Psql is a command-line interface for interacting with PostgreSQL, a powerful and open source relational database system. Brew is a package manager for macOS that makes it easy to install and manage software. Here are the steps to install psql with brew:

• First, install the brew package manager if you don’t have it already. You can do this by running the following command in your terminal:

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

• Second, update brew by running the following commands:

brew doctor
brew update

• Third, install libpq by running the command:

brew install libpq

Libpq is a library that contains psql and other PostgreSQL client utilities.

Kubernetes is a powerful platform for managing containerized applications across a cluster of nodes. However, sometimes you may want to have more control over which pods are scheduled on which nodes, for various reasons such as performance, security, or cost.

What are taints and tolerations?#

Taints and tolerations are a feature of Kubernetes that allow you to mark nodes with certain attributes or conditions, and then specify which pods can or cannot be scheduled on those nodes based on those attributes or conditions. Taints are applied to nodes, and tolerations are applied to pods.

Prerequisites#

Login to your Debian 9 system using shell access. For remote systems connect with SSH. Windows users can use Putty or other alternatives applications for SSH connection.

ssh root@debian9

Run below commands to upgrade the current packages to the latest version.

sudo apt update 
sudo apt upgrade

Let’s execute the following commands to install the required packages first on your system. Then import packages signing key. After that configure PPA for the PHP packages on your system.

In the realm of Infrastructure as Code, Terraform modules can play a significant role in making your life easier. Sometimes, however, these modules don’t live at the root directory of their source package. Instead, they reside in sub-directories. Thankfully, Terraform has a smart way to help you access these nested modules.

Terraform employs a unique double-slash (//) syntax to help pinpoint the exact sub-directory where the module is located. The path that follows this double-slash syntax is considered to be a sub-directory within the package or repository.

Are you stuck with two Git repositories or branches that have completely different histories, but you need to merge them? You may be hitting a roadblock because Git is designed to prevent this kind of operation by default. However, there’s a workaround for this, and it’s simpler than you might think.

The Problem: Unrelated Git Histories#

Imagine you’re working on a project where you have a main branch, and someone else has a completely separate project with its own history. Now, you want to combine both projects into a single repository. If you try to perform a regular git merge or git rebase, Git will likely stop you with an error message, something like:

What is the Ansible Provisioner in Packer?#

If you’re dabbling in the DevOps world, chances are you’ve come across Ansible and Packer. But how about combining them? The Ansible provisioner in Packer lets you run Ansible playbooks while creating your machine images. In simpler terms, it helps you set up your server environment automatically, just the way you like it, while Packer goes about its business creating a machine image.

Introduction#

SSHPass is a nifty little tool that lets you automate SSH login by bypassing the usual password prompt. While it’s super convenient for scripting, bear in mind that it’s not ideal for a multi-user setup due to security concerns. However, if you’re using it on your personal development machine, it’s pretty harmless.

How to Install SSHPass on Ubuntu#

Installing SSHPass on Ubuntu is as straightforward as it gets. All you need to do is open up your terminal and run the following command:

What You Need Before You Begin#

Operating System Requirements#

First things first, make sure you’re running one of the following 64-bit Ubuntu versions to install Docker CE:

• Ubuntu 18.04 (Bionic) - LTS
• Ubuntu 17.10 (Artful)
• Ubuntu 16.04 (Xenial) - LTS
• Ubuntu 14.04 (Trusty) - LTS

Docker CE is compatible with these architectures: x86_64, armhf, s390x (IBM Z), and ppc64le (IBM Power).

Note: For IBM Z and Power architectures, you’ll need at least Ubuntu 16.04 (Xenial) or higher.

Basic Perl “Hello World” Script (hello.pl)#

Let’s start with the basics. Here is a straightforward “Hello World” script written in Perl. Create a new file and name it hello.pl.

#!/usr/bin/perl
use strict;
use warnings;
use diagnostics;

print "-----------\n",
      "Hello World\n",
      "-----------\n";

In this script, we’re using Perl’s built-in modules for error handling (use strict; use warnings; use diagnostics;) to make sure the code is robust.

Introducing Expect Bindings with Perl (test.pl)#

Now, let’s dive into the main topic: how to use Expect bindings in a Perl script. Create another file, test.pl, and add the following code:

disableHLJS: false#

When it comes to software development, a robust and efficient build script can be a game-changer. Whether you’re working on a Java project or any other type of application, the right build script can streamline the whole process and make life a whole lot easier for developers. Here’s a rundown of some best practices to keep in mind when you’re writing your build script:

Platform Independence#

Choose a programming language that is compatible across multiple platforms, especially if you’re working on a Java project. This flexibility will save you from a lot of headaches down the line when dealing with different operating systems.