keyspace and tables not replicating across data centre in cassandra - cassandra

Question

I am trying to create cassandra cluster. For that I have a single node data centres
One data center is named DC1 and the other is DC2. Hence there are 2 single node data center. I followed the steps given here
http://docs.datastax.com/en/cassandra/2.0/cassandra/initialize/initializeMultipleDS.html
Since I have single node data center, so my seed will be a single machine. I can do ndoetool -h status to both the machines. I created a keyspace like this
CREATE KEYSPACE sams WITH replication = {'class': 'NetworkTopologyStrategy', 'DC1': '1', 'DC2': '1'} AND durable_writes = true;
and a table like
CREATE TABLE apikey ( appname text, appkey text, PRIMARY KEY ((appname), appkey) );
I create keyspace and table in one data centre. This should get replicated on the other machine but it does not replicate. There are no keyspaces shown on the other data center neither any tables.
What am I missing here?
Adding nodetool output
nodetool -h cassandra1 status
Datacenter: DC1
===============
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
-- Address Load Tokens Owns (effective) Host ID Rack
UN 100.117.100.107 178.28 KB 256 100.0% 0c5da294-2a86-472d-98ec-857ed5140417 RAC1
nodetool -h cassandra2 status
Datacenter: DC2
===============
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
-- Address Load Tokens Owns Host ID Rack
UN 100.117.150.55 162.94 KB 256 ? 9f3e49f6-debc-4a9c-ba93-bc65b3851a48 RAC1

Answer 1

It looks like you have accidentally set up two independent clusters rather than a single cluster that spans two data centers.
Make sure in cassandra.yaml that both nodes have the same cluster_name and that both have the same list of ip's for "- seeds:". Since you only have two nodes, I'd list both ip's as the seeds rather than just one.
If the nodes have joined the same cluster, then it should show both of them when you run nodetool status.