Hadoop 免密钥登录问题

Question

配置都是成功的，但是ssh slave却运行不通

pzx用户名是HadoopMaster的

下面两张图片表示HadoopSlave和HadoopSlave1都已存放了HadoopMaster节点的公钥。

Answer 1

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• 这有个类似的问题, 你可以参考下: https://ask.csdn.net/questions/7572810
• 这篇博客你也可以参考下：启动Hadoop时一直提示输入密码的问题（SSH配置）
• 您还可以看一下 张伟洋老师的Hadoop大数据零基础入门课程课程中的 配置SSH无秘钥登录小节, 巩固相关知识点
  
• 除此之外, 这篇博客: hadoop访问ssh非默认端口问题中的 2.安装hadoop时，启动hadoop报错 部分也许能够解决你的问题, 你可以仔细阅读以下内容或跳转源博客中阅读:
  

  	[hadoop@ruozedata001 hadoop]$ sbin/start-dfs.sh 
  19/07/02 09:50:39 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java 	classes 		where applicable
  Starting namenodes on [localhost]
  localhost: ssh: connect to host localhost port 22: Connection refused
  localhost: ssh: connect to host localhost port 22: Connection refused
  Starting secondary namenodes [0.0.0.0]
  0.0.0.0: ssh: connect to host 0.0.0.0 port 22: Connection refused
  19/07/02 09:50:42 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java 			classes where applicable
  [hadoop@ruozedata001 hadoop]$ 
  解决方法
  [hadoop@ruozedata001 hadoop]$ echo “export HADOOP_SSH_OPTS="-p 2222"  >> ~/app/hadoop/etc/hadoop/hadoop-env.sh 
  

  然后再启动服务，服务就能正常启动了，如下

  	[hadoop@ruozedata001 hadoop]$ sbin/start-dfs.sh 
  19/07/02 10:04:20 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
  Starting namenodes on [localhost]
  localhost: starting namenode, logging to /home/hadoop/software/hadoop-2.6.0-cdh5.7.0/logs/hadoop-hadoop-namenode-	ruozedata001.out
  localhost: starting datanode, logging to /home/hadoop/software/hadoop-2.6.0-cdh5.7.0/logs/hadoop-hadoop-datanode-ruozedata001.out
  Starting secondary namenodes [0.0.0.0]
  0.0.0.0: starting secondarynamenode, logging to /home/hadoop/software/hadoop-2.6.0-cdh5.7.0/logs/hadoop-hadoop-		secondarynamenode-ruozedata001.out
  19/07/02 10:04:36 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
  [hadoop@ruozedata001 hadoop]$ jps
  3607 NameNode
  3911 SecondaryNameNode
  3709 DataNode
  4062 Jps
  [hadoop@ruozedata001 hadoop]$ 
  

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