Hadoop服务启动出现Permission denied (publickey,password)

办法：需要设置免密连接登录

首先运行

ssh localhost

如果还要输入密码的话，那就是你ssh没有配置好。这里要说一下的是ssh7.0之后就关闭了dsa的密码验证方式，如果你的秘钥是通过dsa生成的话，需要改用rsa来生成秘钥

ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

再次运行

ssh localhost

如果不需要输入密码，说明ssh配置好了。接下来可以运行start-all.sh文件了

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