redhat JDK-1.8安装

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[hadoop@ipythonsource]$tar zxf jdk-8u25-linux-x64.tar.gz

#建立软连接后续更新方便#

[hadoop@ipython~]$ln -s/tools/source/jdk1.8.0_25/tools/java

#环境变量，略重要[确保权限哦]#

[hadoop@ipythonsource]$cat >/etc/profile.d/java_env<<EOF

exportJAVA_HOME=/tools/java

export JRE_HOME=/tools/java/jre

exportCLASSPATH=.:\$JAVA_HOME/lib:\$JRE_HOME/lib:\$CLASSPATH

export PATH=.:\$JAVA_HOME/bin:\$JRE_HOME/bin:\$PATH

EOF

#加权#

[hadoop@ipythonsource]$chown hadoop:hadoop/etc/profile.d/java_env.sh

[hadoop@ipythonsource]$chmod +x/etc/profile.d/java_env.sh

#重读环境变量#

[hadoop@ipythonsource]$su -hadoop

[hadoop@ipython~]$java -version

java version"1.8.0_25"

Java(TM)SE Runtime Environment(build1.8.0_25-b17)

Java HotSpot(TM)64-BitServer VM(build25.25-b02,mixed mode)

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