Certificate verification failed: The certificate is NOT trusted | Jenkins installation Error Fix | Jenkins Installation on Ubuntu 18.0.4 | Jenkins Installation on Ubuntu 20.0.4

If you try to install Jenkins on Ubuntu 18.0.4/20.0.4 instance, you may experience this problem.

Running sudo apt-get update on my AWS EC2 Ubuntu 18.04.01 LTS instance fails because Certificate verification failed: The certificate is NOT trusted.

Err:6 https://pkg.jenkins.io/debian-stable binary/ Release

Certificate verification failed: The certificate is NOT trusted. The certificate chain uses expired certificate.  Could not handshake: Error in the certificate verification. [IP: 199.232.66.133 443]

Fix for the above error

You need to install certificates to overcome this error:

sudo apt install ca-certificates

sudo apt-get update

Now try installing Jenkins

sudo apt install jenkins -y

How to upload Docker Images into Azure Container Registry using Azure Pipelines | Automate Docker builds using Azure Pipelines | Upload Docker Image into Azure Container Registry (ACR)

We will learn how to build Docker image and upload the Docker images into Azure Container Registry(ACR) using Azure Build pipelines.

Pre-requisites:

1. ACR is setup in Azure cloud. (see below for the steps)

2. Already created Azure DevOps dashboard in 

https://dev.azure.com/

3. Dockerfile created along with the application source code

How to Create Azure Container Registry?

First Create Resource Group

Make sure you are login to Azure portal first.

az login

Execute below command to create a resource group in Azure portal.

az group create --name myResourceGroup --location southcentralus

Run the below command to create your own private container registry using Azure Container Registry (ACR).

az acr create --resource-group myResourceGroup --name myacrrepo31 --sku Standard --location southcentralus

You can login to Azure portal to see the ACR repo.

How to create a Azure Build Pipeline

1. Login into your Azure DevOps dashboard

2. Click on Pipelines.

3. Click on New Pipeline

4. Click on use the classic editor

Enter your repo name and branch name where you have stored your source code along with Dockerfile

Click on Continue. Now choose the template by typing Docker, Select Docker container and Apply.

 

Now pipeline is created with two tasks already. Now we need to customize it.

Let's modify Build an image task. Choose azure subscription and enter Microsoft credentials and select ACR repo from the drop down

Select Push an image task and select Azure subscription and select ACR repo from the drop down

Add a task for Copying YAML file, enter the Kubernetes deployment YAML file

Add Publish artifact task

Now click Save + Queue and run to start Building the pipeline

Once the build is completed, you should be able to see the Docker images under 

Services --> Repositories

Please watch the above steps in YouTube Channel:

Install kubectl on Mac OS | How to install kubectl in MAC OS

Kubernetes uses a command line utility called kubectl for communicating with the cluster API server. It is tool for controlling Kubernetes clusters.  

Kubectl is installable on a variety of Linux platforms, macOS and Windows.

How to install Kubectl in MAC OS

Kubectl can be installed in Mac OS by using Homebrew:

Run the update first and install

brew update && brew install kubectl 
or 
brew install kubernetes-cli

To check the version of Kubernetes CLI

kubectl version --client

=

Install Azure CLI in Mac OS| How to setup Azure CLI in Mac OS | How to Install Azure CLI in Apple Laptop

The Azure command-line interface (Azure CLI) is a set of commands used to create and manage Azure resources. The Azure CLI is available across Azure services and is designed to get you working quickly with Azure, with an emphasis on automation. Azure CLI is Microsoft's cross-platform command-line experience for managing Azure resources.

Azure CLI can be installed in Mac OS by using Homebrew:

Run the update first

brew update && brew install azure-cli

To check the version of Azure CLI

az version

Run the Azure CLI with the az command. To sign in, use the az login command.

az login

How to install Terraform on Red Hat Linux | TerraForm Installation on Red Hat Linux

Terraform is an infrastructure as a code tool used for provisioning infrastructure on most of the cloud platforms. 

• Open source
• Can setup entire infrastructure by writing Terraform scripts/templates. 
• Based on declarative model
• Uses Hashi Corp Language(HCL) which is JSON format

You can watch this on YouTube channel:

Please find steps for installing Terraform On Enterprise Red Hat Linux.

Create a working directory

sudo mkdir -p /opt/terraform

cd /opt/terraform

Install wget utility
sudo yum install wget -y

Download Terraform from Hasicorp website

sudo wget https://releases.hashicorp.com/terraform/1.0.5/terraform_1.0.5_linux_amd64.zip

Install unzip utility
sudo yum install unzip -y

Unzip Terraform Zip file
sudo unzip terraform_1.0.5_linux_amd64.zip

Add terraform to PATH
sudo mv /opt/terraform/terraform /usr/bin/

terraform -version

Terraform v1.0.5

on linux_amd64

this should show version of Terraform.

How to send approval notification from Jenkins Pipeline to Slack | Trigger Jenkins Job using Webhooks from Slack

How to integrate Slack with Jenkins using webhooks? How to send approval notification from Jenkins to Slack and approve and trigger job from Slack to Jenkins. We need to create webhooks in Slack to send messages to Slack channel.

Pre-requisites:

1. Jenkins is up and running

2. Slack account is is created and channel is created.

Steps to integrate Slack with Jenkins using Webhooks

Create Webhooks in Slack

1. Go to https://api.slack.com/ 

2. Click on Create an app

3. Select from scratch

4. Name the app and choose the workspace

Now click on incoming webhooks

Enable it by clicking on

Now select the channel where you like to post messages

Now copy the Webhook url which we will be using in Jenkins pipeline:

Now go to Jenkins and create this pipeline:

import groovy.json.JsonOutput

pipeline {

    agent any

    tools {

        maven 'Maven3'

    }

    environment {

        jenkins_server_url = "http://ec2-3-129-59-179.us-east-2.compute.amazonaws.com:8090"

        notification_channel = 'aug-2021-weekday-batch'

        slack_url = 'https://hooks.slack.com/services/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'

        

    }

   stages {

       

    stage('Cloning Git') {

            steps {

                checkout([$class: 'GitSCM', branches: [[name: '*/main']], doGenerateSubmoduleConfigurations: false, extensions: [], submoduleCfg: [], userRemoteConfigs: [[credentialsId: '8b429648-98dd-446a-80c6-120f9eab44fe', url: 'https://github.com/akannan1087/myAug21WeekendRepo']]])     

            }

        }

    stage ('Build') {

      steps {

      sh 'mvn clean install -f MyWebApp/pom.xml'

      }

    }

    stage ('DEV Deploy') {

      steps {

      echo "deploying to DEV Env "

      deploy adapters: [tomcat9(credentialsId: '341bc648-7df9-4b41-b520-9872cd2d8097', path: '', url: 'http://ec2-18-222-124-177.us-east-2.compute.amazonaws.com:8080/')], contextPath: null, war: '**/*.war'

      }

    }

    stage('QA approve') {

        steps {

          notifySlack("Do you approve QA deployment? $jenkins_server_url/job/$JOB_NAME", notification_channel, [])

            input 'Do you approve QA deployment?'

            }

        }

        

    stage ('QA Deploy') {

      steps {

      echo "deploying to QA Env "

      deploy adapters: [tomcat9(credentialsId: '341bc648-7df9-4b41-b520-9872cd2d8097', path: '', url: 'http://ec2-18-222-124-177.us-east-2.compute.amazonaws.com:8080/')], contextPath: null, war: '**/*.war'

      }

    }

    

    }

}

def notifySlack(text, channel, attachments) {

    def payload = JsonOutput.toJson([text: text,

        channel: channel,

        attachments: attachments

    ])

    sh "curl -X POST --data-urlencode \'payload=${payload}\' ${slack_url}"

}