I have turn on the port-forward with rhc, it shows
mongodb 127.0.0.1:27017 => xxx.x.xxx.x:27017
doc here port-forward
but I still have no luck connect to that mongodb cartridge. I've try both mongo shell 3.0 and java MongoClient.
mongo shell return error 10061
java return com.mongodb.MongoTimeoutException: Timed out after 10000 ms while waiting for a server that matches AnyServerSelector{}
what else could I try to connect to openshift mongodb remotely?
my code, I've test this on local mongodb which works fine
String mongoUri = "mongodb://admin:password#xxx.x.xxx.x:27017/";
MongoClient mongoClient;
try {
mongoClient = new MongoClient(new MongoClientURI(mongoUri));
DB db = mongoClient.getDB("mycoll");
DBCollection cc = db.getCollection("DBObject");
cc.insert(dbo);
}
You should be using the following connection string locally while you have port forwarding enabled:
String mongoUri = "mongodb://admin:password#127.0.0.1:27017/";
Since the connection is being forwarded over an ssh tunnel, you need to use the local port. See this answer for more information: OpenShift: How to connect to postgresql from my PC
Related
Please hear me out.
I am able to successfully write to Azure SQL server table using Apache Spark connector in Dataproc cluster. But then while testing I found sometime that the SQL server database in not available and because of this the write operation fails.
So, I decided to add an exception logic to check if the database is available or not using the following code before writing to Azure DB,
var connection: Connection = null
val url = "jdbc:sqlserver://***.database.windows.net:1433;databaseName=some_db;encrypt=true;trustServerCertificate=true;authentication=ActiveDirectoryPassword"
val user = "xxxx"
val password = ******
try
{
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver")
connection = DriverManager.getConnection(url, user, password)
log.info(s"Successfully established connection on attempt: "+attempts)
return
}
This code works fine in my local machine. But while running the same in Dataproc I am getting the below error,
Exception in thread "main" java.lang.NoClassDefFoundError: com/microsoft/aad/adal4j/AuthenticationException
I already went though this similar issue discussed in SO. But it's bit different for me as the Apache Spark connector to write to SQL server is working fine. I just want to have the code DriverManager.getConnection(url, user, password) work to test the connection before my write.
I have created a MongoDB instance in OpenShift. I can connect to it via RockMongo, which is a service offered by OpenShift.
I'm trying to connect to my instance using JAVA, but I just receive a Connection refuesed error. Moreover, I cannot connect it using RoboMongo.
In my RockMongo status tab, I see the following information:
Host: 127.11.201.2
Port: 27017
Using RoboMongo with MongoLab instance works just fine giving it the right credentials, but here with OpenShift it fails on connecting to the instance.
In my JAVA app I'm trying the following:
MongoCredential credential = MongoCredential.createCredential(
Const.MONGO_USERNAME, Cont.MONGO_DB,
Const.MONGO_PASSWORD.toCharArray());
mongo = new MongoClient(new ServerAddress(Const.MONGO_URI), Arrays.asList(credential));
With 127.11.201.2 as MONGO_URI.
Why am I failing to connect to my instance? What am I doing wrong?
P.S using putty I am able to connect to my mongo instance by just executing the command mongo.
OpenShift provides environment variables, which you should use to connect to your MongoDB.
OPENSHIFT_MONGODB_DB_HOST The MongoDB IP address
OPENSHIFT_MONGODB_DB_PORT The MongoDB port
OPENSHIFT_MONGODB_DB_USERNAME The MongoDB username
OPENSHIFT_MONGODB_DB_PASSWORD The MongoDB password
OPENSHIFT_MONGODB_DB_URL The MongoDB connection URL (e.g. mongodb://<username>:<password>#<hostname>:<port>/)
I'm using one line of code to connect to the database:
new MongoClient(new MongoClientURI(System.getenv("OPENSHIFT_MONGODB_DB_URL")));
I have created a MongoDB instance in OpenShift. I can connect to it via RockMongo, which is a service offered by OpenShift.
I'm trying to connect to my instance using JAVA, but I just receive a Connection refuesed error. Moreover, I cannot connect it using RoboMongo.
In my RockMongo status tab, I see the following information:
Host: 127.11.201.2
Port: 27017
Using RoboMongo with MongoLab instance works just fine giving it the right credentials, but here with OpenShift it fails on connecting to the instance.
In my JAVA app I'm trying the following:
MongoCredential credential = MongoCredential.createCredential(
Const.MONGO_USERNAME, Cont.MONGO_DB,
Const.MONGO_PASSWORD.toCharArray());
mongo = new MongoClient(new ServerAddress(Const.MONGO_URI), Arrays.asList(credential));
With 127.11.201.2 as MONGO_URI.
Why am I failing to connect to my instance? What am I doing wrong?
P.S using putty I am able to connect to my mongo instance by just executing the command mongo.
OpenShift provides environment variables, which you should use to connect to your MongoDB.
OPENSHIFT_MONGODB_DB_HOST The MongoDB IP address
OPENSHIFT_MONGODB_DB_PORT The MongoDB port
OPENSHIFT_MONGODB_DB_USERNAME The MongoDB username
OPENSHIFT_MONGODB_DB_PASSWORD The MongoDB password
OPENSHIFT_MONGODB_DB_URL The MongoDB connection URL (e.g. mongodb://<username>:<password>#<hostname>:<port>/)
I'm using one line of code to connect to the database:
new MongoClient(new MongoClientURI(System.getenv("OPENSHIFT_MONGODB_DB_URL")));
I write a Java program to connect MongoDb and write some data into it. For example I set up the MongoDb on 192.168.1.95 and run my program on that server. When I use the following code:
MongoClient mongo = new MongoClient("localhost", 27017);
It is working and no any problem. However, if I use
MongoClient mongo = new MongoClient("192.168.1.95", 27017);
It always throw a exception for me:
Exception in thread "main" com.mongodb.MongoException: unauthorized
at com.mongodb.CommandResult.getException(CommandResult.java:100)
at com.mongodb.CommandResult.throwOnError(CommandResult.java:134)
at com.mongodb.DBTCPConnector._checkWriteError(DBTCPConnector.java:142)
at com.mongodb.DBTCPConnector.say(DBTCPConnector.java:183)
at com.mongodb.DBTCPConnector.say(DBTCPConnector.java:155)
at com.mongodb.DBApiLayer$MyCollection.insert(DBApiLayer.java:270)
at com.mongodb.DBApiLayer$MyCollection.insert(DBApiLayer.java:226)
at com.mongodb.DBCollection.insert(DBCollection.java:75)
at com.mongodb.DBCollection.insert(DBCollection.java:59)
at com.mongodb.DBCollection.insert(DBCollection.java:104)
at com.starscriber.mongoCluster.Main.main(Main.java:29)
Why cannot I use the exactly Ip instead of "localhost"?? And I am pretty sure that I don't need any username and password to log into the MongoDb
Sounds like auth=true in your MongoDB server configuration. If so, you need to log in to your server by connecting over the localhost interface for the first time to create user credentials. For more info see section "Security Considerations" in the Run-time Database Configuration page of the MongoDB manual
I'm getting the following error:
נוב 08, 2013 12:05:46 PM com.mongodb.DBTCPConnector initDirectConnection
WARNING: Exception executing isMaster command on localhost/127.0.0.1:27017
java.io.IOException: couldn't connect to [localhost/127.0.0.1:27017] bc:java.net.ConnectException: Connection refused: connect
at com.mongodb.DBPort._open(DBPort.java:214)
at com.mongodb.DBPort.go(DBPort.java:107)
at com.mongodb.DBPort.go(DBPort.java:88)
at com.mongodb.DBPort.findOne(DBPort.java:143)
at com.mongodb.DBPort.runCommand(DBPort.java:148)
at com.mongodb.DBTCPConnector.initDirectConnection(DBTCPConnector.java:548)
at com.mongodb.DBTCPConnector.checkMaster(DBTCPConnector.java:527)
at com.mongodb.DBTCPConnector.innerCall(DBTCPConnector.java:277)
at com.mongodb.DBTCPConnector.call(DBTCPConnector.java:257)
at com.mongodb.DBApiLayer$MyCollection.__find(DBApiLayer.java:310)
at com.mongodb.DBApiLayer$MyCollection.__find(DBApiLayer.java:295)
at com.mongodb.DB.getCollectionNames(DB.java:412)
at Main.Main.main(Main.java:26)
my code is simple (my first time with mongo):
MongoClient Client = new MongoClient( "localhost" , 27017 );
DB db = Client.getDB("qw");
DBCollection coll[] = new DBCollection[4];
Set<String> colls = db.getCollectionNames();
for(String s: colls)
System.out.println(s);
what is the problem?
Possibly you haven't started the Mongo server.
Open a shell and type
mongod
On the file system, you can start it from $MONGO_INSTALL_PATH/bin/mongod.
Don't close the shell and then try to run your code again.
More info:
Manage the mongod process
Try restarting your mongo. I had the same problem, and restarting solved it for me.
You haven't started your MongoDB Server.
First start your mongodb server and then run your code.
Or
You can also create MongoDB service which will always be running in the background, so from next time onwards you don't have to start the MongoDB server.
Here are the steps to create MongoDB service:
Create a folder named ‘log’ parallel to ‘data’ folder, inside mongodb folder.
Copy the ‘mongo.config’ file parallel to log folder inside ‘mongodb’ folder.
Here is the content for your mongo.config file:
stores data here
dbpath = your_drive\mongodb-win32-x86_64-2.2.3\data\db
all output goes here
logpath = your_drive\mongodb-win32-x86_64-2.2.3\log\mongo.log
log read and write operations
diaglog = 3
Create a file MongoServer.bat,
Here is the content for MongoServer.bat
your_drive\mongodb-win32-x86_64-2.2.3\bin\mongod.exe --config "your_drive\mongodb-win32-x86_64-2.2.3\mongo.config"
On your command prompt, go to your mongodb\bin directory and then write this command,
mongod --config your_Drive\mongodb-win32-x86_64-2.2.3\mongo.config –install
This will create the service named as ‘Mongo DB’.
To start the service, type on command prompt
net start MongoDB.
Hence, your service is created. Now you can perform your task.
For further information, you can visit website.
Probably not your problem, but I've seen this Exception raised when mongodb is refusing the connection because it hit a limit on the number of open connections. Check your mongodb log file for a statement like:
"connection refused because too many open connections".
This can mean you're leaving connections open, or you need to raise the limit on number of open files in the db server.
Seems to have the same problem when using the below code to the connection
MongoClient mongo = new MongoClient("localhost", 27017);
But worked out when changed to
MongoClient mongo = new MongoClient("127.0.0.1", 27017);