Connecting to a GeminiDB DynamoDB Instance
This section describes how to connect to a GeminiDB DynamoDB instance in Java or using Python.
Prerequisites
- A GeminiDB DynamoDB instance has been created.
- For details about how to create an ECS, see Purchasing an ECS in Getting Started with Elastic Cloud Server.
- JDK has been installed on the ECS.
Obtaining the IP Address of a GeminiDB DynamoDB Instance
- Log in to the GeminiDB console.
- In the service list, choose Databases > GeminiDB DynamoDB API.
- On the Instances page, click the name of the target instance.
The port number of the GeminiDB DynamoDB instance is 8000.
Method 1
In the Node Information area on the Basic Information page, obtain the private IP address or EIP of each node.
Figure 1 Obtaining IP addresses
Method 2
In the navigation pane on the left, click Connections to obtain the private IP addresses and EIPs of the instance.
Figure 2 Obtaining IP addresses
Using the Load Balancing Plug-in to Connect to a GeminiDB DynamoDB Instance
- Contact the customer service personnel to obtain required JAR packages and plug-in code.
- Replace the IP address in the following code example with the IP address queried in 3.
The following is a Java code example:
package com.huawei.dbs.test; import com.huawei.dbs.RequestHandler; import com.amazonaws.SDKGlobalConfiguration; import com.amazonaws.auth.AWSCredentialsProvider; import com.amazonaws.auth.AWSStaticCredentialsProvider; import com.amazonaws.auth.BasicAWSCredentials; import com.amazonaws.services.dynamodbv2.AmazonDynamoDB; import com.amazonaws.services.dynamodbv2.AmazonDynamoDBClientBuilder; import com.amazonaws.services.dynamodbv2.document.DynamoDB; import com.amazonaws.services.dynamodbv2.document.TableCollection; import java.net.URI; import java.security.cert.X509Certificate; import javax.net.ssl.HttpsURLConnection; import javax.net.ssl.SSLContext; import javax.net.ssl.TrustManager; import javax.net.ssl.X509TrustManager; public class V1Demo { public static AWSCredentialsProvider myCredentials = new AWSStaticCredentialsProvider( new BasicAWSCredentials("your.ak", "your.sk")); public static String ip = "***.***.***.***"; public static void main(String[] args) { disableCertificateChecks(); AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard() .withRegion("region-a") .withRequestHandlers(new RequestHandler(URI.create("http://" + ip + "8000"))) .withCredentials(myCredentials) .build(); DynamoDB dynamoDB = new DynamoDB(client); TableCollection res = dynamoDB.listTables(); System.out.println(res); } static void disableCertificateChecks() { System.setProperty(SDKGlobalConfiguration.DISABLE_CERT_CHECKING_SYSTEM_PROPERTY, "true"); TrustManager[] trustAllCerts = new TrustManager[] { new X509TrustManager() { public java.security.cert.X509Certificate[] getAcceptedIssuers() { return null; } public void checkClientTrusted(X509Certificate[] certs, String authType) { } public void checkServerTrusted(X509Certificate[] certs, String authType) { } } }; try { SSLContext sc = SSLContext.getInstance("SSL"); sc.init(null, trustAllCerts, new java.security.SecureRandom()); HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory()); } catch (Exception e) { e.printStackTrace(); } HttpsURLConnection.setDefaultHostnameVerifier((arg0, arg1) -> true); } }
The following is a Python code example:
#!/usr/bin/python import boto3 import boto3_lb ip = '***.***.***.***' url = boto3_lb.setup([ip], 'http', 8000, 'fake.url.com') dynamodb = boto3.resource('dynamodb', endpoint_url=url, aws_access_key_id='ak', aws_secret_access_key='sk', region_name="region-a") url = boto3_lb.setup_single_connection([ip], 'http', 8000, 'fake.url.com') dynamodb = boto3.resource('dynamodb', endpoint_url=url, aws_access_key_id='ak', aws_secret_access_key='sk', region_name="region-a")
GeminiDB DynamoDB instances are compatible with DynamoDB APIs. For details about common operations, see DynamoDB official documents.
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