Docker

Docker is an open platform for developing, shipping, and running applications. It enables you to separate applications from infrastructure to deliver software quickly. With Docker, you can manage your infrastructure in the same ways you manage your applications.

1. Containerization: Docker uses containerization to package software, allowing applications to run consistently across different computing environments.

2. Isolation: Each container is isolated from others, ensuring that applications do not interfere with each other.

3. Portability: Docker containers can run on any system that supports Docker, making it easy to move applications between different environments (development, testing, production).

4. Efficiency: Containers are lightweight and share the host system's OS kernel, leading to reduced overhead compared to traditional virtual machines.

5. Version Control: Docker provides version control for your containers, allowing you to track changes and roll back to previous versions if needed.

Common Use Cases for Docker

1. Microservices Architecture

   • Service Isolation: Each microservice runs in its own container, ensuring that services are isolated from one another.

   • Scalability: Easily scale individual services by running multiple instances of a container.

2. Development and Testing

   • Consistent Development Environment: Developers can work in a consistent environment, reducing the "it works on my machine" problem.

   • Automated Testing: Run tests in isolated containers to ensure tests do not affect each other.

3. Continuous Integration/Continuous Deployment (CI/CD)

   • Automated Builds and Deployments: Integrate Docker with CI/CD pipelines to automate the build, test, and deployment process.

4. Application Deployment

   • Simplified Deployment: Deploy applications as containers, ensuring consistency across development, testing, and production environments.

5. Resource Optimization

   • Efficient Use of Resources: Run multiple containers on a single host without the overhead of a full virtual machine for each application.

Installation Instructions

Windows

1. Download Docker Desktop:

   • Go to the Docker Desktop Download page and download the Docker Desktop for Windows.

2. Install Docker Desktop:

   • Run the installer and follow the on-screen instructions.

   • Once installed, open Docker Desktop from the Start menu.

3. Verify Installation:

   • Open a command prompt and run docker --version to check the installed version of Docker.

macOS

1. Download Docker Desktop:

   • Go to the Docker Desktop Download page and download the Docker Desktop for Mac.

2. Install Docker Desktop:

   • Open the downloaded .dmg file and drag the Docker icon to your Applications folder.

   • Open Docker from your Applications folder.

3. Verify Installation:

   • Open a terminal and run docker --version to check the installed version of Docker.

Linux

For Linux, the installation steps vary slightly depending on the distribution. Here’s how to install Docker on Ubuntu:

1. Update Package Information:

   sudo apt-get update

2. Install Required Packages:

   sudo apt-get install apt-transport-https ca-certificates curl software-properties-common

3. Add Docker’s GPG Key:

   curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

4. Set Up the Docker Repository:

   sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"

5. Install Docker:

   sudo apt-get update
   sudo apt-get install docker-ce

6. Verify Installation:

   • Run docker --version to check the installed version of Docker.

Docker Commands for Setting Up Databases

Microsoft SQL Server

docker run -e "ACCEPT_EULA=Y" -e "MSSQL_SA_PASSWORD=sasa@123" -p 1433:1433 --name mssql2022 --hostname mssql2022 -d mcr.microsoft.com/mssql/server:2022-latest

MySQL

docker run --name=mysql-container -e MYSQL_ROOT_PASSWORD=acesa123 -d -p 3306:3306 mysql:latest

MongoDB

docker pull mongodb/mongodb-community-server
docker run --name mongo -p 27017:27017 -d mongodb/mongodb-community-server:latest

Oracle

docker login container-registry.oracle.com
# Enter your username and auth token
docker pull container-registry.oracle.com/database/enterprise:latest

docker run -d -p 1521:1521 --name oracle container-registry.oracle.com/database/enterprise:latest
docker run -d -p 1521:1521 --name oracle -e ORACLE_SID=mydb -e ORACLE_PDB=mydbpdb1 -e ORACLE_PDB_PASSWORD=mydbpdb1 container-registry.oracle.com/database/enterprise:latest

docker run -p 1521:1521 -p 5500:5500 --name my_oracle_db -e ORACLE_SID=mydb -e ORACLE_PDB=mydbpdb1 -e ORACLE_PDB_PASSWORD=mydbpdb1 -e ORACLE_CHARACTERSET=AL32UTF8 -v /path/to/data:/opt/oracle/oradata container-registry.oracle.com/database/enterprise:latest

docker run -p 1521:1521 -p 5500:5500 --name oracle-xe -e ORACLE_PWD=acesa123 oracle/database:18.4.0-xe

RabbitMQ

docker run -d --name rabbitmq -p 5672:5672 -p 15672:15672 rabbitmq:management

Docker is a powerful tool that revolutionizes the way applications are developed, deployed, and run. It simplifies the process of managing dependencies, ensures consistency across environments, and enhances the scalability and efficiency of applications.