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Install Jenkins on Ubuntu 20.04 - Step by Step Process ?

This article covers how you can install Jenkins on Ubuntu OS. For further information about Jenkins, visit its official documentation.

Jenkins is an open-source automation server that can be used to easily set up continuous integration and continuous delivery (CI/CD) pipelines.

Continuous integration (CI) is a DevOps practice in which team members regularly commit their code changes to the version control repository, after which automated builds and tests are run. 

Continuous delivery (CD) is a series of practices where code changes are automatically built, tested, and deployed to production.


To install Jenkins on Ubuntu 20.04 as a standalone service:

1. Run the following commands as root or user with sudo privileges or root to install OpenJDK 11:

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

2. Once the installation is complete, verify it by checking the Java version:

# java -version

3. Import the GPG keys of the Jenkins repository using the following wget command:

# wget -q -O - https://pkg.jenkins.io/debian/jenkins.io.key | sudo apt-key add -

4. Next, add the Jenkins repository to the system with:

# sudo sh -c 'echo deb http://pkg.jenkins.io/debian-stable binary/ > /etc/apt/sources.list.d/jenkins.list'

5. Once the Jenkins repository is enabled, update the apt package list and install the latest version of Jenkins by typing:

# sudo apt update
# sudo apt install jenkins

6. Jenkins service will automatically start after the installation process is complete. You can verify it by printing the service status:

# systemctl status jenkins


Install and Use Docker Compose on CentOS 8 - Step by Step Process ?

This article covers how to install and use the Docker-compose on CentOS 8 system. By using the Docker-compose, you can deploy multiple Docker applications with container services through a single command. 

Basically, Docker Compose is a tool that can be used to define and run multiple containers as a single service. With Docker Compose, you can link multiple containers and deploy an application from a single command. 

It is mainly used in the development, testing and staging environment. 

Docker Compose uses a YAML file to define a complex stack in a file and running it with a single command.


To install Docker on CentOS:

1. Before starting, make sure you have Docker installed on your server. If not installed, you will need to add Docker-CE repository to your system. 

You can add it with the following command:

$ dnf config-manager --add-repo=https://download.docker.com/linux/centos/docker-ce.repo

2. Once the repository is added, install the latest version of docker using the following command:

# dnf install docker-ce --nobest -y
# systemctl start docker
# systemctl enable docker

3. You can verify the docker version with the following command:

$ docker --version


Install Python 3.9 on Ubuntu 20.04 - Step by Step Process ?

This article covers how to install and compile Python3.9 using different methods, using PPA repo, compiling it from the source code, and installing it using the Linuxbrew tool.

We can now start using Python 3.9 for our projects.

Python is a high-level programming language, mostly used to write scripting and automation. It is a very popular language known for its simplicity and easy syntax. 

Python one of the best language for for artificial intelligence (AI).


To Install Python 3.9 on Ubuntu 20.04 using APT:

1. Update package list, type:

$ sudo apt update

2. Install software-properties-common package to easily manage distribution and independent software vendor software sources:

$ sudo apt install software-properties-common
$ sudo add-apt-repository ppa:deadsnakes/ppa

3. Now install python 3.9 using apt command:

$ sudo apt-get install python3.9

4. The following command can help to identify the proper install location of Python:

$ which python3

The execution of the above command produces the following output on console:

/usr/bin/python3


Undo the Last Commit in Git - Step by Step Process ?

This article covers how to use the git reset command to undo the last commit in Git. 


To Undo the Last Commit:

The "reset" command is your best friend:

$ git reset --soft HEAD~1

Reset will rewind your current HEAD branch to the specified revision. Here, our goal is to return to the one before the current revision - effectively making our last commit undone.


To Undo Last Commit with revert:

In order to revert the last Git commit, use the "git revert" and specify the commit to be reverted which is "HEAD" for the last commit of your history.

$ git revert HEAD

The "git revert" command is slightly different from the "git reset" command because it will record a new commit with the changes introduced by reverting the last commit.

As a consequence, you will have to commit the changes again for the files to be reverted and for the commit to be undone.



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