centos7下的jdk与hadoop的安装

首先在/opt目录下创建module与software文件夹

module用于存放解压后的文件 software用于存放文件的压缩包

mkdir module
mkdir software

查看文件权限

[dev1@hadoop100 opt]$ sudo mkdir module
[dev1@hadoop100 opt]$ sudo mkdir software
[dev1@hadoop100 opt]$ ll
总用量 0
drwxr-xr-x. 2 root root 6 7月   9 16:52 module
drwxr-xr-x. 2 root root 6 9月   7 2017 rh
drwxr-xr-x. 2 root root 6 7月   9 16:52 software

将文件夹拥有者修改为dev1

[dev1@hadoop100 opt]$ sudo chown -R dev1:dev1 /opt/module/ /opt/software/
[dev1@hadoop100 opt]$ ll
总用量 0
drwxr-xr-x. 2 dev1 dev1 6 7月   9 16:52 module
drwxr-xr-x. 2 root root 6 9月   7 2017 rh
drwxr-xr-x. 2 dev1 dev1 6 7月   9 16:52 software

删除自带的jdk

查询系统自带的jdk

rpm -qa | grep jdk

[dev1@hadoop100 opt]$ rpm -qa | grep jdk
copy-jdk-configs-3.3-2.el7.noarch
java-1.8.0-openjdk-headless-1.8.0.161-2.b14.el7.x86_64
java-1.7.0-openjdk-1.7.0.171-2.6.13.2.el7.x86_64
java-1.8.0-openjdk-1.8.0.161-2.b14.el7.x86_64
java-1.7.0-openjdk-headless-1.7.0.171-2.6.13.2.el7.x86_64

对原有的jdk进行删除

[dev1@hadoop100 opt]$ sudo rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.161-2.b14.el7.x86_64
[dev1@hadoop100 opt]$ sudo rpm -e --nodeps java-1.7.0-openjdk-headless-1.7.0.171-2.6.13.2.el7.x86_64
[dev1@hadoop100 opt]$ sudo rpm -e --nodeps java-1.8.0-openjdk-1.8.0.161-2.b14.el7.x86_64
[dev1@hadoop100 opt]$ sudo rpm -e --nodeps java-1.7.0-openjdk-1.7.0.171-2.6.13.2.el7.x86_64

将上传到software文件夹的jdk压缩包进行解压

[dev1@hadoop100 opt]$ tar -zxvf /opt/software/jdk-8u212-linux-x64.tar.gz -C /opt/module/

配置环境变量

vim /etc/profile

内容如下

#JAVA_HOME
export JAVA_HOME=/opt/module/jdk1.8.0_212
export PATH=$PATH:$JAVA_HOME/bin

重新加载/etc/profile文件

source /etc/profile

[dev1@hadoop100 opt]$ source /etc/profile
[dev1@hadoop100 opt]$ java -version
java version "1.8.0_212"
Java(TM) SE Runtime Environment (build 1.8.0_212-b10)
Java HotSpot(TM) 64-Bit Server VM (build 25.212-b10, mixed mode)

安装hadoop同理

解压hadoop

[dev1@hadoop100 opt]$ tar -zxvf /opt/software/hadoop-3.1.3.tar.gz -C /opt/module/

配置/etc/profile

[dev1@hadoop100 opt]$ sudo vim /etc/profile

#HADOOP_HOME
export HADOOP_HOME=/opt/module/hadoop-3.1.3
export PATH=$PATH:$HADOOP_HOME/bin
export PATH=$PATH:$HADOOP_HOME/sbin

重新加载并检查

[dev1@hadoop100 opt]$ source /etc/profile
[dev1@hadoop100 opt]$ hadoop version
Hadoop 3.1.3
Source code repository https://gitbox.apache.org/repos/asf/hadoop.git -r ba631c436b806728f8ec2f54ab1e289526c90579
Compiled by ztang on 2019-09-12T02:47Z
Compiled with protoc 2.5.0