搭建HDFS和HBase集群

1、软件版本

Oracle JDK七、Hadoop 2.7.三、HBase 1.2.三、Centos 7

2、注意点

1. 操做系统的hostname必须配置，不要直接用IP，不然zookeeper会报错

2. 关闭操做系统防火墙，或者配置port白名单

3. 必须同步时钟，不然HBase的Master进程会报错（https://my.oschina.net/nk2011/blog/784015）

3、集群共4台机器，hostname和ip对应以下

192.168.1.1  node1

192.168.1.2  node2

192.168.1.3  node3

192.168.1.4  node4

4、机器分配以下

Hadoop:

node1  namenode

node2  secondarynamenode

node3  datanode

node4  datanode

HBase:

node1  master  zookeeper

node2  backup  zookeeper regionServer

node3  zookeeper regionServer

5、开始搭建 Hadoop 的 HDFS

1. 关门防火墙

systemctl stop firewalld

2. 编辑 /etc/hostname，修改hostname

3. 编辑 /etc/hosts，添加IP与hostname的映射

4. 建立 hadoop 用户，并修改密码

useradd hadoop
passwd hadoop

5. 安装JDK7，解压 Hadoop 2.7.3 到 /opt 目录

6. 修改 Hadoop 和 HBase 目录的拥有者

chown -R hadoop:hadoop /opt/hadoop-2.7.3
chown -R hadoop:hadoop /opt/hbase-1.2.3

7. 建立HDFS的数据目录

mkdir /opt/hadoop-2.7.3/hdfs
# name node 数据目录
mkdir /opt/hadoop-2.7.3/hdfs/name
# data node 数据目录
mkdir /opt/hadoop-2.7.3/hdfs/data
# 修改拥有者
chmod -R hadoop:hadoop /opt/hadoop-2.7.3/hdfs

8. 设置SSH免密码登陆（https://my.oschina.net/nk2011/blog/778623）

# 切换到 hadoop 用户
su hadoop
# 建立SSH的RSA密钥对
ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa
# 复制公钥到全部服务器
ssh-copy-id hadoop@node1
ssh-copy-id hadoop@node2
ssh-copy-id hadoop@node3
ssh-copy-id hadoop@node4

9. 配置 Hadoop 集群

1）打开 ${HADOOP_HOME}/etc/hadoop/hadoop-env.sh，设置 JAVA_HOME

2）打开 ${HADOOP_HOME}/etc/hadoop/core-site.xml，添加如下配置

<configuration>
  <property>
    <name>fs.defaultFS</name>
    <value>hdfs://node1:8020</value>
  </property>
  <property>
    <name>io.file.buffer.size</name>
    <value>131072</value>
  </property>
</configuration>

3）打开 ${HADOOP_HOME}/etc/hadoop/hdfs-site.xml，添加如下配置

<configuration>
  <property>
    <name>dfs.replication</name>
    <value>3</value>
  </property>
  <property>
    <name>dfs.namenode.name.dir</name>
    <value>file:/opt/hadoop-2.7.3/hdfs/name</value>
  </property>
  <property>
    <name>dfs.datanode.data.dir</name>
    <value>file:/opt/hadoop-2.7.3/hdfs/data</value>
  </property>
  <property>
    <name>dfs.blocksize</name>
    <value>268435456</value>
  </property>
  <property>
    <name>dfs.namenode.handle.count</name>
    <value>100</value>
  </property>
  #secondary name node配置
  <property>
    <name>dfs.namenode.secondary.http-address</name>
    <value>node2:50090</value>
  </property>
  <property>
    <name>dfs.namenode.http-address</name>
    <value>node1:50070</value>
  </property>
</configuration>

4）清空 ${HADOOP_HOME}/etc/hadoop/slaves，并加入如下内容

node2
node3
node4

5) 格式化HDFS的 name node

${HADOOP_HOME}/bin/hdfs namenode -format hadoop_cluster

10. 在node1，node2，node3，node4 上重复 1-9 步骤

11. Hadoop 的 HDFS 配置完毕，在 node1 上启动 Hadoop

[hadoop@node1]$ hadoop-2.7.3/sbin/start-dfs.sh 
Starting namenodes on [node1]
node1: starting namenode, logging to /opt/hadoop-2.7.3/logs/hadoop-hadoop-namenode-node1.out
node3: starting datanode, logging to /opt/hadoop-2.7.3/logs/hadoop-hadoop-datanode-node3.out
node2: starting datanode, logging to /opt/hadoop-2.7.3/logs/hadoop-hadoop-datanode-node2.out
node4: starting datanode, logging to /opt/hadoop-2.7.3/logs/hadoop-hadoop-datanode-node4.out
Starting secondary namenodes [node2]
node2: starting secondarynamenode, logging to /opt/hadoop-2.7.3/logs/hadoop-hadoop-secondarynamenode-node2.out

6、搭建 HBase

1. 解压 HBase 1.2.3 到 /opt 目录

2. 打开 ${HBASE_HOME}/conf/hbase-env.sh，设置 JAVA_HOME

3. 打开 ${HBASE_HOME}/conf/hbase-env.sh，设置 HBASE_PID_DIR

4. 打开 ${HBASE_HOME}/conf/hbase-site.xml，添加如下内容

<configuration>
  <property>
    <name>hbase.cluster.distributed</name>
    <value>true</value>
  </property>
  <property>
    <name>hbase.rootdir</name>
    <value>hdfs://node1:8020/hbase</value>
  </property>
  <property>
    <name>hbase.zookeeper.quorum</name>
    <value>node1,node2,node3</value>
  </property>
  <property>
    <name>hbase.zookeeper.property.dataDir</name>
    <value>/opt/hbase-1.2.3/zookeeper</value>
  </property>
</configuration>

5. 清空 ${HBASE_HOME}/conf/regionservers 文件，添加如下内容

node2
node3

6. 建立 ${HBASE_HOME}/conf/backup-masters 文件，添加如下内容

node2

7. 在 node1，node2，node3 重复 1-6 步骤

8. HBase配置完毕，在 node1 上启动 HBase（确保Hadoop已经启动）

[hadoop@node3]$ /opt/hbase-1.2.3/bin/start-hbase.sh 
node1: starting zookeeper, logging to /opt/hbase-1.2.3/bin/../logs/hbase-hadoop-zookeeper-node1.out
node2: starting zookeeper, logging to /opt/hbase-1.2.3/bin/../logs/hbase-hadoop-zookeeper-node2.out
node3: starting zookeeper, logging to /opt/hbase-1.2.3/bin/../logs/hbase-hadoop-zookeeper-node3.out
starting master, logging to /opt/hbase-1.2.3/bin/../logs/hbase-hadoop-master-node1.out
node2: starting regionserver, logging to /opt/hbase-1.2.3/bin/../logs/hbase-hadoop-regionserver-node2.out
node3: starting regionserver, logging to /opt/hbase-1.2.3/bin/../logs/hbase-hadoop-regionserver-node3.out
node2: starting master, logging to /opt/hbase-1.2.3/bin/../logs/hbase-hadoop-master-node2.out