Good Starter Cloud Init Config

#cloud-config
users:
  - name: user
    groups: users, admin
    sudo: ALL=(ALL) NOPASSWD:ALL
    shell: /bin/bash
    ssh_authorized_keys:
      - <update with public ssh key>
chpasswd:
  list: |
    root:<secure-password-here>
  expire: False
packages:
  - fail2ban
  - ufw
package_update: true
package_upgrade: true
runcmd:
  - printf "[sshd]\nenabled = true\nbanaction = iptables-multiport" > /etc/fail2ban/jail.local
  - systemctl enable fail2ban
  - ufw default deny incoming
  - ufw default allow outgoing
  - ufw allow 2022/tcp
  - ufw enable
  - sed -i -e '/^\(#\|\)PermitRootLogin/s/^.*$/PermitRootLogin no/' /etc/ssh/sshd_config
  - sed -i -e '/^\(#\|\)Port 22/s/^.*$/Port 2022/' /etc/ssh/sshd_config
  - sed -i -e '/^\(#\|\)PasswordAuthentication/s/^.*$/PasswordAuthentication no/' /etc/ssh/sshd_config
  - sed -i -e '/^\(#\|\)KbdInteractiveAuthentication/s/^.*$/KbdInteractiveAuthentication no/' /etc/ssh/sshd_config
  - sed -i -e '/^\(#\|\)ChallengeResponseAuthentication/s/^.*$/ChallengeResponseAuthentication no/' /etc/ssh/sshd_config
  - sed -i -e '/^\(#\|\)MaxAuthTries/s/^.*$/MaxAuthTries 2/' /etc/ssh/sshd_config
  - sed -i -e '/^\(#\|\)AllowTcpForwarding/s/^.*$/AllowTcpForwarding no/' /etc/ssh/sshd_config
  - sed -i -e '/^\(#\|\)X11Forwarding/s/^.*$/X11Forwarding no/' /etc/ssh/sshd_config
  - sed -i -e '/^\(#\|\)AllowAgentForwarding/s/^.*$/AllowAgentForwarding no/' /etc/ssh/sshd_config
  - sed -i -e '/^\(#\|\)AuthorizedKeysFile/s/^.*$/AuthorizedKeysFile .ssh\/authorized_keys/' /etc/ssh/sshd_config
  - sed -i '$a AllowUsers user' /etc/ssh/sshd_config
  - systemctl enable ssh
  - reboot