LozanoMatheus

#!/bin/bash
# bash generate random alphanumeric string
#

# bash generate random 32 character alphanumeric string (upper and lowercase) and 
NEW_UUID=$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1)

# bash generate random 32 character alphanumeric string (lowercase only)
cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1

LozanoMatheus

#!/usr/bin/env bash +x

## Do you need to test your exposed app but you don't have curl/wget/* installed?

## The ":" is a built-in command and it works similar to true. Let's say, ":" is more portable than "true"
## Simple and easy
:> /dev/tcp/localhost/22

## Why using timeout? If any side has a firewall and it's dropping the packages, the request will take ~80 seconds to get the timeout.

LozanoMatheus

#!/usr/bin/env sh

LINUX_DISTRO="$(. /etc/os-release ; echo ${ID})"
BASH_VERSION="bash-5.0"
SOURCE_DIR="/var/opt/"

prereqs_centos(){
  install_bash
  yum install -y -q gcc make &> /dev/null
  yum clean all &> /dev/null

LozanoMatheus

#!/usr/bin/env bash

RELATIVE_PATH="${0}"
RELATIVE_DIR_PATH="$(dirname "${0}")"
FULL_DIR_PATH="$(realpath "${0}" | xargs dirname)"
FULL_PATH="$(realpath "${0}")"

echo "RELATIVE_PATH->${RELATIVE_PATH}<-"
echo "RELATIVE_DIR_PATH->${RELATIVE_DIR_PATH}<-"
echo "FULL_DIR_PATH->${FULL_DIR_PATH}<-"

LozanoMatheus

#!/usr/bin/env bash

declare -r  MONTH="${1:-"$(date +'%m')"}"
declare -r  MY_TOGGL_TOKEN="${MY_TOGGL_TOKEN?"Variable MY_TOGGL_TOKEN not declared"}"
declare -r  UTC_NEW="$(TZ=UTC date +'%I')"
declare -ri MY_TIME=$(date +'%H')
declare -ri TZ_DIFF="$(( ${MY_TIME/0} - ${UTC_NEW/0} ))"

## How-to get the Project ID (wid): https://github.com/toggl/toggl_api_docs/blob/master/chapters/projects.md
declare -r PROJECT_ID="${PROJECT_ID?"Variable PROJECT_ID not declared"}"

LozanoMatheus

Deployment
Ingress
CronJob
Service
ServiceMonitor
ConfigMap
Secret

LozanoMatheus

#!/usr/bin/env bash

## Get the primary and secundary IPs
awk '/\|--/ && !/\.0$|\.255$/ {print $2}' /proc/net/fib_trie

## Get only the primary IPs
awk '/32 host/ { print i } {i=$2}' /proc/net/fib_trie

LozanoMatheus

aws ssm start-session --target ${Instance_Id}

## or

ssh ${Instance_Id}

LozanoMatheus

## A basic set up of ~/.ssh/config in your local machine/client
## ssh i-0a1b2c3d4e5f6g7h8i9

Host i-*
  User ec2-user
  ProxyCommand bash -c "aws  ssm start-session --target %h --document-name AWS-StartSSHSession --parameters 'portNumber=%p'"
  IdentityFile ~/.aws/test-mlozano001.pem


## In this case, it will search for a running instance that has the Tag:Name set to example-ssh-via-aws-ssm

LozanoMatheus

## Cleaning Docker images, networks, volumes, etc

function flush_docker() {
  [[ "${1}" == "all" ]] && local delete_docker_volumes="--volumes"
  docker system df
  docker rm -f $(docker ps -qa) &> /dev/null
  Docker_Prune_All="$(docker system prune --all ${delete_docker_volumes} --force)"
  tail -1 <<< "${Docker_Prune_All}"
}