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DevOps : The Next Big Game Changer

If you’re a hard core techie, and stay updated with current trends in the IT world, chances are that you’ve already heard of the term DevOps. But just what is it all about, anyway, and why is it touted to be the next big game changer? DevOps is a movement that has been brought about in the software industry by people who think it’s high time there is a change. For too many years now, it has been tacitly understood that if you are working on a software project, it is bound to run late, exceed the budget, and underperform. A sorry state of affairs indeed, but yes, this is the way things have been! So we have had these all-too familiar situations outlined below: No one is confident whether the software will actually work when deployed Problems manifest the moment the site goes live It is very hard or impossible to change an application, once delivered Teams tend to ‘pass the buck’- developers blame testers, who blame release managers. And so on, and so forth. We’ve all been there, and done that. But there are some folks who actually decided to do something about this situation. And that’s how the concept of DevOps was born. The DevOps movement was started by some people who believed that by combining technology and changing the attitude of teams, software development and delivery can be revolutionized. “DevOps” is a portmanteau of ‘development’ and ‘operations’, with the buzzwords being communication, collaboration, integration, automation and cooperation. The DevOps approach clearly is a win-win situation, and is an understanding of how collaboration between developers and operations staff can create value at all stages of the product lifecycle. DevOps leans toward extending basic Agile and Lean principles, in a manner that includes the overall services, including systems and operations. In the DevOps world of the future, the paradigm has shifted and boundaries have blurred. Will this movement catch on? Let’s wait and watch.  

DevOps : The Next Big Game Changer

571
DevOps : The Next Big Game Changer

If you’re a hard core techie, and stay updated with current trends in the IT world, chances are that you’ve already heard of the term DevOps. But just what is it all about, anyway, and why is it touted to be the next big game changer?

DevOps is a movement that has been brought about in the software industry by people who think it’s high time there is a change. For too many years now, it has been tacitly understood that if you are working on a software project, it is bound to run late, exceed the budget, and underperform. A sorry state of affairs indeed, but yes, this is the way things have been!

So we have had these all-too familiar situations outlined below:

  • No one is confident whether the software will actually work when deployed
  • Problems manifest the moment the site goes live
  • It is very hard or impossible to change an application, once delivered
  • Teams tend to ‘pass the buck’- developers blame testers, who blame release managers. And so on, and so forth.

We’ve all been there, and done that. But there are some folks who actually decided to do something about this situation. And that’s how the concept of DevOps was born.

The DevOps movement was started by some people who believed that by combining technology and changing the attitude of teams, software development and delivery can be revolutionized. “DevOps” is a portmanteau of ‘development’ and ‘operations’, with the buzzwords being communication, collaboration, integration, automation and cooperation.

The DevOps approach clearly is a win-win situation, and is an understanding of how collaboration between developers and operations staff can create value at all stages of the product lifecycle. DevOps leans toward extending basic Agile and Lean principles, in a manner that includes the overall services, including systems and operations.

In the DevOps world of the future, the paradigm has shifted and boundaries have blurred. Will this movement catch on? Let’s wait and watch.

 

Usha

Usha Sunil

Blog Author

Writing is Usha's hobby and passion. She has written widely on topics as diverse as training, finance, HR and marketing, and is now into technical writing and education. She keeps an interested eye on new trends in technology, and is currently on a mission to find out what makes the world go around.

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1 comments

Shraddha Sunil 17 Jun 2016

Great article!

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How to Install Docker on Ubuntu

Docker is a platform that packages the application and all its dependencies in the container so that the application works seamlessly. The Container makes the application run its resource in an isolated process similar to the virtual machines, but it is more portable. For a detailed introduction to the different components of a Docker container, you can check out Introduction to Docker, Docker Containers & Docker Hub This tutorial covers the installation and use of Docker Community Edition (CE) on an Ubuntu 20.04 machine. Pre-requisitesAudienceThis tutorial is meant for those who are interested in learning Docker as a container service System Requirements Ubuntu 20.04 64-bit operating system. (If Linux OS is not in system, we can run docker using Virtual Box, PFB the steps) A user account with sudo privileges An account on Docker Hub to pull or push an image from Hub. Ubuntu Installation on Oracle Virtual Box If you want to use Ubuntu 20.04 without making any change to the Windows Operating system, you can proceed with the Oracle Virtual box.  Virtual Box is free and open-source virtualization software from Oracle. It enables you to install other operating systems in virtual machines. It is recommended that the system should have at least 4GB of RAM to get decent performances from the virtual operating system. Below are the steps for downloading Ubuntu 20.04 on Oracle Virtual box:Navigate to the website of Oracle Virtual Box, download the .exe file and get the latest stable version. 1. Once done with downloading the virtual box, we can navigate to and download the  Ubuntu disk image (.iso file) by clicking on the download option 2. Once the download has been completed for Ubuntu .iso file, open the virtual box and click on "New" present on top.  3. Enter the details of your virtual machine by giving any name, type as "Linux " and Version as Ubuntu (64 bit)  4. Choose the memory (RAM ) that needs to be allocated to the Virtual machine  and click on Next. (I have chosen 3000 MB) 5. After the RAM allocation ,Click on  Create a virtual disk now. This serves as the hard disk of the virtual Linux system. It is where the virtual system will store its files 6. Now, we want to select the Virtual Hard Disk.  7. We can choose either the “Dynamically allocated” or the “Fixed size” option for creating the virtual hard disk. 8. Finally, we have  to specify our Ubuntu OS's size. The recommended size is 10 GB, but it  can be increased if required.8. Finally, we have  to specify our Ubuntu OS's size. The recommended size is 10 GB, but it  can be increased if required.9. Ubuntu OS is ready to install in Virtual Box, but before starting the Virtual system, we need to a make few changes in settings. Click on storage under the setting.  10. Click on Empty under Controller IDE. Navigate to Attributes and browse the Optical Drive option. 11. Choose the .iso file from the location where it is downloaded. Once selected, click on OK and start the Virtual box by clicking on start present on the Top menu.12. Click ok and start the machine. 13. Proceed with "Install Ubuntu" 14. Under "Updates and other software" section, check "Normal installation", and the two options under “Other options” and continue.15. In Installation type, check Erase disk and install Ubuntu.16. Choose your current location and set up your profile. Click Continue.  17. It may take 10-15 minutes to complete the installation 18. Once the installation finishes, restart the virtual systemWe are done with pre-request, and can now proceed with using this Ubuntu. Docker Installation Process on Ubuntu  Method 1: Install Docker on Ubuntu Using Default Repositories One of the easiest ways is the installation of Docker from the standard Ubuntu 20.04 repositories, but It’s possible that the Ubuntu default repositories have not updated to the latest revision of Docker. It happens because in some cases Docker is not supporting that particular Ubuntu version. Therefore, there can be a scenario where  Ubuntu default repositories have not updated to the latest version. Log in to Virtual Box. Run “docker” as command to check if it is previously installed.To install Docker on Ubuntu box, first update the packages. It will ask for a password. Enter it and allow the system to complete the updates.sudo apt updateTo install Docker from Ubuntu default repositories, use the below command: sudo apt install docker.io To check the installed version, use the below: docker --version Since discussed above, it has installed the 19.03.8 version of docker whereas the latest version is 20.04  Method 2: Install Docker from Official Repository For installing docker on ubuntu 20.04 with the latest version, we’ll proceed with enabling the Docker repository, importing the repository GPG key, and finally installing the package. To install the docker on Ubuntu box, update your existing list of packages. It will ask for a password. Enter it and allow the system to complete the updates. sudo apt update  We need to install a few prerequisite packages to add HTTPS repository : sudo apt install apt-transport-https ca-certificates curl software-properties-common Import the repository’s GPG key using the following curl command: curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add - Add the Docker APT repository to the system sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"Again, update the package database with the Docker packages sudo apt update Finally, install Docker using below command: sudo apt install docker-ce To check the installed version use below: docker --versionTo start, enable and check the status of docker, use below command: sudo systemctl  status docker  sudo systemctl  start  docker  sudo systemctl  enable  docker To check system wide information regarding docker installation, we use the command “docker info”. Information that is shown includes the kernel version, number of containers and unique images. The output will contain details as given below, depending upon the daemon running: Source:$ docker info  Client:   Context:    default   Debug Mode: true  Server:   Containers: 14    Running: 3    Paused: 1    Stopped: 10   Images: 52   Server Version: 1.13.0   Storage Driver: overlay2    Backing Filesystem: extfs    Supports d_type: true    Native Overlay Diff: false   Logging Driver: json-file   Cgroup Driver: cgroupfs   Plugins:    Volume: local    Network: bridge host macvlan null overlay   Swarm: active    NodeID: rdjq45w1op418waxlairloqbm    Is Manager: true    ClusterID: te8kdyw33n36fqiz74bfjeixd    Managers: 1    Nodes: 2    Orchestration:     Task History Retention Limit: 5    Raft:     Snapshot Interval: 10000     Number of Old Snapshots to Retain: 0     Heartbeat Tick: 1     Election Tick: 3    Dispatcher:     Heartbeat Period: 5 seconds    CA Configuration:     Expiry Duration: 3 months    Root Rotation In Progress: false    Node Address: 172.16.66.128 172.16.66.129    Manager Addresses:     172.16.66.128:2477   Runtimes: runc   Default Runtime: runc   Init Binary: docker-init   containerd version: 8517738ba4b82aff5662c97ca4627e7e4d03b531   runc version: ac031b5bf1cc92239461125f4c1ffb760522bbf2   init version: N/A (expected: v0.13.0)   Security Options:    apparmor    seccomp     Profile: default   Kernel Version: 4.4.0-31-generic   Operating System: Ubuntu 16.04.1 LTS   OSType: linux   Architecture: x86_64   CPUs: 2   Total Memory: 1.937 GiB   Name: ubuntu   ID: H52R:7ZR6:EIIA:76JG:ORIY:BVKF:GSFU:HNPG:B5MK:APSC:SZ3Q:N326   Docker Root Dir: /var/lib/docker   Debug Mode: true    File Descriptors: 30    Goroutines: 123    System Time: 2016-11-12T17:24:37.955404361-08:00    EventsListeners: 0   Http Proxy: http://test:test@proxy.example.com:8080   Https Proxy: https://test:test@proxy.example.com:8080   No Proxy: localhost,127.0.0.1,docker-registry.somecorporation.com   Registry: https://index.docker.io/v1/   WARNING: No swap limit support   Labels:    storage=ssd    staging=true   Experimental: false   Insecure Registries:    127.0.0.0/8   Registry Mirrors:     http://192.168.1.2/     http://registry-mirror.example.com:5000/   Live Restore Enabled: false Note: In case you get below error after running “docker info” command, one way is to add sudo in front and run the command, OR you can refer to the same error-resolving steps mentioned under Running Docker Images section. Running Docker Images and Verifying the process: To check whether you can access and download the images from Docker Hub, run the following command: sudo docker run hello-worldIn case of errors received after running the docker run command, you can correct it using the following steps, otherwise proceed with the next step of checking the image. ERROR: docker: Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Post http://%2Fvar%2Frun%2Fdocker.sock/v1.35/containers/create: dial unix /var/run/docker.sock: connect: permission denied. See 'docker run --help'.   Create the docker group if it does not exist sudo groupadd docker Add your user to the docker group.   sudo usermod -aG docker $USER   Eg:- sudo usermod -aG docker kanav Run the following command or Logout and login again and run ( if that doesn't work you may need to reboot your machine first)  newgrp docker Check if docker can be run without root docker run hello-world If the problem still continues, try to reboot it and run the command. To check the image, use this command: sudo docker images Uninstall Procedure: Below are the common commands used to remove images and containers: sudo  apt-get  purge docker-ce docker-ce-cli containerd.io To completely uninstall Docker, use below: To identify what are the installed packages, this is the command: dpkg -l | grep -i dockersudo apt-get purge -y docker-engine docker docker.io docker-ce docker-ce-cli  sudo apt-get autoremove -y --purge docker-engine docker docker.io docker-ce   To remove images, containers, volumes, or user created configuration files, these commands can be used: sudo rm -rf /var/lib/docker /etc/docker sudo rm /etc/apparmor.d/docker sudo groupdel docker sudo rm -rf /var/run/docker.sock  Conclusion: If you found this Install Docker on Ubuntu blog relevant and useful, do check out the Docker-Training workshop from KnowledgeHut, where you can get equipped with all the basic and advanced concepts of Docker! 
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How to Install Docker on Ubuntu

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How to Install Kubernetes on Windows

Kubernetes is a container-based platform for managing cloud resources and developing scalable apps. It is widely regarded as the most common platform for automating, deploying, and scaling the entire cloud infrastructure. The platform runs on all major operating systems and is the most widely used open-source cloud tool.  Kubernetes can scale your entire infrastructure, monitor each service's health, act as a load balancer, and automate deployments, among other things. You can deploy your pods (docker containers) and services across the cloud by installing and configuring as many nodes (clusters) as you want.Let’s get started. We will guide you through the complete roadmap on how to install Kubernetes for Windows users. This tutorial will show you how to set up Kubernetes and deploy the official web GUI dashboard, which will allow you to manage and monitor everything. PrerequisitesFor installing Kubernetes in your system, here are a few prerequisites that need special attention. The hardware and software requirements are discussed below:Hardware requirementsMaster node with at least 2 GB memory. (Additional will be great)Worker node with 700 MB memory capacity.Your Mouse/Keyboard (monitor navigation)Software requirementsHype-VDocker DesktopUnique MAC addressUnique product UUID for every nodeEnsuring that there is a full range of connectivity between all the machines in the cluster is a must.Installation ProcedureStep 1: Install & Setup Hyper-VAs we all know, Windows has its virtualization software, known as Hyper-V, which is essentially VirtualBox on steroids. Hyper-V allows you to manage your virtual machines (VMs) using either the free Microsoft GUI tool or the command line. It's simple to enable Hyper-V, but first, make sure your PC meets the following requirements:Your operating system should be Windows 10 (Enterprise, Pro, or Education), withAt least 4GB of RAM and CPU Virtualization support, though you should double-check that it's turned on in your BIOS settings.You can disable or enable features like Hyper-V that may not be pre-installed when Windows is installed. Always keep in mind that some of the features require internet access to download additional Windows Update components.To enable Hyper-V on your machine, follow the steps below:1. Open the Control Panel.2. Select Programs from the left panel.3. Next, go to Programs and Features, then Turn Windows Features On or Off.4. Examine Hyper-V and the Hypervisor Platform for Windows.5. Select OK.Your system will now begin installing Hyper-V in the background; it may be necessary to reboot a few times until everything is properly configured. Don't hold your breath for a notification or anything! Verify that Hyper-V is installed successfully on your machine by running the following command as Administrator in PowerShell:Get-WindowsOptionalFeature -Online -FeatureName Microsoft-Hyper-VOnce the state is shown as Enabled for above command in Power shell, we are good to go.Step 2: Download Docker for Windows and install it.Kubernetes is a container orchestration system built on top of Docker. It is essentially just a tool for communicating with Docker containers and managing everything at an enterprise level. Simply go to install Docker and click to Get Docker Desktop for Windows (stable).Windows users can use Docker Desktop.Docker Desktop for Windows is a version of Docker optimized for Windows 10. It's a native Windows application that makes developing, shipping, and running dockerized apps simple. Docker Desktop for Windows is the fastest and most reliable way to develop Docker apps on Windows, as it uses Windows-native Hyper-V virtualization and networking. Docker Desktop for Windows can run Docker containers on both Linux and Windows.Installation of Docker DesktopLet us take a look on the different steps involved in installing docker desktop.Double-click Docker for Windows Installer to run the installer.Docker starts automatically once the installation is complete. Docker is running and accessible from a terminal, as indicated by the whale in the notification area.Run Try out some Docker commands in a command-line terminal like PowerShell!  Run the Docker version to check the version.Run Docker run hello-world to verify that Docker can pull and run images.Boom!As long as the Docker Desktop for Windows app is running, Docker is accessible from any terminal. The Docker whale in the taskbar has a setting button that can be accessed from the UI.For a detailed step by step installation guide with screenshot, visit the blog - How to Install Docker on Windows, Mac, & Linux: A Step-By-Step GuideWARNING: FOLLOW THE INSTRUCTIONS BELOW! If Docker was successfully installed but you can't find its tray icon, you'll need to restart your computer. Check the official troubleshooting guide here if the issue persists. Step 3: Install Kubernetes on Windows 10Docker includes a graphical user interface (GUI) tool that allows you to change some settings or install and enable Kubernetes.To install Kubernetes, simply follow the on-screen instructions on the screen:1. Right-click the Docker tray icon and select Properties.2. Select "Settings" from the drop-down menu.3. Select "Kubernetes" from the left panel.4. Check Enable Kubernetes and click "Apply"Docker will install additional packages and dependencies during the installation process. It may take between 5 and 10 minutes to install, depending on your Internet speed and PC performance. Wait until the message 'Installation complete!' appears on the screen. The Docker app can be used after Kubernetes has been installed to ensure that everything is working properly. Both icons at the bottom left will turn green if both services (Docker and Kubernetes) are running successfully and without errors.Example.Step 4: Install Kubernetes DashboardThe official web-based UI for managing Kubernetes resources is Kubernetes Dashboard. It isn't set up by default. Kubernetes applications can be easily deployed using the cli tool kubectl, which allows you to interact with your cloud and manage your Pods, Nodes, and Clusters. You can easily create or update Kubernetes resources by passing the apply argument followed by your YAML configuration file.Use the following commands to deploy and enable the Kubernetes Dashboard.1. Get the yaml configuration file from here.2. Use this to deploy it. kubectl apply -f .\recommended.yaml3. Run the following command to see if it's up and running.:kubectl.exe get -f .\recommended.yaml.txtStep 5: Access the dashboardThe dashboard can be accessed with tokens in two ways: the first is by using the default token created during Kubernetes installation, and the second (more secure) method is by creating users, giving them permissions, and then receiving the generated token. We'll go with the first option for the sake of simplicity.1. Run the following command PowerShell (not cmd)((kubectl -n kube-system describe secret default | Select-String "token:") -split " +")[1]2. Copy the generated token3. Runkubectl proxy.4. Open the following link on your browser: http://localhost:8001/api/v1/namespaces/kubernetes-dashboard/services/https:kubernetes-dashboard:/proxy/5. SelectToken & paste the generated token6. Sign InFinallyYou'll be able to see the dashboard and your cloud resources if everything is set up correctly. You can then do almost all of the "hard" work without having to deal with the CLI every time. You may occasionally get your hands dirty with the command line, but if you don't understand Docker and Kubernetes or don't have the time to manage your own cloud, it's better to stick with some PaaS providers that can be quite expensive.Kubernetes Uninstallation ProcessThe procedures for uninstalling cert-manager on Kubernetes are outlined below. Depending on which method you used to install cert-manager - static manifests or helm - you have two options.Warning: To uninstall cert-maneger, follow the same steps as you did to install it, but in reverse. Whether cert-manager was installed from static manifests or helm, deviating from the following process can result in issues and potentially broken states. To avoid this, make sure you follow the steps outlined below when uninstalling.Step 1: Before continuing, make sure that all user-created cert-manager resources have been deleted. You can check for any existing resources with the following command:$ kubectl get Issuers,ClusterIssuers,Certificates,CertificateRequests,Orders,Challenges --all-namespacesAfter you've deleted all of these resources, you can uninstall cert-manager by following the steps outlined in the installation guide.Step 2: Using regular manifests to uninstall.Uninstalling from a regular manifest installation is as simple as reversing the installation process and using the delete command.kubectl.2. Delete the installation manifests using a link to your currently running version vX.Y. Z like so:$ kubectl delete -f https://github.com/jetstack/cert-manager/releases/download/vX.Y.Z/cert-manager.yamlStep 3: Uninstalling with Helm.1. Uninstalling cert-manager from a Helm installation is as simple as reversing the installation process and using the delete command on both the server and the client. kubectl and helm.$ helm --namespace cert-manager delete cert-manager2. Next, delete the cert-manager namespace:$ kubectl delete namespace cert-manager3. Finally, delete the cert-manger CustomResourceDefinitions using the link to the version vX.Y.Z you installed:$ kubectl delete -f https://github.com/jetstack/cert-manager/releases/download/vX.Y.Z/cert-manager.crds.yamlThe namespace is in the process of being terminated.The namespace may become stuck in a terminating state if it is marked for deletion without first deleting the cert-manager installation. This is usually because the APIService resource is still present, but the webhook is no longer active and thus no longer reachable.4. To fix this, make sure you ran the above commands correctly, and if you're still having problems, run:$ kubectl delete apiservice v1beta1.ConclusionIn this tutorial, we have explained in detail how to install Kubernetes with Hyper-V. Also, we have tackled what requirements we need, both in terms of the software and hardware. We have explained how to install Hyper-V and Docker on Windows 10.   It is important to note that the fundamental difference between Kubernetes and Docker is that Kubernetes is meant to run across a cluster and Docker is meant to run through nodes.   Kubernetes is also more extensive than Docker Swarm and is meant to coordinate a cluster of nodes at scale in production in an efficient manner. Each software is crucial to having a smooth installation process.   We finally looked at how to install and uninstall Kubernetes.
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How to Install Kubernetes on Windows

Kubernetes is a container-based platform for manag... Read More

How To Install Jenkins on Ubuntu

Jenkins is a Java-built open-source Continuous Integration (CI) and CD platform. Basically, Jenkins builds software projects, checks and deploys them. This is one of the most practical programming tools you can master, and today we will show you how Jenkins is installed on Ubuntu 18.04. Use this powerful tool to activate your VPS server!Jenkins is loved by teams of all sizes, for different language projects like Java, Ruby, Dot Net, PHP etc. Jenkins is a platform that is autonomous, and can be used on Windows, Linux or any other operating system.  Prerequisites Hardware Requirements: RAM- 4 GB (Recommended) Storage- more than 50 GB of Hard Disk Space (Recommended)        Software Requirements: Java: Java Development Kit (JDK) or Java Runtime Environment (JRE).  Web Browser: Any browser such as Google Chrome, Mozilla Firefox, Microsoft Edge. Operating System: An Ubuntu 18.04 server installed with a non-root sudo user and firewall. For help in the planning of production capability of a Jenkins installation see Choosing the right hardware for Masters. Why Use Jenkins? You need to consider continuous integration (CI) and continuous delivery (CD) to understand Jenkins: Continuous integration – the practice of continuous production combined with the main industry.  Continuous delivery – the code is constantly delivered to an area after the code is ready for delivery. It could be for production or staging. The commodity is supplied to a consumer base that can provide QA or inspection by customers. Developers update the code regularly in the shared repository (such as GitHub or TFS). Improvements made in the source code are made at the end of the day, making it difficult to identify the errors. So, Jenkins is used here. Once a developer changes the repository, Jenkins will automatically enable the build and immediately warn you in the event of an error (Continuous Integration CI). Installation Procedure: Step 1: Install Java Skip to the next section if you have Java already installed on your system. To check, please run the following command in the terminal: java --version Jenkins needs Java for running, but it doesn't include certain distributions by default, and Java versions of Jenkins are incompatible. Multiple Java implementations are available to you. OpenJDK is currently the most popular one, which we will use in this guide. Being an open-source Java application, Jenkins requires the installation of OpenJDK 8 on your system. The apt repositories can directly access OpenJDK 8. The installation of OpenJDK from standard repositories is recommended. Open and enter the following in the terminal window: $ sudo apt update  $ sudo apt install openjdk-8-jdk The download and installation will be requested. Press the "Y" button and press the Enter button to finish the process. Java 8 will be installed on your system. We are ready to download Jenkins package now as we have our requirements ready! Step 2: Install Jenkins The default Ubuntu packages for Jenkins are always behind the current version of the project itself. You may use the project-maintained packages to install Jenkins to take advantage of the newest patches and features. 1. add the framework repository key: $ wget -q -O - https://pkg.jenkins.io/debian-stable/jenkins.io.key | sudo apt-key add  The device returns OK when the key is inserted. 2. Next, link the repository of Debian packages to the sources.list of the server: $ sudo sh -c 'echo deb http://pkg.jenkins.io/debian-stable binary/ > /etc/apt/sources.list.d/jenkins.list' 3. When both are in place, upgrade to apt to use the new repository: $ sudo apt update 4. Install Jenkins: $ sudo apt install jenkins Now we're going to start the Jenkins server, as Jenkins and its dependencies are in place. Step 3: Start Jenkins 1. You can start Jenkins using systemctl: $ sudo systemctl start jenkins 2. As systemctl does not display performance, you can use the status command to check that Jenkins has successfully launched: $ sudo systemctl status jenkinsIf all went well, the start of the performance should demonstrate that the service is active and ready to boot: Output: jenkins.service - LSB: Start Jenkins at boot time     Loaded: loaded (/etc/init.d/jenkins; generated)     Active: active (exited) since Sat 2021-04-17 00:34:17 IST; 26s ago       Docs: man:systemd-sysv-generator(8)    Process: 17609 ExecStart=/etc/init.d/jenkins start (code=exited, status=0/SUCC As Jenkins is running, so adjust the firewall rules to complete our further setup of Jenkins from the web browser. Step 4: Opening the Firewall 1. Jenkins works by default on port 8080, so let's open the port with ufw: $ sudo ufw allow 8080  2. Check ufw’s status: $ sudo ufw status You will see that traffic from anywhere is permitted to port 8080. Output: Status: active  To                         Action      From  --                         ------      ----  8000                       ALLOW       Anywhere                    CUPS                       ALLOW       Anywhere                    27017                      ALLOW       Anywhere                    27017                      ALLOW       192.168.1.10                8080                       ALLOW       Anywhere                    8000 (v6)                  ALLOW       Anywhere (v6)               CUPS (v6)                  ALLOW       Anywhere (v6)               27017 (v6)                 ALLOW       Anywhere (v6)               8080 (v6)                  ALLOW       Anywhere (v6) 3. If the firewall is inactive, the following commands will allow OpenSSH and turn it back on: $ sudo ufw allow OpenSSH  $ sudo ufw enable We can finish the initial configuration with Jenkins installed and our firewall configured. Note: If you decide to continue to use Jenkins, use a Nginx Reverse Proxy at Ubuntu 18.04 to configure Jenkins with SSL when your exploration has been completed to protect your passwords and any sensitive system or product information sent between the machine and the server in plain text. Step 5: Setting Up Jenkins 1. To set up installation, visit Jenkins on its default 8080 port with your server domain name or IP address: http://your_server_ip_or_domain:8080 You should see the Unlock Jenkins screen, which displays the initial password's location:2. You can use the cat command to display the password: $ sudo cat /var/lib/jenkins/secrets/initialAdminPassword 3. Copy the alphanumeric terminal 32-character password and paste into the Administrator Password field, then click Continue. Output: 0aaaf00d9afe48e5b7f2a494d1881326 The following screen shows the ability to install or select certain plugins: 4. We will click on the option to install proposed plugins to start the installation process immediately. 5. When the installation is done, the first administrative user will be prompted. You can save this step and use your initial password to continue as an Admin. However, we will take some time to create the user. The Jenkins default server is NOT encrypted to prevent data from being protected. Use the Nginx Reverse Proxy on Ubuntu 18.04 to configure Jenkins with SSL. This protects the information of users and builds transmitted through the web interface. 6. You will see a configuration instance page, which asks you to confirm your Jenkins instance's URL of choice. Confirm either your server's domain name or the IP address of your server.  7. Click Save and Finish once you have confirmed the relevant information. A confirmation page will show you that "Jenkins is ready!"  Hit Start using Jenkins button and it will take you to the Jenkins dashboard.  Congratulations! You have completed the installation of Jenkins. Step 6: Creation of New Build Jobs in Jenkins: The freestyle job is a highly versatile and user-friendly choice. It's easy to set up and many of its options appear in many other build jobs. For all projects, you can use it. Follow the following steps: You have to login to your Jenkins Dashboard by visiting2) Create New item: Click on the New Item on the left-hand side of the dashboard.3) Fill the project description: You can enter the job details as per your need.4) Source Code Management: Under source code management, enter the repository URL.You can also use a Local repository. 5) Build Environment: Now in the Build section, Click on the “Add build Setup” Select "Execute Windows batch command".Now, add the java commands. In this article, we have used javac HelloWorld.java and java HelloWorld.   6) Save the project: Click Apply and save the project. 7) Build Source Code and check its status: Click on “Build Now” on the left-hand side of the screen to create the source code. 8) Console Output: Select the build number and click on “Console Output” to check the status of the build run. When it shows success, it means that we have successfully run the HelloWorld program from the cGitHub Repository. In case of failure, you can check the job logs by clicking on failure icon and debug the root cause.Uninstall Jenkins Follow the instructions to uninstall Jenkins: $ sudo apt-get remove jenkins Uninstall Jenkins: $ sudo apt-get remove --auto-remove jenkins Purging your data: $ sudo apt-get purge jenkins or you can use: $ sudo apt-get purge --auto-remove jenkins Conclusion: Installing Jenkins on Ubuntu is really that easy. Jenkins has a low learning curve and so you can start to work with it as quickly as possible. In the above article we have learned how to install Jenkins in an Ubuntu machine where all the steps are explained clearly. In case you want to learn more about the core concepts of Jenkins Jobs, Pipelines, Distributed System, Plugins, and how to use Jenkins in depth you can enroll for our course Jenkins Certification Course. 
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How To Install Jenkins on Ubuntu

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