UNPROTECTED PRIVATE KEY FILE

The full error message:

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: UNPROTECTED PRIVATE KEY FILE! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Permissions 0744 for '/home/geek/.ssh/id_rsa' are too open.
It is recommended that your private key files are NOT accessible by others.
This private key will be ignored.
bad permissions: ignore key: /home/geek/.ssh/id_rsa

>> To fix this, you'll need to reset the permissions back to default:

sudo chmod 600 ~/.ssh/id_rsa
sudo chmod 600 ~/.ssh/id_rsa.pub

If you are getting another error:

Are you sure you want to continue connecting (yes/no)? yes
Failed to add the host to the list of known hosts (/home/geek/.ssh/known_hosts).

This means that the permissions on that file are also set incorrectly, and can be adjusted with this:

sudo chmod 644 ~/.ssh/known_hosts

Finally, you may need to adjust the directory permissions as well:

sudo chmod 755 ~/.ssh

This should get you back up and running.

Retrieved from "http://www.howtogeek.com/wiki/Fixing_%22WARNING:_UNPROTECTED_PRIVATE_KEY_FILE%21%22_on_Linux"

原文地址:https://www.cnblogs.com/Amagasaki/p/3953985.html