I've deployed a couple of challenges, #Klustered style, to @iximiuz.bsky.social's Labs. I hope you have fun trying to fix them, though there is a guide provided if toy want to learn rather than debug. Have fun out there!

Klustered: Level One | Challenge

The cluster is broken. Fix the plumbing to bring the app to life (you'll know it's working when Rawkode taps his watch at you), then ship the v2 image to unlock his victory dance.

labs.iximiuz.com

Following up on my etcd playgrounds, here is a sneak peek of my latest work: a @containerd.dev‬ playground. As usual, it will be available on @iximiuz.bsky.social labs soon.

Starting some more looking into k8s things the way I usually do now, with a nice ephemeral k8s-omni playground from @iximiuz.bsky.social

Following up on my previous post, here is another tutorial about operating @openbao-official.bsky.social and @hashicorp.com Vault on @iximiuz.bsky.social Labs. Auto Unseal OpenBao/Vault with the Transit Secrets Engine: labs.iximiuz.com/tutorials/o... bsky.app/profile/did...

1/4 Secret management is a critical yet often overlooked aspect of DevOps. (Raise your hand if you've ever intentionally committed secrets to a Git repository.) This is why I've begun creating a series of educational content on the subject.

TIL that adding CAP_SYS_ADMIN to a k8s pod has different behaviour depending on the backing CRI. With Containerd it does nothing (you need to call it SYS_ADMIN) but on CRI-O it will add ok. Also TIL k8s doesn't validate the capabilities you add to pods!

Experimenting with using @iximiuz.bsky.social labs for interactive blog content, so I re-worked one of my container security fundamentals blogs labs.iximiuz.com/tutorials/co... . Interested in any feedback on what people reckon to the format :)

Containers are processes | iximiuz Labs

In this brief tutorial we'll explore the idea that Docker containers are just processes, from the perspective of the operating system. Based on this Securitylabs blog post https://securitylabs.datadog...

labs.iximiuz.com

This is the way! 🚀

Rory McCune@mccune.org.uk · last yr.

Doing the KCP Workshop at #kubecon and thought "it'd be really useful to have an isolated env to run all this code" , one labctl command later, I've got a @iximiuz.bsky.social labs playground spun up and ready to go!

A Visual Guide to SSH Tunnels: Local and Remote Port Forwarding - Article by Ivan Velichko @iximiuz.bsky.social #Network #SysAdmin

A Visual Guide to SSH Tunnels: Local and Remote 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.

iximiuz.com

labs.iximiuz.com a browser-based env's where anyone, from beginners to experienced engineers, can get hands-on experience with containers, K8S, DevOps tools, CI/CD pipelines, observability & loads more. Listen to @iximiuz.bsky.social how it's all started, current adaption: youtu.be/kHjAW7f0EPo

Please join me and thank @iximiuz.bsky.social for giving us a bunch of free premium accounts we can give away to our viewers on our twitch channel ! First two will be offered today !! @iximiuz.bsky.social really rocks ! Please take a look at his amazing labs !

Most of the issues with container images are not b/c of the app being containerized but a poorly written/structured docker file @iximiuz.bsky.social Kyle Quest will offer optimizations for improvements in size, security, & build speed, check out: gooddockerfiles.com

@iximiuz.bsky.social's journey of transitioning from traditional textual and visual explanations in his blog posts to creating interactive, reproducible tutorials -> labs.iximiuz.com has attracted 18,000 registered users, with around 2,000 active users per month. Full Ep -> youtu.be/kHjAW7f0EPo

Kubernetes "native" sidecars are slated for GA in 1.33, so it's a good time to brush up on how (and why) to use them. Solve this practical challenge by reworking a flawed pod, making it use a native sidecar: > Kubernetes Pod With a Faulty Init Sequence labs.iximiuz.com/challenges/k...

If you are into #docker and #containers you must check @iximiuz.bsky.social feed. His content is amazing.

Unpopular opinion: The main value of CKA, CKAD, and CKS is not in the certificate itself but in the preparation phase. Having said that, allow me to present a new iximiuz Labs challenge by Adam Leskis 👏 CKA Practice: Upgrade Multi-Node Kubernetes Cluster labs.iximiuz.com/challenges/c...

CKA Practice: Upgrade Multi-Node Kubernetes Cluster | Challenge

This exercise tests your ability to safely upgrade a multi-node Kubernetes cluster from version 1.30 to 1.31 following the standard upgrade procedure.

labs.iximiuz.com

It's very easy to start a Docker container: docker run nginx ☑️ But can you explain what actually happens when you run this command? I prepared a Docker 101 challenge that helps you explore the internals of Linux containers - check it out: labs.iximiuz.com/challenges/s...

How to Limit CPU and Memory Usage of a Linux Process 🔽 Of course, using cgroups! But there is a number of ways to do it: - Manually editing the cgroupfs filesystem - Using libcgroup's cgcreate and cgexec - Using the mighty systemd-run Practice here 👉 labs.iximiuz.com/challenges/l...

Limit CPU and Memory Usage of a Linux Process | Challenge

Start a Linux process and limit its CPU and memory usage with cgroups.

labs.iximiuz.com

k'exp by @iximiuz.bsky.social is a visual Kubernetes explorer #madewithvuejs that lets you explore Kubernetes capabilities & helps you with application development ✨ - https://madewithvuejs.com/kexp

How do you containerize a Python app the right way? 🤔 Building small and secure images for Python projects is surprisingly hard: - Which base image to choose? - How to manage dependencies? - How to structure the Dockerfile? Learn more (with solutions): labs.iximiuz.com/challenges/d...

Container images to avoid in production - part II: python:3 Yes, it's a Docker Official Image, and it's a good image to build your app, but: - It has TWO pythons inside 🐍 x 2 = 🤯 - It brings 800MB+ of dev/build packages. What to use instead in production 👉 python:3-slim

SSH Tunnels: An age-old trick that's still widely used - Expose a local service to the Internet - Map a remote service to a local port - Query an AWS RDS database with a local GUI client - Access a server in your private VPC from a dev machine ...and a lot more. Visual memo 👇

What's Inside Distroless Container Images: Taking a Closer Look 🧐 Distroless images come in many flavors, and it might not be obvious which one (if any!) is the best fit for your application. Here is my attempt to explain the difference and use cases on a single diagram:

Pulling and Pushing Container Images 🔽 Did you know that the below commands: docker pull nginx docker pull nginx:latest docker pull library/nginx:latest docker pull docker[.]io/library/nginx:latest ...pull exactly the same Docker Hub image? Learn more 👉 labs.iximiuz.com/skill-paths/...

Building container images FROM scratch? Then you need to be aware of these pitfalls 👇 By default, scratch containers lack: - Rootfs layout - CA certificates - Time zone info - Shared libraries - /etc/{passwd,group} Learn more in my new blog post: labs.iximiuz.com/tutorials/pi...

Building Container Images FROM Scratch: 6 Pitfalls That Are Often Overlooked | iximiuz Labs

While "FROM scratch" containers may seem functional, they often lack essential components that programs expect to find in their execution environment. Discover the most common pitfalls of building con...

labs.iximiuz.com

How To Build a Production-Ready Container Image For a Go App 🔽 Is "FROM scratch" good enough for you? Check out these hands-on challenges to learn about the most typical Go container pitfalls: - static linking labs.iximiuz.com/challenges/d... - dynamic linking labs.iximiuz.com/challenges/d...

How Container Networking Works 🧵 1/6: Network namespaces (netns) A separate network namespace gives a Linux container its own virtualized (and fully isolated from the host) network "context" - a loopback device, a route table, netfilter/iptables rules, etc.

Have big and slow containers? Not keeping up with CVEs in your images? We (me and @iximiuz.bsky.social ) can try to help! Send over your Dockerfile, and we’ll provide a refined version in return. A limited time offer 🙂

Computer Networking 101: Forward Ports Like a Pro 🧙‍♂️ The only way to mastery is through practice. Can you map one port to another using: - socat labs.iximiuz.com/challenges/p... - netcat labs.iximiuz.com/challenges/p... - iptables labs.iximiuz.com/challenges/p... Happy hacking!

62 practical exercises if you're preparing for a DevOps, SRE, or Platform Engineer interview 🔽 All challenges: - Have automated solution checking - Packed with hints and theory references - Based on real-life problems I've encountered Check them out: labs.iximiuz.com/challenges

Challenges 🏆 | iximiuz Labs

Practical DevOps problems for all skill levels and interests

labs.iximiuz.com