hadoop单机安装

操作系统:centos7.4
cdh的hadoop发行版:hadoop-2.6-chd5.15.1

ssh免密登录配置

• ssh安装(已安装跳过):yum install -y openssh-server openssh-clients
• 生成密钥:ssh-keygen -t rsa
• 拷贝密钥:ssh-copy-id -i ~/.ssh/id_rsa.pub [ip/hosts]

注意事项:

1. .ssh目录的权限必须是700
2. .ssh/authorized_keys文件权限必须是600

hadoop环境变量配置

• hadoop-env.sh配置:${HADOOP_HOME}/etc/hadoop/hadoop-env.sh

export JAVA_HOME=/bigdata/jdk/jdk1.8.0_231
export HADOOP_HOME=/bigdata/hadoop/hadoop-2.6.0-cdh5.15.1
export HADOOP_CONF_DIR=/bigdata/hadoop/hadoop-2.6.0-cdh5.15.1/etc/hadoop

HDFS启动

• core-site.xml配置:${HADOOP_HOME}/etc/hadoop/core-site.xml

<configuration>
    <property>
        <name>fs.defaultFS</name>
        <value>hdfs://主机名:9000</value>
    </property>
</configuration>

• hdfs-site.xml配置:${HADOOOP_HOME}/etc/hadoop/hdfs-site.xml

<configuration>
    <property>
        <name>dfs.replication</name>
        <value>1</value>
    </property>
</configuration>

• slave文件配置:${HADOOP_HOME}/etc/hadoop/slaves

#根据自己的主机名填写
${主机名}

• HDFS文件系统格式化:${HADOOP_HOME}/bin/hdfs namenode -format

• 启动HDFS:${HADOOP_HOME}/sbin/start-dfs.sh

YARN启动

• mapred-site.xml配置:${HADOOP_HOME}/etc/hadoop/mapred-site.xml

<configuration>
    <property>
        <name>mapreduce.framework.name</name>
        <value>yarn</value>
    </property>
</configuration>

• yarn-site.xml配置：${HADOOP_HOME}/etc/hadoop/yarn-site.xml

<configuration>
    <property>
        <name>yarn.nodemanager.aux-services</name>
        <value>mapreduce_shuffle</value>
    </property>
</configuration>

• 启动yarn：${HADOOP_HOME}/sbin/start-yarn.sh

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