CouchDB Configuration Groups

Launchpad Blueprint: https://blueprints.launchpad.net/trove/+spec/couchdb-configuration-groups

Problem Description

The CouchDB datastore currently does not support configuration groups.

Proposed Change

The patch set will implement configuration groups for CouchDB.

CouchDB stores its configuration in ‘local.ini’ file.

Most configuration properties will be available via configuration groups. Some, however, do not make sense in the Trove context.

These include (will be documented in the configuration template):

  • guestagent specific (e.g. file paths, passwords, file access rules)
  • items that Trove needs to control (replication/clustering/log properties)

See Available Configuration Properties for the full list of supported options.

Configuration

None

Database

None

Public API

None

Public API Security

None

Python API

None

CLI (python-troveclient)

None

Internal API

CLI (python-troveclient)

This work will enable the following client commands:

  • configuration-attach
  • configuration-detach

Guest Agent

  • Implement update_overrides and apply_overrides in the manager and service modules.
  • A configuration template and validation rules with changes noted in Available Configuration Properties will be provided.

The existing ‘IniCodec’ implementation will be reused to handle text-file operations.

Alternatives

None

Dashboard Impact (UX)

None

Implementation

Assignee(s)

Sonali Goyal <sonaligoyal654321@gmail.com> Victoria Martinez de la Cruz <victoria@redhat.com>

Milestones

Netwon-1

Work Items

All changes will be done in the context of a single task.

  1. Implement configuration-related manager API calls:

    def update_overrides(self, context, overrides, remove=False)
    def apply_overrides(self, context, overrides)
    

Upgrade Implications

None

Dependencies

The patch set will be building on functionality implemented in blueprint: couchdb-database-user-functions

Testing

The change is largely covered by the existing configuration tests. Unit tests will be added to validate any CouchDB-specific codepaths.

Documentation Impact

The datastore documentation should be updated to reflect the enabled features.

References

[1]Documentation on CouchDB configuration: http://docs.couchdb.org/en/stable/config/index.html

Appendix

Available Configuration Properties

The properties configurable by the user via the Trove API:
[attachments] - compressible_types - compression_level [couchdb] - delayed_commits - max_attachment_chunk_size - attachment_stream_buffer_size - max_dbs_open - max_document_size - os_process_timeout [daemons] - auth_cache - db_update_notifier - external_manager - httpd - httpsd - query_servers - stats_aggregator - stats_collector - uuids - view_manager - vhosts [httpd] - allow_jsonp - authentication_handlers - changes_timeout - config_whitelist - default_handler - enable_cors - log_max_chunk_size - redirect_vhost_handler - secure_rewrites - server_options - socket_options - vhost_global_handlers - x_forwarded_host - x_forwarded_proto - x_forwarded_ssl [replicator] - checkpoint_interval - connection_timeout - db - http_connections - max_replication_retry_count - retries_per_request - socket_options - ssl_certificate_max_depth - ssl_trusted_certificates_file - use_checkpoints - verify_ssl_certificates - worker_batch_size - worker_processes [query_server_config] - commit_freq - os_process_limit - reduce_limit [os_daemon_settings] - max_retries - retry_time [couch_httpd_auth] - allow_persistent_cookies - auth_cache_size - authentication_db - authentication_redirect - iterations - max_iterations - min_iterations - proxy_use_secret - public_fields - require_valid_user - secret - timeout - users_db_public - x_auth_roles - x_auth_token - x_auth_username - use_users_db [compaction_daemon] - check_interval - min_file_size [database_compaction] - doc_buffer_size - checkpoint_after [log] - include_sasl - level [view_compaction] - keyvalue_buffer_size

Guestagent-controlled properties:

[httpd] - port - bind_address [log] - file [couchdb] - uri_file - util_driver_dir - view_index_dir - database_dir