Unsure what sap_swap does and how swap is decided

[rdvansloten]

Hi,

I want to configure my swap per type of machine, and came upon a block of code I do not quite understand:

- include_tasks: swap.yml
  loop: "{{ sap_swap }}"
  when: item.tier == "HANA" or item.tier == "all"

I investigated sap_swap, which is an array with all/HANA, with 2 different swap sizes.

sap_swap:
  - { tier: 'all',  swap_size_mb: '20480' }
  - { tier: 'HANA', swap_size_mb: '2048' }

How does this script differentiate between machine "tiers"? Won't the linked swap.yml that is being looped always apply the last value of this array? I don't see a reference to tiers anywhere.

- name:         "Ensure swapfile size"
  lineinfile:
    state:      present
    dest:       /etc/waagent.conf
    regexp:     'ResourceDisk.SwapSizeMB='
    line:       'ResourceDisk.SwapSizeMB={{ item.swap_size_mb }}'

I am probably missing something, but where is tier coming from and how is a VM identified as having one tier or another?

[mimergel]

Hi @rdvansloten , sorry for late reply. I overlooked the notification mail from github. The differentiation happens in the devops pipeline where the ansible tasks receives the inventory. Here the private IP is in the HANA sections, thus the deployed VM will receive the small swap space of 2 GB.

- task: Ansible@0
  displayName: 'OS Preparations RHEL8 / SLES 15(Ansible)'
  inputs:
    ansibleInterface: 'agentMachine'
    playbookPathOnAgentMachine: '$(System.DefaultWorkingDirectory)/Ansible/os-settings_playbook.yml'
    inventoriesAgentMachine: inlineContent
    inventoryInlineContentAgentMachine: |
      **[hana]**
      $(privateip)