ansible playbook not printing the error message when disk is not defined

[Rajesh]

Hi all,

The below playbook is not printing an error message when the disk is not defined on a host. Could you please advise if I have made an mistake in the playbook. Thanks

• name: Create a partition
  hosts: all
  become: true
  become_user: root
  tasks:

• name: Gather disk info
  parted:
  device: /dev/sdb
  unit: MB
  register: device_info

• name: Print disk info
  debug:
  var: device_info

• name: Create partition
  parted:
  device: /dev/sdb
  number: 1
  part_start: 1MB
  part_end: 1200MB
  unit: MB
  state: present
  when: device_info.disk.size > 1200

• name: Print enough size is not available
  debug:
  msg: “Enough size is not available”
  when: device_info.disk.size < 1200

• name: Create 800MB partition
  parted:
  device: /dev/sdb
  number: 1
  part_start: 1MB
  part_end: 800MB
  unit: MB
  state: present
  when: device_info.disk.size < 1200

• name: Create file system
  filesystem:
  device: /dev/sdb1
  fstype: ext4
  force: yes

• name: Create /exam directory
  file:
  path: /exam
  state: directory
  owner: root
  group: root
  mode: ‘0755’

• name: mount File system
  mount:
  path: /exam
  src: /dev/sdb1
  fstype: ext4
  state: mounted

• name: No extra hard disk
  debug:
  msg: “No extra hard disk available”
  when: ansible_devices.sdb is undefined

$ ansible-playbook partition.yml

PLAY [Create a partition] ******************************************************************************************************************************************************************************************************************

TASK [Gathering Facts] *********************************************************************************************************************************************************************************************************************
ok: [ansible2.example.com]
ok: [ansible4.example.com]
ok: [ansible3.example.com]

TASK [Gather disk info] ********************************************************************************************************************************************************************************************************************
fatal: [ansible4.example.com]: FAILED! => {“changed”: false, “err”: “Error: Could not stat device /dev/sdb - No such file or directory.\n”, “msg”: “Error while getting device information with parted script: ‘/sbin/parted -s -m /dev/sdb – unit ‘MB’ print’”, “out”: “”, “rc”: 1}
ok: [ansible3.example.com]
ok: [ansible2.example.com]

TASK [Print disk info] *********************************************************************************************************************************************************************************************************************
ok: [ansible2.example.com] => {
“device_info”: {
“changed”: false,
“disk”: {
“dev”: “/dev/sdb”,
“logical_block”: 512,
“model”: “ATA VBOX HARDDISK”,
“physical_block”: 512,
“size”: 12885.0,
“table”: “msdos”,
“unit”: “mb”
},
“failed”: false,
“partitions”: [
{
“begin”: 1.05,
“end”: 1200.0,
“flags”: ,
“fstype”: “ext4”,
“name”: “”,
“num”: 1,
“size”: 1199.0,
“unit”: “mb”
}
],
“script”: “unit ‘MB’ print”
}
}
ok: [ansible3.example.com] => {
“device_info”: {
“changed”: false,
“disk”: {
“dev”: “/dev/sdb”,
“logical_block”: 512,
“model”: “ATA VBOX HARDDISK”,
“physical_block”: 512,
“size”: 1074.0,
“table”: “msdos”,
“unit”: “mb”
},
“failed”: false,
“partitions”: [
{
“begin”: 1.05,
“end”: 800.0,
“flags”: ,
“fstype”: “ext4”,
“name”: “”,
“num”: 1,
“size”: 799.0,
“unit”: “mb”
}
],
“script”: “unit ‘MB’ print”
}
}

TASK [Create partition] ********************************************************************************************************************************************************************************************************************
skipping: [ansible3.example.com]
ok: [ansible2.example.com]

TASK [Print enough size is not available] **************************************************************************************************************************************************************************************************
skipping: [ansible2.example.com]
ok: [ansible3.example.com] => {
“msg”: “Enough size is not available”
}

TASK [Create 800MB partition] **************************************************************************************************************************************************************************************************************
skipping: [ansible2.example.com]
ok: [ansible3.example.com]

TASK [Create file system] ******************************************************************************************************************************************************************************************************************
fatal: [ansible3.example.com]: FAILED! => {“changed”: false, “cmd”: “/sbin/mkfs.ext4 -F /dev/sdb1”, “msg”: “mke2fs 1.44.6 (5-Mar-2019)\n/dev/sdb1 is mounted; will not make a filesystem here!”, “rc”: 1, “stderr”: “mke2fs 1.44.6 (5-Mar-2019)\n/dev/sdb1 is mounted; will not make a filesystem here!\n”, “stderr_lines”: [“mke2fs 1.44.6 (5-Mar-2019)”, “/dev/sdb1 is mounted; will not make a filesystem here!”], “stdout”: “”, “stdout_lines”: }
fatal: [ansible2.example.com]: FAILED! => {“changed”: false, “cmd”: “/sbin/mkfs.ext4 -F /dev/sdb1”, “msg”: “mke2fs 1.44.6 (5-Mar-2019)\n/dev/sdb1 is mounted; will not make a filesystem here!”, “rc”: 1, “stderr”: “mke2fs 1.44.6 (5-Mar-2019)\n/dev/sdb1 is mounted; will not make a filesystem here!\n”, “stderr_lines”: [“mke2fs 1.44.6 (5-Mar-2019)”, “/dev/sdb1 is mounted; will not make a filesystem here!”], “stdout”: “”, “stdout_lines”: }

PLAY RECAP *********************************************************************************************************************************************************************************************************************************
ansible2.example.com : ok=4 changed=0 unreachable=0 failed=1 skipped=2 rescued=0 ignored=0
ansible3.example.com : ok=5 changed=0 unreachable=0 failed=1 skipped=1 rescued=0 ignored=0
ansible4.example.com : ok=1 changed=0 unreachable=0 failed=1 skipped=0 rescued=0 ignored=0

Regards,
Rajesh

[Rajesh]

Could someone please respond? Thanks

[Dick_Visser]

Your playbook IS printing an error when the disk is not defined. See below

Hi all,

The below playbook is not printing an error message when the disk is not defined on a host. Could you please advise if I have made an mistake in the playbook. Thanks

• name: Create a partition
  hosts: all
  become: true
  become_user: root
  tasks:

• name: Gather disk info
  parted:
  device: /dev/sdb
  unit: MB
  register: device_info

• name: Print disk info
  debug:
  var: device_info

• name: Create partition
  parted:
  device: /dev/sdb
  number: 1
  part_start: 1MB
  part_end: 1200MB
  unit: MB
  state: present
  when: device_info.disk.size > 1200

• name: Print enough size is not available
  debug:
  msg: “Enough size is not available”
  when: device_info.disk.size < 1200

• name: Create 800MB partition
  parted:
  device: /dev/sdb
  number: 1
  part_start: 1MB
  part_end: 800MB
  unit: MB
  state: present
  when: device_info.disk.size < 1200

• name: Create file system
  filesystem:
  device: /dev/sdb1
  fstype: ext4
  force: yes

• name: Create /exam directory
  file:
  path: /exam
  state: directory
  owner: root
  group: root
  mode: ‘0755’

• name: mount File system
  mount:
  path: /exam
  src: /dev/sdb1
  fstype: ext4
  state: mounted

• name: No extra hard disk
  debug:
  msg: “No extra hard disk available”
  when: ansible_devices.sdb is undefined

$ ansible-playbook partition.yml

PLAY [Create a partition] ******************************************************************************************************************************************************************************************************************

TASK [Gathering Facts] *********************************************************************************************************************************************************************************************************************
ok: [ansible2.example.com]
ok: [ansible4.example.com]
ok: [ansible3.example.com]

TASK [Gather disk info] ********************************************************************************************************************************************************************************************************************
fatal: [ansible4.example.com]: FAILED! => {“changed”: false, “err”: “Error: Could not stat device /dev/sdb - No such file or directory.\n”, “msg”: “Error while getting device information with parted script: ‘/sbin/parted -s -m /dev/sdb – unit ‘MB’ print’”, “out”: “”, “rc”: 1}

^^^^here

[Rajesh]

Thanks for the reply. The playbook is not printing message as per the below task.

• name: No extra hard disk
  debug:
  msg: “No extra hard disk available”
  when: ansible_devices.sdb is undefined

Thanks,
Rajesh

[Dick_Visser]

This is also correct. As the previous failure was already fatal, the
playbook will stop executing commands for that host
(ansible4.example.com).
You can also tell from the play recap.

[Rajesh]

Thanks again for your help. What needs to be done so that the below play will print the message?

• name: No extra hard disk
  debug:
  msg: “No extra hard disk available”
  when: ansible_devices.sdb is undefined

Thanks,
Rajesh

[Dick_Visser]

This should be moved all the way up, so that it is the first task.
Note that the majority of the subsequent tasks assume /dev/sdb is
available, while this is clearly not the case.
You should probably revise the playbook and add (more) conditionals.
For instance, one of the previous outputs you posted shows that the
playbook tried to create a filesystem on a device that is already
mounted.
The logic with 1200MB could also be improved. If the size is > 1200.
Create a 1200MB partition - that seems OK.
But when it's smaller than 1200, create a 800MB partition. What
happens if the device is less than 800MB?
Etc etc

[Rajesh]

Thanks Dick. I have modified the playbook and used “block”.

• name: Create partition
  hosts: all
  become: true
  become_user: root
  tasks:

• name: Gather disk info
  parted:
  device: /dev/sdb
  unit: GB
  register: device_info
  when: ansible_devices.sdb is defined

• name: Create 3000MiB partition
  block:

• name: Create 3000MiB partition
  parted:
  device: /dev/sdb
  number: 1
  part_start: 1MiB
  part_end: 3000MiB
  state: present
  when: ansible_devices.sdb1 is not defined

rescue:

• name: Could not create 3000MiB partition
  debug:
  msg: “{{ ansible_hostname }} does not have sufficient space”
  when: device_info.disk.size < 3000

• name: Create 800MiB partition
  parted:
  device: /dev/sdb
  number: 1
  part_start: 1MiB
  part_end: 800MiB
  state: present

always:

• name: /dev/sdb doesn’t exist
  debug:
  msg: “/dev/sdb doesn’t exist”
  when: ansible_devices.sdb is not defined

• name: Create file system
  filesystem:
  dev: /dev/sdb1
  fstype: ext4

• name: Create mountpoint
  file:
  path: /newpart
  state: directory
  owner: root
  group: root
  mode: ‘0755’

• name: Mount the file system
  mount:
  path: /newpart
  src: /dev/sdb1
  fstype: ext4
  state: mounted

$ ansible-playbook partition.yml

PLAY [Create partition] ********************************************************************************************************************************************************************************************************************

TASK [Gathering Facts] *********************************************************************************************************************************************************************************************************************
ok: [ansible4.example.com]
ok: [ansible5.example.com]
ok: [ansible3.example.com]
ok: [ansible2.example.com]

TASK [Gather disk info] ********************************************************************************************************************************************************************************************************************
skipping: [ansible5.example.com]
ok: [ansible4.example.com]
ok: [ansible3.example.com]
ok: [ansible2.example.com]

TASK [Create 3000MiB partition] ************************************************************************************************************************************************************************************************************
fatal: [ansible5.example.com]: FAILED! => {“changed”: false, “err”: “Error: Could not stat device /dev/sdb - No such file or directory.\n”, “msg”: “Error while getting device information with parted script: ‘/sbin/parted -s -m /dev/sdb – unit ‘KiB’ print’”, “out”: “”, “rc”: 1}
fatal: [ansible3.example.com]: FAILED! => {“changed”: false, “err”: “Error: The location 3000MiB is outside of the device /dev/sdb.\n”, “msg”: “Error while running parted script: /sbin/parted -s -m -a optimal /dev/sdb – unit KiB mkpart primary 1MiB 3000MiB”, “out”: “”, “rc”: 1}
changed: [ansible2.example.com]
changed: [ansible4.example.com]

TASK [Could not create 3000MiB partition] **************************************************************************************************************************************************************************************************
fatal: [ansible5.example.com]: FAILED! => {“msg”: “The conditional check ‘device_info.disk.size < 3000’ failed. The error was: error while evaluating conditional (device_info.disk.size < 3000): ‘dict object’ has no attribute ‘disk’\n\nThe error appears to be in ‘/home/devops/ansible/partition.yml’: line 25, column 10, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n rescue:\n - name: Could not create 3000MiB partition\n ^ here\n”}
ok: [ansible3.example.com] => {
“msg”: “ansible3 does not have sufficient space”
}

TASK [Create 800MiB partition] *************************************************************************************************************************************************************************************************************
changed: [ansible3.example.com]

TASK [/dev/sdb doesn’t exist] *************************************************************************************************************************************************************************************************************
skipping: [ansible2.example.com]
ok: [ansible5.example.com] => {
“msg”: “/dev/sdb doesn’t exist”
}
skipping: [ansible3.example.com]
skipping: [ansible4.example.com]

TASK [Create file system] ******************************************************************************************************************************************************************************************************************
fatal: [ansible5.example.com]: FAILED! => {“changed”: false, “msg”: “Device /dev/sdb1 not found.”}
ok: [ansible4.example.com]
ok: [ansible3.example.com]
ok: [ansible2.example.com]

TASK [Create mountpoint] *******************************************************************************************************************************************************************************************************************
ok: [ansible4.example.com]
ok: [ansible3.example.com]
ok: [ansible2.example.com]

TASK [Mount the file system] ***************************************************************************************************************************************************************************************************************
changed: [ansible3.example.com]
changed: [ansible2.example.com]
changed: [ansible4.example.com]

PLAY RECAP *********************************************************************************************************************************************************************************************************************************
ansible2.example.com : ok=6 changed=2 unreachable=0 failed=0 skipped=1 rescued=0 ignored=0
ansible3.example.com : ok=7 changed=2 unreachable=0 failed=0 skipped=1 rescued=1 ignored=0
ansible4.example.com : ok=6 changed=2 unreachable=0 failed=0 skipped=1 rescued=0 ignored=0
ansible5.example.com : ok=2 changed=0 unreachable=0 failed=2 skipped=1 rescued=1 ignored=0