CentOS7.4下Hadoop3.0单机安装教程

相关下载
hive下载地址
http://mirrors.hust.edu.cn/apache/hive/stable-2/apache-hive-2.3.2-bin.tar.gz
hadoop下载地址
https://mirrors.tuna.tsinghua.edu.cn/apache/hadoop/common/hadoop-3.0.0/hadoop-3.0.0.tar.gz

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1. hive安装目录 /opt/hive/apache-hive-2.3.2-bin
2. hadoop安装目录 /opt/hadoop/hadoop-3.0.0
3. JDK安装目录 /usr/java/jdk1.8.0_65
4. 环境变量配置
export JAVA_HOME=/usr/java/jdk1.8.0_65
export HADOOP_HOME=/opt/hadoop/hadoop-3.0.0
export HADOOP_CONF_DIR=${HADOOP_HOME}/etc/hadoop
export HADOOP_COMMON_LIB_NATIVE_DIR=${HADOOP_HOME}/lib/native
export HADOOP_OPTS="-Djava.library.path=${HADOOP_HOME}/lib"
export HIVE_HOME=/opt/hive/apache-hive-2.3.2-bin
export HIVE_CONF_DIR=${HIVE_HOME}/conf
export CLASS_PATH=.:${JAVA_HOME}/lib:${HIVE_HOME}/lib:$CLASS_PATH
export PATH=.:${JAVA_HOME}/bin:${HADOOP_HOME}/bin:${HADOOP_HOME}/sbin:${HIVE_HOME}/bin:$PATH
5. 让环境变量生效
source /etc/profile
6. vim /opt/hadoop/hadoop-3.0.0/etc/hadoop/core-site.xml 修改

fs.defaultFS
hdfs://localhost:9000

hadoop.tmp.dir
/opt/hadoop/tmp

7. vim /opt/hadoop/hadoop-3.0.0/etc/hadoop/hdfs-site.xml 修改增加以下内容

dfs.name.dir
/opt/hadoop/hdfs/name
namenode上存储hdfs名字空间元数据

dfs.data.dir
/opt/hadoop/hdfs/data
datanode上数据块的物理存储位置

dfs.replication
1

8. SSH 设置免密码登录
ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa
cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys
chmod 0600 ~/.ssh/authorized_keys
9. 启动命令
9.1 初始化
cd /opt/hadoop/hadoop-3.0.0
./bin/hdfs namenode -format
9.2 启动命令
./sbin/start-dfs.sh
9.3 停止命令
./sbin/stop-dfs.sh

错误处理
Starting namenodes on [localhost]
ERROR: Attempting to operate on hdfs namenode as root
ERROR: but there is no HDFS_NAMENODE_USER defined. Aborting operation.
Starting datanodes
ERROR: Attempting to operate on hdfs datanode as root
ERROR: but there is no HDFS_DATANODE_USER defined. Aborting operation.
Starting secondary namenodes [bogon]
ERROR: Attempting to operate on hdfs secondarynamenode as root
ERROR: but there is no HDFS_SECONDARYNAMENODE_USER defined. Aborting operation.
处理1
$ vim sbin/start-dfs.sh
$ vim sbin/stop-dfs.sh
两处增加以下内容
HDFS_DATANODE_USER=root
HADOOP_SECURE_DN_USER=hdfs
HDFS_NAMENODE_USER=root
HDFS_SECONDARYNAMENODE_USER=root
处理2
$ vim sbin/start-yarn.sh
$ vim sbin/stop-yarn.sh
两处增加以下内容
YARN_RESOURCEMANAGER_USER=root
HADOOP_SECURE_DN_USER=yarn
YARN_NODEMANAGER_USER=root

10. 验证安装
http://192.168.50.48:9870/dfshealth.html#tab-overview

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