How can i run a block of playbook instructions only if they pass the specified condition?

[Ankit]

I have got a playbook where i need to check if the host fact for reboot is set to true, i need to execute the rest of the instructions for that particular host in the inventory only if the reboot condition is true.

Following is the playbook. I would like to avoid executing all the tasks for the host where the condition ansible_facts['Pending_Reboot'] == false or when: ansible_facts['Pending_Reboot'] != false. In such case, the execution should be skipped for that particular host and move to next host in the inventory.

- hosts: all
  gather_facts: false
  tasks:
    - name: Check and Reboot Server based on Pending_Reboot Fact
      shell: "sleep 5 && reboot"
      async: 1
      poll: 0
      when: ansible_facts['Pending_Reboot'] == true


    - name: Pause for 10 seconds
      pause:
        seconds: 10


    - name: Wait for Re-connection
      wait_for_connection:
        connect_timeout: 5
        sleep: 5
        delay: 90
        timeout: 600


    - name: Run checkLinuxSystemUpdateStatusTask task file to re-validate Reboot Status
      include: checkLinuxSystemUpdateStatusTask.yml

What is the best and least time consuming way of doing this? I was checking the documentation for block but i am not sure if i can use the conditions for a block.

Thanks in Advance.

Regards,

Ankit

[Kai Stian Olstad]

On 25.02.2019 13:55, Ankit wrote:
> What is the best and least time consuming way of doing this? I was checking

> the documentation for *block *but i am not sure if i can use the conditions
> for a block.
Why not just test it?
or check the documentation for what block support?
https://docs.ansible.com/ansible/latest/reference_appendices/playbooks_keywords.html#block

BTW when is the list.


--
Kai Stian Olstad

[Ankit]

Ok, i tried this but block doesn't accept, retries. I have the following playbook currently. Here, until works but i am not able to figure out a way to limit the max number of iterations:

- hosts: all

  name: runLinuxSystemUpdate

  gather_facts: false

  tasks:

    - name: Set Facts if not present in Host.

      include: checkLinuxSystemUpdateStatusTask.yml

      when: ansible_facts['Missing_Hotfix_Patches'] is not defined or ansible_facts['Missing_Hotfix_Patches'] == ""

    - name: Iteration Block

      block:

        - name: Install Patches Block

          block:

            - name: Run InstallLinuxPatchesTask.yml Task File

              include: InstallLinuxPatchesTask.yml

          when: ansible_facts['Missing_Hotfix_Patches'] != '0' or ansible_facts['Missing_Security_Patches'] != '0'  

        - name: Reboot Machines Block

          block:

            - name: Run RebootLinuxMachinesTask.yml Task File

              include: RebootLinuxMachinesTask.yml

          when: ansible_facts['Pending_Reboot'] == true

        - name: Run checkLinuxSystemUpdateStatusTask task file to re-validate Update and Reboot Status

          include: checkLinuxSystemUpdateStatusTask.yml

          #when: update_result.stdout.find("The deployment of patches and packages was successfully") == -1

      until: ansible_facts['Missing_Hotfix_Patches'] != '0' and ansible_facts['Missing_Security_Patches'] != '0'
      retries: 3

Regards,

Ankit

[Kai Stian Olstad]

On 06.03.2019 08:59, Ankit wrote:
> Ok, i tried this but *block* doesn't accept, *retries.

If you have looked at the documentation I linked to you would see that retries is not allowed for a block, only task.
So you need to move your retries to the individual tasks.


> *I have the

> following playbook currently. Here, until works but i am not able to figure
> out a way to limit the max number of iterations:
>
> - hosts: all
>
> name: runLinuxSystemUpdate
>
> gather_facts: false
>
> tasks:
>
> - name: Set Facts if not present in Host.
>
> include: checkLinuxSystemUpdateStatusTask.yml
>
> when: ansible_facts['Missing_Hotfix_Patches'] is not defined or
> ansible_facts['Missing_Hotfix_Patches'] == ""
>
> - name: Iteration Block
>
> block:
>
> - name: Install Patches Block
>
> block:
>
> - name: Run InstallLinuxPatchesTask.yml Task File
>
> include: InstallLinuxPatchesTask.yml
>
> when: ansible_facts['Missing_Hotfix_Patches'] != '0' or
> ansible_facts['Missing_Security_Patches'] != '0'

When you not using rescue and/or always in block just having one task in a block has no meaning.

>
> - name: Reboot Machines Block
>
> block:
>
> - name: Run RebootLinuxMachinesTask.yml Task File
>
> include: RebootLinuxMachinesTask.yml
>
> when: ansible_facts['Pending_Reboot'] == true

Same here, this block has no meaning since it only on one task.

> - name: Run checkLinuxSystemUpdateStatusTask task file to re-validate
> Update and Reboot Status
>
> include: checkLinuxSystemUpdateStatusTask.yml
>
> #when: update_result.stdout.find("The deployment of patches and
> packages was successfully") == -1
>
> until: ansible_facts['Missing_Hotfix_Patches'] != '0' and
> ansible_facts['Missing_Security_Patches'] != '0'

> *retries: 3*

The retries you need to move to each task.

--
Kai Stian Olstad

[Ankit Vashistha]

Thanks Kai. 

I had all the tasks running with own retries but i was hoping to have retries condition for multiple tasks or a bunch of tasks having single condition and retries. It is strange that there is no way to get that done.

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