非root用户 .ssh被删除，无法免密登录

1.问题

ssh loaclhost时报错

The authenticity of host 'localhost (::1)' can't be established.
RSA key fingerprint is 27:f6:11:78:c2:1d:93:8f:56:04:fb:b1:d9:d4:7e:e7.
Are you sure you want to continue connecting (yes/no)? yes
Failed to add the host to the list of known hosts (/home/hadoop/.ssh/known_hosts).

2.解决

原因是之前把home/hadoop删除，参照https://blog.csdn.net/keda8997110/article/details/8333080解决

sudo cp -R /root/.ssh/ /home/hadoop/
sudo chown hadoop:hadoop /home/hadoop/.ssh
sudo chown hadoop:hadoop /home/hadoop/.ssh/*
chmod 700 /home/hadoop/.ssh
chmod 600 /home/hadoop/.ssh/*