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Logan V 5108e06793 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: I19818234d9c8a5ad90b6387c360d598fda03a65e

2017-09-16 13:54:06 -05:00

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Cinder role for OpenStack-Ansible

This Ansible role installs and configures OpenStack cinder.

The following cinder services are managed by the role:

cinder-api
cinder-volume
cinder-scheduler

By default, cinder API v1 and v2 are both enabled.

configure-cinder.rst

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

Default variables

../../defaults/main.yml

Required variables

This list is not exhaustive at present. See role internals for further details.

# Comma separated list of Glance API servers
cinder_glance_api_servers: "http://glance_server:9292"

# Hostname or IP address of the Galera database
cinder_galera_address: "1.2.3.4"

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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