How to Build a Square in Python
The challenge I will give you an integer. Give me back a shape that is as long and wide as the integer. The integer will… Read More »How to Build a Square in Python
Check if String EndsWith in Python
The challenge Complete the solution so that it returns true if the first argument(string) passed in ends with the 2nd argument (also a string). Examples:… Read More »Check if String EndsWith in Python
How to add a Git Submodule to an existing codebase
Git submodules are a way of including another repository’s code into an existing codebase, without associating it’s code or tracking history in the parent repository.… Read More »How to add a Git Submodule to an existing codebase
How to LowerCase a String in Python
Python comes with a built-in method on all String types, by calling lower() on a String, you can immediately lower the case of that String.… Read More »How to LowerCase a String in Python
How to Restart Sound Driver on a Mac
So for some strange reason, your audio has stopped playing through the Macbook Pro speakers, but if you plug in an external audio device, it… Read More »How to Restart Sound Driver on a Mac
Number to Binary Conversion in Python
If you have a decimal number, and want to get it’s binary value, you can use the built-in bin method. We can see that it… Read More »Number to Binary Conversion in Python
Counting Binary Gaps with Python
The challenge A binary gap within a positive integer N is any maximal sequence of consecutive zeros that is surrounded by ones at both ends in the… Read More »Counting Binary Gaps with Python
How to Delete a Secret in Kubernetes
Once you have a secret in Kubernetes, if you know it’s name, you can delete it. How to find the secret name You can get… Read More »How to Delete a Secret in Kubernetes
How to Decode a Secret in Kubernetes
Secrets in Kubernetes are encoded using base64. If you have the secret name, you can ask for its value. If not, then learn how to… Read More »How to Decode a Secret in Kubernetes
How to Verify a Secret in Kubernetes
You have created a secret, and would like to retrieve it. Get a list of all the secrets in Kubernetes This will result in: How… Read More »How to Verify a Secret in Kubernetes
How to Create a Secret in Kubernetes
Secrets allow applications to not hardcode usernames, passwords or additional information such as hostnames, IP addresses or other protected/sensitive information. Create a Secret in Kubernetes… Read More »How to Create a Secret in Kubernetes
How to Divide an Array into Chunks in PHP
If you have a single-dimensional array, and want to break it into chunks, you can use the array_chunks method. It takes 3 arguments: The input… Read More »How to Divide an Array into Chunks in PHP
How to setup Certbot wildcard certificate on Apache
Certbot allows simple, quick and free provisioning of SSL certificates using LetsEncrypt. How to install Certbot Option 1 (recommended) Option 2 How to run Certbot… Read More »How to setup Certbot wildcard certificate on Apache
How to retrieve a Secret from AWS Secrets Manager in the CLI
If you have stored a secret in AWS using the Secrets Manager, it is possible to use the AWS CLI to retrieve this value at… Read More »How to retrieve a Secret from AWS Secrets Manager in the CLI
Determine the Last Digits of N^2 == N in Java
The challenge Let’s call an integer number N ‘green’ if N² ends with all of the digits of N. Some examples: 5 is green, because 5² = 25 and 25 ends with 5. 11 is not green,… Read More »Determine the Last Digits of N^2 == N in Java
How to Expose your App through a Service in Kubernetes
Once you have deployed an application into Kubernetes, it will not be available to the outside world. For this to be possible, you need to… Read More »How to Expose your App through a Service in Kubernetes
How to connect to Bash on a Kubernetes pod
If you find yourself needing to jump into a Kubernetes pod to either diagnose an issue, or run a particular command, you can use the… Read More »How to connect to Bash on a Kubernetes pod
How to get the Environment variables in a Kubernetes Pod
If you need to list the environment variables in a Kubernetes pod, you can do the following. 1. Get the Pod name to query kubectl… Read More »How to get the Environment variables in a Kubernetes Pod
How to find out Cluster Info in Kubernetes
In Kubernetes, a cluster is a group of machines working together. By running the kubectl cluster-info command, we can find out high level information about… Read More »How to find out Cluster Info in Kubernetes
How to set and use a kubeconfig in Kubernetes
The kubeconfig file is the main configuration file that allows access to a Kubernetes cluster. When you first create your Kubernetes cluster, you are given… Read More »How to set and use a kubeconfig in Kubernetes
How to Map over a List of Lists in Java
The challenge Write a function which maps a function over the lists in a list: Example 1: Example 2: The solution in Java code Option… Read More »How to Map over a List of Lists in Java
How to Differentiate a Polynomial in Java
The challenge Create a function that differentiates a polynomial for a given value of x. Your function will receive 2 arguments: a polynomial as a string,… Read More »How to Differentiate a Polynomial in Java
Find the Sums of Perfect Squares in Java
The challenge The task is simply stated. Given an integer n (3 < n < 109), find the length of the smallest list of perfect squares which add up… Read More »Find the Sums of Perfect Squares in Java
Solution: Error: Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:2.4.4:repackage (repackage)
If you have come across this error when trying to build and deploy your Spring Boot Maven application then this post will help you! Error:… Read More »Solution: Error: Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:2.4.4:repackage (repackage)
Solved: Error – no main manifest attribute
You’ve built a Java project and packaged a .jar file. You are ready to run it outside your IDE, or deploy it somewhere. When you… Read More »Solved: Error – no main manifest attribute