[Hadoop][01]JDK

#!/bin/bash

# JAVA JDK 安装文件
JDK_INSTALL_FILE=/tmp/jdk-8u131-linux-x64.rpm
# JAVA JDK 目录
JDK_INSTALL_DIR=/usr/java/jdk1.8.0_131

# 安装JAVA JDK
if [ -f $JDK_INSTALL_FILE ]; then
rpm -ivh /tmp/jdk-8u131-linux-x64.rpm
# 指定JAVA JDK 安装目录
#rpm -ivh --prefix=/opt jdk-8u131-linux-x64.rpm
else
echo 'require Java JDK install file'
return
fi

# 配置JAVA JDK 环境变量
if [ -z $JAVA_HOME ]; then
echo 'JAVA_HOME=/usr/java/default' >> /etc/profile
echo 'JRE_HOME=$JAVA_HOME/jre' >> /etc/profile
echo 'PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin' >> /etc/profile
echo 'CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib' >> /etc/profile
echo 'export JAVA_HOME JRE_HOME PATH CLASSPATH' >> /etc/profile
source /etc/profile
else
echo "JAVA_HOME = $JAVA_HOME"
fi

#DNS解析
sed -i 's/#networkaddress.cache.ttl=-1/networkaddress.cache.ttl=60/' $JRE_HOME/lib/security/java.security

# 查看JAVA版本
#java -version