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Create a ScyllaDB Cluster - Single Datacenter (DC)¶
Prerequisites¶
Make sure that all the ports are open.
Obtain the IP addresses of all nodes that have been created for 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.
Select a unique name as
cluster_namefor the cluster (identical for all the nodes in the cluster).Choose which snitch to use (identical for all the nodes in the cluster). For a production system, it is recommended to use a DC-aware snitch, which can support the
NetworkTopologyStrategyreplication strategy for your keyspaces.
Procedure¶
1. Install ScyllaDB on the nodes you want to add to the cluster. See Getting Started for further instructions.
Follow the ScyllaDB install procedure up to scylla.yaml configuration phase.
In case the node starts during the process, follow these instructions
2. On each node, edit the scylla.yaml file to configure the parameters listed below.
The file can be found under /etc/scylla/.
cluster_name - Set the selected cluster_name
seeds - Specify the IP of the node you chose to be a seed node. New nodes will use the IP of this seed node to connect to the cluster and learn the cluster topology and state.
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
3. This step needs to be done only if you are using the GossipingPropertyFileSnitch. If not, skip this step.
In the cassandra-rackdc.properties file, edit the parameters listed below.
The file can be found under /etc/scylla/
dc - Set the datacenter name
rack - Set the rack name
For example:
# cassandra-rackdc.properties
#
# The lines may include white spaces at the beginning and the end.
# The rack and data center names may also include white spaces.
# All trailing and leading white spaces will be trimmed.
#
dc=thedatacentername
rack=therackname
# prefer_local=<false | true>
# dc_suffix=<Data Center name suffix, used by EC2SnitchXXX snitches>
Start the nodes.
sudo systemctl start scylla-server
docker exec -it some-scylla supervisorctl start scylla
(with some-scylla container already running)
5. Verify that the nodes have been added to the cluster using
nodetool status.
Example¶
This example shows how to install and configure a three-node cluster using GossipingPropertyFileSnitch as the endpoint_snitch, each node on a different rack.
Install three ScyllaDB nodes; the IPs are:
192.168.1.201 (seed)
192.168.1.202
192.168.1.203
In each ScyllaDB node, edit the
scylla.yamlfile
192.168.1.201
cluster_name: 'Scylla_cluster_demo'
seeds: "192.168.1.201"
endpoint_snitch: GossipingPropertyFileSnitch
rpc_address: "192.168.1.201"
listen_address: "192.168.1.201"
192.168.1.202
cluster_name: 'Scylla_cluster_demo'
seeds: "192.168.1.201"
endpoint_snitch: GossipingPropertyFileSnitch
rpc_address: "192.168.1.202"
listen_address: "192.168.1.202"
192.168.1.203
cluster_name: 'Scylla_cluster_demo'
seeds: "192.168.1.201"
endpoint_snitch: GossipingPropertyFileSnitch
rpc_address: "192.168.1.203"
listen_address: "192.168.1.203"
This step only needs to be done if you’re using GossipingPropertyFileSnitch. In each ScyllaDB node, edit the
cassandra-rackdc.propertiesfile.
192.168.1.201
# cassandra-rackdc.properties
#
# The lines may include white spaces at the beginning and the end.
# The rack and data center names may also include white spaces.
# All trailing and leading white spaces will be trimmed.
#
dc=datacenter1
rack=rack43
# prefer_local=<false | true>
# dc_suffix=<Data Center name suffix, used by EC2SnitchXXX snitches>
192.168.1.202
# cassandra-rackdc.properties
#
# The lines may include white spaces at the beginning and the end.
# The rack and data center names may also include white spaces.
# All trailing and leading white spaces will be trimmed.
#
dc=datacenter1
rack=rack44
# prefer_local=<false | true>
# dc_suffix=<Data Center name suffix, used by EC2SnitchXXX snitches>
192.168.1.203
# cassandra-rackdc.properties
#
# The lines may include white spaces at the beginning and the end.
# The rack and data center names may also include white spaces.
# All trailing and leading white spaces will be trimmed.
#
dc=datacenter1
rack=rack45
# prefer_local=<false | true>
# dc_suffix=<Data Center name suffix, used by EC2SnitchXXX snitches>
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 nodes have been added to the cluster by using the
nodetool statuscommand.
Datacenter: datacenter1
Status=Up/Down
State=Normal/Leaving/Joining/Moving
-- Address Load Tokens Owns (effective) Host ID Rack
UN 192.168.1.201 112.82 KB 256 32.7% 8d5ed9f4-7764-4dbd-bad8-43fddce94b7c 43
UN 192.168.1.202 91.11 KB 256 32.9% 125ed9f4-7777-1dbn-mac8-43fddce9123e 44
UN 192.168.1.203 124.42 KB 256 32.6% 675ed9f4-6564-6dbd-can8-43fddce952gy 45