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External_Dependencies.md

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External Dependencies

Installation of Dependencies

Before you can build and deploy the application, you will need to install the following dependencies on your virtual machine:

Java

To install Java, run the following commands:

sudo apt-get update  
sudo apt-get install openjdk-11-jdk

Maven

To install maven, run the following commands:

sudo apt install maven

Once the command has finished executing, confirm its installation by running:

maven --v

Node.js and Angular CLI

To install Node.js and the Angular CLI, run the following commands:

sudo apt-get update  
sudo apt-get install nodejs  
npm install -g @angular/cli

After installation, verify Node.js, npm and Angular are installed by running:

node -v  
npm -v  
ng version

NVM

NVM is used to handle multiple versions of Node.js. To install NVM, run the following commands:

sudo apt-get update  
sudo apt-get install build-essential libssl-dev  
curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.1/install.sh | bash

After installation, verify that NVM is installed by running:

nvm --version

GitLab Runner

To install your own GitLab Runner instance, follow the official documentation: https://docs.gitlab.com/runner/install/
A private GitLab runner is recommended to ensure the security and reliability of your CI/CD pipeline. By using a private runner, you can have more control over the environment and resources used for your builds.
After installation, verify runner is installed by running:

gitlab-runner --version

Docker

To host your Spring Boot app using Docker, you will need to have Docker installed on your virtual machine.

Here are the steps to install Docker on Ubuntu:

  • Install the necessary packages to allow apt to use a repository over HTTPS:
sudo apt-get install -y apt-transport-https ca-certificates curl software-properties-common
  • Add the GPG key for the official Docker repository:
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
  • Add the Docker repository to apt:
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"  
sudo apt-get update
  • Install the latest version of Docker:
sudo apt-get install -y docker-ce
  • To host your Angular app , you will need to have apache installed on your VM. Install Apache by running the following command:
sudo apt-get install apache2

Set up Variables

To set up variables for your repository in your CI/CD pipeline, go to your repository settings, then CI/CD, then variables. Now add the following variables:

DEPLOY_DIR – Type: Variable – Directory to store pipeline generated artifacts
DEPLOY_HOST – Type: Variable - Hostname
DEPLOY_USER – Type: Variable - Username
DEPLOY_SSH_KEY – Type: File – Use generated Private key

Set Up SSH Registration

In deployment stage, we need a SSH key to access the VM. To set up SSH, run the following commands on your VM:

ssh-keygen -t ecdsa -f ~/.ssh/<<key-name>>
cd .ssh
cat <<key-name>>.pub >> ~/.ssh/authorized_keys
eval "$(ssh-agent -s)"
ssh-add <<absolute_path_of_priv_key>>
cat <<key-name>>

Now, copy this private key and add it to your repository’s env variable for SSH key.

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