Home OpenStack-Ansible Installation Guide
The default MaxSessions setting for the OpenSSH Daemon is 10. Each Ansible fork makes use of a Session. By default Ansible sets the number of forks to 5, but a deployer may wish to increase the number of forks used in order to improve deployment performance in large environments.
This may be done on a permanent basis by adding the forks configuration entry in ansible.cfg, or for a particular playbook execution by using the --forks CLI parameter. For example, to execute the os-keystone-install.yml playbook using 10 forks:
# openstack-ansible --forks 10 os-keystone-install.yml