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Ivan Velichko Profile picture
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20 Dec, 9 tweets, 4 min read
The great rise of cloud-native projects (thread).

Microservices don't solve any technical problems. Instead, microservices are trying to solve org challenges.

...by turning org problems into new tech challenges.
In accordance with the complexity conservation law, microservice architectures should be bringing a lot of new problems yet to be solved.

ferd.ca/complexity-has…
Thesis: the goal of the majority of the CNCF projects is to solve those technical problems originated by the microservice transition.

landscape.cncf.io
Example 1: more services mean more network communication. Hence, the rise of popularity of RPC projects (gRPC, Thrift, etc).

landscape.cncf.io/category=remot…
Example 2: more services talking to each other mean chaos. Service mesh to the rescue - observability, reliability, and security out of the box.

landscape.cncf.io/category=servi…
Example 3: more services mean less trust. A reliable Identity mechanism becomes a must-have. Spiffe and spire are there to help.

landscape.cncf.io/category=key-m…
Example 4: more services mean more APIs. Before exposing these APIs publicly, they need to be consolidated and secured. Luckily, there are a plethora of API gateway projects.

landscape.cncf.io/category=api-g…
Example 5: more services mean scattered logs, tricky bug hunting, and tons of metrics.

- logging category landscape.cncf.io/category=loggi…

- tracing category landscape.cncf.io/category=traci…

- monitoring category landscape.cncf.io/category=monit…
And so on and so forth...

Are you struggling to wrap your head around that cloud-native zoo? You are paying price for microservices.

iximiuz.com/en/posts/makin…

#microservices

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More from @iximiuz

Ivan Velichko Profile picture
19 Dec
Kubernetes is a Distributed Operating System (thread):

1. One of the primary goals of a traditional operating system (e.g Linux) is to share a machine's resources between apps. While "Kubernetes is all about sharing machines between applications."
2. An operating system gives you a handy way to launch your apps. So does Kubernetes.
3. An operating system gives you a handy way to install apps. So does Kubernetes (through raw YAML or a package manager like Helm).
Read 5 tweets
Ivan Velichko Profile picture
18 Dec
Kubernetes is deprecating Docker as a container runtime after v1.20. But nobody cares. Why? Because images built with Docker will keep working on Kubernetes.
So does images created with Podman and most of the other build tools around. Why? Because of the great standardization effort called OCI!

opencontainers.org
OCI contains two specifications: the Runtime Specification (runtime-spec) and the Image Specification (image-spec).
Read 14 tweets
Ivan Velichko Profile picture
12 Dec
One of the Kubernetes superpowers is how it tackles the networking problem. Here is my approach to gaining a comprehensive understanding of the topic.

1. Learn the super-simple Kubernetes Network Model: much like VMs, every Pod gets its own IP address.

kubernetes.io/docs/concepts/…
2. Learn that achieving simplicity is hard:

2.1. Networking on a single Node. How containers communicate within a Pod, how Pods talk to each other within a Node. Long story short, it's all about Linux namespaces and network virtualization capabilities.

iximiuz.com/en/posts/conta…
2.2. Cross-node Pod-to-Pod networking. Kubernetes demands that every Pod should get its own IP. But it doesn't say how. Makes sense actually, because it's highly infra-specific. Use a plugin like Flannel or Calico instead. Keyword - overlay networks.

kubernetes.io/docs/concepts/…
Read 18 tweets

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