總體流程：

獲取centos7映象
為centos7映象安裝ssh
使用pipework為容器配置IP
為centos7映象配置java、hadoop
配置hadoop

1.獲取centos7映象

$ docker pull centos:7

//檢視當前已下載docker映象
$ docker image ls -a 

2.編寫Dockerfile

$ vim Dockerfile

寫入以下內容：

FROM centos
MAINTAINER dys

RUN yum install -y openssh-server sudo
RUN sed -i ‘s/UsePAM yes/UsePAM no/g’ /etc/ssh/sshd_config
RUN yum install -y openssh-clients

RUN echo “root:0225” | chpasswd
RUN echo “root ALL=(ALL) ALL” >> /etc/sudoers
RUN ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key
RUN ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key

RUN mkdir /var/run/sshd
EXPOSE 22
CMD [“/usr/sbin/sshd”,”-D”]

構建映象命令，設定映象名為centos-ssh

$ docker build -t="centos-ssh"
 
 .

$ docker images

3.使用pipework設定容器ip

• 先安裝git客戶端

$ yum -y install git
$ git --version

• git clone pipeword

$ git clone https://github.com/jpetazzo/pipework

$ cd pipework
$ cp pipework /usr/loacl/bin

• 安裝bridge-utils

$ yum -y install bridge-utils

//建立網路
$ brctl addbr br1
$ ip link
 
 set dev br1 up
$ ip addr add 192.168.3.1/24 dev br1

//啟動centos-ssh image
$ docker run -d --name=centos.ssh centos.ssh

//設定ip
$ pipework br1 centos.ssh 192.168.3.20/24

$ ping 192.168.3.20
$ ssh 192.168.3.20

//再建立兩個相同的容器，到此三臺伺服器就搭建好了
$ docker run -d --name=centos7.ssh2 centos-ssh
$ docker run -d --name=centos7.ssh3 centos-ssh

$ pipework br1 centos7.ssh2 192.168.3.22/24
$ pipework br1 centos7.ssh3 192.168.3.23/24

4.為centos7映象配置java、hadoop

$ vim Dockerfile

寫入以下內容：
前提：在Dockerfile所在目錄下準備好 jdk-8u101-linux-x64.tar.gz 與 hadoop-2.7.3.tar.gz

FROM centos-ssh
ADD jdk-8u101-linux-x64.tar.gz /usr/local/
RUN mv /usr/local/jdk1.8.0_101 /usr/local/jdk1.8
ENV JAVA_HOME /usr/local/jdk1.8
ENV PATH $JAVA_HOME/bin:$PATH

ADD hadoop-2.7.3.tar.gz /usr/local
RUN mv /usr/local/hadoop-2.7.3 /usr/local/hadoop
ENV HADOOP_HOME /usr/local/hadoop
ENV PATH $HADOOP_HOME/bin:$PATH

RUN yum install -y which sudo

$ docker build -t="hadoop" .

//容器hadoop0啟動時，映射了埠號，50070和8088，是用來在瀏覽器中訪問hadoop WEB介面的
$ docker run --name hadoop0 --hostname hadoop0 -d -P -p 50070:50070 -p 8088:8088 hadoop
$ docker run --name hadoop1 --hostname hadoop1 -d -P hadoop
$ docker run --name hadoop2 --hostname hadoop2 -d -P hadoop

//配置ip
$ pipework br1 hadoop0 192.168.3.30/24
$ pipework br1 hadoop1 192.168.3.31/24
$ pipework br1 hadoop2 192.168.3.32/24

//連線到container
$ docker exec -it hadoop0 /bin/bash
$ docker exec -it hadoop1 /bin/bash
$ docker exec -it hadoop2 /bin/bash

//在各個centos中修改/etc/hosts
192.168.3.30    master
192.168.3.31    slave1
192.168.3.32    slave2

引用參考：

https://mp.weixin.qq.com/s?__biz=MzA4Nzc4MjI4MQ==&mid=2652402238&idx=1&sn=44d2a68fb5097db61daacc061ce9d300&scene=21#wechat_redirect