{'msg': 'AnsibleUndefinedVariable: One or more undefined variables: list object has no element 1', 'failed': True}

[Chanaka Samarajeewa]

Hello,

For some reason, when my group_vars list only has 1 item under "test2:" it get the following error. If I have more than 1 list item under "test2:" then everything works correctly. Is this an Ansible bug or do I need to do something differently?

 {'msg': 'AnsibleUndefinedVariable: One or more undefined variables: list object has no element 1', 'failed': True}

group vars:

-----------------

---

VPCRegions:

  test1:

    - vpc1

    - vpc2

  test2:

    - vpc1

template:

--------------

{

"Resources" : {

{% set list_length = item.values()|length %}

{% for index in range(list_length) %}

"TomcatManager{{ item.value[index]|replace("-", "") }}" : {

  "Type" : "AWS::EC2::SecurityGroup",

  "Properties" : {

 "GroupDescription" : "8080",

 "VpcId" : "{{ item.value[index] }}",

 "SecurityGroupIngress" : [

{

"IpProtocol" : "tcp",

"FromPort" : "8080",

"ToPort" : "8080",

"CidrIp" : "0.0.0.0/0"

}

],

 "SecurityGroupEgress" : [   

  {

 "IpProtocol" : "tcp",

 "FromPort" : "8080",

 "ToPort" : "8080",

 "CidrIp" : "0.0.0.0/0"

  }   

  ]

  }

},

{% endfor %}

{% set list_length = item.values()|length %}

{% for index in range(list_length) %}

"SSH{{ item.value[index]|replace("-", "") }}" : {

  "Type" : "AWS::EC2::SecurityGroup",

  "Properties" : {

 "GroupDescription" : "22",

 "VpcId" : "{{ item.value[index] }}",

 "SecurityGroupIngress" : [

   {% for ip in ips %}

{

"IpProtocol" : "tcp",

"FromPort" : "22",

"ToPort" : "22",

"CidrIp" : "{{ ip }}/32"

}

{% if not loop.last %}

,

{% endif %}

{% endfor %}

]

}

}

{% if not loop.last %}

,

{% endif %}

{% endfor %}

} 

}

main.yml task

---------------------

---

# Generate Cloudformation securitygroup templates for each region

- name: create cloudformation json templates for each region

  tags:

    - cloudformation-templates

  local_action:

    module: template src=tomcat-ssh-securitygroups.j2 dest=/tmp/tomcat-ssh-securitygroups-{{ item.key }}.json

  with_dict: VPCRegions

# run each template for each region in AWS

- name: create webservers & ssh security groups in based on template for all vpcs in region list

  with_dict: VPCRegions

  cloudformation:

    stack_name: "chanaka-cloudformation"

    state: "present"

    region: "{{ item.key }}"

    disable_rollback: true

    template: "/tmp/tomcat-ssh-securitygroups-{{ item.key }}.json"

[Brian Coca]

So lists have 0 based indices, if you try to access item '1' when the
list only has 1 item (really item '0') you will get this error.

I think this expression is the culprit:

{% set list_length = item.values()|length %}

as with_dict should return item.key and item.value, not sure what
item.values() is doing.

--
Brian Coca