redbearder

Find the dependent child images on Docker

When you try to remove the docker image with the following command

docker rmi 6795374be8c1

Sometimes you might be facing below error:

Error response from daemon: conflict: unable to delete 6795374be8c1 (cannot be forced) - image has dependent child images

Below is the Docker command line used to find the dependent child images

指标参考下面几个内容整理。

basic-perfomance
tsar https://github.com/alibaba/tsar/blob/master/info.md#io
netflixs http://techblog.netflix.com/2015/04/introducing-vector-netflixs-on-host.html
openfalcon http://book.open-falcon.com/zh/faq/linux-metrics.html

含义参考了: 对应的 manpage, kernel doc。

系统监控

Decrypting `ipsw`

Original source: https://github.com/0xced/iOS-Artwork-Extractor/wiki/Extracting-more-artwork

You can extract even more artwork if you decrypt and mount an iOS firmware (.ipsw file).

Requirements

ipsw_decrypt.py
Python 3.2 (required by ipsw_decrypt.py)

Configure Git to use a proxy

In Brief

You may need to configure a proxy server if you're having trouble cloning or fetching from a remote repository or getting an error like unable to access '...' Couldn't resolve host '...'.

Consider something like:

GPG 加密解密简明教程

大家都知道，互联网上充斥着大量的明文传输方式，可以说绝对是不安全地带。那么，我们如何保证在不安全的互联网中更可靠的传输重要数据呢？个人认为最好的方式之一就是使用 GPG 工具进行加密。此文只是简单介绍了 GPG 的常规用法，重在推广和普及 GPG 加密工具，详细的使用请参见 GPG 手册。

名词解释

RSA / DSA / ElGamal : 是指加密算法

GPG :（全称 GnuPG ) 是一款非对称加密(PGP)的免费软件，非对称加密方式简单讲就是指用公钥加密文件，用私钥解密文件。如果你想给谁发送加密信息，首先你要得到他的公钥，然后通过该公钥加密后传给他，对方利用自已的私钥就可解密并读取文件了。

	# note these instructions are as of Dec 28, 2015

	# the vlc and vlckit repos are super complex and have thousands of dependencies from everywhere on the internet.
	# so, you'll need to mess with things a bit

	git clone http://code.videolan.org/videolan/VLCKit.git
	cd VLCKit

	./buildMobileVLCKit.sh -t

	#!/bin/sh
	# Copyright (C) Pierre d'Herbemont, 2010
	# Copyright (C) Felix Paul Kühne, 2012-2015

	set -e

	BUILD_DEVICE=yes
	BUILD_SIMULATOR=yes
	BUILD_STATIC_FRAMEWORK=no
	BUILD_STATIC_FRAMEWORK_TV=no

	#!/bin/sh
	# Copyright (C) Pierre d'Herbemont, 2010
	# Copyright (C) Felix Paul Kühne, 2012-2015

	set -e

	BUILD_DEVICE=yes
	BUILD_SIMULATOR=yes
	BUILD_STATIC_FRAMEWORK=no
	SDK=`xcrun --sdk iphoneos --show-sdk-version`

	package main

	import (
	"archive/tar"
	"compress/gzip"
	"flag"
	"fmt"
	"io"
	"os"
	)

	##############################
	## Java
	##############################
	.mtj.tmp/
	*.class
	*.jar
	*.war
	*.ear
	*.nar
	hs_err_pid*