caffeinetiger’s gists

caffeinetiger / get_aws_rds_aurora_version_mysql_and_postgresql.sql

Created February 24, 2022 07:31

Original post [here](https://aws.amazon.com/premiumsupport/knowledge-center/aurora-version-number/)

	select AURORA_VERSION();
	select @@aurora_version;
	show variables like '%version';

caffeinetiger / creating_symlinks.sh

Last active April 18, 2022 18:19

Commands taken from [this post](https://linuxhint.com/symlink-a-directory-in-linux/)

	#!/bin/bash

	# Symlink a file
	ln -s [path of the target file] [symbolic name]

	# example
	ln -s my_folder/my_doc.txt my_document

	# Symlink a directory
	ln -s source_folder destination_folder

caffeinetiger / 23-Advanced-kubectl-commands.md

Last active April 18, 2022 18:19

Original article [here](https://faun.pub/kubectl-commands-cheatsheet-43ce8f13adfb)

Updated: Dec 21, 2020

I’ve personally used these commands to debug in production. I also used GUI methods like k9s and lenses.io.

0. Impersonate a user and group

kubectl get pods --as-group="somecompany:somecompany-teamname" --as="test"

caffeinetiger / horizontal_pod_autoscaling.sh

Last active April 18, 2022 18:19

[Official kubernetes documentation](https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale-walkthrough/)

	#!/bin/bash

	kubectl autoscale deployment <name-of-deployment> --cpu-percent=75 --min=2 --max=10

caffeinetiger / switch_openjdk_version.sh

Last active April 18, 2022 18:17

[Original blog post - Switching Java (JDK) Versions on MacOS](https://medium.com/@devkosal/switching-java-jdk-versions-on-macos-80bc868e686a)

	#!/bin/bash

	# List installed JDK versions
	/usr/libexec/java_home -V

	# Export in current session
	export JAVA_HOME=`/usr/libexec/java_home -v <version>`

	# Create a function in .bashrc, .zshrc, .zshenv, etc
	function switch_openjdk_version() {

caffeinetiger / docker_multi_platform_building.sh

Last active April 18, 2022 18:17

To use this snippet you will enable the Docker buildx feature which is currently “experimental”. To do so, open up Docker Desktop then navigate to Preferences. Once you’re there, select “Experimental Features” and toggle the slider to on. Click on “A

	#!/bin/bash

	# List available platforms for building
	docker buildx ls

	# Create multiple builder instances to build multi-platform with build command
	docker buildx create --use
	docker buildx build --platform linux/amd64,linux/arm64 --push -t membermatters/membermatters .

	# Build for single platform

caffeinetiger / scale_replicas_to_zero.sh

Last active April 18, 2022 18:17

[Stackoverflow - how to stop/pause a pod in kubernetes](https://stackoverflow.com/questions/54821044/how-to-stop-pause-a-pod-in-kubernetes)

	#!/bin/bash

	kubectl scale --replicas=0 deployment/<your-deployment>

caffeinetiger / prune_unused_docker_images.sh

Last active April 18, 2022 18:17

[Official documentation for docker image prune](https://docs.docker.com/engine/reference/commandline/image_prune/)

	#!/bin/bash

	# Prune all unused images
	docker image prune --all

	# The filtering flag (--filter) format is of “key=value”. If there is more than one filter, then pass multiple flags
	docker image prune --filter "foo=bar"
	# For more details on the filter flag option see official documentation mentioned in the description

	# Prune all unused images with no confirmation

caffeinetiger / retagging_ecr_image.sh

Last active April 18, 2022 18:16

There is no user friendly way to retag an image in the AWS ECR Web Console. You need to use AWS CLI commands to accomplish this. - [Official AWS Documentation](https://docs.aws.amazon.com/AmazonECR/latest/userguide/image-retag.html) - [Stackoverflow

	#!/bin/bash

	# Get image manifest by tag
	MANIFEST=$(aws ecr batch-get-image --repository-name amazonlinux --image-ids imageTag=latest --output json \| jq --raw-output '.images[0].imageManifest')
	# Or
	# Get image manifest by digest (this is found on the ECR repo page in the AWS Web Console)
	MANIFEST=$(aws ecr batch-get-image --repository-name amazonlinux --image-ids imageDigest=sha256:8e080763aa56a2d509f9614613019ff0d9fe9cfd651b2efdb8961356c9ea6e26 --query 'images[].imageManifest' --output text)

	# Update image with new tag
	aws ecr put-image --repository-name amazonlinux --image-tag previous.2018 --image-manifest "$MANIFEST"

caffeinetiger / pip_install_requirements.sh

Created November 18, 2021 05:00

Saved from https://stackoverflow.com/questions/7225900/how-can-i-install-packages-using-pip-according-to-the-requirements-txt-file-from

	#!/bin/bash

	set -x

	pip install -r /path/to/requirements.txt

Tony Benavides caffeinetiger

0. Impersonate a user and group