hadoop installation and maintenance 01--JDK environment deployment

1. JDK environment deployment (perform operations on all servers)

  Download jdk:

jdk-7u79-linux-x64.rpm

  Install jdk:

rpm -ivh jdk-7u79-linux-x64.rpm

  Configure java environment variables, edit /etc/profile:

#使用 rpm -ql 文件名 查询安装的路径vi /etc/profile 
#添加以下配置：export JAVA_HOME=/usr/java/jkd1.7.9_79export JAVA_BIN=$JAVA_HOME/binexport PATH=$PATH:$JAVA_BINexport 
CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

Execute the following:, make the java environment variables take effect immediately

source /etc/profile

Query the jdk version:

[root@rhel1 ~]# java -versionjava version "1.7.0_45"OpenJDK Runtime Environment (rhel-2.4.3.3.el6-x86_64 u45-b15)
OpenJDK 64-Bit Server VM (build 24.45-b08, mixed mode)

1. JDK environment deployment (perform operations on all servers)

  Download jdk:

jdk-7u79-linux-x64.rpm

  Install jdk:

rpm -ivh jdk-7u79-linux-x64.rpm

  Configure java environment variables, edit /etc /profile:

#使用 rpm -ql 文件名 查询安装的路径vi /etc/profile 
#添加以下配置：export JAVA_HOME=/usr/java/jkd1.7.9_79export JAVA_BIN=$JAVA_HOME/binexport PATH=$PATH:$JAVA_BINexport 
CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

Execute the following: to make the java environment variable take effect immediately

source /etc/profile

Query the jdk version:

[root@rhel1 ~]# java -versionjava version "1.7.0_45"OpenJDK Runtime Environment (rhel-2.4.3.3.el6-x86_64 u45-b15)
OpenJDK 64-Bit Server VM (build 24.45-b08, mixed mode)

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