duboisf

Multi-architecture docker builds on Linux

Install binfmt if ls /proc/sys/fs/binfmt_misc/qemu* returns nothing:

docker run --privileged --rm tonistiigi/binfmt --install all

Verify that it worked, you should see stuff by running ls /proc/sys/fs/binfmt_misc/qemu*

duboisf

#!/bin/bash

# This script diffs the content of two container images
# USAGE: ./diff-container-images.sh <registry>/<repo> <tag1> <tag2>

# strict mode
set -euo pipefail

registry_repo=$1
tag1=$2

duboisf

mkfifo /tmp/pcap.fifo
# Note: DO NOT use the -it option with exec!
kubectl exec deploy/some-pod -c istio-proxy -- bash -c "sudo tcpdump -s0 -U -n -i eth0 -w - " > /tmp/pcap.fifo
wireshark -k -i /tmp/pcap.fifo

duboisf

I keep tripping up because I forget to add --hidden and use * instead of **:

rg --hidden --glob='**/.github/**' <PATTERN>

duboisf

With the kitty terminal, you can send desktop notifications with the following (example taken from the kitty docs):

printf '\x1b]99;i=1:d=0;Hello world\x1b\\'
printf '\x1b]99;i=1:d=1:p=body;This is cool\x1b\\'

For details about how this works is here.

duboisf

Small app to detect and show fixed Nerfont moved codepoints

I wrote versions in golang and rust.

With golang it was a walk in the park but I've writen a lot of go.

I just started learning rust and oh boy did I struggle 😅

nushell script to watch for changes

duboisf

export def --wrapped aws [...rest]: nothing -> list<any> {
    if ($rest | last) == "help" {
        ^aws ...$rest
    } else {
        ^aws --output json ...$rest | from json | get-first
    }
}

export def "get-first" []: record -> any {
    let input = $in

duboisf

Getting machines from all clusters in nushell

I'm migrating karpenter to version v0.32.x and I need to verify if there are some machines left that might not have been migrated to nodepools.

Note

I have a none context that I select to "turn off" kubectl. I need to filter it out. To create this context, I used the following command: kubectl config set-context none

let machines = ^kubectl config view

duboisf

Get all AWS VPCs, for all accounts, in all regions, in nushell

The cool thing about this script is that it uses par-each to run the aws commands in parallel and collecting the results. Do you know how hard that is to do in bash?!

Warning

This script assumes that you have 1 profile entry for each AWS account of the form <account alias>/aws-read-only. Adapt as needed.

aws configure list-profiles | grep aws-read-only | lines | par-each {|profile|

duboisf

#!/bin/bash

# Strict mode
set -euo pipefail

if [ $# -ne 3 ]; then
    echo "Usage: $0 <helm_release_name> <old_api_version> <new_api_version>"
    exit 1
fi