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First we need to obtain a certificate

Generate an RSA private key

openssl genpkey -algorithm RSA -pkeyopt rsa_keygen_bits:keysize -out file

If an encrypted key is desired, use the -aes-256-cbc option.

Generate a certificate signing request

openssl req -new -sha256 -key private_key -out filename

Generate a self-signed certificate

openssl req -key private_key -x509 -new -days days -out filename

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Arch Linux Installation guide

Update the system clock

timedatectl set-ntp true

To check the service status, use timedatectl status

Optional

timedatectl set-timezone America/Los_Angeles

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{
  "api-cors-header": "",
  "authorization-plugins": [],
  "bip": "",
  "bridge": "",
  "cgroup-parent": "",
  "cluster-store": "",
  "cluster-store-opts": {},
  "cluster-advertise": "",
  "debug": true,

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Problem

I have two Github accounts: oanhnn (personal) and superman (for work). I want to use both accounts on same computer (without typing password everytime, when doing git push or pull).

Solution

Use ssh keys and define host aliases in ssh config file (each alias for an account).

How to?

1. Generate ssh key pairs for accounts and add them to GitHub accounts.

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Cleanup docker images and containers after failed builds

Sometimes, there are some untagged images left behind after failed builds. In order to get rid of those, this script can be used.

#!/bin/bash
docker rm $(docker ps -aq)
docker rmi $(docker images | grep "^<none>" | awk '{print $3}')

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version: '3'

volumes:
        wordpress:
        db:

services:
        wordpress:
                image: wordpress:5.7.1-fpm-alpine
                container_name: ${WP_CONTAINER_NAME}

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{"lastUpload":"2021-12-04T06:29:50.248Z","extensionVersion":"v3.4.3"}

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Setup multiple git identities & git user informations

/!\ Be very carrefull in your setup : any misconfiguration make all the git config to fail silently ! Go trought this guide step by step and it should be fine 😉

Setup multiple git ssh identities for git

• Generate your SSH keys as per your git provider documentation.
• Add each public SSH keys to your git providers acounts.
• In your ~/.ssh/config, set each ssh key for each repository as in this exemple:

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{
    # us-east-1
    "3.231.2.0/25"
    "3.234.232.224/27",
    "3.236.169.192/26",
    "3.236.48.0/23",
    "34.195.252.0/24",
    "34.226.14.0/24",

    # us-east-2

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Using terraform for_each and toset instead of count

Using terraform count and the pain of working with it

If you're using terraform extensively you probably ran into an issue like this.

This is a synthetic example but I still hope the problem is recognizable as something that also happens out in the wild.

First, you have a list variable (in terraform.tfvars)