Hadoop HA(HDFS高可用)集群搭建

本文搭建hadoop的环境为 centos7.9 Hadoop3.1.3 jdk-8u301 zookeeper-3.4.6，我们首先需要准备好三台虚拟机，修改好主机名，设置静态IP，关闭防火墙，关闭selinux，以其中一台master节点为例具体操作如下

[root@master ~]# yum -y install vim
[root@master ~]# vim /etc/hostname #只有一行，改为master,其他两台分别改为slave1,slave2
[root@master ~]# vim /etc/sysconfig/network-scripts/ifcfg-ens33 #内网下一般都是ens33，有些人的或许不同 但是都是-ensXX

只需修改有注释部分

TYPE="Ethernet"
PROXY_METHOD="none"
BROWSER_onLY="no"
BOOTPROTO="static" #将dhcp改为static
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
IPV6INIT="yes"
IPV6_AUTOCONF="yes"
IPV6_DEFROUTE="yes"
IPV6_FAILURE_FATAL="no"
IPV6_ADDR_GEN_MODE="stable-privacy"
NAME="ens33"
UUID="b5b8e893-1fbf-425c-a6c5-d679072ac952"
DEVICE="ens33"
onBOOT="yes"  #将NO改为yes
IPADDR="192.168.83.128" #设置为主机IP
PREFIX="24"             #此处和netmask=255.255.255.0等效
GATEWAY="192.168.83.2"  #网关
DNS1="192.168.83.2"     #DNS服务器 默认和网关相同
IPV6_PRIVACY="no"

接下来，关闭防火墙和selinux，代码如下

[root@master ~]# systemctl stop firewalld
[root@master ~]# systemctl disable firewalld
[root@master ~]# vim /etc/selinux/config #将SELINUX的值改为disabled
[root@master ~]# reboot #重启使配置生效

重启后就开始安装环境，首先先把各个安装包解压，使用Xftp或者rz将所有安装包放到指定目录下

[root@master opt]# mkdir /opt/software module #创建两个目录，将软件包放在software目录，解压在module目录下
[root@master software]# ll
总用量 489556
-rw-r--r-- 1 root root 338075860 9月  28 19:33 hadoop-3.1.3.tar.gz
-rw-r--r-- 1 root root 145520298 9月  28 19:33 jdk-8u301-linux-x64.tar.gz
-rw-r--r-- 1 root root  17699306 9月  28 19:33 zookeeper-3.4.6.tar.gz
[root@master software]# tar -zxvf jdk-8u301-linux-x64.tar.gz -C /opt/module/
[root@master software]# tar -zxvf hadoop-3.1.3.tar.gz -C /opt/module/
[root@master software]# tar -zxvf zookeeper-3.4.6.tar.gz -C /opt/module/

配置环境变量，新建一个文件存放我们自己的环境变量

[root@master module]# vim /etc/profile.d/my_env.sh

添加以下内容

#JAVA_HOME
export JAVA_HOME=/opt/module/jdk1.8.0_301
export PATH=$PATH:$JAVA_HOME/bin
#HADOOP_HOME
export HADOOP_HOME=/opt/module/hadoop-3.1.3
export PATH=$PATH:$HADOOP_HOME/bin
export PATH=$PATH:$HADOOP_HOME/sbin
#ZOOKEEPER_HOME
export ZOOKEEPER_HOME=/opt/module/zookeeper-3.4.6
export PATH=$PATH:$ZOOKEEPER_HOME/bin                                    

验证，使环境变量生效

[root@master module]# source /etc/profile
[root@master module]# java -version
java version "1.8.0_301"
Java(TM) SE Runtime Environment (build 1.8.0_301-b09)
Java HotSpot(TM) 64-Bit Server VM (build 25.301-b09, mixed mode)
[root@master module]# hadoop version
Hadoop 3.1.3
Source code repository https://gitbox.apache.org/repos/asf/hadoop.git -r ba631c436b806728f8ec2f54ab1e289526c90579
Compiled by ztang on 2019-09-12T02:47Z
Compiled with protoc 2.5.0
From source with checksum ec785077c385118ac91aadde5ec9799
This command was run using /opt/module/hadoop-3.1.3/share/hadoop/common/hadoop-common-3.1.3.jar

编写同步配置脚本,首先需要更改hosts文件，修改如下

192.168.83.128 master #分别对应 主机IP 主机名
192.168.83.129 slave1
192.168.83.130 slave2

验证 分别ping 对应主机 主机名 能ping通 说明hosts文件配置无误

[root@master module]# ping master
[root@master module]# ping slave1
[root@master module]# ping slave2

编写同步文件脚本 进到/usr/bin目录下

[root@master bin]# vim xsync

#!/bin/bash
#1. 判断参数个数
if [ $# -lt 1 ]
then
 echo Not Enough Arguement!
 exit;
fi
 
#2. 遍历集群所有机器
for host in master slave1 slave2
do
 echo ==================== $host ====================
 #3. 遍历所有目录，挨个发送
 for file in $@
 do
 #4. 判断文件是否存在
 if [ -e $file ]
 then
 #5. 获取父目录
 pdir=$(cd -P $(dirname $file); pwd)
 #6. 获取当前文件的名称
 fname=$(basename $file)
 ssh $host "mkdir -p $pdir"
 rsync -av $pdir/$fname $host:$pdir
 else
 echo $file does not exists!
 fi
 done
done

添加执行权限

[root@master bin]# chmod +x xsync

再安装脚本中使用的同步工具rsync

[root@master bin]# yum -y install rsync

将环境变量和解压软件的目录进行分发，分发前须做好SSH免密登录，方便操作，第一次使用SSH会有提示，输入yes即可，exit退回原终端，我们进到/root/.ssh目录下，该目录须使用过ssh后才会生成。

[root@master .ssh]# ssh-keygen -t rsa #三个主机都需进行
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): 
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:sbbwtp49+lktMLOcVLqrdlU7F0QS9xCHjakubPPCgWM root@master
The key's randomart image is:
+---[RSA 2048]----+
|             o=O.|
|              *+o|
|        .   ... .|
|         o o. .. |
|      . So*. . ..|
|       +E+*Bo.o .|
|       .++=*o .o |
|       ..+=+..   |
|       o*==o     |
+----[SHA256]-----+

将公钥拷贝到需免密登录的主机上(三个主机上都进行设置)

[root@master .ssh]# ssh-copy-id master
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
root@master's password: 

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'master'"
and check to make sure that only the key(s) you wanted were added

[root@master .ssh]# ssh-copy-id slave1
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
root@slave1's password: 

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'slave1'"
and check to make sure that only the key(s) you wanted were added.

[root@master .ssh]# ssh-copy-id slave2
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
root@slave2's password: 

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'slave2'"
and check to make sure that only the key(s) you wanted were added.

测试，分发环境变量my_env.sh文件

[root@master .ssh]# xsync /etc/profile.d/my_env.sh 
==================== master ====================
sending incremental file list

sent 47 bytes  received 12 bytes  118.00 bytes/sec
total size is 318  speedup is 5.39
==================== slave1 ====================
sending incremental file list
my_env.sh

sent 412 bytes  received 35 bytes  894.00 bytes/sec
total size is 318  speedup is 0.71
==================== slave2 ====================
sending incremental file list
my_env.sh

sent 412 bytes  received 35 bytes  298.00 bytes/sec
total size is 318  speedup is 0.71

配置hadoop集群，我们需要更改四个配置文件分别是core-site.xml hdfs-site.xml yarn-site.xml mapred-site.xml 进到/opt/module/hadoop-3.1.3/etc/hadoop目录下

core-site.xml配置如下

                
                        fs.defaultFS
                hdfs://mycluster
                

                
                        hadoop.tmp.dir
                        /opt/module/hadoop-3.1.3/data
                

                
	                  ha.zookeeper.quorum
	                  master:2181,slave1:2181,slave2:2181
                

hdfs-site.xml配置如下

        
                dfs.nameservices
                mycluster
        

        
                dfs.ha.namenodes.mycluster
                nn1,nn2
        

        
                dfs.namenode.rpc-address.mycluster.nn1
                master:9000
        

        
                dfs.namenode.rpc-address.mycluster.nn2
                slave1:9000
        

        
                dfs.namenode.http-address.mycluster.nn1
                master:9870
        

        
                dfs.namenode.http-address.mycluster.nn2
                slave1:9870
        

        
                dfs.namenode.shared.edits.dir
        qjournal://master:8485;slave1:8485;slave2:8485/mycluster
        

        
                dfs.ha.fencing.methods
                sshfence
        

        
                dfs.ha.fencing.ssh.private-key-files
                /root/.ssh/id_rsa
        

        
                dfs.journalnode.edits.dir
                /opt/module/hadoop-3.1.3/data/jn
        

        
                dfs.permissions.enable
                false
        

        
                dfs.client.failover.proxy.provider.mycluster
        org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider


                
                        hadoop.tmp.dir
                        /opt/module/hadoop-3.1.3/data
                
                
                       dfs.namenode.name.dir
                       /opt/module/hadoop-3.1.3/data/namenode
                
                
                      dfs.datanode.data.dir
                      /opt/module/hadoop-3.1.3/data/datanode
                
		
	               dfs.ha.automatic-failover.enabled
	               true
                        

yarn-site.xml配置如下

 
 
 yarn.nodemanager.aux-services
 mapreduce_shuffle
 
 
 
 yarn.resourcemanager.hostname
 slave1
 
 
            yarn.resourcemanager.webapp.address
            slave1:8088
 
 
 
 yarn.nodemanager.env-whitelist
JAVA_HOME,HADOOP_COMMON_HOME,HADOOP_HDFS_HOME,HADOOP_CO
NF_DIR,CLASSPATH_PREPEND_DISTCACHE,HADOOP_YARN_HOME,HADOOP_MAP
RED_HOME
 

mapred-site.xml配置如下

 
 mapreduce.framework.name
 yarn
 


 mapreduce.jobhistory.address
 slave1:10020



 mapreduce.jobhistory.webapp.address
 slave1:19888

 
     	mapreduce.application.classpath
  $HADOOP_MAPRED_HOME/share/hadoop/mapreduce/*:$HADOOP_MAPRED_HOME/share/hadoop/mapreduce/lib/*
   

接下来，修改workers文件，因为我们三台主机都作为datanode，所以三个主机名都加上

[root@master hadoop]# vim workers

master #每行末尾不允许有空格
slave1
slave2

hadoop3.x新特性需要更改hadoop-env.sh yarn-env.sh

hadoop-env.sh添加如下内容

export JAVA_HOME=/opt/module/jdk1.8.0_301
export HDFS_NAMENODE_USER=root
export HDFS_DATANODE_USER=root
export HDFS_SECONDARYNAMENODE_USER=root
export HDFS_ZKFC_USER=root
export HDFS_JOURNALNODE_USER=root

yarn-site.xml添加如下内容

export YARN_RESOURCEMANAGER_USER=root
export HADOOP_SECURE_DN_USER=yarn
export YARN_NODEMANAGER_USER=root

接下来配置zookeeper，先把module目录分发一下

[root@master hadoop]# xsync /opt/module/

配置zookeeper，在/opt/module/zookeeper-3.4.6/目录下创建zkData

[root@master zookeeper-3.4.6]# mkdir -p zkData

进入当前目录的conf目录下，并把zoo_sample.cfg改为zoo.cfg

[root@master conf]# mv zoo_sample.cfg zoo.cfg

配置zoo.cfg文件

dataDir=/opt/module/zookeeper-3.4.6/zkData

末尾添加以下内容

#######################cluster##########################
server.1=master:2888:3888
server.2=slave1:2888:3888
server.3=slave2:2888:3888

在zkData目录下创建myid文件，输入主机名所对应的server号，即在master主机上时设置为1

[root@master zkData]# vim myid
1

分发刚刚修改的配置

[root@master zkData]# xsync /opt/module/zookeeper-3.4.6/

记得修改其他主机的myid文件，分别对应 2 3

启动zookeeper集群，记得在其他两个主机source一下配置文件

[root@master zkData]# zkServer.sh start
JMX enabled by default
Using config: /opt/module/zookeeper-3.4.6/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED

[root@slave1 zkData]# zkServer.sh start
JMX enabled by default
Using config: /opt/module/zookeeper-3.4.6/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED

[root@slave2 zkData]# zkServer.sh start
JMX enabled by default
Using config: /opt/module/zookeeper-3.4.6/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED

查看状态

[root@master zkData]# zkServer.sh status
JMX enabled by default
Using config: /opt/module/zookeeper-3.4.6/bin/../conf/zoo.cfg
Mode: follower

[root@slave1 zkData]# zkServer.sh status
JMX enabled by default
Using config: /opt/module/zookeeper-3.4.6/bin/../conf/zoo.cfg
Mode: leader

[root@slave2 zkData]# zkServer.sh status
JMX enabled by default
Using config: /opt/module/zookeeper-3.4.6/bin/../conf/zoo.cfg
Mode: follower

高可用集群启动顺序

1.启动zookeeper

[root@master zkData]# zkServer.sh start
[root@slave1 zkData]# zkServer.sh start
[root@slave2 zkData]# zkServer.sh start

2.启动journalnode

[root@master zkData]# hdfs --daemon start journalnode
WARNING: /opt/module/hadoop-3.1.3/logs does not exist. Creating.

[root@slave1 zkData]# hdfs --daemon start journalnode
WARNING: /opt/module/hadoop-3.1.3/logs does not exist. Creating.

[root@slave2 zkData]# hdfs --daemon start journalnode
WARNING: /opt/module/hadoop-3.1.3/logs does not exist. Creating.

3.在其中一个Namenode主机上格式化zkfc

[root@master zkData]# hdfs zkfc -formatZK

4.格式化master主机Namenode，并启动

[root@master zkData]# hdfs namenode -format
[root@master zkData]# hdfs --daemon start namenode

5.在slave1上同步master的元数据信息，并启动namenode

[root@slave1 zkData]# hdfs namenode -bootstrapStandby
[root@slave1 zkData]#  hdfs --daemon start namenode

6.启动集群 

[root@master zkData]# start-all.sh
[root@slave1 .ssh]# start-yarn.sh

完成效果

 还可以在浏览器上输入  192.168.83.128(主机IP):9870

当你看到这两个页面，恭喜你，HDFS HA 搭建成功了,刚兴趣的朋友可以跳转至我的下一篇文章YARN-HAhttps://blog.csdn.net/qq_57193542/article/details/120555168https://blog.csdn.net/qq_57193542/article/details/120555168