Make Ansible reboot remote hosts and wait for them to return

ansible-reboot-and-wait.yaml

---
- name: Reboot a host and wait for it to return
  hosts: somehost
  remote_user: root
  tasks:
    # Send the reboot command
    - shell: shutdown -r now

    # This pause is mandatory, otherwise the existing control connection gets reused!
    - pause: seconds=30

    # Now we will run a local 'ansible -m ping' on this host until it returns.
    # This works with the existing ansible hosts inventory and so any custom ansible_ssh_hosts definitions are being used
    - local_action: shell ansible -u {{ ansible_user_id }} -m ping {{ inventory_hostname }}
      register: result
      until: result.rc == 0
      retries: 30
      delay: 10

    # And finally, execute 'uptime' when the host is back.
    - shell: uptime

I am running ansible version 2.9.6 and the above playbook yaml is giving errors - probably because of the version. I am trying to do a reboot of multiple servers. I've read documentation but am still getting errors on the syntax:

* name: Reboot servers

* hosts: all

* remote_user: root
  tasks:

* shell: /sbin/reboot

Running a --check is giving me a syntax error on the line tasks. It is hard to tell whether every line needs a - in front or whether I have this in the wrong order. I am going into this completely blinding and haven't used ansible before. Thanks for any help.

Please use a code block to show your code, because indentation matters and it got removed by github

Sorry the * should be a hyphen and I have one space between the hyphen and the name. I also have one space between the colon and the description. I will google how to use a code block meanwhile.

This code is outdated; see comments for better options, most notablly https://docs.ansible.com/ansible/latest/collections/ansible/builtin/reboot_module.html

Thanks, yes I did see that. Based on that, I tried:

- hosts: all
- name: rebooting servers
reboot:

And I get this:

ERROR! Syntax Error while loading YAML.
did not find expected '-' indicator

The offending line appears to be:

• name: rebooting servers
  reboot:
  ^ here

I apologize in advance if my block code above doesn't work

tasks:
  - name: Reboot the server
    reboot:

  - pause:
      prompt: "Need delay for restart"
      seconds: 30