IaC | Luis Cacho

How to find the last element in an array using jsonpath

Thu, 22 Jun 2023 00:00:00 +0000

- name: Get Operator StartingCSV - {{ operator_name }}
 command: oc get packagemanifest {{ operator_name }} -n openshift-marketplace -o jsonpath='{.status.channels[-1:].currentCSV}'
 changed_when: false
 register: reg_operator_csv

Populate an Ansible Fact from a loop

Thu, 22 Jun 2023 00:00:00 +0000

tasks:
 - name: Get list of elements from list_vars
 set_fact:
 my_new_list: "{{ my_new_list | default([]) | union([item]) }}"
 loop: "{{ list_vars }}"

 - name: Get list of elements from list_vars 
 set_fact:
 my_new_list: "{{ my_new_list | default([]) + [item] }}"
 loop: "{{ list_vars }}"

Sum numbers over loop

Tue, 29 Nov 2022 00:00:00 +0000

- set_fact:
 total: "{{ total|default(0)|int + item|int }}"
 loop:
 - 1
 - 4
 - 3

- debug: var=total

References:

¹ Sum numbers over loop

https://stackoverflow.com/questions/50543108/ansible-can-i-sum-numbers-over-loop ↩︎

Ansible variable with dot in name

Wed, 09 Mar 2022 00:00:00 +0000

Given the next variable outoput, we want to get the value for user_namespace.enable

- debug:
 msg: "{{ ansible_cmdline }}"

Give us:

"msg": {
 "BOOT_IMAGE": "/vmlinuz-...",
 "LANG": "...",
 "crashkernel": "...",
 "namespace.unpriv_enable": "...",
 "quiet": ...,
 "rd.lvm.lv": "...",
 "rhgb": ...,
 "ro": ...,
 "root": "...",
 "user_namespace.enable": "1"
}

To access it we need to do:

- debug:
 msg: "{{ ansible_cmdline['user_namespace.enable'] }}"

References:

¹ Stackoverflow solution
² Ansible Documentation

Jinja Loops

Wed, 25 Aug 2021 00:00:00 +0000

Initial example

{% set count = 1 %}
{% for i in p %}
 {{ count }}
 {% set count = count + 1 %}
{% endfor %}

Ansible example to access each item within the output of a previous command:

- name: Gather Nodes Status
 ansible.builtin.command: oc get node {{ item }} -o=jsonpath='{@.metadata.name}{range @.status.conditions[*]}{@.status}{end}'
 changed_when: false
 loop: "{{ ocp_nodes.stdout_lines }}"
 register: ocp_nodes_status

{% set count = 0 %}
{% for i in ocp_nodes_status.results | map(attribute='stdout_lines') %}
 {% for j in ocp_nodes_status.results[count].stdout_lines %}
 {{ j }}
 {% endfor %}
 {% set count = count + 1 %}
{% endfor %}

Select and Sum dictionary values selecting a pattern

Tue, 24 Aug 2021 00:00:00 +0000

The Dictionary

FS:
 - nom_FS: /appm/oracle/product
 nom_LV: lv_product
 size_FS: 5
 owner_FS: oracle
 group_FS: dba
 vg_name: vgapplis

 - nom_FS: /appm/oracle/product/12.1.0.2
 nom_LV: lv_12102
 size_FS: 15
 owner_FS: oracle
 group_FS: dba
 vg_name: vgapplis

 - nom_FS: /apps/oracle/logs
 nom_LV: lvlogs
 size_FS: 5
 owner_FS: oracle
 group_FS: dba
 vg_name: vglogs

The ansible tasks

tasks:
 - name: Calculate with selectattr, map and sum
 debug:
 msg: "{{ FS | selectattr('vg_name', 'equalto', 'vgapplis') | map(attribute='size_FS') | list | sum }}"

 - name: Calculate with json_query
 vars:
 sum_query: "[?vg_name=='vgapplis'].size_FS | sum(@)"
 debug:
 msg: "{{ FS | json_query(sum_query) }}"

References:

¹ Use select and map with Ansible

https://serverfault.com/questions/972403/use-select-and-map-with-ansible ↩︎

Ansible Environment variables

Thu, 19 Aug 2021 00:00:00 +0000

- hosts: localhost
 vars:
 kubeconfig_path: "{{ lookup('env','KUBECONFIG') }}"
 cloudflare_email: "{{ lookup('env','CF_EMAIL') }}"

export CF_EMAIL=<your_cloudflare_email>
export KUBECONFIG=~/.kube/config
ansible-playbook playbook.yml

References:

¹How to Inject Environment Variables into Ansible Playbooks

https://graspingtech.com/ansible-environment-variables/ ↩︎

ansible-docs

Tue, 10 Aug 2021 00:00:00 +0000

ansible-doc -t <plugin type> -l
ansible-doc inventory -l
ansible-doc -t inventory host_list

ansible-inventories

Tue, 10 Aug 2021 00:00:00 +0000

ansible-inventory -i <inventory file> --host_list
ansible-inventory --yaml -i <inventory file> --list --output inventory.yaml

Print variable results

Tue, 10 Aug 2021 00:00:00 +0000

- name: Print output from a variable results using jinja
 debug:
 msg: "{% for result in ocp_etcd_cert_file.results %}
 {{ result.stdout }}
 {% endfor %}"

- name: Another way to print a variable results
 debug:
 msg: "{{ ocp_etcd_cert_file.results | map(attribute='stdout') | list }}"