docker常用命令：

執行映象：
<code>docker run -i -t centos  /bin/bash</code>

提交映象：
<code>docker commit 3a09b2588478 ubuntu:mynewimage</code>

掛載目錄：
docker run --privileged=true  -v /home/admin/Downloads:/mnt -i -t centos

複製檔案：
cp hostpath dockerpath

下載：

hadoop-2.7.2.tar.gz

jdk-7u67-linux-x64.tar.gz

解壓檔案：

<pre><code>tar xvzf hadoop-2.7.2.tar.gz
</code>

<span style="color:#3366ff;"><span style="color:#000000;"><strong>設定環境變數：</strong>
vi /etc/profile</span></span><code></code>檔案。在檔案末尾加入下面配置資訊：

export JAVA_HOME=/root/soft/jdk1.7.0_67
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin
export HADOOP_HOME=/root/soft/hadoop-2.7.2
export HADOOP_CONFIG_HOME=$HADOOP_HOME/etc/hadoop
export PATH=$PATH:$HADOOP_HOME/bin
export PATH=$PATH:$HADOOP_HOME/sbin

使之立即生效
source /etc/profile

<strong>配置hadoop:</strong>
<pre><code>cd $HADOOP_CONFIG_HOME</code>
 

cp mapred-site.xml.template mapred-site.xml

[[email protected] hadoop]# cat core-site.xml                                                                                                    
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!--
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License. See accompanying LICENSE file.
-->

<!-- Put site-specific property overrides in this file. -->

<configuration>
    <property>
            <name>hadoop.tmp.dir</name>
            <value>/root/soft/hadoop-2.7.2/tmp</value>
            <description>A base for other temporary directories.</description>
    </property>

    <property>
            <name>fs.default.name</name>
            <value>hdfs://master:9000</value>
            <final>true</final>
            <description>The name of the default file system.  A URI whose
            scheme and authority determine the FileSystem implementation.  The
            uri's scheme determines the config property (fs.SCHEME.impl) naming
            the FileSystem implementation class.  The uri's authority is used to
            determine the host, port, etc. for a filesystem.</description>
    </property>
</configuration>


[

[email protected] hadoop]# vi hdfs-site.xml
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!--
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License. See accompanying LICENSE file.
-->

<!-- Put site-specific property overrides in this file. -->

<configuration>
   <property>
        <name>dfs.replication</name>
        <value>2</value>
        <final>true</final>
        <description>Default block replication.
        The actual number of replications can be specified when the file is created.
        The default is used if replication is not specified in create time.
        </description>
    </property>

    <property>
        <name>dfs.namenode.name.dir</name>
        <value>/root/soft/hadoop-2.7.2/namenode</value>
        <final>true</final>
    </property>

    <property>
        <name>dfs.datanode.data.dir</name>
        <value>/root/soft/hadoop-2.7.2/datanode</value>
        <final>true</final>
    </property>

</configuration>


[[email protected] hadoop]# vi mapred-site.xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!--
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License. See accompanying LICENSE file.
-->

<!-- Put site-specific property overrides in this file. -->

<configuration>
   <property>
        <name>mapred.job.tracker</name>
        <value>master:9001</value>
        <description>The host and port that the MapReduce job tracker runs
        at.  If "local", then jobs are run in-process as a single map
        and reduce task.
        </description>
    </property>
</configuration>

格式化 namenode，進入 hadoop/bin目錄下執行

hdfs namenode -format

安裝ssh
yum install openssh-server
yum -y install openssh-clients

生成訪問金鑰

[email protected]:/# cd ~/
[email protected]:~# ssh-keygen -t rsa -P '' -f ~/.ssh/id_dsa
[email protected]:~# cd .ssh
[email protected]:~/.ssh# cat id_dsa.pub >> authorized_keys

儲存映象副本

這裡我們將安裝好Hadoop的映象儲存為一個副本。

[email protected]:~# exit
[email protected]:~$ docker commit -m "hadoop-2.7.2 install" 8ef06706f88d centos:hadoop

檢視docker ip
docker inspect --format '{{.NetworkSettings.IPAddress}}' 33d36f3b5c4c

<pre><code></code><pre name="code" class="plain"><pre><code>docker run -d -ti --name master -h master centos:hadoop</code>

<pre><code>docker run -d -ti --name slave1 -h slave1 centos:hadoop</code>

<pre><code></code><pre name="code" class="plain"><pre><code>docker run -d -ti --name slave2 -h slave2 centos:hadoop</code>