brianpursley

sudo crictl inspect $(sudo crictl ps --name bar -q) | jq '.info.runtimeSpec.linux.resources'
sudo crictl inspect $(sudo crictl ps --name baz -q) | jq '.info.runtimeSpec.linux.resources'

brianpursley

kubectl patch node k8s-worker-1 --subresource=status --type=json -p='[{"op":"remove","path":"/status/capacity/example.com~1fakecpu"}]'
kubectl patch node k8s-worker-1 --subresource=status --type=json -p='[{"op":"remove","path":"/status/capacity/example.com~1fakePTSRes"}]'
kubectl patch node k8s-worker-1 --subresource=status --type=json -p='[{"op":"remove","path":"/status/capacity/scheduling.k8s.io~1foo"}]'

kubectl patch node k8s-worker-2 --subresource=status --type=json -p='[{"op":"remove","path":"/status/capacity/example.com~1fakecpu"}]'
kubectl patch node k8s-worker-2 --subresource=status --type=json -p='[{"op":"remove","path":"/status/capacity/example.com~1fakePTSRes"}]'
kubectl patch node k8s-worker-2 --subresource=status --type=json -p='[{"op":"remove","path":"/status/capacity/scheduling.k8s.io~1foo"}]'

brianpursley

Incorrect limits displayed for multi-container pods

Summary

Pod resource limits are incorrectly calculated in kubectl describe node when all the following conditions are met:

1. The pod has multiple containers (including init containers).
2. At least one container specifies a resource limit.
3. At least one container does not specify a resource limit for a resource type for which another container has specified a resource limit.

brianpursley

{
  "definitions": {
    "org.apache.camel.v1.Integration": {
      "description": "Integration is the Schema for the integrations API",
      "properties": {
        "spec": {
          "description": "the desired Integration specification",
          "properties": {
            "template": {
              "description": "Pod template customization",

brianpursley

Brian Pursley

A sorting network can be represented as a comma-separated list of comparators. A comparator, which compares and swaps two inputs to ensure they are in sorted order, can be represented using the string "a:b", where "a" is the index of the first input, and "b" is the index of the second input. Index numbering starts at 0. Using this notation, create a sorting network that is able to sort three inputs.

---

Chat GPT

Here is a sorting network that can sort three inputs:

"0:1, 1:2"

This sorting network consists of two comparators. The first comparator compares the first and second inputs, and swaps them if they are out of order. The second comparator compares the second and third inputs, and swaps them if they are out of order. This sorting network is able to sort the three inputs because it will ensure that the first input is the smallest, the second input is the second smallest, and the third input is the largest.

brianpursley

using Microsoft.AspNetCore.Authentication.OpenIdConnect;

namespace AuthTest.Extensions;

public static class ServiceCollectionExtensions
{
    // USAGE:
    //
    // 1. Add the following line in Program.cs, after your call to AddMicrosoftIdentityWebApp:
    // builder.Services.AddAlternateSignUpSignInPolicies(builder.Configuration.GetSection("AzureAdB2C"));

brianpursley

#!/bin/sh

kubectl run postgres --image=postgres --env=POSTGRES_PASSWORD=hunter2
kubectl wait --for=condition=Ready pod/postgres

cleanup() {
  echo
  kubectl delete pod postgres --now
}

brianpursley

kubectl create ns nginx-test

kubectl apply --namespace nginx-test -f - << EOF
apiVersion: v1
kind: ConfigMap
metadata:
  name: nginx-config
data:
  default.conf: |
    server {

brianpursley

Most Validate functions take no parameters, and only validate against Options:

~/go/src/k8s.io/kubernetes (master) $ grep -r ./staging/src/k8s.io/kubectl -Pe 'func.*\(.*Options\).Validate\(\)'
./staging/src/k8s.io/kubectl/pkg/cmd/set/set_resources.go:func (o *SetResourcesOptions) Validate() error {
./staging/src/k8s.io/kubectl/pkg/cmd/set/set_selector.go:func (o *SetSelectorOptions) Validate() error {
./staging/src/k8s.io/kubectl/pkg/cmd/set/set_image.go:func (o *SetImageOptions) Validate() error {
./staging/src/k8s.io/kubectl/pkg/cmd/set/set_subject.go:func (o *SubjectOptions) Validate() error {
./staging/src/k8s.io/kubectl/pkg/cmd/set/set_env.go:func (o *EnvOptions) Validate() error {
./staging/src/k8s.io/kubectl/pkg/cmd/proxy/proxy.go:func (o ProxyOptions) Validate() error {
./staging/src/k8s.io/kubectl/pkg/cmd/label/label.go:func (o *LabelOptions) Validate() error {

brianpursley

Creates a pod called echo that listens on port 8080, echoing everything it receives.

kubectl run echo --image=busybox -- nc -lk -p 8080 -e cat

To test it out, you can do this, to listen on local port 8080 and forward all connections to the echo pod:

kubectl port-forward echo 8080:8080