Validando versão do ansible

vagrant@ubuntu-bionic ~> ansible-playbook --version 
ansible-playbook 2.5.1
  config file = /etc/ansible/ansible.cfg
  configured module search path = [u'/home/vagrant/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python2.7/dist-packages/ansible
  executable location = /usr/bin/ansible-playbook
  python version = 2.7.15+ (default, Oct  7 2019, 17:39:04) [GCC 7.4.0]

Resultado da execução do playbook

vagrant@ubuntu-bionic ~> ansible-playbook -i /vagrant/configs/ansible/hosts /vagrant/configs/ansible/playbook.yml 
ERROR! Syntax Error while loading YAML.
  mapping values are not allowed in this context

The error appears to have been in '/vagrant/configs/ansible/playbook.yml': line 4, column 13, but may
be elsewhere in the file depending on the exact syntax problem.

The offending line appears to be:

- hosts: all
    handlers:
            ^ here

Arquivo playbook.yml

O arquivo playbook.yml foi copiado diretamente da aula em questão.

- hosts: all
    handlers:
        - name: restart mysql
            service:
                name: mysql
                state: restarted
            become: yes

    tasks:
        - name: 'Instalar MySQL Server'
            apt:
                update_cache: yes
                cache_valid_time: 3600 #1 hora
                name: ["mysql-server-5.7", "python3-mysqldb"]
                state: latest
            become: yes

        - name: 'Criar usuario no MySQL'
            mysql_user:
                login_user: root
                name: phpuser
                password: pass
                priv: '*.*:ALL'
                host: '%'
                state: present
            become: yes

        - name: 'Copiar arquivo mysqld.cnf'
            copy:
                src: /vagrant/configs/mysqld.cnf
                dest: /etc/mysql/mysql.conf.d/mysqld.cnf
                owner: root
                group: root
                mode: 0644
            become: yes
            notify:
                - restart mysql