构建Spark分布式集群第一步：搭建Hadoop伪分布式环境

一：Java环境的配置：

1安装Java：打开终端，新建目录：mkdir /usr/lib/java

2把下载好的jdk文件移到刚刚创建的目录中 mv /root/Downloads/jdk-8u131-linux-x64.tar.gz /usr/lib/java

3解压jdk文件：cd /usr/lib/java

                           tar -xvf jdk-8u131-linux-x64.tar.gz

4修改环境变量： vim ~/.bashrc在最后加上：

                                                     export JAVA_HOME=/usr/lib/java/jdk1.8.0_111
                                                     export JRE_HOME=${JAVA_HOME}/jre
                                                     export CLASS_PATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
                                                     export PATH=${JAVA_HOME}/bin:$PATH

使之生效：source ~/.bashrc

5在终端显示java版本: java -version

坑：下载Java jdk时，自己的电脑是64位的，否则会报找不到路径的错误，x86是32位，x64是64位

二：安装ssh:

只需一条命令：sudo apt-get install ssh

坑：会报这种错：               

                      E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
                      E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?

解决方案：sudo rm /var/cache/apt/archives/lock
                    sudo rm /var/lib/dpkg/lock

报错的原因是资源的互锁，需要先删掉