How to access ports of running containers even when they are not exposed A simple and quick solution that works for almost any container runtime including Docker Desktop, containerd, and Kubernetes.

   Have you ever wondered what actually happens when you ask Docker to publish a port How port publishing implementation differs between Docker Engine and Docker Desktop How to publish a port with containerd How nerdctl and Lima implement port forwarding

   SSH port forwarding explained in a clean and visual way. How to use local and remote port forwarding. What sshd settings may need to be adjusted. How to memorize the right flags.

   Slim distroless containers often lack the much needed exploration and debugging tools. The article shows four different ways to put your debugging tools back into the target container.

   How to explore the filesystem of a container image using nothing but the standard Docker means and without running any containers .

   What are these distroless images, really Why are they needed What’s the difference between a container started from a distroless base and a container started from scratch Let’s take a deeper look.

   How to make container images better What does a better container image really mean Image size vs the number of vulnerabilites. Pros and cons of using Alpine as a base image. Alpine and distroless alternatives.

   How Virtual Machines have been used to deploy services. What old problems containers solve and what new problems create. How Kubernetes used containers to recreate Virtual Machines

   Starting programming , Starting programming in Go , and Starting programming Kubernetes controllers in Go are there different challenges with the exponentially increasing level of complexity.

   How to use Ephemeral Containers to debug Kubernetes workloads with and without the kubectl debug command.

   Learn how to use the k s.io cli runtime library to develop Kubernetes CLI tools that behave like and are as potent as the mighty kubectl.

   When you are new to Docker, the number of commands to study might be truly overwhelming. This article shows a way to internalize the most important Docker commands without the brute force memorization.

   Containers aren’t just processes they are also files What happens on the host’s filesystem when containers are created, started, or exec ed Let’s explore it using Docker in Docker

   How Kubernetes Custom Resources, Controllers, and Admission Webhooks combined is just a fancy way to write APIs.

   Why and how to use io.TeeReader and io.MultiWriter in Go How to connect a Writer to a Reader How to scatter one write operation to multiple writer instances

   How to deal with Kubernetes objects in Go. How to parse JSON into Kubernetes structs. How to create generic Unstructured objects. How to create a runtime.Object by its kind. What are RESTMapper and Scheme

   There are plenty of reasons to call the Kubernetes API using a CLI or GUI HTTP client. This article will show you how to get the API server address, authenticate requests using certificates and Service Account tokens, and call the API using kubectl in the raw mode.

   The article explains the most fundamental concepts of the Kubernetes API Resources, API Groups, Kinds, and Objects preparing the reader to the first access of the API from code.

   Understanding the difference between attach, logs, run, and exec commands through learning the container management internals.

   How to turn Kubernetes cluster into FaaS platform How can standalone VM running nothing but containerd compete with full blow container orchestrator

   What is a Container Container vs. VM Docker vs. Kubernetes. How to organize the learning efficiently

   What is the difference between a Docker Container and a Kubernetes Pod Can a Pod be created with plain Docker commands How are Pods implemented under the hood

   Overview of Cloud Native hands on learning resources: best places to hone Linux, Containers, Orchestration, and Cloud skills.

   Why a reverse proxy returns sporadic HTTP s How to configure idle connection timeout for proper upstream connection reuse

   How to run containers without Docker How to use ctr containerd client What is nerdctl What is crictl

   What is a Docker container Containers vs. Virtual Machines. Linux containers vs. Virtual Machine containers. How OCI runtime spec defines containers. What platforms containers support

   How Docker publishes container ports on the host How to use SO REUSEPORT to make multiple containers listening on the same port How to use iptables to make multiple containers exposed on the same port

   How to get the underlying socket of a net http server or client How to set socket options for a Go http server or client What is a Listener What is a Dialer

   How to quickly setup a local development environment for a server side project How to keep the development environment disposable How to spin up a local Kubernetes cluster in a matter of seconds

   Sharing my understanding of DevOps, SRE, and Platform Engineering based on the first hand experience in SRE and PE domains.

   What languages I put into my programming toolbox and why.

   What is Prometheus Prometheus vs Graphite. Prometheus vs InfluxDB. Learning Prometheus and PromQL.

   How to setup Prometheus playground. How to learn PromQL running example queries How to prefill Prometheus with metric data

   What is a Prometheus metric Metrics vs. Time Series. How scraping works

   What is a parser combinator framework How to write parsers in Rust nom parser example. How to handle nom errors

   How to get Nginx request rate from access.log How to get top K failing URLs How to query log files as time series data

   How to query moving average in Prometheus What moving window functions Prometheus has How to convert a range vector into instant vector

   How Prometheus vector matching works: one to one, one to many and many to one, many to many. What on ignoring clause is for group left and group right explained. Logical set operations explained.

   How not to bloat container images and decrease the cyber attack surface as a result.

   How to define a module in Rust What is a root module How to define nested modules How pub modifier works

   What is the difference between a bridge and a network switch What is a managed network switch How network can be organized in a data center

   What is a LAN What is a network segment Ethernet collision domains vs broadcast domains. How network switches work How to send IP packets VLAN vs VXLAN.

   How to load local docker image into kind cluster node. Why loaded docker image may not work. How Kubernetes imagePullPolicy work.

   The danger of panic in Go HTTP handler code. How panic recovery can lead to a deadlock.

   What is Kubernetes Operator Kubernetes API design. Kubernetes Custom Resources and CRDs explained.

   Implementing simple TCP echo server in plain Python covering basics of TCP IP stack.

   Everything comes at a price, and the price for microservices is a myriad of CNCF projects.

   Service discovery in Kubernetes takes the best of traditional client and server side implementations, thanks to éminence grise kube proxy component.

   REST vs RPC vs gRPC vs protobuf

   Revealing the nature of container networking it’s a simple but powerful combination of Linux virtual network facilities.