Common Methods for Connecting to a DDS Instance

Mongo Shell

• Prerequisites
  1. To connect an ECS to a DDS instance, run the following command to connect to the IP address and port of the instance server to test the network connectivity.

     curl ip:port

     If the message It looks like you are trying to access MongoDB over HTTP on the native driver port is displayed, the ECS and DDS instance can communicate with each other.

  2. Download the client installation package whose version is the same as the instance version from the MongoDB official website. Decompress the package, obtain the mongo file, and upload it to the ECS.
  3. If SSL is enabled, download the root certificate and upload it to the ECS.

• Connection commands
  • SSL is enabled.

    ./mongo ip:port --authenticationDatabase admin -u username -p password --ssl --sslCAFile $path to certificate authority file --sslAllowInvalidHostnames

  • SSL is disabled.

    ./mongo ip:port --authenticationDatabase admin -u username -p password

    Table 1 Parameter description

    Parameter	Description
    ip	If you access an instance from an ECS, ip is the private IP address of the instance.
    	If you access an instance from a device over a public network, ip is the EIP bound to the instance,
    port	Database port displayed on the Basic Information page. Default value: 8635
    username	Current username
    password	Password of the current username
    path to certificate authority file	Path of the SSL certificate

• Precautions
  1. If SSL is enabled, the connection command must contain --ssl and --sslCAFile.
  2. --authenticationDatabase must be set to admin. If you log in to the database as user rwuser, switch to admin for authentication.

For details, see Connecting to an Instance in Getting Started with Document Database Service.

Python Mongo

• Prerequisites
  1. To connect an ECS to a DDS instance, run the following command to connect to the IP address and port of the instance server to test the network connectivity.

     curl ip:port

     If the message It looks like you are trying to access MongoDB over HTTP on the native driver port is displayed, the network connectivity is normal.

  2. Install Python and third-party installation package pymongo on the ECS. Pymongo 2.8 is recommended.
  3. If SSL is enabled, download the root certificate and upload it to the ECS.
• Input the connection code.
  • SSL is enabled.

    import ssl
    from pymongo import MongoClient
    conn_urls="mongodb://rwuser:rwuserpassword@ip:port/{mydb}?authSource=admin"
    connection = MongoClient(conn_urls,connectTimeoutMS=5000,ssl=True, ssl_cert_reqs=ssl.CERT_REQUIRED,ssl_match_hostname=False,ssl_ca_certs=${path to certificate authority file})
    dbs = connection.database_names()
    print "connect database success! database names is %s" % dbs

  • SSL is disabled.

    import ssl
    from pymongo import MongoClient
    conn_urls="mongodb://rwuser:rwuserpassword@ip:port/{mydb}?authSource=admin"
    connection = MongoClient(conn_urls,connectTimeoutMS=5000)
    dbs = connection.database_names()
    print "connect database success! database names is %s" % dbs

• Precautions
  1. {mydb} is the name of the database to be connected.
  2. The authentication database in the URL must be admin. Set authSource to admin.

Java Mongo

• Prerequisites
  1. To connect an ECS to a DDS instance, run the following command to connect to the IP address and port of the instance server to test the network connectivity.

     curl ip:port

     If the message It looks like you are trying to access MongoDB over HTTP on the native driver port is displayed, the ECS and DDS instance can communicate with each other.

  2. Download the MongoDB JAR package compatible with the instance version by referring to the MongoDB Compatibility table.
  3. JDK is installed on the ECS.
  4. If SSL is enabled, download the root certificate and upload it to the ECS.
• Input the connection code.

  Use keytool to generate a trustStore.

  keytool -import -file /var/chroot/mongodb/CA/ca.crt -keystore /home/Mike/jdk1.8.0_112/jre/lib/security/mongostore -storetype pkcs12 -storepass ****

  

  • /var/chroot/mongodb/CA/ca.crt is the root certificate path.
  • /home/Mike/jdk1.8.0_112/jre/lib/security/mongostore indicates the path of the generated truststore.
  • **** is the password of the trustStore.
  • SSL is enabled.

    import java.util.ArrayList;
    import java.util.List;
    import org.bson.Document;
    import com.mongodb.MongoClient;
    import com.mongodb.MongoCredential;
    import com.mongodb.ServerAddress;
    import com.mongodb.client.MongoDatabase;
    import com.mongodb.client.MongoCollection;
    import com.mongodb.MongoClientURI;
    import com.mongodb.MongoClientOptions;
    public class MongoDBJDBC {
    public static void main(String[] args){
          try {
                  System.setProperty("javax.net.ssl.trustStore", "/home/Mike/jdk1.8.0_112/jre/lib/security/mongostore");
                  System.setProperty("javax.net.ssl.trustStorePassword", "****");
                  ServerAddress serverAddress = new ServerAddress("ip", port);
                  List addrs = new ArrayList();
                  addrs.add(serverAddress);
                  MongoCredential credential = MongoCredential.createScramSha1Credential("rwuser", "admin", "!rwuserPassword".toCharArray());
                  List credentials = new ArrayList();
                  credentials.add(credential);
                  MongoClientOptions opts= MongoClientOptions.builder()
                  .sslEnabled(true)
                  .sslInvalidHostNameAllowed(true)
                  .build();
                  MongoClient mongoClient = new MongoClient(addrs,credentials,opts);
                  MongoDatabase mongoDatabase = mongoClient.getDatabase("testdb");
                  MongoCollection collection = mongoDatabase.getCollection("testCollection");
                  Document document = new Document("title", "MongoDB").
                  append("description", "database").
                  append("likes", 100).
                  append("by", "Fly");
                  List documents = new ArrayList();
                  documents.add(document);
                  collection.insertMany(documents);
                  System.out.println("Connect to database successfully");
                  } catch (Exception e) {
                  System.err.println( e.getClass().getName() + ": " + e.getMessage() );
             }
          }
    }

    Sample codes:

    javac -cp .:mongo-java-driver-3.2.0.jar MongoDBJDBC.java

    java -cp .:mongo-java-driver-3.2.0.jar MongoDBJDBC

  • SSL is disabled.

    import java.util.ArrayList;
    import java.util.List;
    import org.bson.Document;
    import com.mongodb.MongoClient;
    import com.mongodb.MongoCredential;
    import com.mongodb.ServerAddress;
    import com.mongodb.client.MongoDatabase;
    import com.mongodb.client.MongoCollection;
    import com.mongodb.MongoClientURI;
    import com.mongodb.MongoClientOptions;
    public class MongoDBJDBC {
    public static void main(String[] args){
          try {
                  ServerAddress serverAddress = new ServerAddress("ip", port);
                  List addrs = new ArrayList();
                  addrs.add(serverAddress);
                  MongoCredential credential = MongoCredential.createScramSha1Credential("rwuser", "admin", "!rwuserPassword".toCharArray());
                  List credentials = new ArrayList();
                  credentials.add(credential);
                  MongoClient mongoClient = new MongoClient(addrs,credentials);
                  MongoDatabase mongoDatabase = mongoClient.getDatabase("testdb");
                  MongoCollection collection = mongoDatabase.getCollection("testCollection");
                  Document document = new Document("title", "MongoDB").
                  append("description", "database").
                  append("likes", 100).
                  append("by", "Fly");
                  List documents = new ArrayList();
                  documents.add(document);
                  collection.insertMany(documents);
                  System.out.println("Connect to database successfully");
                  } catch (Exception e) {
                  System.err.println( e.getClass().getName() + ": " + e.getMessage() );
             }
            }
    }