ScyllaDB Docs ScyllaDB Open Source ScyllaDB for Administrators Procedures Cluster Management Procedures Create a ScyllaDB Cluster on EC2 (Single or Multi Data Center)

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Create a ScyllaDB Cluster on EC2 (Single or Multi Data Center)¶

The easiest way to run a ScyllaDB cluster on EC2 is by using ScyllaDB AMI, which is Ubuntu-based. To use a different OS or your own AMI (Amazon Machine Image) or set up a multi DC ScyllaDB cluster, you need to configure the ScyllaDB cluster on your own. This page guides you through this process.

A ScyllaDB cluster on EC2 can be deployed as a single-DC cluster or a multi-DC cluster. The table below describes how to configure parameters in the scylla.yaml file for each node in your cluster for both cluster types.

For more information on ScyllaDB AMI and the configuration of parameters in scylla.yaml from the EC2 user data, see ScyllaDB Machine Image.

The best practice is to use each EC2 region as a ScyllaDB DC. In such a case, nodes communicate using Internal (Private) IPs inside the region and using External (Public) IPs between regions (Data Centers).

For further information, see AWS instance addressing.

EC2 Configuration Table¶

Parameter	Single DC	Multi DC
seeds	Internal IP address	External IP address
listen_address	Internal IP address	Internal IP address
rpc_address	Internal IP address	Internal IP address
broadcast_address	Internal IP address	External IP address
broadcast_rpc_address	Internal IP address	External IP address
endpoint_snitch	Ec2Snitch	Ec2MultiRegionSnitch

Prerequisites¶

EC2 instance with SSH access.
Ensure that all the relevant ports are open in your EC2 Security Group.
Select a unique name as cluster_name for the cluster (identical for all the nodes in the cluster).
Choose one of the nodes to be a seed node. You’ll need to provide the IP of that node using the seeds parameter in the scylla.yaml configuration file on each node.

Procedure¶

Install ScyllaDB on the nodes you want to add to the cluster. See Getting Started for installation instructions and follow the procedure up to the scylla.yaml configuration phase.

If the ScyllaDB service is already running (for example, if you are using ScyllaDB AMI), stop it before moving to the next step by using these instructions.
On each node, edit the scylla.yaml file in /etc/scylla/ to configure the parameters listed below. See the EC2 Configuration Table above on how to configure your cluster.
- cluster_name - Set the selected cluster_name.
- seeds - Specify the IP of the node you chose to be a seed node. See ScyllaDB Seed Nodes for details.
- listen_address - IP address that ScyllaDB used to connect to other ScyllaDB nodes in the cluster.
- endpoint_snitch - Set the selected snitch.
- rpc_address - Address for CQL client connection.
- broadcast_address - The IP address a node tells other nodes in the cluster to contact it by.
- broadcast_rpc_address - Default: unset. The RPC address to broadcast to drivers and other ScyllaDB nodes. It cannot be set to 0.0.0.0. If left blank, it will be set to the value of rpc_address. If rpc_address is set to 0.0.0.0, broadcast_rpc_address must be explicitly configured.

Start the nodes.

sudo systemctl start scylla-server

docker exec -it some-scylla supervisorctl start scylla

(with some-scylla container already running)

Verify that the node has been added to the cluster using nodetool status.

EC2snitch’s Default DC and Rack Names, and how to Override DC Names¶

EC2snitch and Ec2MultiRegionSnitch give each DC and rack default names. The region name is defined as the datacenter name, and availability zones are defined as racks within a datacenter. The rack names cannot be changed.

Example¶

For a node in the us-east-1 region, us-east is the datacenter name and 1 is the rack.

To change the name of the datacenter, open the cassandra-rackdc.properties file located in /etc/scylla/ and edit the DC name.

The dc_suffix defines a suffix added to the datacenter name. For example:

for region us-east and suffix dc_suffix=_1_scylla, it will be us-east_1_scylla.
for region us-west and suffix dc_suffix=_1_scylla, it will be us-west_1_scylla.

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