linux怎么查看本机内存大小
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2022-11-20
Hadoop之——hadoop2.2.0集群搭建
1.修改Linux主机名
2.修改IP
3.修改主机名和IP的映射关系
######注意######如果你们公司是租用的服务器或是使用的云主机(如华为云主机、阿里云主机等)
/etc/hosts里面要配置的是内网IP地址和主机名的映射关系
4.关闭防火墙
5.ssh免登陆
6.安装JDK,配置环境变量等
集群规划:
主机名 IP 安装的软件 运行的进程
liuyazhuang01 192.168.1.201 jdk、hadoop NameNode、DFSZKFailoverController
liuyazhuang02 192.168.1.202 jdk、hadoop NameNode、DFSZKFailoverController
liuyazhuang03 192.168.1.203 jdk、hadoop ResourceManager
liuyazhuang04 192.168.1.204 jdk、hadoop、zookeeper DataNode、NodeManager、JournalNode、QuorumPeerMain
liuyazhuang05 192.168.1.205 jdk、hadoop、zookeeper DataNode、NodeManager、JournalNode、QuorumPeerMain
liuyazhuang06 192.168.1.206 jdk、hadoop、zookeeper DataNode、NodeManager、JournalNode、QuorumPeerMain
说明:
在hadoop2.0中通常由两个NameNode组成,一个处于active状态,另一个处于standby状态。Active NameNode对外提供服务,而Standby NameNode则不对外提供服务,仅同步active namenode的状态,以便能够在它失败时快速进行切换。
hadoop2.0官方提供了两种HDFS HA的解决方案,一种是NFS,另一种是QJM。这里我们使用简单的QJM。在该方案中,主备NameNode之间通过一组JournalNode同步元数据信息,一条数据只要成功写入多数JournalNode即认为写入成功。通常配置奇数个JournalNode
这里还配置了一个zookeeper集群,用于ZKFC(DFSZKFailoverController)故障转移,当Active NameNode挂掉了,会自动切换Standby NameNode为standby状态
安装步骤:
1.安装配置zooekeeper集群
1.1解压
tar -zxvf zookeeper-3.4.5.tar.gz -C /liuyazhuang/
1.2修改配置
cd /liuyazhuang/zookeeper-3.4.5/conf/cp zoo_sample.cfg zoo.cfgvim zoo.cfg修改:dataDir=/liuyazhuang/zookeeper-3.4.5/tmp在最后添加:server.1=liuyazhuang04:2888:3888server.2=liuyazhuang05:2888:3888server.3=liuyazhuang06:2888:3888保存退出然后创建一个tmp文件夹mkdir /liuyazhuang/zookeeper-3.4.5/tmp再创建一个空文件touch /liuyazhuang/zookeeper-3.4.5/tmp/myid最后向该文件写入IDecho 1 > /liuyazhuang/zookeeper-3.4.5/tmp/myid
1.3拷贝配置好的zookeeper
将配置好的zookeeper拷贝到其他节点(首先分别在liuyazhuang05、liuyazhuang06根目录下创建一个liuyazhuang目录:mkdir /liuyazhuang)
scp -r /liuyazhuang/zookeeper-3.4.5/ liuyazhuang05:/liuyazhuang/scp -r /liuyazhuang/zookeeper-3.4.5/ liuyazhuang06:/liuyazhuang/注意:修改liuyazhuang05、liuyazhuang06对应/liuyazhuang/zookeeper-3.4.5/tmp/myid内容liuyazhuang05: echo 2 > /liuyazhuang/zookeeper-3.4.5/tmp/myidliuyazhuang06: echo 3 > /liuyazhuang/zookeeper-3.4.5/tmp/myid
2.安装配置hadoop集群
2.1解压
tar -zxvf hadoop-2.2.0.tar.gz -C /liuyazhuang/
2.2配置HDFS(hadoop2.0所有的配置文件都在$HADOOP_HOME/etc/hadoop目录下)
#将hadoop添加到环境变量中vim /etc/profileexport JAVA_HOME=/usr/java/jdk1.7.0_55export HADOOP_HOME=/liuyazhuang/hadoop-2.2.0export PATH=$PATH:$JAVA_HOME/bin:$HADOOP_HOME/bin#hadoop2.0的配置文件全部在$HADOOP_HOME/etc/hadoop下cd /liuyazhuang/hadoop-2.2.0/etc/hadoop
2.2.1修改hadoo-env.sh
export JAVA_HOME=/usr/java/jdk1.7.0_55
2.2.2修改core-site.xml
2.2.3修改hdfs-site.xml
2.2.4修改mapred-site.xml
2.2.5修改yarn-site.xml
2.2.6修改slaves
修改slaves(slaves是指定子节点的位置,因为要在liuyazhuang01上启动HDFS、在liuyazhuang03启动yarn,所以liuyazhuang01上的slaves文件指定的是datanode的位置,liuyazhuang03上的slaves文件指定的是nodemanager的位置)
liuyazhuang04liuyazhuang05liuyazhuang06
2.2.7配置免密码登陆
#首先要配置liuyazhuang01到liuyazhuang02、liuyazhuang03、liuyazhuang04、liuyazhuang05、liuyazhuang06的免密码登陆#在liuyazhuang01上生产一对钥匙ssh-keygen -t rsa#将公钥拷贝到其他节点,包括自己ssh-coyp-id liuyazhuang01ssh-coyp-id liuyazhuang02ssh-coyp-id liuyazhuang03ssh-coyp-id liuyazhuang04ssh-coyp-id liuyazhuang05ssh-coyp-id liuyazhuang06#配置liuyazhuang03到liuyazhuang04、liuyazhuang05、liuyazhuang06的免密码登陆#在liuyazhuang03上生产一对钥匙ssh-keygen -t rsa#将公钥拷贝到其他节点ssh-coyp-id liuyazhuang04ssh-coyp-id liuyazhuang05ssh-coyp-id liuyazhuang06#注意:两个namenode之间要配置ssh免密码登陆,别忘了配置liuyazhuang02到liuyazhuang01的免登陆在liuyazhuang02上生产一对钥匙ssh-keygen -t rsassh-coyp-id -i liuyazhuang01
2.4将配置好的hadoop拷贝到其他节点
scp -r /liuyazhuang/ liuyazhuang02:/scp -r /liuyazhuang/ liuyazhuang03:/scp -r /liuyazhuang/hadoop-2.2.0/ root@liuyazhuang04:/liuyazhuang/scp -r /liuyazhuang/hadoop-2.2.0/ root@liuyazhuang05:/liuyazhuang/scp -r /liuyazhuang/hadoop-2.2.0/ root@liuyazhuang06:/liuyazhuang/
###注意:严格按照下面的步骤
2.5启动zookeeper集群
(分别在liuyazhuang04、liuyazhuang05、liuyazhuang06上启动zk)
cd /liuyazhuang/zookeeper-3.4.5/bin/./zkServer.sh start#查看状态:一个leader,两个follower./zkServer.sh status
2.6启动journalnode
(在liuyazhuang01上启动所有journalnode,注意:是调用的hadoop-daemons.sh这个脚本,注意是复数s的那个脚本)
cd /liuyazhuang/hadoop-2.2.0sbin/hadoop-daemons.sh start journalnode
#运行jps命令检验,liuyazhuang04、liuyazhuang05、liuyazhuang06上多了JournalNode进程
2.7格式化HDFS
#在liuyazhuang01上执行命令:hdfs namenode -format#格式化后会在根据core-site.xml中的hadoop.tmp.dir配置生成个文件,这里我配置的是/liuyazhuang/hadoop-2.2.0/tmp,然后将/liuyazhuang/hadoop-2.2.0/tmp拷贝到liuyazhuang02的/liuyazhuang/hadoop-2.2.0/下。scp -r tmp/ liuyazhuang02:/liuyazhuang/hadoop-2.2.0/
2.8格式化ZK(在liuyazhuang01上执行即可)
hdfs zkfc -formatZK
2.9启动HDFS(在liuyazhuang01上执行)
sbin/start-dfs.sh
2.10启动YARN
(#####注意#####:是在liuyazhuang03上执行start-yarn.sh,把namenode和resourcemanager分开是因为性能问题,因为他们都要占用大量资源,所以把他们分开了,他们分开了就要分别在不同的机器上启动)
sbin/start-yarn.sh
到此,hadoop2.2.0配置完毕,可以统计浏览器访问:
'liuyazhuang01:9000' (active)'liuyazhuang02:9000' (standby)
验证HDFS HA
首先向hdfs上传一个文件hadoop fs -put /etc/profile /profilehadoop fs -ls /然后再kill掉active的NameNodekill -9
验证YARN:
运行一下hadoop提供的demo中的WordCount程序:
hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.2.0.jar wordcount /profile /out
OK,大功告成!!!
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