We have Datastax Enterprise installed in a Rackspace Cloud Instance.
We configured a Test Cluster with a first node with no problem. Then we created a new instance in the Rackspace Cloud and installed same and last Datastax version.
But when trying to build a second node in the cluster it returns the following error:
(1) Error: Installation stage failed: The following packages are already installed: dse-full, dse-pig, dse-libpig, dse-libsolr, dse-libtomcat, dse-libsqoop, dse-liblog4j, dse-libmahout, dse-demos, dse-hive, dse-libhive, dse, dse-libhadoop-native, dse-libhadoop, dse-libcassandra
To try to solve the problem, we deleted the packages and we try to add the new node again to the cluster.
Installation script runs, we get this error:
(2) Installed Errored: The installed agent doesn't seem to be responding.
If we review the Activity Console of the new node (server), it seems the Opscenter Agent is running, but we get the same above error (2).
OpsCenter determines whether an agent has come up based on its ability to ping the /alive route of the agent's http API, which runs by default on port 61621. If you change the log level in opscenterd.conf, you will see the http request being made (It starts with "Performing HTTP request"). You'll want to ensure the IP and port used in that request are accessible from the opscenterd machine.
If they are, you'll want to verify the agent is running properly, and check the agent.log for any errors.
As a last resort, you can try uninstalling the agent as well before attempting to add the node again.