.1 依赖安装、免密登录

依赖安装

sudo apt install ssh
sudo apt install pdsh

免密登录

# 创建ssh密匙，执行如下命令后回车到底
ssh-keygen -t rsa
# 将产生的公共密匙追加到authorized_keys
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
# 尝试免密码登录（初次登录会询问然后需要输入yes，二次登录可以直接登录）配置成功
ssh localhost

.2 安装Java

• Java文件

# 创建jdk文件夹
sudo mkdir -p /opt/java

# 进入Downloads文件夹
cd ~/Downloads

# 通过wget下载
wget --no-check-certificate --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u172-b11/a58eab1ec242421181065cdc37240b08/jdk-8u172-linux-x64.tar.gz

# 解压
tar -zxf jdk-8u172-linux-x64.tar.gz

# 将jdk文件夹移动到/opt/java/
sudo mv jdk1.8.0_172/ /opt/java/jdk1.8.0_172/

• 在服务器database（192.168.56.110）上安装Cassandra
• 配置Java变量文件源码

1.通过vim创建jdk-1.8.sh文件

sudo vim /etc/profile.d/jdk-1.8.sh

2.添加如下内容

#!/bin/sh
# Author:wangxiaolei 王小雷
# Blog: http://blog.csdn.net/dream_an
# Github: https://github.com/lycheeman
# project: https://github.com/lycheeman/big-data
# Date: 2018.07

export JAVA_HOME=/opt/java/jdk1.8.0_172
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

3.让Java变量生效

source /etc/profile

4.查看已配置完成的Java

java -version

.3 伪分布式——Hadoop MapReduce配置

1. etc/hadoop/hadoop-env.sh

export JAVA_HOME=/opt/java/jdk1.8.0_172

2. etc/hadoop/core-site.xml

<configuration>
    <property>
        <name>fs.defaultFS</name>
        <value>hdfs://localhost:9000</value>
    </property>
    <property>
      <name>hadoop.proxyuser.busuanzi.hosts</name>
      <value>*</value>
    </property>
    <property>
      <name>hadoop.proxyuser.busuanzi.groups</name>
      <value>*</value>
    </property>
</configuration>

3. etc/hadoop/hdfs-site.xml

<configuration>

    <property>
      <name>dfs.namenode.name.dir</name>
      <value>/var/lib/hadoop/hdfs/name/</value>
    </property>
    <property>
      <name>dfs.datanode.data.dir</name>
      <value>/var/lib/hadoop/hdfs/data/</value>
    </property>
    <property>
        <name>dfs.replication</name>
        <value>1</value>
    </property>

</configuration>

.4 配置Hadoop环境变量

sudo vim /etc/profile.d/hadoop-3.1.0.sh

增加如下内容

#!/bin/sh
# Author:wangxiaolei 王小雷
# Github: https://github.com/lycheeman

export HADOOP_HOME="/opt/hadoop/hadoop-3.1.0"
export PATH="$HADOOP_HOME/bin:$PATH"
export HADOOP_CONF_DIR=$HADOOP_HOME/etc/hadoop
export YARN_CONF_DIR=$HADOOP_HOME/etc/hadoop

使变量生效

source /etc/profile

.5 伪分布式——Hadoop MapReduce开启

1. 创建HDFS系统文件，并且改权限为hadoop用户，设置rcmd_default入口。

sudo mkdir /var/lib/hadoop
sudo chown busuanzi:busuanzi /var/lib/hadoop/

# 新建rcmd_default文件
# 设置rcmd_default入口，避免出现 master: rcmd: socket: Permission denied
sudo sh -c "echo "ssh" > /etc/pdsh/rcmd_default"

２. 格式化(注意格式化只需要执行一次即可)

cd /opt/hadoop/hadoop-3.1.0/
bin/hdfs namenode -format

3. 开启NameNode和DataNode

sbin/start-dfs.sh

4. jps查看启动成功

jps

5. 浏览器访问namenode http://192.168.56.101:9870/

注意，自Hadoop3.0之后，端口5007变成端口9870官方解释

.6 伪分布式——Hadoop YARN配置、开启 源码

1. etc/hadoop/mapred-site.xml:

<configuration>
    <property>
        <name>mapreduce.framework.name</name>
        <value>yarn</value>
    </property>
    <property>
        <name>mapreduce.application.classpath</name>
        <value>$HADOOP_MAPRED_HOME/share/hadoop/mapreduce/*:$HADOOP_MAPRED_HOME/share/hadoop/mapreduce/lib/*</value>
    </property>
</configuration>

2. etc/hadoop/yarn-site.xml:

<configuration>
    <property>
        <name>yarn.nodemanager.aux-services</name>
        <value>mapreduce_shuffle</value>
    </property>
    <property>
        <name>yarn.nodemanager.env-whitelist</name>
        <value>JAVA_HOME,HADOOP_COMMON_HOME,HADOOP_HDFS_HOME,HADOOP_CONF_DIR,CLASSPATH_PREPEND_DISTCACHE,HADOOP_YARN_HOME,HADOOP_MAPRED_HOME</value>
    </property>
</configuration>

.7 伪分布式——YARN开启

1. 启动YARN

sbin/start-yarn.sh

2. 使用jps查看启动情况

jps

3. 浏览器访问ResourceManager http://192.168.56.101:8088/

至此，伪分布式部署完成。

.8 开启历史查看服务

bin/mapred --daemon start historyserver

访问 http://192.168.56.101:19888/

.9 Hadoop 停止伪分布式集群命令

1. 停止YARN

sbin/stop-yarn.sh

2. 停止Namenode和Datanode

sbin/stop-dfs.sh

3. 停止历史服务

bin/mapred --daemon stop historyserver

开源、源码获取 https://github.com/lycheeman/big-data