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作為一個以后肯定要做大數據的人，至今還沒玩過Java 和 Hadoop 會不會被老師打死？所以就想著，在我的國外的云主機上搭建個Hadoop ，以后在 dell 電腦的ubuntu系統下也搭建一個，然后還有一臺老戴爾可以搭一個，mac也可以搭一個，勉強算是一個分布式集群了？不管了。反正今天先把Hadoop在Ubuntu 17.04 下搭建好吧！

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國內的資料都太老了。我就用Google搜了一波，果然好用啊！！

之后選擇了一個教程： www.admintome.com/blog/instal… 下面進入安裝環節：

1、 Install required software

# apt update && apt upgrade -y # reboot# apt install -y openjdk-8-jdk# apt install ssh pdsh -y 復制代碼

2、 Download Hadoop

# wget http://apache.cs.utah.edu/hadoop/common/stable/hadoop-2.8.2.tar.gz # tar -xzvf hadoop-2.8.2.tar.gz # cd hadoop-2.8.2/ 復制代碼

上面的網址現在好像廢了。我找了一些新的，你們自己看條件選擇：

apache.claz.org/hadoop/comm…

apache.claz.org/hadoop/comm…

下面是下載安裝和安裝完畢之后的樣子:

下面進入配置環節：

We need to make some additions to our configuration, so edit the next couple of files with the appropriate contents:

etc/hadoop/hadoop-env.sh

export JAVA_HOME=/usr 復制代碼

etc/hadoop/core-site.xml

<configuration><property><name>fs.defaultFS</name><value>hdfs://localhost:9000</value></property> </configuration>復制代碼

etc/hadoop/hdfs-site.xml

<configuration><property><name>dfs.replication</name><value>1</value></property> </configuration>復制代碼

Now in order to make the scripts work, we need to setup passwordless SSH to localhost:

$ ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa$ cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys$ chmod 0600 ~/.ssh/authorized_keys 復制代碼

Format the HDFS filesystem.

# bin/hdfs namenode -format 復制代碼

And finally, start up HDFS.

# sbin/start-dfs.sh 復制代碼

After it starts up you can access the web interface for the NameNode at this URL: http://{server-ip}50070 .

因為我的是云主機，所以直接用類似網站的方式也可以進入：

Configure YARN

Create the directories we will need for YARN.

# bin/hdfs dfs -mkdir /user # bin/hdfs dfs -mkdir /user/root 復制代碼

Edit etc/hadoop/mapred-site.xml and add the following contents:

<configuration><property><name>mapreduce.framework.name</name><value>yarn</value></property> </configuration> 復制代碼

And edit

etc/hadoop/yarn-site.xml:

<property><name>yarn.nodemanager.aux-services</name><value>mapreduce_shuffle</value></property><property><name>yarn.nodemanager.vmem-check-enabled</name><value>false</value></property> 復制代碼

Start YARN:

# sbin/start-yarn.sh 復制代碼

如果無法啟動，報錯如下：

root@HustWolfzzb:/home/hustwolf/Hadoop/hadoop-2.8.2# sbin/start-yarn.sh starting yarn daemons resourcemanager running as process 16803. Stop it first. localhost: starting nodemanager, logging to /home/hustwolf/Hadoop/hadoop-2.8.2/logs/yarn-root-nodemanager-HustWolfzzb.out root@HustWolfzzb:/home/hustwolf/Hadoop/hadoop-2.8.2# kill -9 16803 root@HustWolfzzb:/home/hustwolf/Hadoop/hadoop-2.8.2# sbin/start-yarn.sh starting yarn daemons starting resourcemanager, logging to /home/hustwolf/Hadoop/hadoop-2.8.2/logs/yarn-root-resourcemanager-HustWolfzzb.out localhost: nodemanager running as process 17374. Stop it first. root@HustWolfzzb:/home/hustwolf/Hadoop/hadoop-2.8.2# ls 復制代碼

那么，先把所有的先關了。方法是到sbin下采用stop腳本，可以直接stop-all.sh 也可以試試stop-dfs.sh stop-yarn.sh 兩個搭配。然后再開啟一次就ok.

You can now view the web interface at

http://{server-ip}:8088 .

Testing our installation

In order to test that everything is working we can run a MapReduce job using YARN:

# bin/yarn jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.8.2.jar pi 16 1000 復制代碼

This is going to calculate PI to 16 decimal places for us using the quasiMonteCarlo method. After a minute or two you should get your response:

Job Finished in 96.095 seconds Estimated value of Pi is 3.14250000000000000000 復制代碼

我在這兒遇到了一個很苦惱的問題就是:

Number of Maps = 16 Samples per Map = 1000 17/11/24 07:49:52 WARN ipc.Client: Failed to connect to server: localhost/127.0.0.1:9000: try once and fail. java.net.ConnectException: Connection refusedat sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:531)at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:495)at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:682)at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:778)at org.apache.hadoop.ipc.Client$Connection.access$3500(Client.java:410)at org.apache.hadoop.ipc.Client.getConnection(Client.java:1544)at org.apache.hadoop.ipc.Client.call(Client.java:1375)at org.apache.hadoop.ipc.Client.call(Client.java:1339)at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:227)at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:116)at com.sun.proxy.$Proxy10.getFileInfo(Unknown Source)at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileInfo(ClientNamenodeProtocolTranslatorPB.java:792)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:409)at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeMethod(RetryInvocationHandler.java:163)at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invoke(RetryInvocationHandler.java:155)at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeOnce(RetryInvocationHandler.java:95)at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:346)at com.sun.proxy.$Proxy11.getFileInfo(Unknown Source)at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:1704)at org.apache.hadoop.hdfs.DistributedFileSystem$27.doCall(DistributedFileSystem.java:1436)at org.apache.hadoop.hdfs.DistributedFileSystem$27.doCall(DistributedFileSystem.java:1433)at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1433)at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:1437)at org.apache.hadoop.examples.QuasiMonteCarlo.estimatePi(QuasiMonteCarlo.java:278)at org.apache.hadoop.examples.QuasiMonteCarlo.run(QuasiMonteCarlo.java:358)at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)at org.apache.hadoop.examples.QuasiMonteCarlo.main(QuasiMonteCarlo.java:367)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:71)at org.apache.hadoop.util.ProgramDriver.run(ProgramDriver.java:144)at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:74)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.apache.hadoop.util.RunJar.run(RunJar.java:234)at org.apache.hadoop.util.RunJar.main(RunJar.java:148) java.net.ConnectException: Call From HustWolfzzb/127.0.1.1 to localhost:9000 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefusedat sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:801)at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:732)at org.apache.hadoop.ipc.Client.getRpcResponse(Client.java:1487)at org.apache.hadoop.ipc.Client.call(Client.java:1429)at org.apache.hadoop.ipc.Client.call(Client.java:1339)at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:227)at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:116)at com.sun.proxy.$Proxy10.getFileInfo(Unknown Source)at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileInfo(ClientNamenodeProtocolTranslatorPB.java:792)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:409)at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeMethod(RetryInvocationHandler.java:163)at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invoke(RetryInvocationHandler.java:155)at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeOnce(RetryInvocationHandler.java:95)at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:346)at com.sun.proxy.$Proxy11.getFileInfo(Unknown Source)at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:1704)at org.apache.hadoop.hdfs.DistributedFileSystem$27.doCall(DistributedFileSystem.java:1436)at org.apache.hadoop.hdfs.DistributedFileSystem$27.doCall(DistributedFileSystem.java:1433)at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1433)at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:1437)at org.apache.hadoop.examples.QuasiMonteCarlo.estimatePi(QuasiMonteCarlo.java:278)at org.apache.hadoop.examples.QuasiMonteCarlo.run(QuasiMonteCarlo.java:358)at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)at org.apache.hadoop.examples.QuasiMonteCarlo.main(QuasiMonteCarlo.java:367)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:71)at org.apache.hadoop.util.ProgramDriver.run(ProgramDriver.java:144)at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:74)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.apache.hadoop.util.RunJar.run(RunJar.java:234)at org.apache.hadoop.util.RunJar.main(RunJar.java:148) Caused by: java.net.ConnectException: Connection refusedat sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:531)at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:495)at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:682)at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:778)at org.apache.hadoop.ipc.Client$Connection.access$3500(Client.java:410)at org.apache.hadoop.ipc.Client.getConnection(Client.java:1544)at org.apache.hadoop.ipc.Client.call(Client.java:1375)... 38 more 復制代碼

至今還沒解決，不過文章實在沒啥好改的了。后續如果有了解決之道，我就在評論區貼出來，或者直接修改文章吧！拜了個拜~ 健身去~~！！

This should be enough to get you started on your Hadoop journey. Subscribe to my newsletter below to get notifications of more Hadoop articles.

I hope you enjoyed this post. If it was helpful or if it was way off then please comment and let me know.

好像成功了？？？我好像是漏了建立hdfs用戶的那一關？然后還有就是重啟了一次，以及對于一些東西的缺漏。 不過就在我期待值最高的時候，事實給了我狠狠的一擊。好吧，GG。不過還是發現了不少了的有用的教程！！

Hadoop環境安裝設置 hadoop 2.7.1安裝和配置

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人家老外英文寫的挺好的，我就不多改了。想必就算看不大懂也可以摸索著在百度翻譯的幫助下get 到點，實在不行可以發評論問我嘛 而且，命令都給你整好了，難道還不會？不存在的！！

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