Ansible 'fatal: template error while templating string' Fix (Guide) — Video Tutorial

Fix Ansible template error while templating string. Resolve undefined variables, syntax errors, and Jinja2 issues in playbooks and templates with examples.

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What You'll Learn

Introduction
The Demo
Understanding the Error
Fixing the Code
Conclusion
Playbook
error code
error execution
fix code
fix execution

Full Tutorial Content

Introduction Welcome to another episode of Ansible Pilot! I'm Luca Berton, and today we'll be diving into Ansible troubleshooting, focusing on the "FATAL template error while templating string" runtime error. Join me as we explore how to reproduce, troubleshoot, and fix this challenging issue. The Demo Let's jump straight into a live Playbook to understand the error practically. In this example, we have a playbook (`template_error_string_error.yml`) attempting to create an empty file with a variable referencing `~/example.txt`. ```yaml template_error_string_error.yml --- - name: file module demo hosts: all vars: myfile: "{{ ~/example.txt }}" tasks: - name: Creating an empty file ansible.builtin.file: path: "{{ myfile }}" state: touch ``` Executing this playbook (`ansible-playbook -i inventory template_error_string_error.yml`) results in a fatal error: ```bash TASK [Creating an empty file] *********************************************************************************************************** fatal: [demo.example.com]: FAILED! => {"msg": "An unhandled exception occurred while templating '{{ ~/example.txt }}'. Error was a , original message: template error while templating string: unexpected '~'. String: {{ ~/example.txt }}"} ``` Understanding the Error The error message is clear: "template error while templating string: unexpected '~'." The issue lies in the attempt to use the tilde (`~`) symbol in the variable, which is not a valid attribute for templating. Fixing the Code To resolve the issue, we need to correct our playbook. The fixed version (`template_error_string_fix.yml`) uses the correct variable format: ```yaml template_error_string_fix.yml --- - name: file module demo hosts: all vars: myfile: "~/example.txt" tasks: - name: Creating an empty file ansible.builtin.file: path: "{{ myfile }}" state: touch ``` Executing the fixed playbook (`ansible-playbook -i Playbook/inventory troubleshooting/template_error_string_fix.yml`) should now complete without errors: ```bash TASK [Creating an empty file] *********************************************************************************************************** changed: [demo.example.com] ``` Conclusion In this tutorial, we walked through reproducing, troubleshooting, and fixing the "FATAL template error while templating string" error in Ansible. The key takeaway is to ensure that variables are formatted correctly in your playbooks. I hope this guide helps you navigate and resolve similar issues in your Ansible automation journey. If you found this information valuable, consider subscribing for more Ansible insights. Playbook The best way of talking about Ansible troubleshooting is to jump in a live Playbook to show you practically the `not a valid attribute for a Play` error and how to solve it! error code - template_error_string_error.yml ```yaml --- - name: file m

About This Tutorial

Author: Luca Berton
Difficulty: Advanced
Read time: 6 min
Category: installation

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