为什么在启动任何服务之前，hadoop要求输入密码？ [英] why hadoop asks for password before starting any of the services?

问题描述

为什么在启动hadoop之前需要ssh登录？为什么hadoop要求密码启动任何服务？

  shravilp @ shravilp -HP-15-Notebook-PC：〜/ hadoop-2.6.3 $ sbin / start-all。 sh 
此脚本已弃用。而是使用start-dfs.sh和start-yarn.sh 
在[localhost]上启动namenodes 
 shravilp @ localhost的密码：
 localhost：启动namenode，记录到/ home / shravilp / hadoop- 
  

解决方案

在Ubuntu中，您可以使用以下一次设置在运行hadoop命令时不需要输入密码，例如start-dfs.sh，start-yarn.sh：

  sudo apt-get install openssh-server openssh-client 
 ssh-keygen -t rsa 
 ssh-copy-id user @ localhost 
  

用您的用户名替换用户。它在Ubuntu 16.04.2，hadoop-2.7.3，jdk1.8.0_121上进行了测试。

注意：1.执行ssh- keygen -t rsa命令，只需按三次ENTER键即可接受默认值。 2.执行ssh-copy-id user @ localhost命令时，你确定要继续连接（是/否）吗？输入yes，然后输入你的密码

看到这个问题还

why ssh login is required before starting hadoop? And why hadoop asks for password for starting any of the services?

shravilp@shravilp-HP-15-Notebook-PC:~/hadoop-2.6.3$ sbin/start-all.sh
This script is Deprecated. Instead use start-dfs.sh and start-yarn.sh
Starting namenodes on [localhost] 
shravilp@localhost's password: 
localhost: starting namenode, logging to /home/shravilp/hadoop-              

解决方案

In Ubuntu, you can use the following one time set up steps to eliminate the need to enter password when running hadoop commands, for example, start-dfs.sh, start-yarn.sh:

sudo apt-get install openssh-server openssh-client
ssh-keygen -t rsa
ssh-copy-id user@localhost

replace user with your username. It was tested on Ubuntu 16.04.2, hadoop-2.7.3, jdk1.8.0_121

Note: 1. when execute "ssh-keygen -t rsa" command, you can simply press ENTER three times to accept the default values. 2. when execute "ssh-copy-id user@localhost" command, "Are you sure you want to continue connecting (yes/no)?" enter "yes", then your password

See this question also

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