How to Dockerize a Flask App
If you have a Flask app that you would like packaged in a Docker container, then you can do the following. The steps outlined below will help you …
Read Article →Technical Articles
In-depth guides, insights, and best practices for modern software engineering
How to get an EKS Cluster name from an AWS Region
You can use the aws cli to get the EKS cluster name, parse the first result and return it into a variable.
This is handy in automation scripts where …
Read Article →How to automatically generate a Manifests file in Kubernetes
If you want to automatically generate a manifest file in Kubernetes, you can do so by using the kubectl run command coupled with a --dry-run to output …
How to Sort Pods by CreationTimestamp in Kubernetes
If you need to sort a list of your pods by their CreationTimestamp, then do the following:
kubectl get pods -n kube-system …How to Jump onto a Kubernetes Pod with Bash
If you want to jump onto a particular Kubernetes Pod and run Bash within it, you can do so as follows:
kubectl exec -ti <pod_name> /bin/bash
You …
Read Article →How to run Shell Commands in a Kubernetes Cluster
If you would like to run shell commands inside of your Kubernetes cluster, then you can use the kubectl run command.
What the syntax looks like …
Read Article →How to Bulk Move All Email from One Account to Another using the CLI
If you find yourself in a position where you need to sync all emails from one account to another, then you can use the imapsync command-line tool to …
How to Install AWS CLI on Linux
You can download and install the AWS CLI v2 on Linux as follows. This works on most x86_64 Linux distributions including Ubuntu, Amazon Linux, and …
Read Article →How to Reboot Networking on Mac from CLI
If you need to reboot, or restart the networking interface on your Mac, by using the CLI, then you can issue the following commands:
Using the …
Read Article →[Solved] fatal: unable to access <git>: SSL certificate problem: self signed certificate in certificate chain
If you get the following error:
fatal: unable to access <git>: SSL certificate problem: self signed certificate in certificate chain
..when …
Read Article →How to Extract the Files in a Docker Image
Ever needed to extract the files in a Docker container?
Docker provides the save sub-command.
Exporting Docker files into a Tar Archive
The examples …
Read Article →[Solved] Error response from daemon: No such image: Docker
If you’ve run into this dreaded error:
Error response from daemon: No such image:
Then you can solve it as follows:
Step 1
Perform a docker pull …
How to Bootstrap a Web Server on AWS EC2
When you launch an EC2 instance, you can use the user-data to bootstrap a instance creation script.
We can use the following code to start a web …
Read Article →How to Update Kubectl Config from AWS EKS
Ever searched for kubectl update config from aws eks and needed a quick result?
Step 1 – Validate AWS CLI
Make sure that you have valid AWS …
Read Article →How to Generate a Random String in Java
Java provides many ways to generate random strings.
1. Using Apache Commons
public void generatingRandomAlphanumericString_ApacheCommons() { …How to Generate a Random String in Python
Python gives the ability to generate random strings out of the box, by using a combination of the string and random modules.
import string
import …How to Generate a Random Number/String in Terraform
If you need to generate a random number or string in Terraform, then you can use the following:
This is useful when you need unique names for …
Read Article →[Solved] Unable to connect to the server: dial tcp: lookup with AWS EKS
If you have received the following error while trying to issue commands to kubectl:
Unable to connect to the server: dial tcp: lookup
Then it may be …
Read Article →How to Store Terraform State in AWS S3
Storing Terraform states files locally is not recommended. Instead you should use a backend such as as S3 from AWS.
To do this, you just need to add …
Read Article →[Solved] ZipArchive extension: disabled/not installed on Ubuntu
If you have come across the following error:
ZipArchive extension: <strong>disabled/not installed</strong>
This just means that …
Read Article →Calculating Cartesian Neighbors Distance in Golang
The challenge
We have been searching for all the neighboring points in a Cartesian coordinate system. As we know each point in a coordinate system has …
Read Article →How to Calculate Dominant Primes in Golang
The challenge
The prime number sequence starts with: 2,3,5,7,11,13,17,19.... Notice that 2 is in position one.
3 occupies position two, which is a …
[Solved] error: src refspec main does not match
When you first try and push to a git repository, you may get the following error message:
error: src refspec master does not match any.
error: failed …How to Solve Simple Square Numbers in Golang
The challenge
In this challenge, you will be given a number n (n > 0) and your task will be to return the smallest square number N (N > 0) such …