Question:
I have a dummy doubt that keeps me stuck for a long time. I have a very banal inventory file with hosts and variables:
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[lb] 10.112.84.122 [tomcat] 10.112.84.124 [jboss5] 10.112.84.122 ... [tests:children] lb tomcat jboss5 [default:children] tests [tests:vars] data_base_user=NETWIN-4.3 data_base_password=NETWIN data_base_encrypted_password= data_base_host=10.112.69.48 data_base_port=1521 data_base_service=ssdenwdb data_base_url=jdbc:oracle:thin:@10.112.69.48:1521/ssdenwdb |
The problem is that I need to access all these hosts and variables, in the inventory file, from the group_vars/all file.
I’ve tried the following manners to access the host IP:
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{{ lb }} "{{ hostvars[lb] }}" "{{ hostvars['lb'] }}" {{ hostvars[lb] }} |
To access a host variable I tried:
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"{{ hostvars[tests].['data_base_host'] }}" |
All of them are wrong!!! Can anyone help me find out the best practice to access hosts and variables, not from a playbook but from a variables file?
Let’s clarify.
Problem: Use a host declared in the inventory file in a variable file, let’s say: group_vars/all.
Example: I have a DB host with IP:10.112.83.37.
Inventory file:
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[db] 10.112.83.37 |
In the group:vars/all file I want to use that IP to build a variable.
group_vars/all file:
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data_base_url=jdbc:oracle:thin:@{{ db }}:1521/ssdenwdb |
In a template I use the variable built in the group_vars/all file.
Template file:
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oracle_url = {{ data_base_url }} |
The problem is that the {{ db }} variable in the group_vars/all file is not replaced by the DB host IP. The user can only edit the inventory file.
Answer:
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- name: host debug: msg="{{ item }}" with_items: - "{{ groups['tests'] }}" |
This piece of code will give the message:
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'10.112.84.122' '10.112.84.124' |
as
groups['tests'] basically return a list of unique ip addresses ['10.112.84.122','10.112.84.124'] whereas groups['tomcat'][0] returns 10.112.84.124.