hadoop集群搭建之HA模式

1.Hadoop环境变量相关配置

1.在node01上创建hadoop安装路径：

mkdir /opt/bigdata

2.解压hadoop软件包

tar xf hadoop-2.6.5.tar.gz

mv hadoop-2.6.5 /opt/bigdata/

3.配置hadoop环境便令

vi /etc/profile

export JAVA_HOME=/usr/java/default

export HADOOP_HOME=/opt/bigdata/hadoop-2.6.5

export PATH= $PATH:$ JAVA_HOME/bin: $HADOOP_HOME/bin:$ HADOOP_HOME/sbin

4.使配置生效

source /etc/profile

5.检测

在任意目录输入hd按Tab建看是否能联想出hdfs命令，有侧安装配置成功

6.从node01分发到其他节点（node02，node03，node04）

cd /opt

scp -r ./bigdata/ node02:`pwd`

scp -r ./bigdata/ node03:`pwd`

scp -r ./bigdata/ node04:`pwd`

2.安装zookeeper（node02，node03，node04）

node02:

tar xf zook....tar.gz

mv zoo... /opt/bigdata

cd /opt/bigdata/zoo....

cd conf

cp zoo_sample.cfg zoo.cfg

vi zoo.cfg

datadir=/var/bigdata/hadoop/zk

server.1=node02:2888:3888

server.2=node03:2888:3888

server.3=node04:2888:3888

mkdir /var/bigdata/hadoop/zk

echo 1 > /var/bigdata/hadoop/zk/myid

vi /etc/profile

export ZOOKEEPER_HOME=/opt/bigdata/zookeeper-3.4.6

export PATH= $PATH:$ JAVA_HOME/bin: $HADOOP_HOME/bin:$ HADOOP_HOME/sbin:$ZOOKEEPER_HOME/bin

. /etc/profile

cd /opt/bigdata

scp -r ./zookeeper-3.4.6 node03:`pwd`

scp -r ./zookeeper-3.4.6 node04:`pwd`

node03:

mkdir /var/bigdata/hadoop/zk

echo 2 > /var/bigdata/hadoop/zk/myid

*环境变量

. /etc/profile

node04:

mkdir /var/bigdata/hadoop/zk

echo 3 > /var/bigdata/hadoop/zk/myid

*环境变量

. /etc/profile

node02~node04:

zkServer.sh start

3.hadoop文件相关配置

1.修改hadoop-env.sh

vi hadoop-env.sh

export JAVA_HOME=/usr/java/default

2.修改core-site.xml

vi core-site.xml

XML 复制代码

<property>
    <name>fs.defaultFS</name>
	<value>hdfs://mycluster</value>
</property>

<property>
	<name>ha.zookeeper.quorum</name>
	<value>node02:2181,node03:2181,node04:2181</value>
</property>

3.修改hdfs-site.xml

vi hdfs-site.xml

XML 复制代码

<property>
		  <name>dfs.nameservices</name>
		  <value>mycluster</value>
		</property>
		<property>
		  <name>dfs.ha.namenodes.mycluster</name>
		  <value>nn1,nn2</value>
		</property>
		<property>
		  <name>dfs.namenode.rpc-address.mycluster.nn1</name>
		  <value>node01:8020</value>
		</property>
		<property>
		  <name>dfs.namenode.rpc-address.mycluster.nn2</name>
		  <value>node02:8020</value>
		</property>
		<property>
		  <name>dfs.namenode.http-address.mycluster.nn1</name>
		  <value>node01:50070</value>
		</property>
		<property>
		  <name>dfs.namenode.http-address.mycluster.nn2</name>
		  <value>node02:50070</value>
		</property>

		#以下是JN在哪里启动，数据存那个磁盘
		<property>
		  <name>dfs.namenode.shared.edits.dir</name>
		  <value>qjournal://node01:8485;node02:8485;node03:8485/mycluster</value>
		</property>
		<property>
		  <name>dfs.journalnode.edits.dir</name>
		  <value>/var/bigdata/hadoop/ha/dfs/jn</value>
		</property>
		
		#HA角色切换的代理类和实现方法，我们用的ssh免密
		<property>
		  <name>dfs.client.failover.proxy.provider.mycluster</name>
		  <value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value>
		</property>
		<property>
		  <name>dfs.ha.fencing.methods</name>
		  <value>sshfence</value>
		</property>
		<property>
		  <name>dfs.ha.fencing.ssh.private-key-files</name>
		  <value>/root/.ssh/id_dsa</value>
		</property>
		
		#开启自动化： 启动zkfc
		 <property>
		   <name>dfs.ha.automatic-failover.enabled</name>
		   <value>true</value>
		 </property>

4.修改vi slaves

vi slaves

XML 复制代码

node02
node03
node04