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Enable SSH key login and disable password login

I created a centos vps and since i created that on phone, I enabled password login and did not specify any ssh key.

Now I am trying to update the config in /etc/ssh/sshd_config to disable password login and enable key based login but the config changes are not getting reflected. I am not able to login with public key.

I added a user with sudo permission. for that user, I added the key in .ssh/authorized_keys file. but ssh user@ip always asks for password.

Can someone please suggest on this what I am doing wrong or is sshd config not updatable once vps is created?

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To answer your question, once the VPS is created with password authentication only, if you want to manually allow key authentication, you may do so. We do not restrict this. As a suggestion I've included a helpful link and outlined some steps below:

I have successfully followed this guide to configure SSH key login:

The steps are:

 1. Generate public key on client machine 

ssh-keygen -t rsa

2. Copy public key from client (~/.ssh/ to server machine (~/.ssh/authorized_keys):

cat ~/.ssh/ | ssh root@Server_IP_Address "cat >> ~/.ssh/authorized_keys"

3. On server, edit /etc/ssh/sshd_config to enable key auth and disable password auth. Uncomment and modify below lines as shown:

PubkeyAuthentication yes
AuthorizedKeyFile  .ssh/authorized_keys
PasswordAuthentication no
ChallengeResponseAuthentication no

4.  Reload SSHD on server:

service sshd reload

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