How to do Ansible conditional include_vars?

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1

Hi,

I am trying to use include_vars based on when condition as follows:

- include_vars: clouderamanager.yml
  when: "'{{ inventory_hostname }}' in groups['hadoop-clouderamanager']"

- include_vars: hadoop-namenode.yml
  when: "'{{ inventory_hostname }}' in groups['hadoop-namenode']"

- include_vars: resourcemanager.yml
  when: "'{{ inventory_hostname }}' in groups['hadoop-resourcemanager']"

- include_vars: spark-history-server.yml
  when: "'{{ inventory_hostname }}' in groups['spark-history-server']"

I am getting ERROR! Syntax Error while loading YAML.

The error appears to have been in '~/ansible/roles/hadoop-master/tasks/main.yml': line 4, column 36, but may be elsewhere in the file depending on the exact syntax problem.

The offending line appears to be:

- include_vars: clouderamanager.yml
  when: '{{ inventory_hostname }}' in groups['hadoop-clouderamanager']
                                   ^ here

What I am missing here ?

Thanks

2

a) you are using {{}} in when clause
b) you start a YAML value by a quote but do not end by a quote
c) you want this:

when: inventory_hostname in groups[‘hadoop-clouderamanager’]

or

when: “‘hadoop-clouderamanager’ in group_names”

3

Sorry if I have this wrong - the nested YAML quote thing is hurting my
eyes - but I think you can do what you want with group_vars - have a
look at the docs for that.

4

Hi Brian, thanks for your reply.

I tried your both suggestion now getting another error

for when: “‘hadoop-namenode’ in group_names”

`

TASK [hadoop-master : include_vars] ********************************************
fatal: [hnn001.dev.abc.com]: FAILED! => {“failed”: true, “msg”: “The conditional check ‘inventory_hostname in groups[‘hadoop-namenode’]’ failed. The error was: error while evaluating conditional (inventory_hostname in groups[‘hadoop-namenode’]): Unable to look up a name or access an attribute in template string. Make sure your variable name does not contain invalid characters like ‘-’.\n\nThe error appears to have been in ‘~/ansible/roles/hadoop-master/tasks/main.yml’: line 6, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- include_vars: namenode.yml\n ^ here\n”}

`

This is what I have in my namenode.yml

`

role : hadoop-namenode

monitoring_tags : “”

datadog_http_checks:

  • name: Magnetic {{ env }} NameNode
    url : http://{{ inventory_hostname }}:50070/dfshealth.jsp
    threshold : 5
    window : 5
    timeout : 10

`

If I remove the when: inventory_hostname in groups[‘hadoop-namenode’] then it works as expected.

any idea why I am missing here ?

5

error suggests that the ‘hadoop-namenode’ group does not exist

6

Thanks Brian, It got working after fixing the host group