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$ docker history imagename
IMAGE               CREATED             CREATED BY                SIZE
f770fc671f11        12 seconds ago      apt-get install -y curl   21.3 MB
28445c70c2b3        39 seconds ago      apt-get install ping      11.57 MB
8dbd9e392a96        7 months ago                                  131.5 MB

$ docker tag 2844 imagename   # <-- that's the secret right there

$ docker history imagename
IMAGE               CREATED             CREATED BY             SIZE

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That’s one of the real strengths of Docker: the ability to go back to a previous commit. The secret is simply to docker tag the image you want.

Here’s an example. In this example, I first installed ping, then committed, then installed curl, and committed that. Then I rolled back the image to contain only ping:

$ docker history imagename
IMAGE               CREATED             CREATED BY                SIZE
f770fc671f11        12 seconds ago      apt-get install -y curl   21.3 MB
28445c70c2b3        39 seconds ago      apt-get install ping      11.57 MB
8dbd9e392a96        7 months ago                                  131.5 MB

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def set_env_var(env_var):
   old_volume = "/path"
   destroy old container
   create new container with env_var

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Linux fun-o-matic

How to have some fun using the terminal.

1. Install cowsay [0] via : sudo apt-get install cowsay
2. Install fortune [1] via : sudo apt-get install fortune
3. Make sure you have Ruby installed via : ruby -v
4. Install the lolcat [2] via : gem gem install lolcat
5. Profit!

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Install ChromiumOS

1. Get Chromium OS from one of the following places
   1. Download the vanilla build (old but stable): http://chromeos.hexxeh.net/
      1. NOTE: Password is facepunch
   2. Download the nightly build (sync doesn't work): http://download-chromiumos.appspot.com/
      1. NOTE: If you want developer mode, you must change _base_ in the download URL to _test_ as the base image does not have developer tools enabled
      2. NOTE: Password is unknown, instructions for working around this are provided later
      3. NOTE: I could not get syncing working with this build, perhaps due to no API KEYS being provided???
2. NOTE: I could not move past the welcome screen on the 64bit build due to no network being found (32bit worked)

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@@ -28,7 +28,7 @@
 ### Set diff-cmd to the absolute path of your 'diff' program.
 ###   This will override the compile-time default, which is to use
 ###   Subversion's internal diff implementation.
-# diff-cmd = diff_program (diff, gdiff, etc.)
+diff-cmd = colordiff
 ### Set diff3-cmd to the absolute path of your 'diff3' program.
 ###   This will override the compile-time default, which is to use
 ###   Subversion's internal diff3 implementation.

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#coding=utf8
import itchat
# tuling plugin can be get here:
# https://github.com/littlecodersh/EasierLife/tree/master/Plugins/Tuling
from tuling import get_response

@itchat.msg_register('Text')
def text_reply(msg):
    if u'作者' in msg['Text'] or u'主人' in msg['Text']:
        return u'你可以在这里了解他：https://github.com/littlecodersh'

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# 0 is too far from ` ;)
set -g base-index 1

# Automatically set window title
set-window-option -g automatic-rename on
set-option -g set-titles on

#set -g default-terminal screen-256color
set -g status-keys vi
set -g history-limit 10000

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from concurrent.futures import ThreadPoolExecutor
from functools import partial, wraps
import time

import tornado.ioloop
import tornado.web


EXECUTOR = ThreadPoolExecutor(max_workers=4)

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#!/usr/bin/env python
# -*- coding: utf-8 -*-

import urllib2

gh_url = 'https://api.github.com'

req = urllib2.Request(gh_url)

password_manager = urllib2.HTTPPasswordMgrWithDefaultRealm()