如何配置一个环境变量HADOOP

典型的配置：

export HADOOP_HOME=/usr/local/hadoop

export HADOOP_MAPRED_HOME=$HADOOP_HOME

export HADOOP_COMMON_HOME=$HADOOP_HOME

export HADOOP_HDFS_HOME=$HADOOP_HOME

export HADOOP_CONF_DIR=$HADOOP_HOME/etc/hadoop

export YARN_HOME=$HADOOP_HOMEexport 

YARN_CONF_DIR=$HADOOP_HOME/etc/hadoop

export PATH=$PATH:$JAVA_HOME/bin:$HADOOP_HOME/bin:$HADOOP_HOME/sbin
export

LD_LIBRARY_PATH=$JAVA_HOME/jre/lib/amd64/server:/usr/local/lib:$HADOOP_HOM

/lib/native

修改hadoop解压文件名称 ：

mv hadoop-2.4.1 hadoop

将hadoop安装目录的权限赋值为hadoop用户：

chown -R hadoop:hadoop hadoop

创建Hadoop数据目录，并赋予权限：

[root@djt java]# mkdir -p /data/dfs/name

[root@djt java]# mkdir -p /data/dfs/data

[root@djt java]# mkdir -p /data/tmp

[root@djt java]# chown -R hadoop:hadoop hadoop /data/

[root@djt java]# ls -l /d

data/ dev/  [root@djt java]# ls -l /data/

total 8

drwxr-xr-x 4 hadoop hadoop 4096 May 21 17:26 dfs

drwxr-xr-x 2 hadoop hadoop 4096 May 21 17:26 tmp

1.1修改主机名

vim /etc/sysconfig/network

NETWORKING=yes

HOSTNAME=itcast    ###

典型的配置：

export HADOOP_HOME=/usr/local/hadoop
export HADOOP_MAPRED_HOME=$HADOOP_HOME
export HADOOP_COMMON_HOME=$HADOOP_HOME
export HADOOP_HDFS_HOME=$HADOOP_HOME
export HADOOP_CONF_DIR=$HADOOP_HOME/etc/hadoop
export YARN_HOME=$HADOOP_HOME
export YARN_CONF_DIR=$HADOOP_HOME/etc/hadoop
export PATH=$PATH:$JAVA_HOME/bin:$HADOOP_HOME/bin:$HADOOP_HOME/sbin
export LD_LIBRARY_PATH=$JAVA_HOME/jre/lib/amd64/server:/usr/local/lib:$HADOOP_HOME/lib/native
export JAVA_LIBRARY_PATH=$LD_LIBRARY_PATH:$JAVA_LIBRARY_PATH