Centos7部署zookeeper-Hadoop-ha(三个节点)

linux准备

Vmware pro准备三台centos7的虚拟机，连接软件选择MobaXterm

分别进行以下操作：

​ 1、yum update 一路y

​ 2、yum install net-tools.x86_64 安装ifconfig。

​ 3、yum install -y java-1.8.0-openjdk.x86_64 安装jdk 1.8。安装完jdk目录在 /usr/lib/jvm/下

​ 4、windows下载zookeeper和hadoop的tar.gz。我用的是zookeeper-3.4.14和hadoop-2.7.7。

​ 5、mkdir /zookeeper tar -zxvf zookeeper-3.4.14.tar.gz -C /zookeeper/

​ 6、mkdir /Hadoop tar -zxvf hadoop-2.7.7.tar.gz -C /Hadoop/

​ 7、vim /etc/profile 在最下面加入之后 source /etc/profile

			export HADOOP_HOME=/Hadoop/hadoop-2.7.7
			export PATH=$PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin
			export ZOOKEEPER_HOME=/zookeeper/zookeeper-3.4.14
			export PATH=$PATH:$ZOOKEEPER_HOME/bin

​ 8、vim hosts（三台机子的ip）

192.168.101.132 master
192.168.101.133 slaver1
192.168.101.134 slaver2


#127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
#::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

​ 9、vim hostname 分别为 master|slaver1|slaver2

​ 10、yum install java-1.8.0-openjdk-devel.x86_64 下载之后不会提示jps找不到

免密登录设置

进入master机器

#一直点确定
ssh-keygen -t rsa

#以下三步都是输入密码即可
ssh-copy-id master

ssh-copy-id slaver1

ssh-copy-id slaver2

#验证是否免密,以下三步如果不输入密码就进去了，则成功。
ssh master 

ssh slaver1

ssh slaver2

#退出
exit

zookeeper文件修改

​ 1、进入conf文件夹下

	mv zoo_sample.cfg zoo.cfg 
	vim zoo.cfg
   
# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just
# example sakes.
dataDir=/zookeeper/zookeeper-3.4.14/data
# the port at which the clients will connect
clientPort=2181
# the maximum number of client connections.
# increase this if you need to handle more clients
maxClientCnxns=60
dataLogDir=/zookeeper/zookeeper-3.4.14/logs

#
# Be sure to read the maintenance section of the
# administrator guide before turning on autopurge.
#
# http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance
#
# The number of snapshots to retain in dataDir
autopurge.snapRetainCount=3
# Purge task interval in hours
# Set to "0" to disable auto purge feature
autopurge.purgeInterval=1
server.0=master:2888:3888
server.1=slaver1:2888:3888
server.2=slaver2:2888:3888

​ 2、进入zookeeper-3.4.14目录

mkdir logs 
mkdir data
cd data
vim myid
##master 0 |  slaver1 1 |    slaver2 2(对应上面的zoo.cfg)

hadoop文件修改

进入hadoop 的/etc/hadoop

​ 1、vim hdfs-site.xml

<!--指定hdfs的nameservice为ns，需要和core‐site.xml中的保持一致-->
<property>
	<name>dfs.nameservices</name>
	<value>ns</value>
</property>
<!-- ns下面有两个NameNode，分别是nn1，nn2-->
<property>
	<name>dfs.ha.namenodes.ns</name>
	<value>nn1,nn2</value>
</property>
 <!-- nn1的RPC通信地址 -->
<property>
	<name>dfs.namenode.rpc-address.ns.nn1</name>
	<value>master:9000</value>
</property>
<!-- nn1的http通信地址 -->
<property>
	<name>dfs.namenode.http-address.ns.nn1</name>
	<value>master:50070</value>
</property>
<!-- nn2的RPC通信地址-->
<property>
	<name>dfs.namenode.rpc-address.ns.nn2</name>
	<value>slaver1:9000</value>
</property>
<!-- nn2的http通信地址-->
<property>
	<name>dfs.namenode.http-address.ns.nn2</name>
	<value>slaver1:50070</value>
</property>
<!-- 指定NameNode的元数据在JournalNode上的存放位置 -->
<property>
	<name>dfs.namenode.shared.edits.dir</name>
	<value>qjournal://master:8485;slaver1:8485;slaver2:8485/ns</value>
</property>
<!-- 指定JournalNode在本地磁盘存放数据的位置 -->
<property>
	<name>dfs.journalnode.edits.dir</name>
	<value>/Hadoop/journal</value>
</property>
<!-- 开启NameNode故障时自动切换-->
<property>
	<name>dfs.ha.automatic-failover.enabled</name>
	<value>true</value>
</property>
<!-- 配置失败自动切换实现方式-->
<property>
	<name>dfs.client.failover.proxy.provider.ns</name>		 <value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value>
</property>
<!-- 配置隔离机制 -->
<property>
	<name>dfs.ha.fencing.methods</name>
	<value>sshfence</value>
</property>
<!-- 使用隔离机制时需要ssh免登陆 -->
<property>
	<name>dfs.ha.fencing.ssh.private-key-files</name>
	<value>/root/.ssh/id_rsa</value>
</property>
<property>
	<name>dfs.namenode.name.dir</name>
	<value>/Hadoop/hdfs/name</value>
</property>
<property>
	<name>dfs.datanode.data.dir</name>
	<value>/Hadoop/hdfs/data</value>
</property>
<property>
	<name>dfs.replication</name>
	<value>3</value>
</property>
<!-- 在NN和DN上开启WebHDFS (REST API)功能,不是必须-->
<property>
	<name>dfs.webhdfs.enabled</name>
	<value>true</value>
</property>
<!--dfs权限认证-->
<property>
    <name>dfs.permissions</name>
    <value>false</value>
</property>

​ 2、vim core-site.xml

<!-- 指定hdfs的nameservice为ns -->     
<property>
    <name>fs.defaultFS</name>
	<value>hdfs://ns</value>
</property>
<!--指定hadoop数据存放目录-->
<property>
    <name>hadoop.tmp.dir</name>
	<value>/Hadoop/hadoop-2.7.7/tmp</value>
</property>
<!--指定文件缓存大小-->
<property>
    <name>io.file.buffer.size</name>
	<value>4096</value>
</property>
<!--指定zookeeper地址-->
<property> 
    <name>ha.zookeeper.quorum</name>
	<value>master:2181,slaver1:2181,slaver2:2181</value>
</property>
<property>
    <name>ipc.client.connect.max.retries</name>
    <value>100</value>
    <description>Indicates the number of retries a client will make to establish a server connection.
    </description>
</property>
<property>
    <name>ipc.client.connect.retry.interval</name>
    <value>10000</value>
    <description>Indicates the number of milliseconds a client will wait for
        before retrying to establish a server connection.
    </description>
</property>

​ 3、vim mapred-site.xml

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

​ 4、vim yarn-site.xml

<property>
    <name>yarn.nodemanager.aux-services</name>
    <value>mapreduce_shuffle</value>
</property>
<property>
    <name>yarn.resourcemanager.hostname</name>
    <value>slaver2</value>
</property>

​ 5、vim hadoop-env.sh

export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.242.b08-0.el7_7.x86_64/

​ 6、vim slaves (指定datanode)

master
slaver1
slaver2	

发送zookeeper和hadoop到slaver1 、slaver2

scp -r /Hadoop/ root@slaver1:/

scp -r /Hadoop/ root@slaver2:/

scp -r /zookeeper/ root@slaver1:/

scp -r /zookeeper/ root@slaver2:/

启动zookeeper

#进入zookeeper的bin目录
cd /zookeeper/zookeeper-3.4.14/bin/

#启动zookeeper
./zkServer.sh start 

#查看 zookeeper 状态
./zkServer.sh status

#jps查看
2385 QuorumPeerMain 
2511 Jps

启动hadoop

​ 初始化启动

​ 1、在master、slaver1、slaver2分别启动journalNode

#进入sbin目录
cd /usr/hadoop/hadoop-2.7.3/sbin/

#启动journalNode
./hadoop-daemon.sh start journalnode

#jps查看
2385 QuorumPeerMain 
2462 JournalNode
2511 Jps

​ 2、master上格式化zkfc和hdfs（初始化需要）

hdfs zkfc -formatZK

hadoop namenode -format

​ 3、master启动namenode（active）

./hadoop-daemon.sh start namenode

​ 4、slaver1上启动standby nameNode

hdfs namenode -bootstrapStandby

./hadoop-daemon.sh start namenode

​ 5、master启动datanode

./hadoop-daemons.sh start datanode

​ 6、slaver2启动yarn

./start-yarn.sh

​ 7、master启动zkfc

./hadoop-daemons.sh start zkfc

​ 8、jps查看

#master
jps

3776 DataNode
3953 JournalNode
8433 Jps
4306 NodeManager
1603 QuorumPeerMain
4087 DFSZKFailoverController
3672 NameNode


#slaver1
jps

3057 NameNode
1619 QuorumPeerMain
3203 JournalNode
5173 Jps
3127 DataNode
3369 NodeManager
3278 DFSZKFailoverController

#slaver2
jps

10003 DataNode
13702 Jps
9354 QuorumPeerMain
10174 NodeManager
10079 JournalNode
2808 ResourceManager

​ 9、全部启动和全部关闭

#全部启动
./start-all.sh

#全部关闭
./stop-all.sh

​ 10、登录master（ip）:50070或者进入slaver1:50070可以看到网站。

​ 登录master:8042或者slaver1:8042可以看到网站

​ 具体见下面说明：

​ 管理界面：http://ip:8088

​ NameNode界面：http://ip:50070

​ HDFS NameNode界面：http://ip:8042

​#### 未完待续