CentOS7.0安装配置hadoop2.7.4资源准备 资源下载: 注意事项: - 注意hadoop,jdk,centos都应该是64位或者32位的,以免出现无法预料的错误建议使用64位的
linux 虚拟机配置系统配置: - 虚拟机:一个master(Master.Hadoop),两个slave(Slave1.Hadoop, Slave2.Hadoop)
- 网络设置:我NAT的方式
- 内存:每个虚拟机配置1024M内存
- 分区:自动
- 软件选择:最小安装,注意选择开发工具
- 进行以下步骤前,确保3台虚拟机与主机之间可以相互ping通
yum search ifconfg
yum install net-tools.x86_64
完成其它两个虚拟机的安装: - 两个slave的hostname可以改成Slave1.Hadoop, Slave2.Hadoop,方便区分
安装完后各个虚拟机的ip配置(参考用) 主机ip地址
master.hadoop192.168.202.128
slave1.hadoop192.168.202.129
slave2.hadoop192.168.202.130配置本地hosts 、、需把下图红框内容删除,否则启动有问题。
vi /etc/hosts
// 将以下数据复制进入各个主机中
192.168.202.128 master.hadoop
192.168.202.129 slave1.hadoop
192.168.202.130 slave2.hadoop
- 使用以下指令对master主机中进行测试,可使用类似指令在slave主机测试
ping slave1.hadoop
ping slave2.hadoop
配置Master无密码登录所有Salve以下在Master主机上配置 - 输入以下指令生成ssh,过程中遇到需要输入密码,只需执行回车Enter即可
ssh-keygen
// 会生成两个文件,放到默认的/root/.ssh/文件夹中
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keyschmod 600 ~/.ssh/authorized_keys
vi /etc/ssh/sshd_config
// 以下三项修改成以下配置
RSAAuthentication yes # 启用 RSA 认证
PubkeyAuthentication yes # 启用公钥私钥配对认证方式
AuthorizedKeysFile .ssh/authorized_keys # 公钥文件路径(和上面生成的文件同)
service sshd restart
// scp ~/.ssh/id_rsa.pub 远程用户名@远程服务器IP:~/
scp ~/.ssh/id_rsa.pub root@192.168.202.129:~/
scp ~/.ssh/id_rsa.pub root@192.168.202.130:~/
以下在Slave主机上配置
mkdir ~/.ssh
// 修改权限
chmod 700 ~/.ssh
cat ~/id_rsa.pub >> ~/.ssh/authorized_keys
// 修改权限
chmod 600 ~/.ssh/authorized_keys
rm –r ~/id_rsa.pub在master主机下进行测试
ssh 192.168.202.129
ssh 192.168.202.130
// 如果能够分别无密码登陆slave1, slave2主机,则成功配置
jdk安装: - 在/usr下创建java文件夹
- 使用第三方软件将jdk压缩包文件传到3台虚拟主机中
tar zxvf jdk-8u45-linux-x64.tar.gz
// 解压后可以删除掉gz文件
rm jdk-8u45-linux-x64.tar.gz
vi /etc/profile
// 将以下数据复制到文件底部
export JAVA_HOME=/usr/java/jdk1.8.0_45
export JRE_HOME=/usr/java/jdk1.8.0_45/jre
export CLASSPATH=.:$CLASSPATH:$JAVA_HOME/lib:$JRE_HOME/lib
export PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
source /etc/profile
java -version
// 如果出现以下信息,则配置成功
java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)
- 解压hadoop-2.7.4.tar.gz文件,并重命名
cd /usr
tar zxvf hadoop-2.7.4.tar.gz
mv hadoop-2.7.4 hadoop
// 删除hadoop-2.7.4.tar.gz文件
rm –rf hadoop-2.7.4.tar.gz
- 把Hadoop的安装路径添加到”/etc/profile”中
vi /etc/profile
// 将以下数据加入到文件末尾
export HADOOP_INSTALL=/usr/hadoop
export PATH=${HADOOP_INSTALL}/bin:${HADOOP_INSTALL}/sbin:${PATH}
export HADOOP_MAPRED_HOME=${HADOOP_INSTALL}
export HADOOP_COMMON_HOME=${HADOOP_INSTALL}
export HADOOP_HDFS_HOME=${HADOOP_INSTALL}
export YARN_HOME=${HADOOP_INSTALLL}
export HADOOP_COMMON_LIB_NATIVE_DIR=${HADOOP_INSTALL}/lib/natvie
export HADOOP_OPTS="-Djava.library.path=${HADOOP_INSTALL}/lib:${HADOOP_INSTALL}/lib/native"
source /etc/profile- 置hadoop(先只在Master主机配置,配置完后传入两个Slave主机)
- 设置hadoop-env.sh和yarn-env.sh中的java环境变量
cd /usr/hadoop/etc/hadoop/
vi hadoop-env.sh
// 修改JAVA_HOME
export JAVA_HOME=/usr/java/jdk1.8.0_45
vi core-site.xml
// 修改文件内容为以下
<configuration>
<property>
<name>hadoop.tmp.dir</name>
<value>/usr/hadoop/tmp</value>
<description>A base for other temporary directories.</description>
</property>
<property>
<name>fs.default.name</name>
<value>hdfs://master.hadoop:9000</value>
</property>
</configuration>
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- 配置mapred-site.xml文件,如没有此文件需要手动创建,文件头尾加上configuration标签,把下面内容复制到中间即可
vi mapred-site.xml
// 修改文件为以下
<property>
<name>mapreduce.framework.name</name>
<value>yarn</value>
<final>true</final>
</property>
<property>
<name>mapreduce.jobtracker.http.address</name>
<value>master.hadoop:50030</value>
</property>
<property>
<name>mapreduce.jobhistory.address</name>
<value>master.hadoop:10020</value>
</property>
<property>
<name>mapreduce.jobhistory.webapp.address</name>
<value>master.hadoop:19888</value>
</property>
<property>
<name>mapred.job.tracker</name>
<value>http://master.hadoop:9001</value>
</property>
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vi yarn-site.xml
// 修改文件内容为以下
<property>
<name>yarn.resourcemanager.hostname</name>
<value>master.hadoop</value>
</property>
<property>
<name>yarn.nodemanager.aux-services</name>
<value>mapreduce_shuffle</value>
</property>
<property>
<name>yarn.resourcemanager.address</name>
<value>master.hadoop:8032</value>
</property>
<property>
<name>yarn.resourcemanager.scheduler.address</name>
<value>master.hadoop:8030</value>
</property>
<property>
<name>yarn.resourcemanager.resource-tracker.address</name>
<value>master.hadoop:8031</value>
</property>
<property>
<name>yarn.resourcemanager.admin.address</name>
<value>master.hadoop:8033</value>
</property>
<property>
<name>yarn.resourcemanager.webapp.address</name>
<value>master.hadoop:8088</value>
</property>
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配置Hadoop的集群- 将Master中配置好的hadoop传入两个Slave中
scp -r /usr/hadoop root@192.168.202.129:/usr/
scp -r /usr/hadoop root@192.168.202.130:/usr/
cd /usr/hadoop/etc/hadoop
vi slaves
// 将文件内容修改为
slave1.hadoop
slave2.hadoop
- 格式化HDFS文件系统
- 注意:只需初始化一次便可。若执行多次,可能会导致namenode与datanode的clusterID不一致,从而导致无法启动
// 在Master主机上输入以下指令
hadoop namenode -format
// 关闭机器防火墙 根据自己的版本不同,命令有所不同
CentOS 7
关闭firewall:
systemctl stop/start firewalld.service 停止/启动firewall
systemctl disable firewalld.service 禁止firewall开机启动
firewall-cmd --state 查看默认防火墙状态
cd /usr/hadoop/sbin
./start-all.sh
// 更推荐的运行方式:
cd /usr/hadoop/sbin
./start-dfs.sh
./start-yarn.sh
应该输出以下信息:
Starting namenodes on [Master.Hadoop]
Master.Hadoop: starting namenode, logging to /usr/hadoop/logs/hadoop-root-namenode-localhost.localdomain.out
Slave2.Hadoop: starting datanode, logging to /usr/hadoop/logs/hadoop-root-datanode-Slave2.Hadoop.out
Slave1.Hadoop: starting datanode, logging to /usr/hadoop/logs/hadoop-root-datanode-Slave1.Hadoop.out
starting yarn daemons
starting resourcemanager, logging to /usr/hadoop/logs/yarn-root-resourcemanager-localhost.localdomain.out
Slave1.Hadoop: starting nodemanager, logging to /usr/hadoop/logs/yarn-root-nodemanager-Slave1.Hadoop.out
Slave2.Hadoop: starting nodemanager, logging to /usr/hadoop/logs/yarn-root-nodemanager-Slave2.Hadoop.out
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// 1. 直接在Master或Slave输入指令:
jps
// 应该输出以下信息(端口号仅供参考)
Master:
3930 ResourceManager
4506 Jps
3693 NameNode
Slave:
2792 NodeManager
2920 Jps
2701 DataNode
// 2. 输入以下指令
hadoop dfsadmin -report
// 应该输出以下信息:
Configured Capacity: 14382268416 (13.39 GB)
Present Capacity: 10538565632 (9.81 GB)
DFS Remaining: 10538557440 (9.81 GB)
DFS Used: 8192 (8 KB)
DFS Used%: 0.00%
Under replicated blocks: 0
Blocks with corrupt replicas: 0
Missing blocks: 0
Missing blocks (with replication factor 1): 0
-------------------------------------------------
Live datanodes (2):
Name: 192.168.1.124:50010 (Slave2.Hadoop)
Hostname: Slave2.Hadoop
Decommission Status : Normal
Configured Capacity: 7191134208 (6.70 GB)
DFS Used: 4096 (4 KB)
Non DFS Used: 1921933312 (1.79 GB)
DFS Remaining: 5269196800 (4.91 GB)
DFS Used%: 0.00%
DFS Remaining%: 73.27%
Configured Cache Capacity: 0 (0 B)
Cache Used: 0 (0 B)
Cache Remaining: 0 (0 B)
Cache Used%: 100.00%
Cache Remaining%: 0.00%
Xceivers: 1
Last contact: Thu Jul 02 10:45:04 CST 2015
Name: 192.168.1.125:50010 (Slave1.Hadoop)
Hostname: Slave1.Hadoop
Decommission Status : Normal
Configured Capacity: 7191134208 (6.70 GB)
DFS Used: 4096 (4 KB)
Non DFS Used: 1921769472 (1.79 GB)
DFS Remaining: 5269360640 (4.91 GB)
DFS Used%: 0.00%
DFS Remaining%: 73.28%
Configured Cache Capacity: 0 (0 B)
Cache Used: 0 (0 B)
Cache Remaining: 0 (0 B)
Cache Used%: 100.00%
Cache Remaining%: 0.00%
Xceivers: 1
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// CentOS7中iptables这个服务的配置文件没有了,采用了新的firewalld
// 输入以下指令后,可以在真机浏览器上访问hadoop网页
systemctl stop firewalld
// 输入以下网页,进入hadoop管理首页(IP地址为master 主机IP)
http://192.168.202.128:50070/dfshealth.html#tab-overview
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