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OpsCenter Agents

OpsCenter Agents are now preinstalled with all clusters that are OpsCenter enabled. No longer do you have to enter credentials via the OpsCenter GUI.

Nodelist

If you ever need a list of your Cassandra nodes, simply look at /etc/cassandralauncher/nodelist.

DataStax SSH Client

Now you can simply run the DataStax SSH Client by executing: datastax_ssh. This will connect you to all machines by serially executing your command of choice on all machines in your cluster.

Modified /etc/hosts

Now you can simply run an ssh c0 or ssh a0 command and easily jump from node to node from within your cluster.

A prefix of c is reserved for Cassandra nodes, a for Analytics nodes, and s for Search nodes. The numerical suffix refers to their order within the ring. View /etc/hosts on the node for more details.

DataStax Parallel SSH Client

Now you can simply run the DataStax Parallel SSH Client by executing: datastax_pssh. This will connect you to all machines and executing your command of choice on all machines in your cluster in parallel.

S3 Store and Restore

Now you can use the datastax_s3_store and datastax_s3_restore commands to simply upload and download your cassandra/data directory to and from S3. Think of it as an "experimental EBS functionality for S3."

Note: Do not count on this feature to save important data. This application is only for trivial data in development environments.

The files are stored in s3://datastax_s3_storage-<YOUR_AWS_ACCESS_KEY_ID>/<CLUSTER_NAME>/<NODES_TOKEN> using the ~/.s3cfg file.

Using the datastax_pssh command to store and restore an entire cluster is the recommended way to use this feature.

To automatically preconfigure s3cmd, which datastax_s3_store and datastax_s3_restore rely on, add/change this on your clusterlauncher.conf:

[S3]
send_s3_credentials = True

That will send .s3cfg preconfigured with your aws_access_key_id and aws_secret_access_key, properly set under 400 permissions, to your home directory.