Open source Kubernetes

• Helm chart
• YugabyteDB operator
• Operator Hub
• Rook operator

Create and manage a YugabyteDB cluster with a Kubernetes native custom resource ybcluster.yugabyte.com. The custom resource definition and other necessary specifications can be found in YugabyteDB operator repository. This operator currently provides more configuration flags as compared to the Rook operator. The Rook operator, in near future, will get these flags too. See full list of configuration flags here.

Prerequisites

Clone the yugabyte-operator repository on your local computer. Change into the cloned directory and follow instructions below.

Deploy a YugabyteDB cluster with this operator

To create a YugabyteDB cluster, first you need to register the custom resource that would represent YugabyteDB cluster: ybclusters.yugabyte.com.

kubectl create -f deploy/crds/yugabyte.com_ybclusters_crd.yaml

Setup RBAC for operator and create the operator itself. Run the following command, from root of the repository, to do the same.

kubectl create -f deploy/operator.yaml

After a few seconds the operator should be up & running. Verify the operator status by running following command.

kubectl -n yb-operator get po,deployment

Finally create an instance of the custom resource with which the operator would create a YugabyteDB cluster.

kubectl create -f deploy/crds/yugabyte.com_v1alpha1_ybcluster_cr.yaml

Verify that the cluster is up and running with the following command. You should see 3 pods each for YB-Master and YB-TServer services.

kubectl get po,sts,svc

Once the cluster is up and running, you may start the YSQL API and start executing relational queries.

kubectl exec -it yb-tserver-0 -- ysqlsh -h yb-tserver-0 --echo-queries

You can also connect to the YCQL API as shown below.

kubectl exec -it yb-tserver-0 -- ycqlsh yb-tserver-0

Configuration flags

Image

Mention YugabyteDB Docker image attributes such as repository, tag and pullPolicy under image.

Replication factor

Specify the required data replication factor. This is a required field.

TLS

Enable TLS encryption for YugabyteDB, if desired. It is disabled by default. You can enable the TLS encryption with 3 flags, explained later. If you have set enabled to true, then you need to generate root certificate and key. Specify the two under rootCA.cert & rootCA.key. Refer to TLS encryption docs (through the Generate root configuration section) for how to generate the certificate and key files.

YB-Master and YB-TServer

YB-Master and YB-TServer are two essential components of a YugabyteDB cluster. YB-Master is responsible for recording and maintaining system metadata and for administration activities. YB-TServer is responsible for data I/O. Specify YB-Master and YB-TServer attributes under master/tserver. The valid attributes are as described below. These two are required fields.

Replicas

Specify count of pods for master & tserver under replicas field. This is a required field.

Network ports

Control network configuration for Master & TServer, each of which support only a selected port attributes. Below table depicts the supported port attributes. Note that these are optional fields, except tserver.tserverUIPort, hence below table also mentions default values for each port. Default network configuration will be used, if any or all of the acceptable fields are absent.

A ClusterIP service will be created when tserver.tserverUIPort port is specified. If it is not specified, only StatefulSet & headless service will be created for TServer. ClusterIP service creation will be skipped. Whereas for Master, all 3 kubernetes objects will always be created.

If master.enableLoadBalancer is set to true, then master UI service will be of type LoadBalancer. TServer UI service will be of type LoadBalancer, if tserver.tserverUIPort is specified and tserver.enableLoadBalancer is set to true. tserver.enableLoadBalancer will be ignored if tserver.tserverUIPort is not specified.

Table depicting acceptable port names, applicable component (Master/TServer) and port default values:

podManagementPolicy

Specify pod management policy for Statefulsets created as part of YugabyteDB cluster. Valid values are Parallel & OrderedReady, Parallel being the default value.

storage

Specify storage configurations viz. Storage count, size & storageClass of volumes. Typically, 1 volume per Master instance is sufficient, hence Master has a default storage count of 1. If storage class isn't specified, it will be defaulted to standard. Make sure kubernetes admin has defined standard storage class, before leaving this field out.

resources

Specify resource requests and limits under resources attribute. The resources to be specified are cpu and memory. The resource property in itself is optional and will not be applied to created StatefulSets, if omitted. You may also choose to specify either resource.requests or resource.limits, or both.

flags

Specify flags for additional control of the YugabyteDB cluster. For available, see YB-Master flags and YB-TServer flags.

If you have enabled TLS encryption, then you can set:

• use_node_to_node_encryption flag to enable node-to-node encryption
• allow_insecure_connections flag to specify if insecure connections are allowed when TLS is enabled
• use_client_to_server_encryption flag to enable client-to-node encryption