Illustration: Network Policies

Aoi Takahashi — Sat, 02 May 2026 23:43:47 +0000

CKS Study Memo on Network Policies

official document: https://kubernetes.io/docs/concepts/services-networking/network-policies/

You can control traffic between pods using the NetworkPolicy resource.
Use NetworkPolicy when you want to restrict traffic, for example for security reasons.
So what we need to know is how to write a NetworkPolicy manifest.

In the sample manifest, the selectors are written like this.

  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          user: alice
    - podSelector:
        matchLabels:
          role: client

This means the policy is applied if the namespace label is user:alice OR
the pod label is role:client.

If you want an AND condition instead, write it like this.

  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          user: alice
      podSelector:
        matchLabels:
          role: client

Stay tuned for more CKS topics!

Comic Book: Learn Kubernetes the Manga Way

Aoi Takahashi — Sat, 25 Apr 2026 09:08:28 +0000

Do you want to learn Kubernetes in a fun way?

I wrote a manga (comic book) about Kubernetes back in 2019 — in Japanese.

Recently, I gave a talk at KubeCon + CloudNativeCon Europe 2026, and it inspired me to finally translate it into English.

I shared printed copies with friends at the conference, and the response was amazing!

So here we are — I'm making the English PDF available online. Stay tuned for the download link!

If you want to read rest of the comic, please access to the page!

Free to download!

Learn Kubernetes the Manga Way - Payhip

A beginner-friendly Kubernetes manga featuring Otofu-kun, a cute cat guide.First published in 2019. The core concepts still hold up, though some specifics may reflect older versions.Free to download — enjoy!36p PDF

payhip.com

Forem: Aoi Takahashi

Illustration: Network Policies

Comic Book: Learn Kubernetes the Manga Way

Learn Kubernetes the Manga Way - Payhip