hadoop start-dfs.sh Error: JAVA_HOME is not set and could not be found

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# sbin/start-dfs.sh 报错如下

[hadoop@vm7 hadoop-2.7.1]$ sbin/start-dfs.shStarting namenodes on [localhost]localhost: Error: JAVA_HOME is not set and could not be found.localhost: Error: JAVA_HOME is not set and could not be found.

解决：

# vim /home/hadoop/.bashrc 添加如下内容

export JAVA_HOME=/usr/local/jdk1.7.0_65export PATH=$PATH:$JAVA_HOME/binexport HADOOP_PREFIX=/home/hadoop/hadoop-2.7.1

再次启动

# sbin/start-dfs.sh

[hadoop@vm7 hadoop-2.7.1]$ sbin/start-dfs.sh Starting namenodes on [localhost]localhost: starting namenode, logging to /home/hadoop/hadoop-2.7.1/logs/hadoop-hadoop-namenode-vm7.0.outlocalhost: starting datanode, logging to /home/hadoop/hadoop-2.7.1/logs/hadoop-hadoop-datanode-vm7.0.outStarting secondary namenodes [0.0.0.0]0.0.0.0: starting secondarynamenode, logging to /home/hadoop/hadoop-2.7.1/logs/hadoop-hadoop-secondarynamenode-vm7.0.out

ok!

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