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Disable Host Key Checking

How to suppress typing “yes” when prompted by ssh.

#!/bin/bash
ssh-keygen -f "/home/user/.ssh/known_hosts" -R "yourdomain.com" 
ssh -o "StrictHostKeyChecking=no" -i "keys/key.pem" ubuntu@domain.com

  1. First remove old keys in the know_hosts file.
  2. Use “StrictHostKeyChecking” to suppress prompt.

SSH Access AllowGroups

If unable to login via SSH, check the /etc/ssh/sshd_config for AllowGroups.

AllowGroups root groupname

It’s case sensitive.

Remove Key from known_hosts

If you’ve changed keys, you will need to delete a ssh key from /etc/known_hosts file.

You can edit it manually using an editor such as vi or vim.

vim ~/.ssh/known_hosts

Or you can use ssh-keygen command with -R option to delete the hostname or IP address.

ssh-keygen -f "~/.ssh/known_hosts" -R "xxx.xxx.xxx.xxx"