DevOps Mastery: CI/CD, Automation, and Linux Essentials for Production

In the fast-paced world of software development, DevOps bridges the gap between code and production. This guide dives deep into CI/CD pipelines, infrastructure automation, containerization, and Linux system management, with a focus on security, scalability, and best practices. Whether you’re deploying a Java app or managing cloud infrastructure, this post equips you with actionable examples and modern workflows.

Table of Contents

1. CI/CD: The Backbone of Modern Development

   • Continuous Integration (CI)
   • Continuous Deployment (CD)
   • Example: Jenkins Pipeline

2. Day-to-Day DevOps Activities

   • Monitoring & Alerting
   • Infrastructure as Code (IaC)
   • Collaboration Tools

3. Ansible: Configuring a Web Server Securely

   • Idempotent Playbook Example

4. Bash Scripting: Service Management with Error Handling

   • Restarting Apache Safely

5. Docker: Building and Deploying a Java App

   • Multi-Stage Dockerfile

6. Terraform: Secure Azure VM Deployment

   • SSH Keys & Network Security

7. Linux Commands: Modern Tools for Sysadmins

   • Permissions, Networking, and Troubleshooting

8. Security Best Practices

• Ansible Vault, Docker Hardening, Terraform State

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Automate Linux SysAdmin tasks with Ansible in 95+ examples - part 2

Ansible is a powerful open-source automation tool that allows you to manage and configure your infrastructure as code. Whether you're a beginner looking to install Ansible or an experienced user diving into advanced playbooks, this comprehensive guide has you covered. We'll walk you through various aspects of Ansible, from basic installations on different Linux distributions to executing complex automation tasks.

1. How to Install Ansible in Ubuntu 22.04 LTS

$ sudo apt update

$ sudo apt install ansible

Once installed, you can verify the installation:

$ ansible --version

Now, you're ready to use Ansible for automation tasks on your Ubuntu 22.04 system.

2. Ansible Ad-Hoc Commands: 

Example: Using the Ping Module and Retrieving Ansible Facts

$ ansible all -m ping

$ ansible all -m command -a "hostname"

$ ansible all -m setup

using the "ping" module, we executing commands, and retrieving Ansible facts from target node

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Automate Linux SysAdmin tasks with Ansible in 95+ examples - part 1

1. Decrypting an Ansible Vault

You have an Ansible Vault-encrypted file and need to decrypt it to access the secrets.

ansible-vault decrypt secret_file.yml

Ansible will prompt you for the Vault password used to encrypt the file.You can now access the decrypted data in secret_file.yml.

2.Using Ansible Vault in Ansible Playbooks

---

- name: Example Playbook

  hosts: localhost

  vars:

    sensitive_data: !vault |

      $ANSIBLE_VAULT;1.1;AES256

      66366232396135343865393765653837646562306361623863343535333563373362393865393338

You can create this encrypted variable using ansible-vault encrypt_string.

3.Checking Out Git Repositories via HTTPS with Ansible

You need to automate the process of checking out a Git repository hosted on HTTPS using Ansible.

Create a Playbook to Clone the Git Repository

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