ansible multi -a "hostname" -i hosts -u vagrant
ansible multi -a "hostname" -i hosts -f 1 -u vagrant
ansible multi -a "df -h" -i hosts -u vagrant
ansible multi -a "free -m" -i hosts -u vagrant
ansible multi -a "date" -i hosts -u vagrant
ansible db -m setup -i hosts -u vagrant
ansible multi -b -m yum -a "name=ntp state=present" -i hosts -u vagrant
ansible multi -b -m service -a "name=ntpd state=started" -i hosts -u vagrant
ansible multi -b -a "service ntpd stop" -i hosts -u vagrant
ansible multi -b -a "ntpdate -q 0.rhel.pool.ntp.org" -i hosts -u vagrant
ansible multi -b -a "service ntpd start" -i hosts -u vagrant
default module 是 command,出處在此 https://docs.ansible.com/ansible/latest/user_guide/intro_adhoc.html#rebooting-servers,裡面有一句話:So far all our examples have used the default ‘command’ module.