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authorRussell Teague <rteague@redhat.com>2017-09-06 15:57:05 -0400
committerRussell Teague <rteague@redhat.com>2017-09-06 15:57:05 -0400
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[Proposal] OpenShift-Ansible Playbook Consolidation
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+# OpenShift-Ansible Playbook Consolidation
+
+## Description
+The designation of `byo` is no longer applicable due to being able to deploy on
+physical hardware or cloud resources using the playbooks in the `byo` directory.
+Consolidation of these directories will make maintaining the code base easier
+and provide a more straightforward project for users and developers.
+
+The main points of this proposal are:
+* Consolidate initialization playbooks into one set of playbooks in
+ `playbooks/init`.
+* Collapse the `playbooks/byo` and `playbooks/common` into one set of
+ directories at `playbooks/openshift-*`.
+
+This consolidation effort may be more appropriate when the project moves to
+using a container as the default installation method.
+
+## Design
+
+### Initialization Playbook Consolidation
+Currently there are two separate sets of initialization playbooks:
+* `playbooks/byo/openshift-cluster/initialize_groups.yml`
+* `playbooks/common/openshift-cluster/std_include.yml`
+
+Although these playbooks are located in the `openshift-cluster` directory they
+are shared by all of the `openshift-*` areas. These playbooks would be better
+organized in a `playbooks/init` directory collocated with all their related
+playbooks.
+
+In the example below, the following changes have been made:
+* `playbooks/byo/openshift-cluster/initialize_groups.yml` renamed to
+ `playbooks/init/initialize_host_groups.yml`
+* `playbooks/common/openshift-cluster/std_include.yml` renamed to
+ `playbooks/init/main.yml`
+* `- include: playbooks/init/initialize_host_groups.yml` has been added to the
+ top of `playbooks/init/main.yml`
+* All other related files for initialization have been moved to `playbooks/init`
+
+The `initialize_host_groups.yml` playbook is only one play with one task for
+importing variables for inventory group conversions. This task could be further
+consolidated with the play in `evaluate_groups.yml`.
+
+The new standard initialization playbook would be
+`playbooks/init/main.yml`.
+
+
+```
+
+> $ tree openshift-ansible/playbooks/init
+.
+├── evaluate_groups.yml
+├── initialize_facts.yml
+├── initialize_host_groups.yml
+├── initialize_openshift_repos.yml
+├── initialize_openshift_version.yml
+├── main.yml
+├── roles -> ../../roles
+├── validate_hostnames.yml
+└── vars
+ └── cluster_hosts.yml
+```
+
+```yaml
+# openshift-ansible/playbooks/init/main.yml
+---
+- include: initialize_host_groups.yml
+
+- include: evaluate_groups.yml
+
+- include: initialize_facts.yml
+
+- include: validate_hostnames.yml
+
+- include: initialize_openshift_repos.yml
+
+- include: initialize_openshift_version.yml
+```
+
+### `byo` and `common` Playbook Consolidation
+Historically, the `byo` directory coexisted with other platform directories
+which contained playbooks that then called into `common` playbooks to perform
+common installation steps for all platforms. Since the other platform
+directories have been removed this separation is no longer necessary.
+
+In the example below, the following changes have been made:
+* `playbooks/byo/openshift-master` renamed to
+ `playbooks/openshift-master`
+* `playbooks/common/openshift-master` renamed to
+ `playbooks/openshift-master/private`
+* Original `byo` entry point playbooks have been updated to include their
+ respective playbooks from `private/`.
+* Symbolic links have been updated as necessary
+
+All user consumable playbooks are in the root of `openshift-master` and no entry
+point playbooks exist in the `private` directory. Maintaining the separation
+between entry point playbooks and the private playbooks allows individual pieces
+of the deployments to be used as needed by other components.
+
+```
+openshift-ansible/playbooks/openshift-master
+> $ tree
+.
+├── config.yml
+├── private
+│   ├── additional_config.yml
+│   ├── config.yml
+│   ├── filter_plugins -> ../../../filter_plugins
+│   ├── library -> ../../../library
+│   ├── lookup_plugins -> ../../../lookup_plugins
+│   ├── restart_hosts.yml
+│   ├── restart_services.yml
+│   ├── restart.yml
+│   ├── roles -> ../../../roles
+│   ├── scaleup.yml
+│   └── validate_restart.yml
+├── restart.yml
+└── scaleup.yml
+```
+
+```yaml
+# openshift-ansible/playbooks/openshift-master/config.yml
+---
+- include: ../init/main.yml
+
+- include: private/config.yml
+```
+
+The following examples shows how multiple components would be combined to
+perform a complete install.
+
+```yaml
+# openshift-ansible/playbooks/openshift-cluster/config.yml
+---
+- include: ../init/main.yml
+
+- include: private/config.yml
+```
+
+```yaml
+# openshift-ansible/playbooks/openshift-cluster/private/config.yml
+---
+- include: ../../openshift-etcd/private/config.yml
+
+- include: ../../openshift-nfs/private/config.yml
+
+- include: ../../openshift-loadbalancer/private/config.yml
+
+- include: ../../openshift-master/private/config.yml
+
+- include: ../../openshift-node/private/config.yml
+
+- include: ../../openshift-glusterfs/private/config.yml
+
+- include: openshift_hosted.yml
+
+- include: service_catalog.yml
+ when:
+ - openshift_enable_service_catalog | default(false) | bool
+```
+
+## User Story
+As a developer of OpenShift-Ansible,
+I want simplify the playbook directory structure
+so that users can easily find deployment playbooks and developers know where new
+features should be developed.
+
+## Implementation
+Given the size of this refactoring effort, it should be broken into smaller
+steps which can be completed independently while still maintaining a functional
+project.
+
+Steps:
+1. Update and merge consolidation of the initialization playbooks.
+2. Update each merge consolidation of each `openshift-*` component area
+3. Update and merge consolidation of `openshift-cluster`
+
+## Acceptance Criteria
+* Verify that all entry points playbooks install or configure as expected.
+* Verify that CI is updated for testing new playbook locations.
+* Verify that repo documentation is updated
+* Verify that user documentation is updated
+
+## References