'"]
    05_partition_make_part: ["/sbin/parted", "/dev/vda", "-s", "'","mkpart","primary","512M","5G","'"]
    06_partition_make_part: ["/sbin/parted", "/dev/vda", "-s", "'","mkpart","primary","5G","10G","'"]
    07_partition_make_part: ["/sbin/parted", "/dev/vda", "-s", "'","mkpart","primary","10G","20G","'"]
    08_partition_make_part: ["/sbin/parted", "/dev/vda", "-s", "'","mkpart","primary","20G","3500G","'"]
    09_partition_make_part: ["/sbin/parted", "/dev/vda", "-s", "'","mkpart","primary","3500G","3508G","'"]
    10_partition_announce: ["echo", "'### Creating filesystems ###'"]
    12_partition_make_fs: ["/sbin/mkfs", "-t", "ext4", "/dev/vda2"]
    13_partition_make_fs: ["/sbin/mkfs", "-t", "ext4", "/dev/vda3"]
    14_partition_make_fs: ["/sbin/mkfs", "-t", "ext4", "/dev/vda4"]
    15_partition_make_fs: ["/sbin/mkfs", "-t", "ext4", "/dev/vda5"]
    16_partition_make_fs: ["/sbin/mkfs", "-t", "ext4", "/dev/vda6"]
    17_partition_make_swap: ["sh", "-c", "mkswap /dev/vda7"]
    18_partition_label_fs: ["/sbin/e2label", "/dev/vda2", "maas-boot"]
    19_partition_label_fs: ["/sbin/e2label", "/dev/vda3", "maas-root"]
    20_partition_label_fs: ["/sbin/e2label", "/dev/vda4", "maas-usr"]
    21_partition_label_fs: ["/sbin/e2label", "/dev/vda5", "maas-var"]
    22_partition_label_fs: ["/sbin/e2label", "/dev/vda6", "maas-home"]
    23_partition_mount_fs: ["sh", "-c", "mount /dev/vda3 $TARGET_MOUNT_POINT"]
    24_partition_mkdir: ["sh", "-c", "mkdir $TARGET_MOUNT_POINT/boot"]
    25_partition_mkdir: ["sh", "-c", "mkdir $TARGET_MOUNT_POINT/usr"]
    26_partition_mkdir: ["sh", "-c", "mkdir $TARGET_MOUNT_POINT/var"]
    27_partition_mkdir: ["sh", "-c", "mkdir $TARGET_MOUNT_POINT/home"]
    28_partition_mount_fs: ["sh", "-c", "mount /dev/vda2 $TARGET_MOUNT_POINT/boot"]
    29_partition_mount_fs: ["sh", "-c", "mount /dev/vda4 $TARGET_MOUNT_POINT/usr"]
    30_partition_mount_fs: ["sh", "-c", "mount /dev/vda5 $TARGET_MOUNT_POINT/var"]
    31_partition_mount_fs: ["sh", "-c", "mount /dev/vda6 $TARGET_MOUNT_POINT/home"]
    32_partition_announce: ["echo", "'### Filling /etc/fstab ###'"]
    33_partition_make_fstab: ["sh", "-c", "echo 'LABEL=maas-root / ext4 defaults 0 0' >> $OUTPUT_FSTAB"]
    34_partition_make_fstab: ["sh", "-c", "echo 'LABEL=maas-boot /boot ext4 defaults 0 0' >> $OUTPUT_FSTAB"]
    35_partition_make_fstab: ["sh", "-c", "echo 'LABEL=maas-usr /usr ext4 defaults 0 0' >> $OUTPUT_FSTAB"]
    36_partition_make_fstab: ["sh", "-c", "echo 'LABEL=maas-var /var ext4 defaults 0 0' >> $OUTPUT_FSTAB"]
    37_partition_make_fstab: ["sh", "-c", "echo 'LABEL=maas-home /home ext4 defaults 0 0' >> $OUTPUT_FSTAB"]
    38_partition_make_fstab: ["sh", "-c", "echo '/dev/vda7 none swap sw 0 0' >> $OUTPUT_FSTAB"]


debconf_selections:
 maas: |
  {{for line in str(curtin_preseed).splitlines()}}
  {{line}}
  {{endfor}}

late_commands:
  maas: [wget, '--no-proxy', '{{node_disable_pxe_url}}', '--post-data', '{{node_disable_pxe_data}}', '-O', '/dev/null']

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