Dockerfile基本結構

Dockerfile 由一行行命令語句組成，并且支持以 # 開頭的注釋行。

一般的，Dockerfile 分為四部分：基礎鏡像信息、維護者信息、鏡像操作指令和容器啟動時執(zhí)行指令。

例如

# This dockerfile uses the ubuntu image
# VERSION 2 - EDITION 1
# Author: docker_user
# Command format: Instruction [arguments / command] ..

# Base image to use, this must be set as the first line
FROM ubuntu

# Maintainer: docker_user <docker_user at email.com> (@docker_user)
MAINTAINER docker_user docker_user@email.com

# Commands to update the image
RUN echo "deb http://archive.ubuntu.com/ubuntu/ raring main universe" >> /etc/apt/sources.list
RUN apt-get update && apt-get install -y nginx
RUN echo "\ndaemon off;" >> /etc/nginx/nginx.conf

# Commands when creating a new container
CMD /usr/sbin/nginx

其中，一開始必須指明所基于的鏡像名稱，接下來推薦說明維護者信息。

后面則是鏡像操作指令，例如 RUN 指令，RUN 指令將對鏡像執(zhí)行跟隨的命令。每運行一條 RUN 指令，鏡像添加新的一層，并提交。

最后是 CMD 指令，來指定運行容器時的操作命令。

下面是一個更復雜的例子

# Nginx
#
# VERSION               0.0.1

FROM      ubuntu
MAINTAINER Victor Vieux <victor@docker.com>

RUN apt-get update && apt-get install -y inotify-tools nginx apache2 openssh-server

# Firefox over VNC
#
# VERSION               0.3

FROM ubuntu

# Install vnc, xvfb in order to create a 'fake' display and firefox
RUN apt-get update && apt-get install -y x11vnc xvfb firefox
RUN mkdir /.vnc
# Setup a password
RUN x11vnc -storepasswd 1234 ~/.vnc/passwd
# Autostart firefox (might not be the best way, but it does the trick)
RUN bash -c 'echo "firefox" >> /.bashrc'

EXPOSE 5900
CMD    ["x11vnc", "-forever", "-usepw", "-create"]

# Multiple images example
#
# VERSION               0.1

FROM ubuntu
RUN echo foo > bar
# Will output something like ===> 907ad6c2736f

FROM ubuntu
RUN echo moo > oink
# Will output something like ===> 695d7793cbe4

# You?ll now have two images, 907ad6c2736f with /bar, and 695d7793cbe4 with
# /oink.