hello,
Yes, this functionality can be implemented using the feature of dynamic
inventory.
Ansible can accept any kind of executable file as an inventory file, as
long as you can pass it to Ansible as a JSON. You could create a script
that can be run and will output JSON to stdout. Ansible will internally
call this script with the argument --list.
The JSON structure should however fulfill below requirements for ansible to
correctly interpret it as an inventory file:
1. JSON should have a dictionary of groups with each group
containing
a) A list of hosts
b) Group variables
2. JSON should contain a _meta dictionary that stores host
variables for all hosts individually inside a hostvars dictionary.
Below is the sample JSON example:
{
"group": {
"hosts": [
"192.168.1.1",
"192.168.1.2",
"192.168.1.3"
],
"vars": {
"ansible_user":
"admin"
}
},
"_meta": {
"hostvars": {
"192.168.1.1": {
"Server_Name": "TestVM1"
"HDD": "300GB"
"memory":"6GB"
},
"192.168.1.2": {
"Server_Name": "TestVM2"
"HDD": "200GB"
"memory":"4GB"
},
"192.168.1.3": {
"Server_Name": "TestVM3"
"HDD": "100GB"
"memory": "2GB"
}
}
}
}
Steps to create and verify a custom dynamic inventory:
1. Create a python script (let's say, myscript.py) that will generate a
JSON output in above structure.
2. Run the script manually to verify it returns the proper JSON response in
above structure when run with --list argument.
$ ./myscript.py --list
3. Verify using ping if Ansible is able to interpret hosts from the JSON
output.
$ ansible all -i myscript.py -m ping
4. Create a playbook to create and clone VM and provide this script as
inventory.
$ansible-playbook -i myscript.py main.yml
This inventory file can further be consumed in below playbook to create
virtual machines.
$main.yml
- name: Create VM guest
hosts: all
gather_facts: False
tasks:
- name: Deploy guest from template
vmware_guest
hostname"{{ hostvars.Server_Name }}"
disk:
- size_gb: "{{ hostvars.HDD }}"
hardware:
memory_mb: "{{ hostvars.memory }}"
template: "{{ template }}"
with_items: "{{ hosts }}"
Thanks
Soniya
On Friday, October 20, 2017 at 2:54:05 AM UTC+5:30, Hemant Kulkarni wrote:
>
> Hello All,
>
> I am new to Ansiable .my requirement is to Create VM from dynamic JSON
> Values ..For example below is output from my API
>
> "Server_details": [
> {
> "IP": "192.168.1.1",
> "Server_Name": "TestVM1"
> "HDD": "300GB"
> "memory":"4GB"
> },
> {
> "IP": "192.168.1.2",
> "Server_Name": "TestVM2"
> "HDD": "200GB"
> "memory":"4GB"
> },
> {
> "IP": "192.168.1.3",
> "Server_Name": "TestVM3"
> "HDD": "100GB"
> "memory": "4GB"
> }
> ]
> }
> }
>
> Now I want to create 3 VM and Clone from template , question is how i
> setup VMname , VMIP address, VM memory and VM cpU from about data ..
>
>
> Thanks ...HeM
>
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