I often search for container images, and here is my pain:

- There is more than one place to go - Docker Hub, GCR, Quay
- Some software has multiple image providers - e.g Envoy
- Image trustworthiness and difference are obscure

My recent cool finding - slim.ai 🔽
I'm always hesitant to add a new tool to my toolset - in the end, it's yet another dependency and extra time investment.

But Slim .AI has all the chances to pass my high barrier 🙃

Seems like it can really help me start with the right image faster. ImageImage
The difference between some images has been obscure to me for a while.

Of course, I could fetch them and compare locally, but since it's just for some ad-hoc playgrounds, I've never done it.

With Slim, I can know the difference right in my browser: ImageImage
Exploring the content of the images became also greatly simplified: ImageImage
And since Slim.AI is a centralized place connecting most of the popular image sources under one roof, it has all the chances to become a trustworthy image assessment and comparison platform.

(P.S. I've no affiliation with the company)

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More from @iximiuz

22 Dec 21
Kubernetes UI/GUI/CLI projects

Gathered a list of (mostly open-source) projects offering Kubernetes UX enhancements.

Starting from the well-known solutions and down to projects mounting the Kubernetes API as a FUSE filesystem 🔽
github .com/lensapp/lens
stats: TypeScript / 16.8k stars
descr: Lens - The way the world runs Kubernetes
github .com/derailed/k9s
stats: Go / 14.6k stars
descr: Kubernetes CLI To Manage Your Clusters In Style!
Read 24 tweets
8 Dec 21
How to Run a FaaS Platform On Your Own Terms

FaaS is a higher-level kind of Serverless tech where the smallest deployable unit is a Function.

AWS Lambda, Azure Functions, GCP Cloud Function are all super handy, but what if you can't use them for some reason?

Meet OpenFaaS! 🔽
OpenFaaS is an open-source project that turns a piece of lower-level infra into a high-level FaaS solution.

Sounds too abstract?

Kubernetes cluster + OpenFaaS = FaaS API
Single VM + containerd + OpenFaaS = same FaaS API!

where FaaS API is:
- mgmt. methods
- invoke functions
At a high level, OpenFaaS has a universal architecture that allows it to be installed on almost any kind of infra:

API Gateway (concrete) + FaaS-Provider (abstract)
Read 7 tweets
30 Oct 21
How Kubernetes differs from Docker in the way it deals with containers 🔽

Under the hood, Kubernetes and Docker both rely on the same/similar lower-level components to run containers.

Often, both use containerd and runc. However, Kubernetes makes the container runtime pluggable
Even when Kubernetes uses exactly the same container runtime as Docker, the implementation of Pods differs from the implementation of Containers.

Pods are more than just groups of containers. Containers in a pod share net, ipc, and uts namespaces making pods more similar to VMs.
Not all Containers are Linux containers!

OCI Runtime Spec doesn't limit container implementation to namespaces and cgroups. And VM-based containers is a real thing!

Some of the container runtimes supported by Kubernetes (e.g., Kata), launch a micro-VM per Pod.
Read 6 tweets
20 Oct 21
Computer Networking in Layman's Terms (thread)

L2 - Ethernet
L3 - IP
L4 - TCP

Lots of server-side folks are fluent with L4/L7 concepts. But understanding L2/L3 is often important too!

Especially if you deal with containers, Kubernetes, or DC networking constraints 🔽
Example ✏️

By default, Docker/podman/containerd/etc. use a `bridge` network to interconnect containers on a single host. But what is a Bridge?

In the case of containers, a Bridge is a virtual device. However, it simulates a real-world L2/L3 networking device called a Switch.
A Switch is a multiport device that combines two logical functions: L2 bridging and L3 routing.

Bridging creates an L2 broadcast domain out of connected nodes. A single broadcast domain _usually_ forms an L3 network.

Routing creates an (inter)network out of L3 (sub)networks.
Read 8 tweets
3 Oct 21
Cloud-Native Learn-by-Doing Platforms (part 2) ✏️

I closely reviewed 10+ platforms providing a hands-on learning experience to study:

- Linux
- Containers
- Orchestration
- other Cloud-Native stuff

My findings (thread) 🔽

#kubernetes #docker #containers #linux #sre #devops
1. A Cloud Guru (acloudguru .com)

A really massive platform for individuals and businesses.

- 360+ courses and 1,600+ hands-on labs
- Clouds: AWS, GCP, etc.
- Tech: Kubernetes, Docker, Serverless

- Servers
- Temporary cloud accounts

2. Developer Sandbox for Red Hat OpenShift (developers.redhat .com/developer-sandbox)

A free platform with a private OpenShift playground:
7 GB RAM, 15GB storage 🔥

Almost no educational content, but combines well with kubebyexample .com.
Read 7 tweets
30 Aug 21
iptables - a userspace program to configure IP packets filtration and modification rules.

It's a dated but still widely used tool:

- Linux firewall
- Container egress (SNAT) and port publishing (DNAT)
- Kubernetes service discovery
- Service Mesh transparent injection
- etc. 🔽 Image
iptables comes with its own terminology:

- tables
- chains
- rules
- targets
- policies

...that might be challenging to grasp. Here is how I approach it.

1. Come up with a logical model of packet processing inside the Linux kernel. Give meaningful names to stages. Image
2. Understand possible packet paths through the kernel.

Packet from a local process:

Packet to a local process:

Packet forwarded between interfaces:
Read 6 tweets

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