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Basic Question on Ansible - Creating Nodes


Hello all


I know this is basic but I'm starting off learning about Ansible and F5s. I'm following this lab guide:


I have configured a basic inventory as such:


[lb] f5 ansible_host=X.X.X.X ansible_user=admin private_ip=X.X.X.X ansible_ssh_pass=XXXXXXXX [webservers] host1 ansible_host=X.X.X.X host2 ansible_host=X.X.X.X


I then have my YAML file as follows:


--- - name: BIG-IP SETUP  hosts: lb  connection: local  gather_facts: false  tasks:  - name: CREATE NODES    bigip_node:      provider:        server: X.X.X.X        user: XXXX        password: XXXXXXX        server_port: 443        validate_certs: false      host: "{{hostvars[webservers].ansible_host}}"      name: "{{hostvars[webservers].inventory_hostname}}"    loop: "{{ groups[webservers] }}"


When I try to run this playbook I get the following error:


devlin@ubuntu-v20:~/ansible/f5/lab2$ ansible-playbook -i inventory bigip-node.yaml PLAY [BIG-IP SETUP] ***************************************************************************************************************** TASK [CREATE NODES] ***************************************************************************************************************** fatal: [f5]: FAILED! => {"msg": "'webservers' is undefined"} PLAY RECAP ************************************************************************************************************************** f5                        : ok=0   changed=0   unreachable=0   failed=1   skipped=0   rescued=0   ignored=0


What does it mean "webservers is undefined"?


Thank you?


F5 Employee
F5 Employee

how about you take a look at

have a read at the instructions.. it seems, the "{"msg": "'webservers' is undefined"}" error maybe not finding the inventory..

also when you run your playbook, try adding  -vvvv for more verbose output


Thanks ArvinF


Even if I explicitly tell the playbook which inventory file I get the same thing:

devlin@ubuntu-v20:~/ansible/f5/lab2$ ansible-playbook -i ~/ansible/f5/lab2/inventory bigip-node-3.yaml -vvv ansible-playbook 2.9.6 config file = /etc/ansible/ansible.cfg configured module search path = ['/home/devlin/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules'] ansible python module location = /usr/lib/python3/dist-packages/ansible executable location = /usr/bin/ansible-playbook python version = 3.8.2 (default, Jul 16 2020, 14:00:26) [GCC 9.3.0] Using /etc/ansible/ansible.cfg as config file host_list declined parsing /home/devlin/ansible/f5/lab2/inventory as it did not pass its verify_file() method script declined parsing /home/devlin/ansible/f5/lab2/inventory as it did not pass its verify_file() method auto declined parsing /home/devlin/ansible/f5/lab2/inventory as it did not pass its verify_file() method Parsed /home/devlin/ansible/f5/lab2/inventory inventory source with ini plugin   PLAYBOOK: bigip-node-3.yaml ************************************************************************************************************************************************************************************************ 1 plays in bigip-node-3.yaml   PLAY [BIG-IP SETUP] ******************************************************************************************************************************************************************************************************** META: ran handlers   TASK [CREATE NODES] ******************************************************************************************************************************************************************************************************** task path: /home/devlin/ansible/f5/lab2/bigip-node-3.yaml:9 fatal: [f5]: FAILED! => { "msg": "The task includes an option with an undefined variable. The error was: \"hostvars['webservers']\" is undefined\n\nThe error appears to be in '/home/devlin/ansible/f5/lab2/bigip-node-3.yaml': line 9, column 5, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n - name: CREATE NODES\n ^ here\n" }   PLAY RECAP ***************************************************************************************************************************************************************************************************************** f5 : ok=0 changed=0 unreachable=0 failed=1 skipped=0 rescued=0 ignored=0



I think you must loop on "webservers" group and interact on each "item":

--- - name: BIG-IP SETUP hosts: lb connection: local gather_facts: false tasks: - name: CREATE NODES bigip_node: provider: server: X.X.X.X user: XXXX password: XXXXXXX server_port: 443 validate_certs: false host: "{{hostvars[item].ansible_host}}" name: "{{hostvars[item].inventory_hostname}}" loop: "{{ groups[webservers] }}"




Hi cjunior


You were spot on, thank you very much. Reading the various Ansible documentation and blog posts I convinced myself the hostvars must refer to an actual name in the inventory. But looking at it like this, it makes much more sense now.