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Ansible For Linux by Examples

200+ Automation Examples For Linux System Administrator and DevOps

Luca Berton

Many Linux System Administrators struggle with Ansible, I created a book that gives you copy-and-paste Playbook code and solves the most common errors that you could use to save time every day. 

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About

About

About the Book

Ansible is an Open Source IT automation tool. This book contains all of the obvious and not-so-obvious best practices of Ansible automation. Every successful IT department needs automation nowadays for bare metal servers, virtual machines, could, containers, and edge computing. Automate your IT journey with Ansible automation technology.

You are going to start with the installation of Ansible in Enterprise and Community Linux using the most command package manager and archives.

Each of the 200+ lessons summarizes a module: from the most important parameter to some Ansible code and real-life usage. Each code is battle proved in the real life. Simplifying mundane activities like creating a text file, extracting and archiving, fetching a repository using HTTPS or SSH connections could be automated with some lines of code and these are only some of the long lists included in the course.

There are some Ansible codes usable in all the Linux systems, some specific for RedHat-like, Debian-like, and Suse-like.

The 20+ Ansible troubleshooting lesson teaches you how to read the error message, how to reproduce, and the process of troubleshooting and resolution.

Are you ready to automate your day with Ansible?

Examples in the book are tested with the latest version of Ansible 2.9+ and Ansible Core 2.11+.

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Author

About the Author

Luca Berton

Luca Berton is an Ansible Automation Expert who has been working with JPMorgan Chase & Co. and previously worked with the Red Hat Hat Ansible Engineer Team for three years. Published author of the Ansible for VMware by Examples and Ansible for Kubernetes by Examples best-seller of the Ansible By Example(s) practical book series and creator of the Ansible Pilot project. With more than 15 years of experience as a System Administrator, he has strong expertise in Infrastructure Hardening and Automation. Enthusiast of the Open Source supports the community, sharing his knowledge in different events of public access. Geek by nature, Linux by choice, Fedora, of course.

Leanpub Podcast

Episode 280

An Interview with Luca Berton

Contents

Table of Contents

Introduction

  1. Modern IT Infrastructure
  2. Whois Luca Berton

Ansible For Beginners With Examples

  1. What is Ansible
  2. Getting Started
  3. Inventory
  4. Playbook
  5. Variables
  6. Facts and Magic Variables
  7. Vault
  8. Conditional
  9. Loop
  10. Handler
  11. Role
  12. Ansible Best Practices

Install Ansible

  1. Ansible terminology - ansible vs ansible-core packages
  2. Installing Ansible in Red Hat Enterprise Linux (RHEL) 8 with Ansible Engine
  3. Installing Ansible in Ubuntu LTS: Universe and PPA Repositories Guide
  4. Install Ansible in Fedora
  5. Installing Ansible on CentOS 9 Stream
  6. Installing Ansible on SUSE Linux Enterprise Server (SLES)
  7. Installing Ansible with PIP
  8. Installing Ansible Core on Red Hat Enterprise Linux (RHEL) 9
  9. Installing Ansible in Amazon Linux
  10. Install Ansible in AlmaLinux 9

Ansible For Linux

  1. Test host availability - Ansible module ping
  2. How to print a text or a variable during the execution with Ansible
  3. Edit single-line text - Ansible module lineinfile
  4. Edit multi-line text - Ansible module blockinfile
  5. Read a file into a variable on host - Ansible lookup plugin file
  6. Reboot remote hosts - Ansible module reboot
  7. Checkout git repository via HTTPS - Ansible module git
  8. Checkout git repository via SSH - Ansible module git
  9. Copy files to remote hosts - Local to Remote - Ansible module copy
  10. Copy files from remote hosts - Remote to Local - Ansible module fetch
  11. Start and enable services on boot on Linux remote hosts - Ansible module service_facts, service
  12. Restart services on remote hosts - Ansible module service
  13. Stop and disable services on boot on remote hosts - Ansible module service_facts, service
  14. Apply a file template - Ansible module template - HTML placeholder
  15. Loop in file template - Ansible module template - Generate hosts file
  16. Schedule a Cron Job task in Linux - Ansible module cron
  17. Read a file from remote hosts - Ansible module slurp
  18. Read an environment variable - Ansible lookup plugin env”
  19. Permanently Set Remote System Wide Environment Variables on Linux - /etc/environment - Ansible module lineinfile
  20. Write a Variable to a File - Ansible module copy vs template

Ansible Tip & Tricks

  1. Pause execution - Ansible module pause
  2. How to Pass Variables to Ansible Playbook in command line? - Ansible extra variables
  3. Break a string over multiple lines - Ansible Literal and Folded Block Scalar operators
  4. Ansible terminology - ansible_hostname vs inventory_hostname vs ansible_fqdn
  5. Set remote environment per task or play - Ansible environment statement
  6. Execute command on the Ansible host - Ansible localhost
  7. Three options to Safely Limit Ansible Playbooks Execution to a Single Machine
  8. Filter A List By Its Attributes - Ansible selectattr filter
  9. Using Date, Time and Timestamp in Ansible Playbook - Ansible Tip and Tricks
  10. Using Date, Time and Timestamp without Facts in Ansible Playbook - Ansible date and lookup plugin
  11. Ansible Magic Variables - Ansible Tip and Tricks
  12. Ansible Playbook Dry Run - check and diff mode
  13. Ansible terminology - ansible_hostname vs inventory_hostname vs ansible_fqdn
  14. Set remote environment per task or play - Ansible environment statement
  15. Execute command on the Ansible host - Ansible localhost
  16. Three options to Safely Limit Ansible Playbooks Execution to a Single Machine
  17. Ansible modules - command vs shell
  18. Write a Variable to a File - Ansible module copy vs template

Ansible Code reuse: Roles and Collections with Ansible Galaxy

  1. Download and Use Ansible Galaxy Role - ansible-galaxy and requirements.yml
  2. Download and Use Ansible Galaxy Collection - ansible-galaxy and requirements.yml

Ansible for Linux Filesystem

  1. Create an empty file - Ansible module file
  2. Create a text file - Ansible module copy
  3. Check if a file exists - Ansible module stat
  4. How to create a directory with Ansible?
  5. How to check if a directory exists in Ansible?
  6. How to rename a file or directory using an Ansible task on a remote system?
  7. Change file permission - Ansible module file
  8. Add Execute Permission 755 Linux file - Ansible module file
  9. Delete file or directory - Ansible module file
  10. Download a file - Ansible module get_url
  11. Extract an archive - Ansible module unarchive
  12. Create a symbolic link (also symlink or soft link) in Linux - Ansible module file
  13. Create a hard link in Linux - Ansible module file
  14. Mount a Windows share in Linux SMB/CIFS - Ansible module mount
  15. Mount an NFS share in Linux - Ansible module mount
  16. Concatenate multiple files in a specific order - Ansible module template and YAML
  17. Backup With Rsync - Local to Remote - Ansible module synchronize
  18. How to Delete Only Files Inside a Directory - Ansible module find
  19. Find All Files with Extension - Ansible module find
  20. Search for a String in a File -Ansible module lineinfile
  21. Links
  22. Create ISO image from Files and Folders - Ansible module iso_create

Ansible For Linux User Management

  1. Ansible create a user account
  2. Ansible remove user account
  3. Ansible change user password
  4. Ansible disable user account
  5. Ansible enable user account
  6. Ansible user password expiration
  7. Ansible creates a group
  8. Ansible deletes a group account
  9. Ansible changes the User Primary Group on Linux
  10. Ansible adds a user to a secondary group(s)

Ansible Playbook Code interact with Web Services API

  1. Submit a GET request to a REST API endpoint - Interact with web services - Ansible module uri
  2. Token-Based Authentication in REST API - Interact with web-service - Ansible module uri - Authentication request using the REST API token

Ansible For Linux Security

  1. Set sysctl kernel parameters - Ansible module sysctl
  2. Load and Unload Kernel Modules in Linux - Ansible module modprobe
  3. Set the SELinux Policy States and Modes on Linux - Ansible module selinux
  4. Configure Kernel Parameters in RedHat-like Linux systems - Ansible system role
  5. Enable or Disable SELinux Boolean on Linux - Ansible module seboolean
  6. Enable or Disable Permissive Domain in SELinux policy on Linux - Ansible module selinux_permissive
  7. Vulnerability Scanner/Detector Log4Shell Remote Code Execution Log4j (CVE-2021–44228) — Ansible log4j-cve-2021–44228

Ansible Playbook Code for RedHat-like systems

  1. Register a system with Red Hat Subscription-Manager - Ansible module redhat_subscription
  2. Install a package in RedHat like systems - Ansible module yum
  3. Rolling Update RedHat like systems - Ansible module yum
  4. Open firewall ports in RedHat like systems - Ansible module firewalld
  5. Install Google Chrome in RedHat-like systems - Ansible module rpm_key, yum_repos
  6. Install Microsoft Edge in RedHat-like systems - Ansible module rpm_key, yum_repository and yum
  7. NFS Server - Export an NFS Share in RedHat-like systems: RHEL, CentOS, CentOS Stream, Fedora - Ansible modules yum, file, lineinfile, command, firewalld, service
  8. Deploy a web server apache httpd on RedHat-like systems - Ansible modules yum, copy, service firewalld
  9. Deploy a proxy server squid on RedHat-like systems - Ansible modules yum, template, service and firewalld
  10. Deploy a web server apache httpd virtualhost on RedHat-like systems - Ansible modules yum, file, copy, template, service and firewalld

Ansible Playbook Code for Debian-like systems

  1. Install a package in Debian like systems - Ansible module apt
  2. Rolling Update Debian-like systems - Ansible module apt
  3. Open firewall ports in Debian like systems - Ansible module ufw
  4. Install Google Chrome in Debian-like systems - Ansible module apt_key, apt_repos
  5. Install Microsoft Edge in Debian-like systems - Ansible module apt_key, apt_repository and apt
  6. Deploy a web server apache httpd on Debian-like systems - Ansible modules apt, copy, service and ufw
  7. Deploy a web server apache httpd virtual host on Debian-like systems - Ansible modules apt, file, copy, template, command, ufw and service

Ansible Playbook Code for Suse-like systems

  1. Install a package in Suse-like systems - Ansible module zypper
  2. Install Google Chrome in Suse-like systems - Ansible module rpm_key, zypper_repo

Ansible For Containers

  1. Ansible install Docker in Debian-like systems
  2. Ansible install Docker in RedHat-like systems
  3. Install Zoom flatpak in Debian-like systems - Ansible module flatpak
  4. Install Zoom flatpak in RedHat-like systems - Ansible module flatpak
  5. Update Zoom flatpak(s) in Linux systems - Ansible module command
  6. Install Spotify snap in Debian-like systems - Ansible module snap
  7. Install Spotify snap in RedHat-like systems - Ansible module snap
  8. Deploy Apache Web Server in a Docker Container for Debian-like systems - Ansible modules docker_image and docker_container
  9. Deploy Apache Web Server in a Podman Container for RedHat-like systems - Ansible modules podman_image and podman_container

Ansible For Kubernetes

  1. Install Red Hat CodeReady Containers to run OpenShift 4 in macOS
  2. Create Kubernetes K8s or OpenShift OCP namespace project - Ansible module k8s
  3. Create Kubernetes K8s or OpenShift OCP Pod - nginx - Ansible module k8s
  4. Create Kubernetes K8s or OpenShift OCP Secret - Ansible module k8s
  5. Create Kubernetes K8s or OpenShift OCP service - Ansible module k8s
  6. Assign CPU Resources to Kubernetes K8s or OpenShift OCP Containers and Pods — Ansible module k8s
  7. Assign Memory Resources to Kubernetes K8s or OpenShift OCP Containers and Pods - Ansible module k8s
  8. Configure a Pod to Use a Volume for Storage - Ansible module k8s
  9. Apply Multiple Yaml Files at Once on Kubernetes K8s or OpenShift OCP - Ansible module k8s and lookup plugin fileglob

Ansible Troubleshooting The Most Common Errors

  1. Ansible troubleshooting - connection failed
  2. Ansible troubleshooting - macOS fork error
  3. Ansible troubleshooting - indentation error
  4. Ansible troubleshooting - syntax error
  5. Ansible troubleshooting - undefined variable
  6. Ansible troubleshooting - invalid argument
  7. Ansible troubleshooting - privilege escalation error
  8. Ansible troubleshooting - missing sudo password and incorrect sudo password
  9. Ansible troubleshooting - missing module parameter
  10. Ansible troubleshooting - failure downloading
  11. Ansible troubleshooting - chgrp failed
  12. Ansible troubleshooting - not a valid attribute for a Play error
  13. Ansible troubleshooting - fatal template error while templating string
  14. Ansible troubleshooting - PowerShell incompatible with the sudo become plugin
  15. Ansible troubleshooting - passwordless account
  16. Ansible troubleshooting - user module password_expiry_min bug
  17. Ansible troubleshooting - urlopen error
  18. Ansible troubleshooting - destination does not exist
  19. Ansible troubleshooting - Destination does not exist rc 257
  20. Ansible troubleshooting - “role not found” error
  21. Ansible troubleshooting - permission denied Errno 13
  22. Ansible troubleshooting - VARIABLE IS NOT DEFINED! ansible_hostname
  23. Ansible troubleshooting - This command has to be run under the root user
  24. Ansible troubleshooting - Kubernetes K8s or OpenShift OCP 401 Unauthorized

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