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1. Migrate Ops chapter and tips and tricks appendix to developer docs 2. Migrate Appendix G to a chapter in the developer docs 3. Minor edits Change-Id: I4070f02b75a8f9614545be0744e63ba76a3b49e2 Implements: blueprint osa-install-guide-overhaul
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Tips and tricks
Ansible forks
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. However, you can increase the number of forks used in order to improve deployment performance in large environments.
Note that more than 10 forks will cause issues for any playbooks
which use delegate_to or local_action in the
tasks. It is recommended that the number of forks are not raised when
executing against the Control Plane, as this is where delegation is most
often used.
The number of forks used may be changed on a permanent basis by
including the appropriate change to the ANSIBLE_FORKS in
your .bashrc file. Alternatively it can be changed for a
particular playbook execution by using the --forks CLI
parameter. For example, the following executes the nova playbook against
the control plane with 10 forks, then against the compute nodes with 50
forks.
# openstack-ansible --forks 10 os-nova-install.yml --limit compute_containers
# openstack-ansible --forks 50 os-nova-install.yml --limit compute_hostsFor more information about forks, please see the following references:
- OpenStack-Ansible Bug 1479812
- Ansible forks entry for ansible.cfg
- Ansible Performance Tuning