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PythonAdvent Calendar 2013

Day 4

LXCをPythonから操作する

Last updated at Posted at 2013-12-04

##概要
vagrantでubuntu13.10をインストールして、その上でテストしました。

まずはPython3.3のインストール

sudo apt-get install libsqlite3-dev
sudo apt-get install sqlite3 # for the command-line client
sudo apt-get install bzip2 libbz2-dev

wget http://python.org/ftp/python/3.3.3/Python-3.3.3.tar.bz2
tar jxf Python-3.3.3.tar.bz2
./configure --prefix=/opt/python3.3
make
sudo make install

sudo ln -s /opt/python3.3/bin/python3.3 /usr/bin/python

wget https://bitbucket.org/pypa/setuptools/raw/bootstrap/ez_setup.py
sudo python3.3 ez_setup.py
sudo easy_install pip

LXCのインストール

sudo apt-get -y install lxc
sudo apt-get -y install lxctl

PythonのインタプリタからLXCの仮想コンテナを操作してみる

sudo python3
import lxc
c=lxc.Container("C")
c.create("ubuntu")

# 成功すると最後にこのようなメッセージが出ます。
# モジュールのインストールで途中で失敗したらcreateからやり直せば成功します。
Processing triggers for ureadahead ...
Can not write log, openpty() failed (/dev/pts not mounted?)
Setting up libdrm2:i386 (2.4.46-1ubuntu1) ...
Setting up libprocps0:i386 (1:3.3.3-2ubuntu9) ...
Setting up libudev1:i386 (204-0ubuntu19) ...
Setting up udev (204-0ubuntu19) ...
invoke-rc.d: policy-rc.d denied execution of restart.
Removing 'diversion of /bin/udevadm to /bin/udevadm.upgrade by fake-udev'
update-initramfs: deferring update (trigger activated)
Setting up initramfs-tools-bin (0.103ubuntu1.1) ...
Setting up initramfs-tools (0.103ubuntu1.1) ...
update-initramfs: deferring update (trigger activated)
Setting up procps (1:3.3.3-2ubuntu9) ...
invoke-rc.d: policy-rc.d denied execution of start.
Setting up openssh-client (1:6.2p2-6ubuntu0.1) ...
Setting up openssh-server (1:6.2p2-6ubuntu0.1) ...
invoke-rc.d: policy-rc.d denied execution of restart.
Setting up ssh (1:6.2p2-6ubuntu0.1) ...
Processing triggers for libc-bin ...
Processing triggers for initramfs-tools ...
Download complete
Copy /var/cache/lxc/saucy/rootfs-i386 to /usr/lib/i386-linux-gnu/lxc ... 
Copying rootfs to /usr/lib/i386-linux-gnu/lxc ...
Generating locales...
  en_US.UTF-8... up-to-date
Generation complete.
Creating SSH2 RSA key; this may take some time ...
Creating SSH2 DSA key; this may take some time ...
Creating SSH2 ECDSA key; this may take some time ...
invoke-rc.d: policy-rc.d denied execution of start.

##
# The default user is 'ubuntu' with password 'ubuntu'!
# Use the 'sudo' command to run tasks as root in the container.
##

# コンテナを起動する
c.start()

# 設定ファイルの場所
c.config_file_name
'/var/lib/lxc/C/config'

# コンテナの一覧
lxc.list_containers()
['C']

# 設定の書き込み
c.append_config_item("lxc.network.ipv4", "192.168.1.10/24")
c.append_config_item("lxc.network.ipv4.gateway", "192.168.1.1")
c.save_config()

# IPアドレス確認
c.get_ips()

# コンソールにアタッチする。
c.console()

このようなログインシェルが立ち上がります。

  Ubuntu 13.10 C tty1

  C login: 
  Password: 

ユーザー名とパスワードはubuntuです。
Ctrl-a qでpythonインタープリタに戻ります。

以下、インタープリタの続き。


# クローンを作成する。
clone = lxc.Container("CLONE_NAME")
clone.clone(c)
clone.start()
clone.stop()
clone.destroy()

# 破棄して終了
c.destroy()

もう少し詳しいサンプルはこちらに載っていますので、是非参考に。
https://github.com/lxc/lxc/blob/master/src/python-lxc/examples/api_test.py

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