[Devops] Jenkins Installation

Guide ## Prerequisites

Update Packages

$ sudo apt-get update
$ sudo apt-get install -y \
ca-certificates \
curl \
gnupg \
lsb-release

Install JavaDK11

sudo apt search openjdk
sudo apt install openjdk-11-jdk
java -version

Install Jenkins

wget -q -O - https://pkg.jenkins.io/debian-stable/jenkins.io.key | sudo apt-key add -
sudo sh -c 'echo deb https://pkg.jenkins.io/debian-stable binary/ > /etc/apt/sources.list.d/jenkins.list'
sudo apt-get update
sudo apt-get install jenkins -y

Generate Initial Password Jenkins

sudo cat /var/lib/jenkins/secrets/initialAdminPassword

Init Credential

Username : admin
Password : initialAdminPassowrd

Access

http://your_ip:8080

Reverse Proxy to 443

• Generate SSL

apt install -y certbot
certbot certonly

• Install Nginx

apt update -y
apt install -y nginx
nano /etc/nginx/conf.d/jenkins.conf

upstream jenkins {
  keepalive 32; # keepalive connections
  server jenkins_vm_ip:8080; # jenkins ip and port
}

# Required for Jenkins websocket agents
map $http_upgrade $connection_upgrade {
  default upgrade;
  '' close;
}

server {
    listen 443;
    server_name jenkins.lab.id;
    ssl_certificate /etc/letsencrypt/live/jenkins.lab.id/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/jenkins.lab.id/privkey.pem;

  # pass through headers from Jenkins that Nginx considers invalid
  ignore_invalid_headers off;

  location / {
      sendfile off;
      proxy_pass         http://jenkins;
      proxy_redirect     default;
      proxy_http_version 1.1;

      # Required for Jenkins websocket agents
      proxy_set_header   Connection        $connection_upgrade;
      proxy_set_header   Upgrade           $http_upgrade;

      proxy_set_header   Host              $host;
      proxy_set_header   X-Real-IP         $remote_addr;
      proxy_set_header   X-Forwarded-For   $proxy_add_x_forwarded_for;
      proxy_set_header   X-Forwarded-Proto $scheme;
      proxy_max_temp_file_size 0;

      #this is the maximum upload size
      client_max_body_size       10m;
      client_body_buffer_size    128k;

      proxy_connect_timeout      90;
      proxy_send_timeout         90;
      proxy_read_timeout         90;
      proxy_buffering            off;
      proxy_request_buffering    off; # Required for HTTP CLI commands
      proxy_set_header Connection ""; # Clear for keepalive
  }

}

service nginx reload

Flow

Scenario

• Creata sample app web.
• Github Repo integrate with Jenkins.

Create Web Apps on Repository

Repository : jenkins-argo

• Create Credentials

• Create Job Pipelines

  • Pipeline Name : pipeline-demo
  • Pipeline Script from SCM : Git
  • Git Repo : https://github.com/rjhaikal/webpage
  • Credentials : rjhaikal/**(dockerhub)
  • Branch : /master
  • Script Path : Jenkinsfile

Build the Pipeline

Run Build now. Pipeline has build and successfully run, on the docker repository now has tags 1 and tags latest.