runC and libcontainer on Fedora 23/24

In this post, I will post my notes on how I got runC and then using libcontainer on Fedora. The first step is to install golang:

$ sudo dnf -y install golang
$ go version
go version go1.6 linux/amd64

We will set GOPATH=~/golang/ and then do the following:

$ mkdir ...
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Did your Fedora live cd build fail?

Update: Changed the Koji URL to reflect the change to livemedia

As the Fedora Scientific maintainer, I have to make sure I look into whether the nightly build is failing so that I can look into the why. So far I have been doing that by going to the koji ...

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Replacing boto S3 mocks using moto in Python

Let's say you have some Python application code which connects to Amazon S3 which retrieves the keys in a bucket. Very likely, the application would be using boto and the code would like this:

import boto

def get_s3_conn():
    return boto.connect_s3('<aws-access-key', '<aws-secret-key>')

def list_keys():
    s3_conn = get_s3_conn()
    b = s3_conn ...
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tempfile.NamedTemporaryFile() in Python

In Python, when you need to create a temporary file with a filename associated to it on disk, NamedTemporaryFile function in the tempfile module is the goto function. Here are some use cases that I think one might use it for.

Case #1: You simply need a named empty temporary ...

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Mock objects and non-existent attributes/methods in Python

Updated: Fixed typo in the last paragraph.

Today, I was curious to see this behavior of Mock() objects when using mock:

>>> from mock import Mock
>>> m = Mock()
>>> m.i_dont_exist
<Mock name='mock.i_dont_exist' id='139841609578768'>
>>> m.i_dont_exist()
<Mock name='mock.i_dont_exist()' id='139841609106896'>

The above is expected, since I have ...

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Data only Docker containers

In this post, we shall take a look at the idea of data only containers - containers whose sole purpose is to exist on the docker host so that other containers can have portable access to a persistent data volume.

Why do we need a persistent data volume?

We will experiment ...

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A virtualenv first approach to Python projects

I have until the last few months (of my ~4 years of working with Python) always worked without virtualenv for all my Python projects. Why? I think I found the whole idea of having to do the following two steps before I work on something cumbersome:

  • Remember the exact virtualenv ...
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