Simply cloud init config to enable tmate

cloud-init-tmate

#cloud-config

# user: test password: test
users:
  - default
  - name: test
    sudo: ALL=(ALL) NOPASSWD:ALL
    groups: users, admin
    ssh_authorized_keys:
      - ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIOKLl0NYKwoZ/JY5KeZU8VwRAggeOxqQJeoqp3dsAaY9 dpawlik@x1
    passwd: $6$IpSPDr7.eOTI2jAO$5Y4oNGAyFRvbwlSo5XLxnVudcktW35FQ77LlFcX7wqCjDwuypW9JVAxCWQJvJgnpS.C6jX.8vN1NvUfp1UZHF0
    lock_passwd: false

ssh_authorized_keys:
  - ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIOKLl0NYKwoZ/JY5KeZU8VwRAggeOxqQJeoqp3dsAaY9 dpawlik@x1
password: test
chpasswd: { expire: False }

write_files:
  - path: /usr/local/bin/tmate.sh
    permissions: '0755'
    content: |
      #!/bin/bash
      /usr/bin/tmate -F &> /tmp/tmate.log &

  - path: /etc/systemd/system/tmate.service
    content: |
      [Install]
      WantedBy=multi-user.target

      [Unit]
      Description=Tmate
      Wants=network-online.target
      After=network-online.target

      [Service]
      User=test
      Group=test
      Type=oneshot
      ExecStart=/usr/local/bin/tmate.sh
      StandardOutput=file:/tmp/tmate-out.log
      StandardError=file:/tmp/tmate-err.log

runcmd:
  - [ dnf, install, -y, epel-release ]
  - [ dnf, install, -y, tmate ]
  - [ systemctl, daemon-reload ]
  - [ systemctl, enable, tmate.service ]
  - [ systemctl, start, tmate.service ]
  - [ systemctl, status, tmate.service ]
  - [ journalctl, -u, tmate.service ]
  - [ systemd-cat, cat, /tmp/tmate.log ]
  - [ systemd-cat, cat, /tmp/tmate-out.log ]
  - [ systemd-cat, cat, /tmp/tmate-err.log ]
  - [ cat, /tmp/tmate.log ]

# If the tmate service is not started, login via web console:
#   openstack console url show <VM NAME>
# then run /usr/local/bin/tmate.sh