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Common Errors

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Docker

• ERROR: Couldn't connect to Docker daemon at http+docker://localunixsocket - is it running?

  Add your current user to docker group then activates new permissions for docker group

  sudo usermod -a -G docker $USER
  newgrp docker
  

Virtual machine

• can't do ssh or scp to CentOS remote vm

  Change PasswordAuthentication in /etc/ssh/sshd_config

  'PasswordAuthentication no'
  # to
  'PasswordAuthentication yes'
  

  then restart the service sudo systemctl restart sshd