Docker 是最近相当热门的一个名词，它是一个基于 Linux Container 的轻量化的虚拟技术，而微软也相当积极与 Docker 合作，在 Azure 上支持这个火热的技术，并且提供简单的方式来建立 Docker Host，本文将会介绍如何在 Azure 上使用 Docker。
Docker 简介
Docker 是一个开源的项目，主要的特点是能将应用程序包装在一个 LXC (Linux Container) 容器中，当这些应用被包装进容器后，部署、迁移都变得更为简单。与传统的虚拟化技术相比，虚拟机需要安装操作系统才能执行应用程序，而 Container 则不需要安装操作系统就能运行应用程序。Container 技术是一种在 操作系统内的 Kernel 层所打造虚拟运行环境，所以 Container 彼此之间共享了 Host OS 的 Kernel，但通过namespace 区分来达到隔离每个容器的目的。
本文并不会针对 Docker 这个技术做深入的介绍，主要着重在 Azure 对于 Docker 所提供的支持做介绍,详细了解可以参考 Docker 入门教程。
在 Azure 上建立 Docker Host
Docker 可以运行在 Linux 操作系统之下，所以如果要在 Azure 上使用 Docker，您也可以自行建立一个Linux VM，并在上面安装 并运行Docker Deamon 。而微软在正式宣布与 Docker 密切合作后，推出了对 Docker 的直接支持，CentOS 7 中 Docker 的安装
Docker 软件包已经包括在默认的 CentOS-Extras 软件源里。因此想要安装 docker，只需要运行下面的 yum 命令：
[[email protected] ~]# yum install docker
启动 Docker 服务
[[email protected] Mono ~]# systemctl start docker.service
[[email protected] Mono ~]# systemctl enable docker.service
下载官方的 CentOS 镜像到本地
[[email protected] ~]# docker pull centos
centos:latest: The image you are pulling has been verified
511136ea3c5a: Pull complete
5b12ef8fd570: Pull complete
34943839435d: Pull complete
Status: Downloaded newer image for centos:latest
确认 CentOS 镜像已经被获取：
[[email protected] ~]# docker images centos
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
centos latest 34943839435d 13 days ago 224 MB
运行一个 Docker 容器：
[[email protected] ~]# docker run -i -t centos /bin/bash
[[email protected] /]# ls /etc
BUILDTIME group nsswitch.conf rpm
DIR_COLORS group- openldap sasl2
DIR_COLORS.256color gshadow opt securetty
DIR_COLORS.lightbgcolor gshadow- os-release security
GREP_COLORS gss pam.d selinux
X11 host.conf passwd services
aliases hostname passwd- shadow
alternatives hosts pkcs11 shadow-
bash_completion.d hosts.allow pki shells
bashrc hosts.deny pm skel
binfmt.d init.d popt.d ssl
centos-release inputrc prelink.conf.d sysconfig
chkconfig.d iproute2 printcap sysctl.d
cron.daily issue profile system-release
cron.hourly issue.net profile.d system-release-cpe
csh.cshrc krb5.conf protocols systemd
csh.login ld.so.conf rc.d terminfo
dbus-1 ld.so.conf.d rc0.d tmpfiles.d
default libaudit.conf rc1.d udev
dracut.conf.d libuser.conf rc2.d virc
environment localtime rc3.d xdg
exports login.defs rc4.d xinetd.d
filesystems logrotate.d rc5.d yum
fstab magic rc6.d yum.conf
gcrypt modules-load.d redhat-release yum.repos.d
gnupg motd resolv.conf
groff mtab rpc
我们可以看到，CentOS 容器已经被启动，并且我们得到了 bash 提示符。在 docker 命令中我们使用了 "-i 捕获标准输入输出"和 "-t 分配一个终端或控制台"选项。若要断开与容器的连接，输入 exit。
[[email protected] /]# exit
Exit
我们还可以搜索基于 mono的容器。 发现已经有非常多的mono容器，我们开始玩docker mono。
[[email protected] ~]# docker search mono
NAME DESCRIPTION STARS OFFICIAL AUTOMATED
mono Mono is an open source implementation of M... 24 [OK]
akoeplinger/mono-aspnetvnext Image containing everything needed to play... 14 [OK]
monokrome/wine 4 [OK]
monokrome/node 3 [OK]
friism/mono 2 [OK]
benhall/docker-mono Docker file at https://github.com/Ben Hall/... 2
devdiv/ubuntu-mono 1
nacyot/fsharp-mono 1 [OK]
caseyjbenko/docker-mono 1 [OK]
nacyot/csharp-mono 1 [OK]
rexm/mono-docker 1 [OK]
prozachj/docker-mono-aspnetvnext 1 [OK]
clarktlaugh/mono 0 [OK]
marcells/mono 0 [OK]
seif/docker-mono-fastcgi-nginx 0 [OK]
fghedin/docker-mono 0 [OK]
shaunol/mono-owin-webapi 0 [OK]
seif/mono-runit 0 [OK]
timefairy/debian-mono 0 [OK]
shaunol/learning-mono 0 [OK]
rmacdonaldsmith/docker-debian-mono-devel 0 [OK]
misakai/mono Mono and LLVM on Debian 0
bryanayers/centos7-mono-snapshot 0 [OK]
fghedin/docker-mono-hello 0 [OK]
acazau/docker-mono 0 [OK]
andmos/mono Baseimage for Mono-runtime. 0
eflab/mono 0
jbonhag/mono-hosting-wcf 0 [OK]
thachmai/mono-complete 0 [OK]
andrefernandes/docker-mono 0 [OK]
mikehadlow/ubuntu-monoxide-mono-devel 0 [OK]
allunite/mono-base Ubuntu with Mono base image 0
wimperdt/mono-in-docker 0 [OK]
ahmet/docker-mono-build 0 [OK]
pmcgrath/mono 0
allunite/buildimage-mono Drone.io build image for mono apps 0
tomrijntjes/monoculture 0 [OK]
pjvds/mono 0
basecrm/mono 0
monokrome/btsync 0 [OK]
basespace/mono 0
robzhu/mono 0
monokrome/zmq 0 [OK]
bowery/mono 0
wbonner/unity-mono 0
wayneo/mono 0
rwentzel/ubuntu-mono Ubuntu 13.04 with Mono 3.2.3 0
scottrudy/mono 0
haaf/mono-baseline A Mono 3.8 baseline with F# installed . So... 0
monokrome/minecraft 0 [OK]
bryanayers/centos7-mono3.10.0 0 [OK]
tilde/mono 0
junsuzuki/mono 0
virkokka/mono-fsharp Ubuntu 14.04 with mono and F# 0
pcherng/phasingapp-mono-dev 0
bryanayers/centos7-mono3.8.0 0 [OK]
monokrome/gitreceive 0 [OK]
kolektiv/mono 0
octohost/mono 0
leptonix/mono 0
monokrome/azure-cli 0 [OK]
monokrome/renderize 0 [OK]
monokrome/gitolite 0 [OK]
paulbrennan/mono 0
monokrome/sshd 0 [OK]
basespace/centos-mono 0
monokrome/nibbler 0 [OK]
saltosystems/mono-xsp4-app 0
clintonalee/centos6-mono 0
endeavour/nginx-mono 0
monokrome/chat 0 [OK]
armbuild/crosbymichael-mono 0
jpina/centos-mono 0
bjornno/mono-phonebook 0
pcherng/jellyfish-mono 0
petee/centos-mono 0
menziesbenwiles/test-mono 0
nyasara/azurepymono A base ubuntu image with Mono, Azure SDK f... 0 [OK]
allanlei/mono-fastcgi-server2 0
petee/centos-mono-2.10.2 0
nyasara/monobase Adds Azure SDK and IronPython to a mo no image 0
hack13/mono310 opensuse mono 3.10 0
originalsurfmex/monode development sandbox (uses 8080): node , exp... 0
jgarverick/monocent Linux image with Mono framework pre-i nstalled 0
pgrm/mono_baseimage 0
pcherng/puma00-14-07-09-mono 0
jgarverick/monodeb 0
azraelrabbit/monup mono opt for jexus web server 0 [OK]
afilimonov/hcci-solr 0 [OK]
afilimonov/docker-solr 0 [OK]
fireantik/fireantmonodocker 0 [OK]
monolive/centos 0
monofraps/centos65-base 0
callumelgrant/docker-mono-aspnetvnext 0 [OK]
seif/mono Debian based mono container using xam arin ... 0 [OK]
smartprocure/mono 0 [OK]
jamesottaway/mono Mono is an open source implementation of M... 0 [OK]
cuda/mono Mono latest release container based o n Ubu... 0 [OK]
crosbymichael/mono 0 [OK]
derekslager/mono 0 [OK]
shaunol/centos-mono 0 [OK]
matsprea/mono-aspnetvnext Repository with MONO and the Asp.Net vnext... 0 [OK]
djsell/mono 0 [OK]
andystanton/exec-mono 0 [OK]
ndelitski/mono 0 [OK]
[[email protected] ~]#
下载Mono的 docker镜像
[[email protected] ~]# docker pull mono
mono:latest: The image you are pulling has been verified
f10807909bc5: Pull complete
f6fab3b798be: Pull complete
3c43ebb7883b: Pull complete
7a1f8e485667: Pull complete
a342319da8ea: Pull complete
3774d7ea06a6: Pull complete
9da8fc8d2ff5: Pull complete
511136ea3c5a: Already exists
Status: Downloaded newer image for mono:latest
[[email protected] ~]#
使用docker运行mono
[[email protected] ~]# docker run -i -t mono bash
)
[email protected]:/# mono -V
Mono JIT compiler version 3.10.0 (tarball Wed Nov 5 12:50:04 UTC 2014)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
TLS: __thread
SIGSEGV: altstack
Notifications: epoll
Architecture: amd64
Disabled: none
Misc: softdebug
LLVM: supported, not enabled.
GC: sgen
[email protected]:/#