Getting Started

This section describes how to use GaussDB(DWS) APIs to manage clusters. The procedure of the management clusters is as follows:

Call the API in Authentication to obtain the user token, which will be put into the request header for authentication in a subsequent request.
Call the API in Querying the Supported Node Types to obtain the supported node types.
Call the API in Creating a Cluster to create a cluster.
Call the API in Querying the Cluster List to obtain the cluster information.
Call the API in Querying Cluster Details to view cluster details.
Call the API in Creating a Snapshot to create a snapshot.
Call the API in Querying Snapshot Details to check whether the snapshot is successfully created.
Call the API in Restoring a Cluster to restore a cluster using its snapshot.
Call the API in Deleting a Manual Snapshot to delete an unwanted snapshot.
Call the API in Deleting a Cluster to delete a finished or unwanted cluster.

Prerequisites

You have created a VPC, subnet, and security group and obtained their IDs. For details, see Creating a VPC.
You have obtained the IAM and GaussDB(DWS) endpoints from the administrator.
You have obtained the project ID. For details, see Obtaining a Project ID.

Managing a Cluster

The following values are examples (replace them based on the actual situation).

IAM endpoint: iam_endpoint
GaussDB(DWS) endpoint: dws_endpoint
VPC ID: 219ab8a0-1272-4049-a383-8ad0b770fa11
Subnet ID: d23ef2e9-8b90-49b3-bc4a-fd7d6bea6bec
Security group ID: 12e3c23a-8710-4b75-95e4-5c8d7f68ef3c
Project ID: 9bc552e6-19af-4326-800d-281a92984636

Perform the following operations to manage the cluster.

Before calling other APIs, call the API in Authentication to obtain the token and set it as an environment variable.

curl -H "Content-type:application/json" https://{iam_endpoint}/v3/auth/tokens -X POST -d '{
    "auth": {
        "identity": {
            "methods": [
                "password"
            ],
            "password": {
                "user": {
                    "name": "testname",
                    "domain": {
                        "name": "testname"
                    },
                    "password": "Passw0rd"
                }
            }
        },
        "scope": {
            "project": {
                "name": "eu-west-101"
            }
        }
    }
}' -v -k

Obtain the value of X-Subject-Token from the response header as follows. X-Subject-Token indicates the token.
```
X-Subject-Token:MIidkgYJKoZIhvcNAQcCoIidgzCCA38CAQExDTALBglghkgBZQMEAgEwgXXXXX...
```
Run the following command to set the token as an environment variable:
export Token={X-Subject-Token}
X-Subject-Token is the token obtained in the preceding step.
```
export Token=MIidkgYJKoZIhvcNAQcCoIidgzCCA38CAQExDTALBglghkgBZQMEAgEwgXXXXX...
```

Call the API in Querying the Supported Node Types to obtain the supported node types.

curl -X GET -H 'Content-type:application/json;charset=utf-8' -H "X-Auth-Token:$Token" https://{dws_endpoint}/v1.0/9bc552e6-19af-4326-800d-281a92984636/node_types -v -k

The request response is as follows:

status CODE 200
{
    "node_types": [
        {
            "spec_name": "dws.d2.xlarge",
            "id": "ebe532d6-665f-40e6-a4d4-3c51545b6a67",
            "detail": [
                {
                    "type": "vCPU", 
                    "value": "4"
                },
                {
                    "value": "1675",
                    "type": "LOCAL_DISK",
                    "unit": "GB"
                },
                {
                    "type": "mem",
                    "value": "32",
                    "unit": "GB"
                }
            ]
        },
        {
            "spec_name": "dws.m1.xlarge.ultrahigh",
            "id": "ebe532d6-665f-40e6-a4d4-3c51545b4f71",
            "detail": [
                {
                    "type": "vCPU",
                    "value": "4"
                },
                {
                    "value": "512",
                    "type": "SSD",
                    "unit": "GB"
                },
                {
                    "type": "mem",
                    "value": "32",
                    "unit": "GB"
                }
            ]
        }
    ]
}

Call the API in Creating a Cluster to create a cluster.

The examples for configuring the cluster are as follows:

Cluster name: dws-demo
Administrator username: dbadmin
Administrator password: Dws2017demo!
Port: 8000
Node type: dws.d1.xlarge
Number of nodes: 3
Elastic IP (EIP): auto_assign

curl -X POST -H 'Content-type:application/json;charset=utf-8' -H "X-Auth-Token:$Token" -d '{
    "node_type": "dws.d1.xlarge",
        "number_of_node": 3,
        "subnet_id": "d23ef2e9-8b90-49b3-bc4a-fd7d6bea6bec",
        "security_group_id": "12e3c23a-8710-4b75-95e4-5c8d7f68ef3c",
        "vpc_id": "219ab8a0-1272-4049-a383-8ad0b770fa11",
        "port": 8000,
        "name": "dws-demo",
        "user_name": "dbadmin",
        "user_pwd": "Dws2017demo!",
        "public_ip": {
            "public_bind_type": "auto_assign"
        }
}' https://{dws_endpoint}/v1.0/9bc552e6-19af-4326-800d-281a92984636/clusters -v -k

If status code 200 is returned, the request for creating a cluster is successfully sent.

Call the API in Querying the Cluster List to obtain the cluster information.

curl -X GET -H 'Content-type:application/json;charset=utf-8' -H "X-Auth-Token:$Token" https://{dws_endpoint}/v1.0/9bc552e6-19af-4326-800d-281a92984636/clusters -k –v

The request response is as follows:

{
        "clusters": [
        {
        "id": "7ba031f6-81f4-4670-ad20-c490b91877e5",
        "status": "AVAILABLE",
        "sub_status": "NORMAL",            
        "task_status": null,
        "action_progress": null,
        "node_type":  "dws.d1.xlarge",
        "subnet_id": "d23ef2e9-8b90-49b3-bc4a-fd7d6bea6bec",
        "security_group_id": "12e3c23a-8710-4b75-95e4-5c8d7f68ef3c",
        "number_of_node": 3,
        "availability_zone": "eu-west-101",
        "port": 8000,
        "name": "dws-demo",
        "version": "1.1.0",
        "vpc_id": "219ab8a0-1272-4049-a383-8ad0b770fa11",
        "user_name": "dbadmin",
        "public_ip": {
            "public_bind_type": "auto_assign",
            "eip_id": "85b20d7e-9eb7-4b2a-98f3-3c8843ea3574"
         },
        "public_endpoints": [
            {
                "public_connect_info": "dws-demo.eu-west-101.myhuaweicloud.com",
                "jdbc_url": "jdbc:postgresql://dws-demo.eu-west-101.myhuaweicloud.com/<YOUR_DATABASE_name>"
            }
         ],
        "endpoints": [
            {
                "connect_info": "dws-demo.eu-west-101.myhuaweicloud.com",
                "jdbc_url": "jdbc:postgresql:///<YOUR_DATABASE_name>"
            },
         ] , 
        "updated": "2018-01-15T12:50:06",
        "created": "2018-01-15T12:50:06", 
        "recent_event": 1
        }
    ]
}

If status is CREATING, the cluster is being created. If status is AVAILABLE, the cluster is successfully created.
The UUID of cluster dws-demo is 7ba031f6-81f4-4670-ad20-c490b91877e5. Record the UUID for subsequent use.

Call the API in Querying Cluster Details to view cluster details.

curl -X GET -H "Content-type:application/json" -H "X-Auth-Token:$Token" 
 https://{dws_endpoint}/v1.0/9bc552e6-19af-4326-800d-281a92984636/clusters/7ba031f6-81f4-4670-ad20-c490b91877e5 -k -v

The request response is as follows:

{
    "cluster": {
        "id": "7ba031f6-81f4-4670-ad20-c490b91877e5",
        "status": "AVAILABLE",
        "name": "dws-demo",
        "updated": "2018-01-15T12:50:06",
        "created": "2018-01-15T12:50:06",
        "user_name": "dbadmin",
        "sub_status": "NORMAL",
        "task_status": null,
        "action_progress": null,
        "node_type":  "dws.d1.xlarge",        
        "node_type_id": "5ddb1071-c5d7-40e0-a874-8a032e81a697",
        "subnet_id": "d23ef2e9-8b90-49b3-bc4a-fd7d6bea6bec",
        "security_group_id": "12e3c23a-8710-4b75-95e4-5c8d7f68ef3c",
        "number_of_node": 3,
        "availability_zone": "eu-west-101",
        "port": 8000,
        "vpc_id": "219ab8a0-1272-4049-a383-8ad0b770fa11",
        "public_ip": {
            "public_bind_type": "auto_assign",
            "eip_id": "85b20d7e-9eb7-4b2a-98f3-3c8843ea3574"
        },
        "public_endpoints": [
        {
                "public_connect_info": "dws-demo.eu-west-101.myhuaweicloud.com",
                "jdbc_url": "jdbc:postgresql:///<YOUR_DATABASE_name>"
         }
         ],
        "endpoints": [
        {
                "connect_info": "dws-demo.eu-west-101.myhuaweicloud.com",
                "jdbc_url": "jdbc:postgresql://dws-demo.eu-west-101.myhuaweicloud.com/<YOUR_DATABASE_name>"
        }
         ],
        "version": "1.1.0",
        "maintain_window": {
            "day": "Wed",
            "start_time": "22:00",
            "end_time": "02:00"
        }, 
        "recent_event": 1,
        "tags": null, 
        "parameter_group": {
              "id": "157e9cc4-64a8-11e8-adc0-fa7ae01bbebc",               "name": "Default-Parameter-Group-dws ",               "status": "In-Sync"
        } 
    }
}

public_endpoints and endpoints can be queried from the response. After the cluster is successfully created, you can use public_endpoints or endpoints to access the cluster from an external source.

Call the API in Creating a Snapshot to create a snapshot.

Create snapshot snapshotForDemoCluster for cluster dws-demo.

curl -X POST -H "Content-type:application/json" -H "X-Auth-Token:$Token" -d '{
    "snapshot": {
        "name": "snapshotForDemoCluster",
        "cluster_id": "7ba031f6-81f4-4670-ad20-c490b91877e5",
        "description": "Snapshot description" 
    }
}' https://{dws_endpoint}/v1.0/9bc552e6-19af-4326-800d-281a92984636/snapshots -k -v

The request response is as follows:

{
  "snapshot": { 
      "id": "2a4d0f86-67cd-408a-8b66-017454fb7793" 
  }
}

If status code 200 is returned, the request for creating a snapshot is successfully sent. Record id so that the ID can be used when you query the snapshot details later.

Call the API in Querying Snapshot Details to check whether the snapshot is successfully created.

curl -X GET -H 'Content-type:application/json;charset=utf-8' -H "X-Auth-Token:$Token" https://{dws_endpoint}/v1.0/9bc552e6-19af-4326-800d-281a92984636/snapshots/2a4d0f86-67cd-408a-8b66-017454fb7793 -k -v

If the snapshot status in the response is AVAILABLE, the snapshot is successfully created. If the snapshot status is CREATING, the snapshot is being created.

{ 
    "snapshot": { 
        "id": "2a4d0f86-67cd-408a-8b66-017454fb7793", 
        "name": "snapshotForDemoCluster", 
        "description": "Snapshot description", 
        "started": "2018-01-18T13:59:23Z", 
        "finished": "2018-01-18T13:01:40Z",
        "size": 500, 
        "status": "AVAILABLE", 
        "type": "MANUAL", 
        "cluster_id": "4f87d3c4-9e33-482f-b962-e23b30d1a18c" 
    } 
}

Call the API in Restoring a Cluster to restore a cluster using its snapshot.
Restore snapshot snapshotForDemoCluster to new cluster dws-restore.
```
curl -X POST -H 'Content-type:application/json;charset=utf-8' -H "X-Auth-Token:$Token" -d '{
    "restore": {
        "name": "dws-restore"
    }
}' https://{dws_endpoint}/v1.0/9bc552e6-19af-4326-800d-281a92984636/snapshots/2a4d0f86-67cd-408a-8b66-017454fb7793/actions -v -k
```
If status code 200 is returned, the cluster is successfully restored. You can check the cluster restoration status by performing operations in Querying Cluster Details.

Call the API in Deleting a Manual Snapshot to delete an unwanted snapshot.

curl -X DELETE -H 'Content-type:application/json;charset=utf-8' -H "X-Auth-Token:$Token" https://{dws_endpoint}/v1.0/9bc552e6-19af-4326-800d-281a92984636/snapshots/2a4d0f86-67cd-408a-8b66-017454fb7793 -v -k

If status code 202 is returned, the snapshot is successfully deleted.

Call the API in Deleting a Cluster to delete an unwanted cluster.

curl -X DELETE -H 'Content-type:application/json;charset=utf-8' -H "X-Auth-Token:$Token" -d '{
    "keep_last_manual_snapshot":0
}' https://{dws_endpoint}/v1.0/9bc552e6-19af-4326-800d-281a92984636/clusters/7ba031f6-81f4-4670-ad20-c490b91877e5 -v -k

If status code 202 is returned, the cluster is successfully deleted.

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