Logan V 5842a24cd3 Add external LB management handler hook interface

Based on conversation on an ansible issue[1], I implemented
a LB orchestration role[2] similar to the POC here[3].

This will allow external loadbalancer management roles to hook
into a universal notify listener "Manage LB" to perform before/
after endpoint management actions when the service is being
restarted.

[1]: https://github.com/ansible/ansible/issues/27813
[2]: https://github.com/Logan2211/ansible-haproxy-endpoints
[3]: https://github.com/Logan2211/tmp-ansible-27813

Change-Id: I7d2f47e94826526e9a5a99d32575f691fb6b30fd

2017-11-03 02:55:24 +00:00

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OpenStack-Ansible glance role

configure-glance.rst

This role installs the following Systemd services:

glance-api

glance-registry

To clone or view the source code for this repository, visit the role repository for os_glance.

Default variables

../../defaults/main.yml

Required variables

None

Example playbook

../../examples/playbook.yml

External Restart Hooks

When the role performs a restart of the service, it will notify an Ansible handler named Manage LB, which is a noop within this role. In the playbook, other roles may be loaded before and after this role which will implement Ansible handler listeners for Manage LB, allowing external roles to manage the load balancer endpoints responsible for sending traffic to the servers being restarted by marking them in maintenance or active mode, draining sessions, etc. For an example implementation, please reference the ansible-haproxy-endpoints role used by the openstack-ansible project.

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