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yum install java-1.8.0-openjdk java-1.8.0-openjdk-devel 安装openjdk
wget http://apache.mirrors.pair.com/hadoop/common/hadoop-2.7.6/hadoop-2.7.6.tar.gz
tar -xzf hadoop-2.7.6.tar.gz
vi .bashrc 设置环境变量
export JAVA_HOME=/usr/lib/jvm/java
export PATH=$JAVA_HOME/bin:${PATH}
export PATH=/root/hadoop-2.7.6/bin:${PATH}
检查java与hadoop
echo $JAVA_HOME
which java
which hadoop
测试hadoop
mkdir hadoop
cd hadoop
cp /root/hadoop-2.7.6/etc/hadoop/*.xml .
hadoop jar ~/hadoop-2.7.6/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.6.jar grep . ./output 'principal[.]*'
cat cat output/*
6 principal
1 principal.