Question 104086 in Azure Question posted in
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Change Azure VM authentication to ssh key

I have Linux VM on Azure which at first set without SSH keys. which means authentication is made only with password via SSH. I would like to change it now. I tried the way I know, I can login with the keys – but still login with password.

What else did I miss? There is something else?

Thanks

Tried to configure SSH key, disable the ‘passwordauthentication’

Change ssh config
Add key via azure portal

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2

Answers


  1. 0

    Try to following these steps –

    1. Login to your existing azure VM using passwords authentication.

    2. Create new ssh key pair.

      ssh-keygen -t rsa -b 2048

    3. Replace ~/.ssh/authorized_keys with ~/.ssh/id_rsa.pub key

      mv ~/.ssh/id_rsa.pub ~/.ssh/authorized_keys

    4. Save ~/.ssh/id_rsa public key to your local system.

    5. Edit /etc/ssh/sshd_config and make following changes

      Change PasswordAuthentication to this:

      PasswordAuthentication no

      Change PubkeyAuthentication to this:

      PubkeyAuthentication yes

      Change PermitRootLogin to this:

      PermitRootLogin no

      Change ChallengeResponseAuthentication to this:

      ChallengeResponseAuthentication no

    6. Restart the vm using following command

      sudo systemctl restart ssh

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  2. 0

    I tried to reproduce the same in my environment and got the results like below:

    I have created Linux VM on Azure first set without SSH keys only with password via SSH then I tried to authentication to ssh key like below:

    Create SSH key pair:

    ssh-keygen -t rsa -b 2048

    Then, use /home/<user>/.ssh/id_rsa.pub

    Enter passphrase: Give your password

    Once you enter password RSA will executed successfully like below:

    enter image description here

    Then try to move to id_rsa to authorized using below script:

    `mv/home/<user>/.ssh/id_rsa.pub/home/<user>/.ssh/authorized_keys`

    enter image description here

    when I run this cmd cat id_rsa I got public key successfully like below

    enter image description here

    I agree with schine som And save public key open config file with vi and try restart like below:

    PasswordAuthentication no

    enter image description here

    PubkeyAuthentication yes

    enter image description here
    PermitRootLogin no

    enter image description here

    ChallengeResponseAuthentication no

    enter image description here

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