Where to put custom curtin storage configuration with RAID1 with mdadm?

Hi, I have a set of hundred machines with triple SSD drives, where I want to deploy Ubuntu 18.04 with MAAS version: 2.4.2 (7034-g2f5deb8b8-0ubuntu1).

I wanted to install Ubuntu on /dev/mdadm127 RAID1 devices, which should be possible with curtin configuration. I tried configuring RAID in GUI, and it didn’t work with message:

Custom storage configuration only supported on Ubuntu. Using flat layout.

When I try to install with flat layout, it curses about hardware RAID controller:

curtin: Installation started. (19.1-7-g37a7a0f4-0ubuntu1~18.04.1)

third party drivers not installed or necessary.

/dev/md127 (size=0): 1048576 bytes from 0 > size.

curtin: Installation failed with exception: Unexpected error while running command.

Command: ['curtin', 'block-meta', 'custom']

Exit code: 3

Reason: -

Stdout: /dev/md127 (size=0): 1048576 bytes from 0 > size.

        

Stderr: ''

What I want to do is manually re-configure storage with curtin. Before releasing the machine, I can read my current config with $ maas admin machine get-curtin-config tadswg:

Success.
Machine-readable output follows:
apt:
  preserve_sources_list: false
  primary:
  - arches:
    - default
    uri: http://archive.ubuntu.com/ubuntu
  proxy: http://10.100.70.24:8000/
  security:
  - arches:
    - default
    uri: http://archive.ubuntu.com/ubuntu
cloudconfig:
  maas-cloud-config:
    content: "#cloud-config\ndatasource:\n  MAAS: {consumer_key: bqeNggnjHbtbn8gcft,\
      \ metadata_url: 'http://10.100.70.24:5240/MAAS/metadata/',\n    token_key: DyMEt5GDsZVQxvGxqq,\
      \ token_secret: BUaPp2csacdkULq6ZwXdAAGt8dzD4Vbf}\n"
    path: /etc/cloud/cloud.cfg.d/90_maas_cloud_config.cfg
  maas-datasource:
    content: 'datasource_list: [ MAAS ]'
    path: /etc/cloud/cloud.cfg.d/90_maas_datasource.cfg
  maas-reporting:
    content: "#cloud-config\nreporting:\n  maas: {consumer_key: bqeNggnjHbtbn8gcft,\
      \ endpoint: 'http://10.100.70.24:5240/MAAS/metadata/status/tadswg',\n    token_key:\
      \ DyMEt5GDsZVQxvGxqq, token_secret: BUaPp2csacdkULq6ZwXdAAGt8dzD4Vbf,\n    type:\
      \ webhook}\n"
    path: /etc/cloud/cloud.cfg.d/90_maas_cloud_init_reporting.cfg
  maas-ubuntu-sso:
    content: '#cloud-config

      snappy: {email: admin@maas}

      '
    path: /etc/cloud/cloud.cfg.d/90_maas_ubuntu_sso.cfg
debconf_selections:
  grub2: grub2   grub2/update_nvram  boolean false
  maas: 'cloud-init   cloud-init/datasources  multiselect MAAS

    cloud-init   cloud-init/maas-metadata-url  string http://10.100.70.24:5240/MAAS/metadata/

    cloud-init   cloud-init/maas-metadata-credentials  string oauth_consumer_key=bqeNggnjHbtbn8gcft&oauth_token_key=DyMEt5GDsZVQxvGxqq&oauth_token_secret=BUaPp2csacdkULq6ZwXdAAGt8dzD4Vbf

    cloud-init   cloud-init/local-cloud-config  string apt:\n  preserve_sources_list:
    false\n  primary:\n  - arches: [default]\n    uri: http://archive.ubuntu.com/ubuntu\n  proxy:
    http://10.100.70.24:8000/\n  security:\n  - arches: [default]\n    uri: http://archive.ubuntu.com/ubuntu\napt_preserve_sources_list:
    true\napt_proxy: http://10.100.70.24:8000/\nmanage_etc_hosts: false\nmanual_cache_clean:
    true\nreporting:\n  maas: {consumer_key: bqeNggnjHbtbn8gcft, endpoint: ''http://10.100.70.24:5240/MAAS/metadata/status/tadswg'',\n    token_key:
    DyMEt5GDsZVQxvGxqq, token_secret: BUaPp2csacdkULq6ZwXdAAGt8dzD4Vbf,\n    type:
    webhook}\nsystem_info:\n  package_mirrors:\n  - arches: [i386, amd64]\n    failsafe:
    {primary: ''http://archive.ubuntu.com/ubuntu'', security: ''http://security.ubuntu.com/ubuntu''}\n    search:\n      primary:
    [''http://archive.ubuntu.com/ubuntu'']\n      security: [''http://archive.ubuntu.com/ubuntu'']\n  -
    arches: [default]\n    failsafe: {primary: ''http://ports.ubuntu.com/ubuntu-ports'',
    security: ''http://ports.ubuntu.com/ubuntu-ports''}\n    search:\n      primary:
    [''http://ports.ubuntu.com/ubuntu-ports'']\n      security: [''http://ports.ubuntu.com/ubuntu-ports'']\n

    '
early_commands:
  driver_00:
  - sh
  - -c
  - echo third party drivers not installed or necessary.
install:
  error_tarfile: /tmp/curtin-logs.tar
  log_file: /tmp/install.log
  post_files:
  - /tmp/install.log
  - /tmp/curtin-logs.tar
kernel:
  mapping: {}
  package: linux-signed-generic
late_commands:
  maas:
  - wget
  - --no-proxy
  - http://10.100.70.24:5240/MAAS/metadata/latest/by-id/tadswg/
  - --post-data
  - op=netboot_off
  - -O
  - /dev/null
network:
  config:
  - id: eno1
    mac_address: ac:1f:6b:bc:de:40
    mtu: 1500
    name: eno1
    subnets:
    - address: 10.100.70.228/24
      gateway: 10.100.70.1
      type: static
    type: physical
  - id: eno2
    mac_address: ac:1f:6b:bc:de:41
    mtu: 1500
    name: eno2
    subnets:
    - type: manual
    type: physical
  - address:
    - 10.100.70.24
    search:
    - maas
    type: nameserver
  version: 1
network_commands:
  builtin:
  - curtin
  - net-meta
  - custom
partitioning_commands:
  builtin:
  - curtin
  - block-meta
  - custom
reporting:
  maas:
    consumer_key: bqeNggnjHbtbn8gcft
    endpoint: http://10.100.70.24:5240/MAAS/metadata/status/tadswg
    token_key: DyMEt5GDsZVQxvGxqq
    token_secret: BUaPp2csacdkULq6ZwXdAAGt8dzD4Vbf
    type: webhook
storage:
  config:
  - id: sda
    model: INTEL SSDSC2KB48
    name: sda
    ptable: msdos
    serial: PHYF922104E4480BGN
    type: disk
    wipe: superblock
  - id: sdb
    model: INTEL SSDSC2KB48
    name: sdb
    serial: PHYF922102A6480BGN
    type: disk
    wipe: superblock
  - grub_device: true
    id: sdc
    model: INTEL SSDSC2KB48
    name: sdc
    ptable: gpt
    serial: PHYF922101PJ480BGN
    type: disk
    wipe: superblock
  - device: sdc
    flag: bios_grub
    id: sdc-part1
    number: 1
    offset: 4194304B
    size: 1048576B
    type: partition
    wipe: zero
  - id: nvme1n1
    model: INTEL SSDPE2KE016T8
    name: nvme1n1
    serial: PHLN928000TA1P6AGN
    type: disk
    wipe: superblock
  - id: nvme2n1
    model: INTEL SSDPE2KE016T8
    name: nvme2n1
    serial: PHLN928000831P6AGN
    type: disk
    wipe: superblock
  - id: nvme0n1
    model: INTEL SSDPE2KE016T8
    name: nvme0n1
    serial: PHLN928000811P6AGN
    type: disk
    wipe: superblock
  - id: nvme3n1
    model: INTEL SSDPE2KE016T8
    name: nvme3n1
    serial: PHLN928000QY1P6AGN
    type: disk
    wipe: superblock
  - device: sda
    id: sda-part1
    name: sda-part1
    number: 1
    offset: 4194304B
    size: 480096813056B
    type: partition
    uuid: 2266c72d-bccb-45ae-b3eb-ed7a6585acc8
    wipe: superblock
  - fstype: ext4
    id: sda-part1_format
    label: root
    type: format
    uuid: a1ee3691-936c-4bb7-82a3-8d6e2468e9ac
    volume: sda-part1
  - device: sda-part1_format
    id: sda-part1_mount
    path: /
    type: mount
  version: 1

But how do I write my own custom storage config? Feels like it should be some file in /etc/maas/preseeds, something like curtin_userdata, but what?

Thanks!

Hi @vasjaforutube ,

this message

Custom storage configuration only supported on Ubuntu. Using flat layout.

it’s note if you want to install something different from Ubuntu. Need to select this 3 hard drives and select from drop-down menu RAID1.

Hit:
wen you create RAID and after that start making partitions don’t use the whole space. Left free some space at end for some reason MaaS UI didn’t recognize correct spacing.

Best,
Stefan

1 Like