zulhfreelancer

apiVersion: v1
kind: Namespace
metadata:
  name: dummy-exporter
---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: dummy-exporter

zulhfreelancer

Problem

How to list all root keys in YAML file using yq v4 CLI?

Solution

yq4 is my terminal alias for yq above

Let's print all the root keys if they have enabled sub-key e.g.

zulhfreelancer

#!/bin/bash

# This script is for Mac OSX users. If you are on Linux, replace 'gxargs' with 'xargs'.
# To install 'gxargs' command using Homebrew, run 'brew install findutils' first.

# Without parallel (ideal for small number of pods)
kubectl get pods --all-namespaces | grep Evicted | awk '{print $2 " --namespace=" $1}' | gxargs -n 1 -d '\n' bash -c 'kubectl delete pod $0 $1 --force'

# With parallel (ideal for big number of pods)
# To install 'parallel' command using Homebrew, run 'brew install parallel' first.

zulhfreelancer

How to view/extract a specific/current context kubeconfig?

If you have multiple Kubernetes contexts (list them by kubectl config get-contexts) and you want to view or extract the kubeconfig just for current/selected context, you can use one of the following command:

$ kubectl config view --minify --flatten

OR

zulhfreelancer

#!/bin/bash

# Step 1 - Install Tailscale
sudo apt-get install apt-transport-https && \
curl -fsSL https://pkgs.tailscale.com/stable/raspbian/buster.gpg | sudo apt-key add - && \
curl -fsSL https://pkgs.tailscale.com/stable/raspbian/buster.list | sudo tee /etc/apt/sources.list.d/tailscale.list && \
sudo apt-get update && \
sudo apt-get install -y tailscale && \
sudo tailscale up

zulhfreelancer

# Method #1
whois $(whois $(curl -s icanhazip.com) | grep origin | awk '{print $2}') | grep -i descr | cut -d: -f2- | tail -n1 | xargs

# Method #2
whois $(whois $(curl -s icanhazip.com) | grep origin | awk '{print $2}') | grep -i 'org-name\|orgname' | cut -d: -f2- | tail -n1 | xargs

# Method #3
whois $(curl -s icanhazip.com) | grep -i 'org-name\|orgname' | cut -d: -f2- | tail -n1 | xargs

zulhfreelancer

#!/bin/bash
vcgencmd measure_temp
vcgencmd get_throttled
sysbench --test=cpu --cpu-max-prime=20000 --num-threads=4 run >/dev/null 2>&1
vcgencmd measure_temp
vcgencmd get_throttled
sysbench --test=cpu --cpu-max-prime=20000 --num-threads=4 run >/dev/null 2>&1
vcgencmd measure_temp
vcgencmd get_throttled
sysbench --test=cpu --cpu-max-prime=20000 --num-threads=4 run >/dev/null 2>&1

zulhfreelancer

# Require 'jq'
# https://stedolan.github.io/jq/

helm list -A -o json | jq -r '.[] | .name + " " + .namespace' | xargs -n2 sh -c 'helm uninstall $1 -n $2' sh

zulhfreelancer

# +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
# IMPORTANT
# Make sure you already create an ingress rule for the port that you want to open in Oracle Cloud virtual firewall aka
# "Security Lists". This tutorial might be useful for you:
# ---> https://youtu.be/1AIXULHjabQ
# +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

# SSH into the instance
$ ssh <username>@<ip_address>

zulhfreelancer

Git: how to count number of uncommited files?

$ git status -uall --porcelain | wc -l