Prerequisites Installation for the Microservices Class

0. Demo

The VM is provided for every student.
The VM has everything needed for the class labs.
The following is for reference purposes only.

1. Verify Java

java -version

OpenJDK Runtime Environment Corretto-17.0.11.9.1

If not there, install Java JDK 17

Download:
- Visit the Oracle JDK 17 download page or install OpenJDK 17 from AdoptOpenJDK.
Installation:
- Windows: Run the downloaded installer and follow the setup instructions.
- macOS: Open the .dmg file and drag the JDK package to the Applications folder.
- Linux: Use your package manager:
```
sudo apt update
sudo apt install openjdk-17-jdk
```
Set JAVA_HOME:
- Windows:
  1. Open Environment Variables (System Properties > Advanced > Environment Variables).
  2. Add a new system variable with Name: JAVA_HOME and Value as the JDK installation path.
- macOS/Linux:
  - Add the following to your shell configuration file (~/.bashrc, ~/.zshrc, etc.):
```
export JAVA_HOME=/usr/lib/jvm/java-17-openjdk
export PATH=$JAVA_HOME/bin:$PATH
```
  - Run source ~/.bashrc or source ~/.zshrc to apply changes.
Verify Installation:
```
java -version
```

2. Install MySQL

Download and Install

Download MySQL from MySQL Downloads and follow the instructions for your operating system:
- Windows/macOS: Run the installer and set up a root password.
- Linux:
```
sudo apt update
sudo apt install mysql-server
```

Secure Installation (Linux only)

Run the following command and follow the prompts to set the root password and secure MySQL:
```
sudo mysql_secure_installation
```

Start MySQL Service

Windows: MySQL typically starts automatically. Use Services to manage.
macOS: Use System Preferences or run:
```
brew services start mysql
```
Linux:
```
sudo systemctl start mysql
```

Verify MySQL Access

Open a terminal and enter:
```
mysql -u root -p
```
When prompted, enter the password you set for the root user.

3. Install Docker

Download and Install Docker Desktop

Download Docker Desktop for your operating system from Docker’s website.
Follow the installation instructions:
- Windows/macOS: Run the installer and start Docker Desktop.
- Linux:
```
sudo apt update
sudo apt install docker.io
```

Configure Docker (Linux only)

Add your user to the Docker group to run Docker without sudo:
```
sudo usermod -aG docker $USER
```
Log out and log back in to apply the change.

Verify Docker Installation

Open a terminal and enter:
```
docker --version
```
You should see output like Docker version x.xx.x, confirming Docker is installed.