Create standard for mandatory and supported IaaS services

Standards/scs-XXXX-vN-mandatory-and-supported-IaaS-services.md

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+---
+title: Mandatory and Supported IaaS Services
+type: Standard
+status: Draft
+track: IaaS
+---
+
+## Introduction
+
+To be SCS-compliant a Cloud Service Provider (CSP) has to fulfill all SCS standards.
+Some of those standards are broad and consider all APIs of all services on the IaaS-Layer like the consideration of a [role standard](https://github.com/SovereignCloudStack/issues/issues/396).
+There exist many services on that layer and for a first step they need to be limited to have a clear scope for the standards and the Cloud Service Providers following them.
+For this purpose, this standard will establish lists for mandatory services whose APIs have to be present in a SCS cloud as well as supported services, which APIs are considered by some standards and may even be tested for their integration but are optional in a sense that their omission will not violate SCS conformance.
+
+## Motivation
+
+There are many OpenStack APIs and their corresponding services that can be deployed on the IaaS level.
+These services have differences in the quality of their implementation and liveness and some of them may be easily omitted when creating an IaaS deployment.
+To fulfill all SCS-provided standards only a subset of these APIs are required.
+Some more but not all remaining OpenStack APIs are also supported additionally by the SCS project and may be part of its reference implementation.
+This results in different levels of support for specific services.
+This document will give readers insight about how the SCS classifies the OpenStack APIs accordingly.
+If a cloud provides all mandatory and any number of supported OpenStack APIs, it can be tested for SCS-compliance.
+Any unsupported APIs will not be tested.
+
+## Mandatory IaaS APIs
+
+The following IaaS APIs MUST be present in SCS-compliant IaaS deployments and could be implemented with the corresponding OpenStack services:
+
+| Mandatory API | corresponding OpenStack Service | description |
+|-----|-----|-----|
+| **block-storage** | Cinder | Block Storage service |
+| **compute** | Nova | Compute service |
+| **identity** | Keystone | Identity service |
+| **image** | Glance | Image service |
+| **load-balancer** | Octavia | Load-balancer service |
+| **network** | Neutron | Networking service |
+| **s3** or **object-store** | S3 API object storage | No formal standard exists, many implementations: Swift, RadosGW, minio... |
+
+:::caution
+
+S3 API implementations may differ in certain offered features.
+CSPs must publicly describe, which implementation they use in their deployment.
+Users should always research whether a needed feature is supported in the offered implementation.
+
+:::
+
+## Supported IaaS APIs
+
+The following IaaS APIs MAY be present in SCS-compliant IaaS deployment, e.g. implemented thorugh the corresponding OpenStack services, and are considered in the SCS standards.
+
+| Supported API | corresponding OpenStack Service | description |
+|-----|-----|-----|
+| **bare-metal** | Ironic | Bare Metal provisioning service |
+| **billing** | Cloudkitty | Rating/Billing service |
+| **dns** | Designate | DNS service |
+| **ha** | Masakari | Instances High Availability service |
+| **key-manager** | Barbican | Key Manager service |
+| **orchestration** | Heat | Orchestration service |
+| **shared-file-systems** | Manila | Shared File Systems service |
+| **telemetry** | Ceilometer | Telemetry service |
+| **time-series-databse** | Gnocchi | Time Series Database service |
+
+## Unsupported IaaS APIs
+
+All other OpenStack services, whose APIs are not mentioned in the mandatory or supported lists will not be tested for their compatibility and conformance in SCS clouds by the SCS community.
+Those services MAY be integrated into IaaS deployments by a Cloud Service Provider on their own responsibility but the SCS will not assume they are present and potential issues that occur during deployment or usage have to be handled by the CSP on their own accord.
+The SCS standard offers no guarantees for compatibility or reliability of services categorized as unsupported.
+
+## Related Documents
+
+[The OpenStack Services](https://www.openstack.org/software/)
+
+## Conformance Tests
+
+The presence of the mandatory OpenStack APIs (except the S3) will be tested in a test-script.
+As the S3 interface is a moving target, it may be integrated into the test suite but the test result will not be taken into account to determine conformance.

Tests/iaas/mandatory-services/mandatory-iaas-services.py

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+"""Mandatory APIs checker
+
+This script retrieves the endpoint catalog from Keystone using the OpenStack
+SDK and checks whether all mandatory APi endpoints, are present.
+The script relies on an OpenStack SDK compatible clouds.yaml file for
+authentication with Keystone.
+As the s3 endpoint might differ, a missing one will only result in a warning.
+"""
+
+import argparse
+import logging
+import os
+
+import openstack
+
+
+logger = logging.getLogger(__name__)
+mandatory_services = ["compute", "identity", "image", "block-storage",
+                      "network", "load-balancer", "placement"]
+object_store_service = ["s3", "object-store"]
+
+
+def connect(cloud_name: str) -> openstack.connection.Connection:
+    """Create a connection to an OpenStack cloud
+    :param string cloud_name:
+        The name of the configuration to load from clouds.yaml.
+    :returns: openstack.connnection.Connection
+    """
+    return openstack.connect(
+        cloud=cloud_name,
+    )
+
+
+def check_presence_of_mandatory_services(cloud_name: str):
+    try:
+        connection = connect(cloud_name)
+        services = connection.service_catalog
+    except Exception as e:
+        print(str(e))
+        raise Exception(
+            f"Connection to cloud '{cloud_name}' was not successfully. "
+            f"The Catalog endpoint could not be accessed. "
+            f"Please check your cloud connection and authorization."
+        )
+
+    for svc in services:
+        svc_type = svc['type']
+        if svc_type in mandatory_services:
+            mandatory_services.remove(svc_type)
+            continue
+        if svc_type in object_store_service:
+            object_store_service.remove(svc_type)
+
+    if len(object_store_service) == 2:
+        # neither s3 nor object-store is available,
+        # but might be named differently
+        logger.warning("No s3 or object-store endpoint found.")
+    if not mandatory_services:
+        # every mandatory service API had an endpoint
+        return 0
+    else:
+        # there were multiple mandatory APIs not found
+        logger.error(f"The following endpoints are missing: "
+                     f"{mandatory_services}")
+        return len(mandatory_services)
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        description="SCS Mandatory IaaS Service Checker")
+    parser.add_argument(
+        "--os-cloud", type=str,
+        help="Name of the cloud from clouds.yaml, alternative "
+        "to the OS_CLOUD environment variable"
+    )
+    parser.add_argument(
+        "--debug", action="store_true",
+        help="Enable OpenStack SDK debug logging"
+    )
+    args = parser.parse_args()
+    openstack.enable_logging(debug=args.debug)
+
+    # parse cloud name for lookup in clouds.yaml
+    cloud = os.environ.get("OS_CLOUD", None)
+    if args.os_cloud:
+        cloud = args.os_cloud
+    assert cloud, (
+        "You need to have the OS_CLOUD environment variable set to your cloud "
+        "name or pass it via --os-cloud"
+    )
+
+    return check_presence_of_mandatory_services(cloud)
+
+
+if __name__ == "__main__":
+    main()