Autoupdate Kubernetes Deployment on GitHub Webhook
In this article, I’ll discuss how to autoupdate a Kubernetes workload or deployment on receiving a GitHub Webhook when a new version of the app is released. Prerequisites For understanding and following the instructions in this demo you need to have a basic understanding and some working knowledge of the following tools.
Read more…Docker Compose Auto Update on GitHub Webhook
In the last week’s demo, we discussed how to setup a Continuous Deployment(CD) pipeline for a native NodeJS application. In this article, I’ll show you how to build a GitOps style CD pipeline that keeps a Docker Compose deployment in sync with a docker-compose.
Read more…How to install Jenkins on Ubuntu 20.04 LTS
In this tutorial, I’ll show you how to install Jenkins on Ubuntu 16.04 and configure Jenkins. You can also refer to the Jenkins download page to see the instructions. Prerequisites: Ubuntu 16.
Read more…Kubernetes Security - Configuring Network Policies
Kubernetes Network Policies are similar to ACL’s and Route Policies that one could configure in networking devices such as Routers, Switches and Firewalls. If you are CCNA Certified or familiar working with Cisco routers, then Network Policy is a familiar topic to you.
Read more…Kubernetes Security - User Authentication and Authorization (RBAC)
In the article, we’ll discuss how to create credentials and add a new user to the Kubernetes Cluster to perform various roles in the cluster. To add a new user, we as an Admin, should create and approve the SSL Private Keys and Certificate for the user using the Kubernetes Certificate Manager.
Read more…Accessing Kubernetes API Server Through REST API's
Typically, we use Kubectl CLI utility to talk to the Kubernetes API server to create, update, delete, read any Kubernetes objects like Pods, Deployments, Services etc. In this tutorial, I’ll show you how to directly access the Kubernetes API server using the REST API’s.
Read more…Kubernetes - How to Install Minikube in a VM
What is Minikube Minikube is a miniaturized version of the Kubernetes Cluster Platform. You can install minikube in your laptop, for development, testing and customer demo purposes. Minikube provides a single node cluster, to run and test application containers.
Read more…Kubernetes Dashboard Setup and Login
Deploy the Dashboard UI: master$ kubectl create -f https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml We can either directly talk to the API server to connect to the dashboard or if we would like to use the “kubectl” command then we should run the following proxy command.
Read more…Kubernetes Horizontal Pod Autoscaler and Metric Server
What is Horizontal Pod Autoscaler(HPA) The Horizontal Pod Autoscaler automatically scales up or scales down the number of pods in a deployment based on some metric such as CPU usage or some other custom metric.
Read more…Docker Containers Tutorial - Persistent Storage Volumes and Stateful Containers
In this article, I’ll show you how to mount persistent storage volumes inside a Docker container, so that Stateful Applications such as MySQL or MongoDB or PostgreSQL could be run as Docker Containers.
Read more…Kubernetes Tutorial - Hands On For Beginners
In the previous two Kubernetes tutorials, we saw how to install and setup a Kubernetes cluster and we discussed the fundamental building blocks of Kubernetes. In this tutorial, we’ll do a hands-on session on how to run a web application as a docker container in the Kubernetes Cluster we created previously.
Read more…Kubernetes Tutorial - Getting Started on the Basics
The goal of this Kubernetes Tutorial is to get started on the basics. We’ll explore the various building blocks of Kubernetes and the terminologies used. What is Kubernetes: Kubernetes is a container orchestration or management platform.
Read more…Microservices Architecture Pros and Cons
Microservices Architecture has become a buzz word in the industry creating so much hype around it. Many organizations are just puzzled and in fact, feel guilty that they have been following a completely wrong architecture all along.
Read more…Docker Container Tutorial - Creating Docker Container Images
How to create Docker images: In this tutorial we’ll see how to create Docker container images. There are two methods to create a docker image: Manual method Dockerfile method Manual Method: First let’s pull and run a latest version of ubuntu container.
Read more…Docker Container Tutorial - Docker Swarms
Docker Swarm is a very useful management tool when we have more than one container and more than one host to manage. In other words, when we have a “swarm of containers” it is nearly impossible to manage each one of them individually.
Read more…Docker Container Tutorial - Running A Simple Docker Container
How to install Docker CE(Community Edition) Docker CE is the mini version of Docker available to download for free for beginners to learn and experiment with Docker containers on a laptop.
Read more…How to Install SSL Certificate in WordPress VM
In this article, we’ll discuss how to install SSL Certificate in any Linux based VM, including the WordPress VM running in Google Cloud Platform(GCP) It doesn’t matter whether the VM is running in GCP or in your local server or anywhere.
Read more…Kubernetes Tutorial - How to Install Kubernetes on Ubuntu Baremetal
The primary goal of this tutorial is teach how to install Kubernetes on Ubuntu and configure a Kubernetes Cluster using a Master and Worker node. [This is the the first lab in the Kubernetes Tutorial.
Read more…Kubernetes vs Docker Swarm - 5 Major Differences
Here are the 6 differences between Docker Swarm and Kubernetes. But before that let’s refresh some basics on Docker and Kubernetes. If you are in a haste, you can jump straight to Kubernetes vs Docker Swarm debate down below.
Read more…Linux Networking Commands to Debug Troubleshoot IP / UDP / TCP Packet Loss
Recently, I happened to debug an UDP flow packet loss issue happening within an ubuntu LXC container. It was not obviously evident why the UDP packets were getting dropped. However, the tcpdump utility showed that the packets are indeed being received by the ingress interface (eth0) of the container.
Read more…Linux Container Internals - Fundamentals of Linux Containers
What are containers ? Containers are groups of userspace processes running in an isolated or contained virtual environment of their own, created within a single host or a VM. The isolated (contained) environment for each of the containers is created using the virtualization primitives provided by the modern Linux Kernel such as namespace, cgroups, etc.
Read more…Linux Containers - Advanced LXC Networking - Part 01
In the previous article I discussed about some basic LXC networking concepts. In this article I’ll discuss about the LXC configuration files that play a key role in automated provisioning of the interfaces and bridges.
Read more…Linux Container (LXC) Networking Fundamentals
We saw how to create an LXC container in the previous article. In this article we’ll see how to set up a basic network for LXC and make it communicate to the outside world.
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