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Docker is a widely used open-source platform and tool for containerization, which is a technology for packaging and running applications and their dependencies in a consistent and isolated environment known as a container. Docker has revolutionized the way software is developed, shipped, and deployed by making it easier to create, deploy, and manage applications in a lightweight and portable container format. Here's an overview of Docker:

**Key Concepts:**

1. **Container**: A container is a lightweight and standalone executable package that includes an application, its runtime, libraries, and system tools, all bundled together. Containers run consistently on any environment that supports the Docker platform.

2. **Docker Engine**: The Docker Engine is the core component of Docker. It is responsible for running containers and managing images, as well as providing the necessary APIs and tools for interacting with Docker.

3. **Images**: Docker images are read-only templates used to create containers. They contain everything needed to run an application, including code, runtime, system tools, and libraries. Images are stored in a registry, such as Docker Hub, from which they can be pulled and run as containers.

4. **Containers**: Containers are instances of Docker images that run as isolated processes on the host system. They are lightweight, fast to start, and can be easily created, destroyed, and scaled.

5. **Dockerfile**: A Dockerfile is a text document that contains instructions for building a Docker image. It specifies the base image, software installation, configuration, and any other steps required to create a container.

6. **Docker Hub**: Docker Hub is a cloud-based registry where Docker users can find, share, and store Docker images. It contains a vast collection of public images, and users can also store their private images.

**Key Features:**

1. **Portability**: Docker containers are portable, meaning they can run consistently across various environments, such as development, testing, staging, and production, as long as Docker is available on those platforms.

2. **Isolation**: Containers provide a high degree of isolation, ensuring that applications do not interfere with each other and do not affect the underlying host system.

3. **Efficiency**: Containers are lightweight, and multiple containers can run on a single host, making efficient use of resources and allowing for higher density on a single server.

4. **Versioning**: Docker images can be versioned, making it easy to roll back to previous versions of an application if needed.

5. **Microservices**: Docker is commonly used for building and deploying microservices-based architectures, where different parts of an application are containerized and can be managed independently.

6. **Scalability**: Docker containers can be easily scaled up or down based on demand, making it well-suited for auto-scaling in cloud environments.

7. **Orchestration**: Docker provides tools for container orchestration, such as Docker Compose for defining multi-container applications and Kubernetes for managing containerized applications in a cluster.

8. **Security**: Docker provides security features, including isolation using Linux namespaces and cgroups, as well as support for security profiles and policies.

**Use Cases:**

Docker is used in various scenarios, including:

- Application development and testing.
- Continuous integration and continuous delivery (CI/CD).
- Creating development environments that match production.
- Packaging and distributing software.
- Running microservices architectures.
- Building scalable and resilient applications in the cloud.

Docker has had a significant impact on modern software development and deployment practices, providing developers and operators with a consistent, efficient, and flexible way to work with applications and their dependencies.



[[https://www.youtube.com/watch?v=eGz9DS-aIeY|you need to learn Docker RIGHT NOW!! // Docker Containers 101]]

[[https://stackoverflow.com/questions/42158596/can-windows-containers-be-hosted-on-linux|Can Windows containers be hosted on Linux?]]

[[https://certsimple.com/can-you-use-docker-to-run-windows-programs-on-linux/|Can You Use Docker To Run Windows Programs On Linux?]]

[[https://www.youtube.com/watch?v=bKFMS5C4CG0|
Docker networking is CRAZY!! (you NEED to learn it)]]



Master in DevOps : Docker Jenkins GIT CI Pipeline and Maven

https://www.udemy.com/devops-training/


What you'll learn

An understanding of DevOps and the modern DevOps toolsets

    The ability to automate all aspects of a modern code delivery and deployment pipeline

    Understand the concepts of continuous inspection, continuous integration, and continuous deployment, and the difference between them.

    Containerize a web-based application with a microservice approach and automate it using Dockerfile

    Create a multi-stage Jenkins job and visualize the complicated build pipeline with Jenkins build pipeline plugin.

    Hand's-on with best practices for making Dockerfiles and Compose files like a Pro!

    Create and manage repositories on GitHub

    Manage project defects or enhancement requests with GitHub Issues

    And many many more…



Understating of DevOps & DevOps Process

Introduction

Preview

What is DevOps || DevOps Tools

Preview13:43

Continuous Development

09:58

Continuous Testing

04:06

Continuous Integration

12:39

Continuous Deployment & Monitoring

08:32

–**GIT** Introduction & Installation

42:35

Git | WelCome & Goal

01:44

Audience & Study Tips

02:24

Key GIT Terminology

04:40

GIT Introduction

20:30

Install GIT on LINUX

04:23

Download and Install GIT on Windows

08:54

–GIT Quick Start

40:45

Configure User Information in GIT

09:27

Create First GIT Repository

09:24

First GIT Commit

09:23

Adding Files and GIT Logs

06:42

Understanding of GIT Workflow

05:49

–Bonus on Other Course

00:55

Bonus Lecture: Get my other courses at the maximum discount!

00:55

–Text Editor for GIT **Installation**

23:40

GIT Text Editor OverView

01:41

Install SubLime Text on Linux

04:03

Configure SubLime with GIT

05:56

NotePad ++ As GIT Editor for Windows

12:00

–Version Control System GIT & GITHUB

18:54

Verify Changes in GIT

09:33

Compare Stage Area with Local Repository in GIT

05:15

Delete File in GIT

04:06

–GIT with GITHUB **Advance**

01:03:28

Explore Git with GITHub

07:59

Create Centralized Repository

17:33

Create Branches in GIT

18:05

Merge Branches in GIT

12:09

Revert a Commit in GIT

07:42

–GIT Basics **Through Explanation**

01:29:19

Add GIT in Existing Project Part

10:22

Fork GitHub Existing Project

08:37

Git CLI Complete Workflow

10:44

Back-out GIT Changes

08:07

Delete File in GIT

08:49

Rename & Move File in GIT

13:39

Find Commit, File History in GIT

10:51

GIT Alias

07:02

Exclude Unwanted Files in GIT

11:08

–Comparisons in GIT

26:35

SetUp Git Project for Comparision

08:01

Compare Working Directory & Stage Area

06:42

Compare Work Directory and GIT Repo

03:15

Compare Stage Area & GIT Repo

03:51

Compare Commits in GIT

04:46

–Branching & Merging in GIT

35:33

Basics of Branches in GIT

08:16

Happy Path Merges in GIT

08:18

Auto Merge in GIT

09:12

Merge Conflicts & Resolution

09:47

–GIT Rebase

56:16

GIT Merge vs GIT Rebase

17:12

GIT Rebase Example

11:50

Create Merge Conflicts in Rebase

08:26

Resolve Merge Conflicts in GIT Rebase

05:37

Rebase Remote Repository in GIT

13:11

–GIT Stashing

47:27

GIT Stash with Example

16:21

Stash Untracked Files & Git Stash Pop

13:37

Manage Multiple Stash

09:24

Stashing into Branch

08:05

–GIT Tagging

29:50

GIT Tagging Introduction

07:54

GIT Annotated Tags

05:57

Compare Tags in GIT

07:44

Tag a Specific Commit in GIT

04:36

Update Tags in GIT

03:39

–GIT Common Mistakes and Fixes

32:04

Fixing Common Mistakes in GIT Part 1

10:05

Fixing Common Mistakes in GIT Part 2

12:38

Fixing Common Mistakes in GIT Part 3

09:21

–Project Build Tool : MAVEN

53:57

Maven Introduction

07:59

Configure Maven on Windows Machine

08:25

Configure Maven on Windows Machine : Text Direction

01:06

Project Code Location

00:06

Configure Maven on Mac Machine

06:01

Generate First Maven Project From Maven CLI

11:42

Maven Build Life Cycle

12:09

POM.xml File in Maven Project

06:29

–Continuous Integration || Jenkins Introduction

56:12

What is Continuous Integration || Need of Jenkins

12:39

Download and Configure Jenkins on Linux

13:56

Text Direction : Download & Configure Jenkins on Linux

00:46

Download & Configure Jenkins on Windows

12:33

Text Direction : Download & Configure Jenkins on Windows

03:01

Download and Configure Jenkins on Mac OS

12:08

Text Direction : Download & Configure Jenkins on Mac OS

01:04

Java 9,10 Warning

00:05

–Jenkins Getting Started

43:48

Jenkins Architecture

12:21

Create & Execute Jenkins Job

21:01

Install GIT & GitHub Plugin

10:26

–Continuous Integration | Jenkins Jobs

01:06:52

Configure Jenkins to Work With Java, GIT, Gradle, Maven

05:43

Create First Maven Base Jenkin Project

13:40

CookBook: Create First Maven Base Jenkin Project

00:33

Trouble Shooting: Create our First Maven-based Jenkins Project

00:29

Run Maven Project Via Jenkins

15:01

Trouble Shooting: Run our First Jenkins Build and Jenkins Workspace

00:46

Source Code Polling

18:12

Text Direction : Add SSH Key in Local from GitHUB

00:05

Build Trigger Options in Jenkins

12:19

Text Direction : GitHub Hook SetUp

00:02

–Continuous Inspection with Jenkins

20:08

Code Quality Check with Jenkins

19:57

Text Direction: Code Quality and Code Coverage Metrics Report

00:11

–Continuous Delivery with Jenkins

01:46:24

Archive Artefact in Jenkins

07:44

Install Tomcat as Staging Env

24:38

Deploy Staging Environment

26:30

The latest Deploy to Container plugin

00:25

Build PipeLine Intro

08:57

Jenkins Parallel Builds

06:04

Deploy to Production

31:46

Trouble Shooting: Deploy to Production

00:19

–Jenkins As Code Pipeline

01:33:45

Jenkins As Code Pipeline Overview

30:25

Text Lecture: Overview of Pipeline as Code

00:15

Code Pipeline : Build Project

26:19

Text Lecture: Build Pipeline

00:22

Code Pipeline : Deploy in Staging Env

15:59

Text Lecture: Deploy Staging Env

00:15

Code Pipeline : Deploy in Production Env

19:24

Text Direction : Deploy in Production Env

00:25

Trouble Shooting: Automate Code Pipeline

00:19

–Distributed Builds

01:15:21

Introduction to Distributed Builds

09:06

Text Direction : Distributed Builds Intro

00:02

Install Jenkins on Cloud

21:59

Text Direction : Install Jenkins on Cloud

00:50

Install Jenkins Slave on Cloud

33:45

Text Direction : Install Jenkins Slave on Cloud

00:25

Distributed Builds & Build Lebels

09:14

–Docker Setup and Installation

01:37:40

What is Docker

12:56

Where I will Find the Docker Resource

01:24

Getting Course Resources : GitHub Repo

00:37

Docker Edition : Which Do I Use?

08:35

Install Docker on Various Platforms: Text Direction

01:24

Docker For Windows

14:46

Text Direction: Docker on Windows

00:06

Docker on Mac Machine

19:02

Create Linux Machine on Cloud

12:35

Text Direction : Create Machine on Cloud

00:20

Install Docker on Linux Machine

21:20

Text Direction: Install Docker on Linux Machine

00:28

Terminal Shell and Tab Completion for Docker CLI

01:04

5 Facts Everyone Should Know about Containers

03:00

–Creating Docker Containers : Start Like a Beginner

01:42:50

Check Docker Install and Configurations

14:09

Start Your First Container

29:04

Stop-Remove the Containers

20:07

Docker Internal Processing

04:41

Containers vs Virtual Machines

12:30

Assignment : Manage Multiple Containers

07:41

Assignment Answer : Manage Multiple Containers

14:38

–Use Docker Containers : Advance

29:42

Docker CLI Monitoring

13:18

Start Container in Interactive Mode

06:51

Run Commands in Running Containers

09:33

–Docker Networking

46:03

Docker Network : Introduction

06:06

Explore Container Networks

11:05

Docker Network CLI : List & Inspect

06:56

Docker Network : Create, Connect & Disconnect Network

10:39

Docker Network : DNS Concept

11:17

–Docker Container Images : Beginning

43:47

What is Docker Image

05:20

Docker Hub Repository

12:20

Concept of Docker Image Layers

05:36

Docker Image Tagging

07:49

Upload Docker Image to Cloud

12:42

–Docker Container Images : Build Images

01:00:31

Dockerfile Basics

02:38

Docker File Instructions

14:18

Create Custom Docker Image

20:25

Extend Official Docker Image

10:09

Assignment : Build Docker Image

02:21

Assignment Answer : Build Docker Image

10:40

–Docker Containers : Manage Data

01:10:01

Persistent Data Problem

06:08

Persistent Data : Data Volumes

13:15

Persistent Data : Bind Mounts

11:20

Assignment : Data Volumes

02:06

Assignment Answer : Data Volumes

25:30

Assignment : Bind Mounts

00:59

Assignment Answer : Bind Mount

10:43

–Docker Compose : Multi Container Tool

42:26

Docker Compose Introduction

04:52

Docker Compose YML File

03:51

Run MYSQL & WORDPRESS via Docker Compose

15:32

Docker Compose : Build Application From Scratch

18:11

–Docker Swarm Introduction: Swarm Orchestration

59:42

Docker Swarm Introduction: Swarm Orchestration

11:58

Docker Swarm Terminology

07:06

Create Service on Docker Swarm

16:47

Create Docker Swarm Cluster

19:36

Text Direction : SetUp Docker on Swarm Docker Nodes

00:31

Busting 5 DevOps Myths

03:44

–Docker Swarm Features and Applications

48:57

Networks in Docker Swarm

13:52

Docker Swarm Traffic Management

09:31

Assignment : Deploy Multi-Node Application in Docker Swarm

08:54

Assignment Answer : Deploy Multi-Node Application in Docker Swarm

16:40

–Docker Swarm Stack Deployment : Multi Service Deployment

56:59

Docker Swarm Stacks

18:16

Docker Swarm Stack : Scale Application

14:09

Docker Swarm : Persistent Data Issue in Distributed Application

10:42

Swarm : Deploy Distributed Application

13:52

–Docker Swarm Secrets Management : Protect Sensitive Data

35:29

Docker Swarm Secrets Introduction

08:09

Create Docker Service with Secrets

11:26

Deploy Stack with Swarm Secrets

15:54

–Docker Swarm Service Management

01:00:09

ZeroDowntime Service Upgrade

18:51

HealthCheck in Docker Swarm

16:18

Container Placement in Docker Swarm

17:59

Service Constraints in YML File

07:01

–Bonus on Other Course

00:55

Bonus Lecture: Get my other courses at the maximum discount!

00:55