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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 Cockpit on Ubuntu 20.04 - Step by step process to do this ?

This article covers how to install Cockpit on Ubuntu 20.04 system. Cockpit is a free and open source web console tool for Linux administrators and used for day to day administrative and operations tasks. 


To Install the Cockpit package on Ubuntu 20.04 LTS Server, run the command:

$ sudo apt update
$ sudo apt install cockpit -y

Once cockpit package is installed successfully then start its service using the following systemctl command,

$ sudo systemctl start cockpit

Run the following to verify the status of cockpit service,

$ sudo systemctl status cockpit


Features of Cockpit:

Cockpit allows you to perform:

1. Service Management – Start, stop, restart, reload, disable, enable, mask e.t.c

2. User Account Management – Add users, delete, Lock, assign Administrator role, set password, force password change, Add Public SSH keys e.t.c.

3. Firewall Management

4. Cockpit Container management

5. SELinux Policy management

6. Journal v2

7. iSCSI Initiator configurations

8. SOS-reporting

9. NFS Client setup

10. Configure OpenConnect VPN Server

11. Privileged Actions – Shutdown, Restart system

12. Join Machine to Domain

13. Hardware Device Management

14. System Updates for dnf, yum, apt hosts

15. Manage the Kubernetes Node


Install Apache Web Server on CentOS 8 - Step by Step process to do it ?

This article covers how to install Apache web server on CentOS 8 distribution. With Apache we server, you can host web pages over the network. Apache is available within CentOS's default software repositories, which means you can install it with the dnf package manager.


To install Apache on CentOS:

1. Execute the command below to install the Apache package:

$ sudo dnf install httpd

After confirming the installation, dnf will install Apache and all required dependencies.

2. If you also plan to configure Apache to serve content over HTTPS, you will also want to open up port 443 by enabling the https service:

$ sudo firewall-cmd --permanent --add-service=https

3. Next, reload the firewall to put these new rules into effect:

$ sudo firewall-cmd --reload

After the firewall reloads, you are ready to start the service and check the web server.


To check your Apache Web Server:

1. Apache does not automatically start on CentOS once the installation completes, so you will need to start the Apache process manually:

$ sudo systemctl start httpd

2. Verify that the service is running with the following command:

$ sudo systemctl status httpd

You will receive an active status when the service is running.


To manage the Apache Process on CentOS:

Now that the service is installed and running, you can now use different systemctl commands to manage the service.

1. To stop your web server, type:

$ sudo systemctl stop httpd

2. To start the web server when it is stopped, type:

$ sudo systemctl start httpd

3. To stop and then start the service again, type:

$ sudo systemctl restart httpd

4. If you are simply making configuration changes, Apache can often reload without dropping connections. To do this, use this command:

$ sudo systemctl reload httpd

5. By default, Apache is configured to start automatically when the server boots. If this is not what you want, disable this behavior by typing:

$ sudo systemctl disable httpd

6. To re-enable the service to start up at boot, type:

$ sudo systemctl enable httpd

Apache will now start automatically when the server boots again.


Steps to create and run a Perl script in Ubuntu 20.04 LTS ?

This article will guide you on steps to #install Perl and how to create and run Perl #script using the command line on #Ubuntu 20.04. We have also discussed how to configure necessary #Perl #modules on your system.

Perl is a programming language that can be used to perform tasks that would be difficult or cumbersome on the command line. Perl is included by default with most GNU / #Linux #distributions. Usually, one invokes Perl by using a text editor to write a file and then passing it to the perl #program.

Perl has a wide range of command-line options or switches that you can use. The options are also called switches because they can turn on or turn off different behaviors. For example, the -e option lets you specify a line of code directly on the command line instead of creating a script file.

To install Perl in Linux:

1. SSH to your server.

2. Change your directory to /opt by running the below command. cd /opt.

3. Download the zipped source code available for Unix/Linux.

4. After download the zip file runs the below commands to extract and install Perl.


Steps to Create and run a Perl script in CentOS 8 ?

This article will guide you on steps to perform Perl installation on #CentOS 8. You will also learn how to create and execute the #Perl #script on your CentOS system by using the terminal #commands.

Perl is a programming language that can be used to perform tasks that would be difficult or cumbersome on the command line.

To run a Perl script in Linux:

1. Run the "perl" command with the Perl script included in the command line.

2. Run the "perl" command with the Perl script supplied from the standard input stream.

3. Run the "perl" command with the Perl script supplied in a file.

4. Run Perl script files as commands.