hadoop2.6.3安装

Ubuntu 14.04 LTS 64位版本上安装hadoop 2.6.3过程记录

• 安装JDK
• 安装并设置ssh免密码登录
• 安装hadoop2.6.3

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安装jdk并设置好JDK环境变量

jdk的具体安装和设置这里不赘述，网上一大堆参考文章。

安装并设置ssh免密码登录

ssh不是hadoop的依赖环境，但是如果你要登录管理成百上千台hadoop主机，ssh的免密码登录必不可少。 shell命令如下

sudo apt-get updatesudo apt-get install sshssh-keygen -t dsa -P '' -f ~/.ssh/id_rsacat .ssh/id_rsa.pub >> ~/.ssh/authorized_keys

执行 ssh localhost
如果显示如下信息，说明ssh免密码登录已经配置好了，第一次登录时会询问是否继续，输入yes即可。

The authenticity of host 'localhost (127.0.0.1)' can't be established.ECDSA key fingerprint is ec:67:f0:9f:51:ac:5b:2d:6a:d3:61:3c:2e:93:1d:81.Are you sure you want to continue connecting (yes/no)? yesWarning: Permanently added 'localhost' (ECDSA) to the list of known hosts.Welcome to Ubuntu 14.04.3 LTS (GNU/Linux 3.13.0-65-generic x86_64) * Documentation:  https://help.ubuntu.com/The programs included with the Ubuntu system are free software;the exact distribution terms for each program are described in theindividual files in /usr/share/doc/*/copyright.Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted byapplicable law.

安装hadoop-2.6.3

下载并解压hadoop-2.6.3.tar.gz

sudo mkdir -p /opt/hadoopcd /opt/hadoopwget http://www.apache.org/dyn/closer.cgi/hadoop/common/hadoop-2.6.3/hadoop-2.6.3.tar.gztar -zxvf hadoop-2.6.3.tar.gz

配置以下3个配置文件

etc/hadoop/core-site.xml

<configuration>    <property>        <name>fs.default.name</name>        <value>hdfs://localhost:9000</value>    </property></configuration>

etc/hadoop/hdfs-site.xml

<configuration>    <property>        <name>dfs.replication</name>        <value>1</value>    </property></configuration>

etc/hadoop/mapred-site.xml

<configuration>    <property>        <name>mapred.job.tracker</name>        <value>localhost:9001</value>    </property>    </configuration>

格式化hadoop的文件系统HDFS

./bin/hdfs namenode -format

启动hadoop所有进程

./sbin/start-dfs.sh./sbin/start-yarn.sh

提示 localhost: Error: JAVA_HOME is not set and could not be found.

修改etc/hadoop/hadoop-env.sh文件中下面这一行：

export JAVA_HOME=${JAVA_HOME}

修改为使用绝对路径值

export JAVA_HOME=/linuxdata/apps/jdk1.8.0_45 # 绝对路径

重新执行上述启动命令，即可启动，提示如下：

Starting namenodes on [localhost]localhost: starting namenode, logging to /linuxdata/apps/hadoop-2.6.3/logs/hadoop-root-namenode-kline-r400.outlocalhost: starting datanode, logging to /linuxdata/apps/hadoop-2.6.3/logs/hadoop-root-datanode-kline-r400.outStarting secondary namenodes [0.0.0.0]0.0.0.0: starting secondarynamenode, logging to /linuxdata/apps/hadoop-2.6.3/logs/hadoop-root-secondarynamenode-kline-r400.outstarting yarn daemonsstarting resourcemanager, logging to /linuxdata/apps/hadoop-2.6.3/logs/yarn-root-resourcemanager-kline-r400.outlocalhost: starting nodemanager, logging to /linuxdata/apps/hadoop-2.6.3/logs/yarn-root-nodemanager-kline-r400.out

到此，你的hadoop就已经安装并成功启动。

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