hadoop2.6 HA部署

落日映苍穹つ 2022-07-08 15:27 119阅读 0赞

硬件环境：四台虚拟机，hadoop1~hadoop4，3G内存，60G硬盘，2核CPU

软件环境：CentOS6.5，hadoop-2.6.0-cdh5.8.2，JDK1.7

部署规划：

hadoop1（192.168.0.3）：namenode（active）、resourcemanager

hadoop2（192.168.0.4）：namenode（standby）、journalnode、datanode、nodemanager、historyserver

hadoop3（192.168.0.5）：journalnode、datanode、nodemanager

hadoop4（192.168.0.6）：journalnode、datanode、nodemanager

HDFS的HA采用QJM的方式（journalnode）：

![wKioL1hfaVvxIDrYAABwJHpOeAA205.png-wh\_50][wKioL1hfaVvxIDrYAABwJHpOeAA205.png-wh_50]

一、系统准备

1、**每台机关闭selinux**

\#vi /etc/selinux/config

SELINUX=disabled

2、**每台机关闭防火墙（切记要关闭，否则格式化hdfs时会报错无法连接journalnode）**

\#chkconfig iptables off

\#service iptables stop

3、**每台机安装jdk1.7**

\#cd /software

\#tar -zxf jdk-7u65-linux-x64.gz -C /opt/

\#cd /opt

\#ln -s jdk-7u65-linux-x64.gz java

\#vi /etc/profile

export JAVA\_HOME=/opt/java

export PATH=$PATH:$JAVA\_HOME/bin

4、**每台机建立hadoop相关用户，并建立互信**

\#useradd grid

\#passwd grid

（建立互信步骤略）

**5、每台机建立相关目录**

\#mkdir -p /hadoop\_data/hdfs/name

\#mkdir -p /hadoop\_data/hdfs/data

\#mkdir -p /hadoop\_data/hdfs/journal

\#mkdir -p /hadoop\_data/yarn/local

\#chown -R grid:grid /hadoop\_data

二、hadoop部署

HDFS HA主要是指定nameservices（如果不做HDFS ferderation，就只会有一个ID），同时指定该

nameserviceID下面的两个namenode及其地址。此处的nameservice名设置为hadoop-spark

1、每台机解压hadoop包

\#cd /software

\#tar -zxf hadoop-2.6.0-cdh5.8.2.tar.gz -C /opt/

\#cd /opt

\#chown -R grid:grid hadoop-2.6.0-cdh5.8.2

\#ln -s hadoop-2.6.0-cdh5.8.2 hadoop

2、切换到grid用户继续操作

\#su - grid

$cd /opt/hadoop/etc/hadoop

3、配置hadoop-env.sh（其实只配置JAVA\_HOME）

$vi hadoop-env.sh

\# The java implementation to use.

export JAVA\_HOME=/opt/java

4、设置hdfs-site.xml

<name>dfs.replication</name>

</property>

<name>dfs.nameservices</name>

<value>hadoop-spark</value>

Comma-separated list of nameservices.

</description>

</property>

<name>dfs.ha.namenodes.hadoop-spark</name>

The prefix for a given nameservice, contains a comma-separated

list of namenodes for a given nameservice (eg EXAMPLENAMESERVICE).

</description>

</property>

<name>dfs.namenode.rpc-address.hadoop-spark.nn1</name>

<value>hadoop1:8020</value>

RPC address for nomenode1 of hadoop-spark

</description>

</property>

<name>dfs.namenode.rpc-address.hadoop-spark.nn2</name>

<value>hadoop2:8020</value>

RPC address for nomenode2 of hadoop-spark

</description>

</property>

<name>dfs.namenode.http-address.hadoop-spark.nn1</name>

<value>hadoop1:50070</value>

The address and the base port where the dfs namenode1 web ui will listen on.

</description>

</property>

<name>dfs.namenode.http-address.hadoop-spark.nn2</name>

<value>hadoop2:50070</value>

The address and the base port where the dfs namenode2 web ui will listen on.

</description>

</property>

<name>dfs.namenode.name.dir</name>

<value>file:///hadoop\_data/hdfs/name</value>

<description>Determines where on the local filesystem the DFS name node

should store the name table(fsimage).  If this is a comma-delimited list

of directories then the name table is replicated in all of the

directories, for redundancy. </description>

</property>

<name>dfs.namenode.shared.edits.dir</name>

<value>qjournal://hadoop2:8485;hadoop3:8485;hadoop4:8485/hadoop-spark</value>

<description>A directory on shared storage between the multiple namenodes

in an HA cluster. This directory will be written by the active and read

by the standby in order to keep the namespaces synchronized. This directory

does not need to be listed in dfs.namenode.edits.dir above. It should be

left empty in a non-HA cluster.

</description>

</property>

<name>dfs.datanode.data.dir</name>

<value>file:///hadoop\_data/hdfs/data</value>

<description>Determines where on the local filesystem an DFS data node

should store its blocks.  If this is a comma-delimited

list of directories, then data will be stored in all named

directories, typically on different devices.

Directories that do not exist are ignored.

</description>

</property>

<name>dfs.client.failover.proxy.provider.hadoop-spark</name>

<value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value>

</property>

<name>dfs.ha.automatic-failover.enabled</name>

<value>false</value>

Whether automatic failover is enabled. See the HDFS High

Availability documentation for details on automatic HA

configuration.

</description>

</property>

<name>dfs.journalnode.edits.dir</name>

<value>/hadoop\_data/hdfs/journal</value>

</property>

</configuration>

5、**配置core-site.xml（配置fs.defaultFS，使用HA的nameservices名称）**

<name>fs.defaultFS</name>

<value>hdfs://hadoop-spark</value>

<description>The name of the default file system.  A URI whose

scheme and authority determine the FileSystem implementation.  The

uri's scheme determines the config property (fs.SCHEME.impl) naming

the FileSystem implementation class.  The uri's authority is used to

determine the host, port, etc. for a filesystem.</description>

</property>

6、**配置mapred-site.xml**

<name>mapreduce.framework.name</name>

<description>The runtime framework for executing MapReduce jobs.

Can be one of local, classic or yarn.

</description>

</property>

<name>mapreduce.jobhistory.address</name>

<value>hadoop2:10020</value>

<description>MapReduce JobHistory Server IPC host:port</description>

</property>

<name>mapreduce.jobhistory.webapp.address</name>

<value>hadoop2:19888</value>

<description>MapReduce JobHistory Server Web UI host:port</description>

</property>

</configuration>

7、**配置yarn-site.xml**

<description>The hostname of the RM.</description>

<name>yarn.resourcemanager.hostname</name>

<value>hadoop1</value>

</property>

<description>The address of the applications manager interface in the RM.</description>

<name>yarn.resourcemanager.address</name>

<value>$\{yarn.resourcemanager.hostname\}:8032</value>

</property>

<description>The address of the scheduler interface.</description>

<name>yarn.resourcemanager.scheduler.address</name>

<value>$\{yarn.resourcemanager.hostname\}:8030</value>

</property>

<description>The http address of the RM web application.</description>

<name>yarn.resourcemanager.webapp.address</name>

<value>$\{yarn.resourcemanager.hostname\}:8088</value>

</property>

<description>The https adddress of the RM web application.</description>

<name>yarn.resourcemanager.webapp.https.address</name>

<value>$\{yarn.resourcemanager.hostname\}:8090</value>

</property>

<name>yarn.resourcemanager.resource-tracker.address</name>

<value>$\{yarn.resourcemanager.hostname\}:8031</value>

</property>

<description>The address of the RM admin interface.</description>

<name>yarn.resourcemanager.admin.address</name>

<value>$\{yarn.resourcemanager.hostname\}:8033</value>

</property>

<description>The class to use as the resource scheduler.</description>

<name>yarn.resourcemanager.scheduler.class</name>

<value>org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler</value>

</property>

<description>fair-scheduler conf location</description>

<name>yarn.scheduler.fair.allocation.file</name>

<value>$\{yarn.home.dir\}/etc/hadoop/fairscheduler.xml</value>

</property>

<description>List of directories to store localized files in. An

application's localized file directory will be found in:

$\{yarn.nodemanager.local-dirs\}/usercache/$\{user\}/appcache/application\_$\{appid\}.

Individual containers' work directories, called container\_$\{contid\}, will

be subdirectories of this.

</description>

<name>yarn.nodemanager.local-dirs</name>

<value>/hadoop\_data/yarn/local</value>

</property>

<description>Whether to enable log aggregation</description>

<name>yarn.log-aggregation-enable</name>

</property>

<description>Where to aggregate logs to.</description>

<name>yarn.nodemanager.remote-app-log-dir</name>

</property>

<description>Amount of physical memory, in MB, that can be allocated

for containers.</description>

<name>yarn.nodemanager.resource.memory-mb</name>

</property>

<description>Number of CPU cores that can be allocated

for containers.</description>

<name>yarn.nodemanager.resource.cpu-vcores</name>

</property>

<description>the valid service name should only contain a-zA-Z0-9\_ and can not start with numbers</description>

<name>yarn.nodemanager.aux-services</name>

<value>mapreduce\_shuffle</value>

</property>

</configuration>

8、**配置slaves**

hadoop2

hadoop3

hadoop4

9、**配置fairscheduler.xml**

<?xml version="1.0"?>

<minResources>0mb, 0 vcores </minResources>

<maxResources>6144 mb, 6 vcores </maxResources>

</queue>

</allocations>

10、**同步配置文件到各个节点**

$cd /opt/hadoop/etc

$scp -r hadoop hadoop2:/opt/hadoop/etc/

$scp -r hadoop hadoop3:/opt/hadoop/etc/

$scp -r hadoop hadoop4:/opt/hadoop/etc/

三、启动集群（格式化文件系统）

1、建立环境变量

$**vi ~/.bash\_profile**

export HADOOP\_HOME=/opt/hadoop

export YARN\_HOME\_DIR=/opt/hadoop

export HADOOP\_CONF\_DIR=/opt/hadoop/etc/hadoop

export YARN\_CONF\_DIR=/opt/hadoop/etc/hadoop

2、启动HDFS

先启动journalnode，在hadoop2~hadoop4上：

$cd /opt/hadoop/

$**sbin/hadoop-daemon.sh start journalnode**

格式化HDFS，然后启动namenode。在hadoop1上：

$bin/hdfs namenode -format

$sbin/hadoop-daemon.sh start namenode

同步另一个namenode，并启动。在hadoop2上：

$bin/hdfs namenode -bootstrapStandby

$sbin/hadoop-daemon.sh start namenode

此时两个namenode都是standby状态，将hadoop1切换成active（hadoop1在hdfs-site.xml里对应的是nn1）：

$bin/hdfs haadmin -transitionToActive nn1

启动datanode。在hadoop1上（active的namenode）：

$sbin/hadoop-daemons.sh start datanode

注意事项：**后续启动，只需使用sbin/start-dfs.sh即可。但由于没有配置zookeeper的failover，所以只能HA只能使用手工切换。所以每次启动HDFS，都要执行$bin/hdfs haadmin -transitionToActive nn1来使hadoop1的namenode变成active状态**

2、启动yarn

在hadoop1上（resourcemanager）：

$sbin/start-yarn.sh

————————————————————————————————————————————

以上配置的HDFS HA并不是自动故障切换的，如果配置HDFS自动故障切换，需要添加以下步骤（先停掉集群）：

1、部署zookeeper，步骤省略。部署在hadoop2、hadoop3、hadoop4，并启动

2、**在hdfs-site.xml中添加：**

<name>dfs.ha.automatic-failover.enabled</name>

</property>

<name>dfs.ha.fencing.methods</name>

<value>sshfence</value>

</property>

<name>dfs.ha.fencing.ssh.private-key-files</name>      <value>/home/exampleuser/.ssh/id\_rsa</value>

/property>

解释详见官方文档。这样配置设定了fencing方法是通过ssh去关闭前一个活动节点的端口。前提前两个namenode能互相SSH。

还有另外一种配置方法：

<name>dfs.ha.automatic-failover.enabled</name>

</property>

<name>dfs.ha.fencing.methods</name>

<value>shell(/path/to/my/script.sh arg1 arg2 ...)</value>

</property>

这样的配置实际上是使用shell来隔绝端口和程序。如果不想做实际的动作，dfs.ha.fencing.methods可配置成shell(/bin/true)

3、在core-site.xml中添加：

<name>ha.zookeeper.quorum</name>

<value>hadoop2:2181,hadoop3:2181,hadoop4:2181</value>

</property>

4、初始化zkfc（在namenode上执行）

bin/hdfs zkfc -formatZK

5、启动集群

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

zkfc：每个namenode上都运行，是zk的客户端，负责自动故障切换

zk：奇数个节点，维护一致性锁、负责选举活动节点

joural node：奇数个节点，用于active和standby节点之间数据同步。活动节点把数据写入这些节点，standby节点读取

————————————————————————————————————————————

更改成resourcemanager HA：

选择hadoop2作为另一个rm节点

1、设置hadoop2对其它节点作互信

2、编译yarn-site.xml并同步到其它机器

3、复制fairSheduler.xml到hadoop2

4、启动rm

5、启动另一个rm

![wKiom1bb\_8ixv4tzAABF1jn3bcU061.png][wKiom1bb_8ixv4tzAABF1jn3bcU061.png]

配置文件

1.core配置：

\[qujian@master hadoop\]$ vim core-site.xml

<name>fs.defaultFS</name>

<value>hdfs://mycluster</value>

</property>

<name>io.file.buffer.size</name>

</property>

<name>hadoop.tmp.dir</name>

<value>file:/home/qujian/hadoop-2.7.2/tmp</value>

</property>

<name>ha.zookeeper.quorum</name>

<value>master.hadoop.cn:2181,second1.hadoop.cn:2181,second2.hadoop.cn:2181</value>

</property>

<name>ha.zookeeper.session-timeout.ms</name>

</property>

修改mapred-site.xml

<name>mapreduce.framework.name</name>

</property>

修改yarn-site.xml

<name>yarn.nodemanager.aux-services</name>

<value>mapreduce\_shuffle</value>

</property>

<name>yarn.nodemanager.aux-services.mapreduce\_shuffle.class</name>

<value>org.apache.hadoop.mapred.ShuffleHandler</value>

</property>

<name>yarn.resourcemanager.address</name>

<value>master.hadoop.cn:8032</value>

</property>

<name>yarn.resourcemanager.scheduler.address</name>

<value>master.hadoop.cn:8030</value>

</property>

<name>yarn.resourcemanager.resource-tracker.address</name>

<value>master.hadoop.cn:8031</value>

</property>

<name>yarn.resourcemanager.admin.address</name>

<value>master.hadoop.cn:8033</value>

</property>

<name>yarn.resourcemanager.webapp.address</name>

<value>master.hadoop.cn:8088</value>

</property>

修改hdfs-site.xml

<name>dfs.namenode.name.dir</name>

<value>file:/home/qujian/hadoop-2.7.2/name</value>

</property>

<name>dfs.datanode.data.dir</name>

<value>file:/home/qujian/hadoop-2.7.2/data</value>

</property>

<name>dfs.replication</name>

</property>

<name>dfs.webhdfs.enabled</name>

</property>

<name>dfs.permissions.enabled</name>

<value>false</value>

</property>

<name>dfs.nameservices</name>

<value>mycluster</value>

</property>

<name>dfs.ha.namenodes.mycluster</name>

</property>

<name>dfs.namenode.rpc-address.mycluster.nn1</name>

<value>master.hadoop.cn:9000</value>

</property>

<name>dfs.namenode.rpc-address.mycluster.nn2</name>

<value>second1.hadoop.cn:9000</value>

</property>

<name>dfs.namenode.servicerpc-address.mycluster.nn1</name>

<value>master.hadoop.cn:53310</value>

</property>

<name>dfs.namenode.servicerpc-address.mycluster.nn2</name>

<value>second1.hadoop.cn:53310</value>

</property>

<name>dfs.namenode.http-address.mycluster.nn1</name>

<value>master.hadoop.cn:50070</value>

</property>

<name>dfs.namenode.http-address.mycluster.nn2</name>

<value>second1.hadoop.cn:50070</value>

</property>

<name>dfs.namenode.shared.edits.dir</name>

<value>qjournal://second2.hadoop.cn:8485;data1.hadoop.cn:8485;data2.hadoop.cn:8485/mycluster</value>

</property>

<name>dfs.client.failover.proxy.provider.mycluster</name>

<value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value>

</property>

<name>dfs.ha.fencing.methods</name>

<value>sshfence</value>

</property>

<name>dfs.ha.fencing.ssh.private-key-files</name>

<value>/home/qujian/.ssh/id\_rsa</value>

</property>

<name>dfs.ha.fencing.ssh.connect-timeout</name>

</property>

<name>dfs.journalnode.edits.dir</name>

<value>/home/qujian/hadoop-2.7.2/journal</value>

</property>

<name>dfs.ha.automatic-failover.enabled</name>

</property>

<name>ha.failover-controller.cli-check.rpc-timeout.ms</name>

</property>

<name>ipc.client.connect-timeout</name>

</property>

<name>dfs.image.transfer.bandwidthPerSec</name>

</property>

配置data服务器：

\[qujian@master hadoop\]$ cat slaves

second2.hadoop.cn

data1.hadoop.cn

data2.hadoop.cn

for n in second1.hadoop.cn second2.hadoop.cn data1.hadoop.cn data2.hadoop.cn

scp -rp /home/qujian/hadoop-2.7.2 $n:~/

wait

done

四台机器 bei1 bei2 bei3 bei4

1、升级组件以及关闭防火墙

yum -y update

PS: 如果使用本地yum源可省略该项

新开终端在升级组件的同时操作减少等待时间

\# service iptables stop

\# chkconfig iptables off

2、修改/etc/hosts文件中IP与主机映射关系

\# vi /etc/hosts

192.168.31.131bei1

192.168.31.132bei2

192.168.31.133bei3

192.168.31.134bei4

3、如果是虚拟机修改/etc/sysconfig/network-scripts/ifcfg-eth0删除UUID和MAC地址

\# vi /etc/sysconfig/network-scripts/ifcfg-eth0

4、删除/etc/udev/rules.d/70-persistent-net.rules 默认网卡MAC生成规则文件

\# rm -rf /etc/udev/rules.d/70-persistent-net.rules

PS:如果是其它NODE节点不是虚拟机克隆或者源虚拟机复制的可省略第3、4两项

5、yum升级后重启主机

6、准备环境

6.1、yum -y install gcc gcc-c++ autoconf automake cmake ntp rsync ssh vim

yum -y install zlib zlib-devel openssl openssl-devel pcre-devel

PS：以上一些程序可能对于hadoop并不需要但为了以后安装其它程序可能会用到尤其是源码安装

其中重要的三个程序是必须安装的

ssh用于节点间通信 我选用的是CentOS6.7的版本默认已经安装了openssh

rsync用于远程同步

ntp用于时间同步

6.2、当6.1中第一个yum安装完成后新开终端进行NTP时间同步该项很重要

6.2.1配置ntp启动项

chkconfig ntpd on

6.2.2同步时间

ntpdate ntp.sjtu.edu.cn

6.2.3启动ntpd服务

/etc/init.d/ntpd start

6.2.4验证ntp服务已经运行

pgrep ntpd

6.2.5初始同步

ntpdate -u ntp.sjtu.edu.cn

6.2.6确认同步成功

ntpq -p

PS:可以一次性输入以上命令

chkconfig ntpd on

ntpdate ntp.sjtu.edu.cn

/etc/init.d/ntpd start

pgrep ntpd

ntpdate -u ntp.sjtu.edu.cn

ntpq -p

等待6.2.1yum成功后建议重启主机

7、安装jdk

7.1 将jdk考到家目录中

7.2 rpm -ivh jdk\_xxxxxxxx.rpm

7.3 jdk安装目录默认为/usr/java/jdk1.7.0\_79

7.4 配置jdk环境变量

\# vim ~/.bash\_profile

增加以下四行

export JAVA\_HOME=/opt/sxt/soft/jdk1.7.0\_80

export PATH=$PATH:$JAVA\_HOME/bin

export HADOOP\_HOME=/opt/sxt/soft/hadoop-2.5.1

export PATH=$PATH:HADOOP\_HOME/bin:$HADOOP\_HOME/sbin

编辑完成后使用source命令使文件~/.bash\_profile生效执行以下命令

source ~/.bash\_profile

检查环境变量

printenv

8、安装tomcat (这步可省略，不过以后肯定有用)

将tomcat拷贝到/opt/sxt下解压

\# tar -zxvf apache-tomcat-xxxxx.tar.gz

9、将Hadoop 上传到/opt/sxt

\# tar -zxvf hadoop-2.5.1\_x64.tar.gz

9.1 创建hadoop.tmp.dir目录及创建

\# mkdir -p /opt/hadooptmp

9.2 etc/hadoop/core-site.xml:

<name>fs.defaultFS</name>

<value>hdfs://bjsxt</value>

</property>

<name>ha.zookeeper.quorum</name>

</property>

<name>hadoop.tmp.dir</name>

<value>/opt/hadooptmp</value>

</property>

9.3 etc/hadoop/hdfs-site.xml:

<name>dfs.nameservices</name>

<value>bjsxt</value>

</property>

<name>dfs.ha.namenodes.bjsxt</name>

</property>

<name>dfs.namenode.rpc-address.bjsxt.nn1</name>

</property>

<name>dfs.namenode.rpc-address.bjsxt.nn2</name>

</property>

<name>dfs.namenode.http-address.bjsxt.nn1</name>

</property>

<name>dfs.namenode.http-address.bjsxt.nn2</name>

</property>

<name>dfs.namenode.shared.edits.dir</name>

<value>qjournal://bei2:8485;bei3:8485;bei4:8485/bjsxt</value>

</property>

<name>dfs.client.failover.proxy.provider.bjsxt</name>

<value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value>

</property>

<name>dfs.ha.fencing.methods</name>

<value>sshfence</value>

</property>

<name>dfs.ha.fencing.ssh.private-key-files</name>

</property>

<name>dfs.journalnode.edits.dir</name>

<value>/opt/hadooptmp/data</value>

</property>

<name>dfs.ha.automatic-failover.enabled</name>

</property>

9.4 克隆

9.5 修改主机名 IP 网关 mac

修改主机名

vim /etc/sysconfig/network

修改IP地址

vi /etc/sysconfig/network-scripts/ifcfg-eth0

修改DNS

vi /etc/resolv.conf 中的search ，nameserver

10、检查ssh本地免密码登录

10.1 第一次检查

ssh localhost

PS:远程成功后记得exit退出

10.2 创建本地秘钥并将公共秘钥写入认证文件

\# ssh-keygen -t dsa -P '' -f ~/.ssh/id\_dsa

\# cat ~/.ssh/id\_dsa.pub >> ~/.ssh/authorized\_keys

10.3 再次检查

ssh localhost

PS：同样exit退出

10.4 在NameNode上将~/.ssh/authorized\_keys文件复制到各节点上

scp ~/.ssh/authorized\_keys root@hadoopsnn:~/.ssh/authorized\_keys

scp ~/.ssh/authorized\_keys root@hadoopdn1:~/.ssh/authorized\_keys

scp ~/.ssh/authorized\_keys root@hadoopdn2:~/.ssh/authorized\_keys

10.5 编写/opt/sxt/soft/hadoop-2.5.1/etc/hadoop/hadoop-env.sh文件默认 hadoop取不到用户环境变量里的JAVA\_HOME所以要手动指定

vim /opt/sxt/soft/hadoop-2.5.1/etc/hadoop/hadoop-env.sh

找到export JAVA\_HOME=$\{JAVA\_HOME\}

修改为export JAVA\_HOME=/opt/sxt/soft/jdk1.7.0\_80

增加以下一行

export HADOOP\_PREFIX=/opt/sxt/soft/hadoop-2.5.1

11、 配置安装zookeeper

11.1 三台zookeeper：bei1，bei2，bei3

11.2 编辑zoo.cfg配置文件

修改dataDir=/opt/sxt/zookeeperdatadir

tickTime=2000

dataDir=/opt/sxt/zookeeperdatadir

clientPort=2181

initLimit=5

syncLimit=2

server.1=bei1:2888:3888

server.2=bei2:2888:3888

server.3=bei3:2888:3888

11.3 在dataDir目录中创建一个myid的文件，文件内容为1，2，3

12、配置hadoop中的slaves  其中放置的是NN

\*\*\*\*\*\*\*这一步开始要认真按步骤做，若修改配置文件了，服务需要重启\*\*\*\*\*\*\*

13、启动三个zookeeper：/opt/sxt/zookeeper-3.4.6/bin/zkServer.sh start

14、启动三个JournalNode：./hadoop-daemon.sh start journalnode

15、在其中一个namenode上格式化：bin/hdfs namenode -format

16、把刚刚格式化之后的元数据拷贝到另外一个namenode上

16.1启动刚刚格式化的namenode :hadoop-daemone.sh start namenode

16.2在没有格式化的namenode上执行：hdfs namenode -bootstrapStandby

16.3启动第二个namenode

17、在其中一个namenode上初始化zkfc：hdfs zkfc -formatZK

18、停止上面节点：stop-dfs.sh

19、全面启动：start-dfs.sh

20、登录页面jps检查 登录页面检查

搭建准备

1、下载安装包

Hadoop： wget http://apache.fayea.com/hadoop/common/hadoop-2.7.1/hadoop-2.7.1.tar.gz

Hbase： wget http://apache.fayea.com/hbase/1.1.4/hbase-1.1.4-bin.tar.gz

2、JDK安装与配置。

3、SSH免密码登录。参考： SSH免密码登录

4、zookeeper-3.4.7安装与配置。 参考： Debian环境——ZooKeeper集群安装配置

创建用户

1、以root用户登录。

2、创建用户组hadoop 命令： groupadd hadoop

3、创建hadoop用户： sudo useradd -s /bin/bash -d /home/hadoop -m hadoop -g hadoop -G root

4、修改密码： passwd hadoop 。 根据提示两次输入需要设置的密码。

5、root用户跳转到hadoop 用户命令： su hadoop

6、跳转到hadoop 的根路径： cd

7、配置环境变量， 编辑命令： vim .bashrc

\[java\] view plain

alias ll='ls -l'

export JAVA\_HOME=/usr/local/jdk1.7.0\_80/

export JRE\_HOME=/usr/local/jdk1.7.0\_80/jre

export CLASSPATH=.:$CLASSPATH:$JAVA\_HOME/lib:$JRE\_HOME/lib

export PATH=$PATH:$JAVA\_HOME/bin:$JRE\_HOME/bin

8、保存退出。 使配置生效命令： source .bashrc 。

Hadoop HA搭建

1、解压： tar -zxvf hadoop-2.7.1.tar.gz

2、进入： cd hadoop-2.7.1/etc/hadoop/

3、进入配置文件目录后， 配置如下文件。

（1） hadoop-env.sh 。该文件中配置JAVA\_HOME的路径：

export JAVA\_HOME=/usr/local/jdk1.7.0\_80/

（2）core-site.xml 。推荐配置：

\[java\] view plain

<name>fs.defaultFS</name>

</property>

<name>hadoop.tmp.dir</name>

<value>/home/hadoop/tmp</value>

</property>

<name>ha.zookeeper.quorum</name>

</property>

</configuration>

（3）hdfs-site.xml 。 推荐配置：

\[java\] view plain

<value>/home/hadoop/tmp/name</value>

</property>

<value>/home/hadoop/tmp/data</value>

</property>

<name>dfs.replication</name>

</property>

<name>dfs.nameservices</name>

</property>

<name>dfs.ha.namenodes.ns</name>

</property>

<name>dfs.namenode.rpc-address.ns.hdp1</name>

</property>

<name>dfs.namenode.http-address.ns.hdp1</name>

</property>

<name>dfs.namenode.rpc-address.ns.hdp2</name>

</property>

<name>dfs.namenode.http-address.ns.hdp2</name>

</property>

<name>dfs.namenode.shared.edits.dir</name>

<value>qjournal://hdp3:8485;hdp4:8485/ns</value>

</property>

<name>dfs.ha.automatic-failover.enabled.ns</name>

</property>

<name>dfs.client.failover.proxy.provider.ns</name>

<value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value>

</property>

<name>dfs.journalnode.edits.dir</name>

<value>/home/hadoop/tmp/journal</value>

</property>

<name>dfs.ha.fencing.methods</name>

<value>sshfence</value>

</property>

<name>dfs.ha.fencing.ssh.private-key-files</name>

</property>

</configuration>

（4）mapred-site.xml 。 推荐配置：

\[java\] view plain

<name>mapreduce.framework.name</name>

</property>

</configuration>

（5）yarn-site.xml 。 推荐配置：

\[java\] view plain

<name>yarn.resourcemanager.hostname</name>

</property>

<name>yarn.nodemanager.aux-services</name>

<value>mapreduce\_shuffle</value>

</property>

</configuration>

（6）slaves 。 文件配置（数据节点的配置）：

\[java\] view plain

hdp1

hdp2

hdp3

hdp4

注意： 这里hosts中已经配置：

\[java\] view plain

172.16.1.227 hdp1

172.16.1.228 hdp2

172.16.1.229 hdp3

172.16.1.230 hdp4

其中： zookeeper集群： hdp1,hdp2,hdp3 。

4、拷贝。 将hadoop-2.7.1拷贝到其他节点上去。

使用命令形如： scp -r hadoop-2.7.1 hadoop@172.16.1.226:/home/hadoop/

5、Zookeeper集群上建立HA

hdp1的hadoop-2.7.1/bin路径下（手输入）命令： ./hdfs zkfc -formatZK

包含成功信息如下： Successfully created /hadoop-ha/ns in ZK.

6、启动journalnode。

根据hdfs-site.xml配置， 启动hdp3， hdp4上的journalnode。

在其各自节点上hadoop-2.7.1/sbin路径下执行如下命令：

**./hadoop-daemon.sh start journalnode**

输入 jps 命令查看启动的 JournalNode 进程。

7、格式化NameNode。

（1）在hdp1的hadoop-2.7.1/bin执行命令：

**./hdfs namenode -format -clusterId ss**

（2）格式化成功包含如下信息： Storage directory /home/hadoop/tmp/name has been successfully formatted.

（3）将该命令生成的信息拷贝到hdp2上（hdp2）将作为备用的NameNode。

（4）执行命令：

scp -r /home/hadoop/ root@hdp2:/home/hadoop/ （Namenode信息路径见配置文件hdfs-site.xml的dfs.name.dir） 。

8、进入主节点hdp1，启动hadoop集群。

进入hadoop-2.7.1/sbin/路径启动hadoop集群， 使用命令：

**./start-all.sh**

9、启动验证。

（1）使用jps命运， 查看各个节点的进程。

主节点有： NameNode 和 ResourceManager 等进程； 从节点有： DataNode 和 NodeManager 进程；

（2）浏览器访问，两个namenode的网页

http://hdp1:50070/

http://hdp2:50070/

此时可以看到两个namenode都处于standby 状态； Datanodes菜单项下，可以查看datanode列表。

10、激活NameNode 。

先后在hdp1， hdp2两个namenode的hadoop/sbin/执行命令：

./hadoop-daemon.sh start zkfc ； 貌似哪个节点先执行， 那个节点就最新处于alive状态；

jps可查看到DFSZKFailoverController进程。

简单测试

进入hadoop-2.7.1/bin/路径下执行命令

1、显示hdfs根路径： ./hadoop fs -ls /

2、本地创建一个txt文件， 上传文件到hdfs： ./hadoop fs -put test.txt /

3、查看已经上传的文件： ./hadoop fs -text /test.txt

4、若能正常打印文件中的内容， 说明简单测试通过。

环境变量配置

1、编辑环境变量文件： vim .bashrc

2、配置。

（1）PATH之前新增： export HADOOP\_HOME=/home/hadoop/hadoop-2.7.1

（2）PATH新增： :$HADOOP\_HOME/bin:$HADOOP\_HOME/sbin

3、保存退出。 使配置文件生效： source .bashrc

hadoop-daemon.sh与hadoop-daemons.sh区别

**hadoop-daemon.sh只能本地执行**

**hadoop-daemons.sh能远程执行**

1. 启动JN

hadoop-daemons.sh start journalnode

hdfs namenode -initializeSharedEdits

//复制edits log文件到journalnode节点上，第一次创建得在格式化namenode之后使用

http://hadoop-yarn1:8480来看journal是否正常

2.格式化namenode，并启动Active Namenode

一、Active NameNode节点上格式化namenode

hdfs namenode -format

hdfs namenode -initializeSharedEdits

初始化journalnode完毕

二、启动Active Namenode

hadoop-daemon.sh start namenode

3.启动 Standby namenode

一、Standby namenode节点上格式化Standby节点

复制Active Namenode上的元数据信息拷贝到Standby Namenode节点上

hdfs namenode -bootstrapStandby

二、启动Standby节点

hadoop-daemon.sh start namenode

4.启动Automatic Failover

在zookeeper上创建 /hadoop-ha/ns1这样一个监控节点(ZNode)

hdfs zkfc -formatZK

start-dfs.sh

5.查看namenode状态

hdfs  haadmin -getServiceState nn1

active

6.自动failover

hdfs  haadmin -failover nn1 nn2

配置文件详细信息

core-site.xml

<name>fs.defaultFS</name>

</property>

<name>hadoop.tmp.dir</name>

<value>/opt/modules/hadoop-2.2.0/data/tmp</value>

</property>

<name>fs.trash.interval</name>

</property>

<name>ha.zookeeper.quorum</name>

<value>hadoop-yarn1:2181,hadoop-yarn2:2181,hadoop-yarn3:2181</value>

</property>

<name>hadoop.http.staticuser.user</name>

<value>yuanhai</value>

</property>

</configuration>

hdfs-site.xml

<name>dfs.replication</name>

</property>

<name>dfs.nameservices</name>

</property>

<name>dfs.ha.namenodes.ns1</name>

</property>

<name>dfs.namenode.rpc-address.ns1.nn1</name>

<value>hadoop-yarn1:8020</value>

</property>

<name>dfs.namenode.rpc-address.ns1.nn2</name>

<value>hadoop-yarn2:8020</value>

</property>

<name>dfs.namenode.http-address.ns1.nn1</name>

<value>hadoop-yarn1:50070</value>

</property>

<name>dfs.namenode.http-address.ns1.nn2</name>

<value>hadoop-yarn2:50070</value>

</property>

<name>dfs.namenode.shared.edits.dir</name>

<value>qjournal://hadoop-yarn1:8485;hadoop-yarn2:8485;hadoop-yarn3:8485/ns1</value>

</property>

<name>dfs.journalnode.edits.dir</name>

<value>/opt/modules/hadoop-2.2.0/data/tmp/journal</value>

</property>

<name>dfs.ha.automatic-failover.enabled</name>

</property>

<name>dfs.client.failover.proxy.provider.ns1</name>

<value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value>

</property>

<name>dfs.ha.fencing.methods</name>

<value>sshfence</value>

</property>

<name>dfs.ha.fencing.ssh.private-key-files</name>

<value>/home/hadoop/.ssh/id\_rsa</value>

</property>

<name>dfs.permissions.enabled</name>

<value>false</value>

</property>

<!--     <property>

<name>dfs.namenode.http-address</name>

<value>hadoop-yarn.dragon.org:50070</value>

</property>

<name>dfs.namenode.secondary.http-address</name>

<value>hadoop-yarn.dragon.org:50090</value>

</property>

<name>dfs.namenode.name.dir</name>

<value>file://$\{hadoop.tmp.dir\}/dfs/name</value>

</property>

<name>dfs.namenode.edits.dir</name>

<value>$\{dfs.namenode.name.dir\}</value>

</property>

<name>dfs.datanode.data.dir</name>

<value>file://$\{hadoop.tmp.dir\}/dfs/data</value>

</property>

<name>dfs.namenode.checkpoint.dir</name>

<value>file://$\{hadoop.tmp.dir\}/dfs/namesecondary</value>

</property>

<name>dfs.namenode.checkpoint.edits.dir</name>

<value>$\{dfs.namenode.checkpoint.dir\}</value>

</property>

\-->

</configuration>

slaves

hadoop-yarn1

hadoop-yarn2

hadoop-yarn3

yarn-site.xml

<name>yarn.nodemanager.aux-services</name>

<value>mapreduce\_shuffle</value>

</property>

<name>yarn.resourcemanager.hostname</name>

<value>hadoop-yarn1</value>

</property>

<name>yarn.log-aggregation-enable</name>

</property>

<name>yarn.log-aggregation.retain-seconds</name>

</property>

</configuration>

mapred-site.xml

<name>mapreduce.framework.name</name>

</property>

<name>mapreduce.jobhistory.address</name>

<value>hadoop-yarn1:10020</value>

<description>MapReduce JobHistory Server IPC host:port</description>

</property>

<name>mapreduce.jobhistory.webapp.address</name>

<value>hadoop-yarn1:19888</value>

<description>MapReduce JobHistory Server Web UI host:port</description>

</property>

<name>mapreduce.job.ubertask.enable</name>

</property>

</configuration>

hadoop-env.sh

export JAVA\_HOME=/opt/modules/jdk1.6.0\_24

[wKioL1hfaVvxIDrYAABwJHpOeAA205.png-wh_50]: /images/20220708/1e5bb991f3fb4d419dbb588cfb548a9a.png
[wKiom1bb_8ixv4tzAABF1jn3bcU061.png]: /images/20220708/da748ab97c40495a94737439c9d3737f.png