SSH Key: “Permissions 0644 for 'id_rsa.pub' are too open.” on mac

Question

I generate a ssh key pair on my mac and add the public key to my ubuntu server(in fact, it is a virtual machine on my mac),but when I try to login the ubuntu server,it says:

Answer 1

Those who suggested chmod 400 id_rsa.pub did not sound right at all. It was quite possible that op used pub key instead of private key to ssh.

So it might be as simple as ssh -i /Users/tudouya/.ssh/vm/vm_id_rsa (the private key) user@host to fix it.

--- update ---

Check this article https://www.digitalocean.com/community/tutorials/how-to-set-up-ssh-keys--2 for how to set up ssh key