cloud-init-config.yaml

#cloud-config
packages:
  - openssh-server
  - openssh-client

# Set root password
chpasswd:
  list: |
    root:root
  expire: False

runcmd:
  # Set hostname (overrides rootfs default)
  - hostnamectl set-hostname CLOUDHOST 2>/dev/null || echo CLOUDHOST > /etc/hostname
  - sed -i 's/^127.0.0.1.*/127.0.0.1 localhost CLOUDHOST/' /etc/hosts 2>/dev/null || true
  # Bring up eth0 (configured via kernel args)
  - ip link set eth0 up
  - sleep 1
  - ip addr
  # Configure SSH for password login
  - sed -i 's/^#PermitRootLogin.*/PermitRootLogin yes/' /etc/ssh/sshd_config
  - sed -i 's/^#PasswordAuthentication.*/PasswordAuthentication yes/' /etc/ssh/sshd_config
  - sed -i 's/^PasswordAuthentication no/PasswordAuthentication yes/' /etc/ssh/sshd_config
  - sed -i 's/^ChallengeResponseAuthentication no/ChallengeResponseAuthentication yes/' /etc/ssh/sshd_config
  - systemctl restart ssh
  - echo "SSH configured" > /tmp/cloud-init-done.txt