juniorz

(not always bizarre, sometimes just backfiring daily design)

Kubernetes

• HorizontalPodAutoscaler takes into account Terminating pods when calculating the metrics. The consequence is if a pod has a bug on its termination procedure, terminating pods as part of a scale down triggers a scale up.
  • It once did the same for Pending pods.
• Can't omit clusterIP if you ever set it (even if to "") https://gitlab.com/gitlab-org/charts/gitlab/issues/1710#note_262760589
• How do you force HTTPS redirection on Ambassador: you use a nginx sidecar
• How do you force static HTTP responses (401, for example) on Ambassador: you use a nginx sidecar

juniorz

1.16

• Deprecation of kubernetes.io/role label.

  • Action: Replace with role.node.kubernetes.io/role.
  • Consequence: kubectl get node won't show the ROLE column. See: kubernetes/kubernetes#84912 (comment)

• Deprecation of API versions.

  • Action: Use https://github.com/rikatz/kubepug to find problematic API versions in your cluster.
  • Action: Change all manifests to the new API version.

• Action: Make sure helm charts release state also have the manifests with the new API version.

juniorz

computer programs are the tangible output of a thought process - the conversion of a thought process into a product.

Edward H. Bersoff, "Elements of Software Configuration Management"

software testing alone does not produce or ensure good software -- it only gives an indication of error frequency that can be expected and [...] verification only shows correspondence to functional requirements.

Joseph P. Cavano and James A. McCall, "A Framework for the Measurement of Software Quality"

juniorz

Termos

• the one stop shop for: Posto Ipiranga
• ballpark figure: chute
• inside baseball: panelinha

Pronuncia

• silent: https://www.merriam-webster.com/video/why-is-there-a-c-in-indict
• affect / effect

juniorz

1. Install Envoy (and Istio proxy) dependencies
   1. https://github.com/envoyproxy/envoy/blob/master/bazel/README.md
   2. https://github.com/istio/proxy/blob/3781be0e624470a4ee613c4ffc9816976f5dd701/.circleci/config.yml#L95
      1. Install XCode
      2. sudo xcode-select -s /Applications/Xcode.app/Contents/Developer; sudo xcodebuild -license; bazel clean --expunge; See: bazelbuild/bazel#6056 (comment)
   3. https://www.envoyproxy.io/docs/envoy/latest/install/building#requirements
2. Configure the dev environment
   1. https://github.com/istio/istio/wiki/Preparing-for-Development#setting-up-environment-variables
3. https://medium.com/@nadundesilva/building-istio-from-source-on-linux-be860d660aa7

juniorz

Certified Kubernetes Administrator (CKA)

Curriculum v1.14.1

Source: https://github.com/cncf/curriculum/blob/master/CKA_Curriculum_V1.14.1.pdf

Core Concepts (19%)

Understand the Kubernetes API primitives

juniorz

Unlock Telepatria vtelca v865m movilnet

12345678 (was the initial code)

##3646633## (engineering mode) Simme Lock Network Personalization Unlock permanently

juniorz

Kubernetes based/native CI/CD

Prow

• https://github.com/kubernetes/test-infra/blob/master/prow/README.md
• https://jenkins-x.io/architecture/prow/
• https://www.youtube.com/watch?v=DBrkSC6nS8A

Components

juniorz

YMMV

juniorz

# OTR-over-TCP chat-roulette

This is an example of how OTR can be used outside of XMPP

Installing instructions

How to start a server

curl https://gist.github.com/juniorz/9ae1d1f38fc24a2cb051/raw/server.go -O