root@hadoop102's password: Permission denied, please try again.

出现 "root@hadoop102's password: Permission denied, please try again" 错误是因为root用户没有权限造成的。解决这个问题的方法是设置root用户的ssh无密码登录。首先，您需要确认是否已经安装了openssh-server，如果没有安装可以通过运行sudo apt-get install openssh-server来安装。然后，您可以按照以下步骤进行root用户的免验证登录设置:

1. 使用root用户运行ssh localhost命令来检查是否需要输入密码。如果需要输入密码，则说明没有开启ssh无密码登录。
2. 使用su命令进入root状态。
3. 运行ssh-keygen -t rsa命令生成密钥对。在生成过程中，按回车键接受默认设置。
4. 运行cat ./id_rsa.pub >> ./authorized_keys命令将公钥添加到authorized_keys文件中。

这样，您就设置了root用户的ssh无密码登录。现在您可以尝试执行start-all.sh命令并输入root密码，应该可以成功执行了。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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