Deploy multi zone on EKS using Helm Chart - Yugabyte Db

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Prerequisites

You must have a Amazon EKS cluster that has Helm configured. Note that Amazon EKS clusters are deployed across multiple zones by default. If you have not installed the Helm client (helm), see Installing Helm.

The YugabyteDB Helm chart has been tested with the following software versions:

Amazon EKS running Kubernetes 1.18 (or later) with nodes such that a total of 12 CPU cores and 45 GB RAM can be allocated to YugabyteDB. This can be three nodes with 4 CPU core and 15 GB RAM allocated to YugabyteDB. m5.2xlarge is the minimum AWS EC2 instance type that meets these criteria.
Helm 3.4 or later
YugabyteDB docker image (yugabytedb/yugabyte) 2.1.0 or later
For optimal performance, ensure you've set the appropriate system limits using ulimit on each node in your Kubernetes cluster.

The following steps show how to meet these prerequisites.

Install and configure the AWS CLI.
Install eksctl

eksctl is a basic command line utility for creating and managing Amazon EKS clusters. Detailed instructions for installing eksctl based on the OS of your choice are available at Getting Started with eksctl. The following instructions apply to macOS.

$ brew tap weaveworks/tap
$ brew install weaveworks/tap/eksctl

Test that your installation was successful.

$ eksctl version

Install and configure kubectl for Amazon EKS

You have multiple options to download and install kubectl for your OS. Note that Amazon EKS also vends kubectl binaries that you can use that are identical to the upstream kubectl binaries with the same version. To install the Amazon EKS-vended binary for your operating system, see Installing kubectl.

Ensure helm is installed

First, check to see if Helm is installed by using the Helm version command.

$ helm version

You should see something similar to the following output. Note that the tiller server side component has been removed in Helm 3.

output

version.BuildInfo{Version:"v3.0.3", GitCommit:"ac925eb7279f4a6955df663a0128044a8a6b7593", GitTreeState:"clean", GoVersion:"go1.13.6"}

1. Create a EKS cluster

Create EKS cluster

Create a EKS cluster, if you have not already done so, by running the following command. Note that if you do not specify 3 zones in the zones parameter explicitly then EKS may place the 3 nodes in only 2 zones.

$ eksctl create cluster \
--name yb-multizone \
--version 1.14 \
--region us-east-1 \
--zones us-east-1a,us-east-1b,us-east-1c \
--nodegroup-name standard-workers \
--node-type m5.2xlarge \
--nodes 3 \
--nodes-min 1 \
--nodes-max 4 \
--managed

As stated in the Prerequisites section, the default configuration in the YugabyteDB Helm Chart requires Kubernetes nodes to have a total of 12 CPU cores and 45 GB RAM allocated to YugabyteDB. This can be three nodes with 4 CPU cores and 15 GB RAM allocated to YugabyteDB. The smallest AWS instance type that meets this requirement is m5.2xlarge which has 8 CPU cores and 32 GB RAM.

Create a storage class

We need to specify WaitForFirstConsumer mode for the volumeBindingMode so that volumes will be provisioned according to pods' zone affinities.

Copy the contents below to a file named storage.yaml.

yaml

kind: StorageClass
metadata:
  name: yb-storage
apiVersion: storage.k8s.io/v1
allowVolumeExpansion: true
provisioner: kubernetes.io/aws-ebs
volumeBindingMode: WaitForFirstConsumer
parameters:
  type: gp2
  fsType: xfs

Apply the above configuration to your cluster.

$ kubectl apply -f storage.yaml

2. Create a YugabyteDB cluster

Add charts repository

To add the YugabyteDB charts repository, run the following command.

$ helm repo add yugabytedb https://charts.yugabyte.com

Make sure that you have the latest updates to the repository by running the following command.

$ helm repo update

Validate that you have the updated chart version.

$ helm search repo yugabytedb/yugabyte --version {{<yb-version version="v2.20" format="short">}}

output

NAME                 CHART VERSION  APP VERSION   DESCRIPTION
yugabytedb/yugabyte  {{<yb-version version="v2.20" format="short">}}          {{<yb-version version="v2.20" format="build">}}  YugabyteDB is the high-performance distributed ...

Create override files

Copy the contents below to a file named overrides-us-east-1a.yaml.

yaml

isMultiAz: True

AZ: us-east-1a

masterAddresses: "yb-master-0.yb-masters.yb-demo-us-east-1a.svc.cluster.local:7100,yb-master-0.yb-masters.yb-demo-us-east-1b.svc.cluster.local:7100,yb-master-0.yb-masters.yb-demo-us-east-1c.svc.cluster.local:7100"

storage:
  master:
    storageClass: "yb-storage"
  tserver:
    storageClass: "yb-storage"

replicas:
  master: 1
  tserver: 1
  totalMasters: 3

gflags:
  master:
    placement_cloud: "aws"
    placement_region: "us-east-1"
    placement_zone: "us-east-1a"
  tserver:
    placement_cloud: "aws"
    placement_region: "us-east-1"
    placement_zone: "us-east-1a"

Copy the contents below to a file named overrides-us-east-1b.yaml.

yaml

isMultiAz: True

AZ: us-east-1b

masterAddresses: "yb-master-0.yb-masters.yb-demo-us-east-1a.svc.cluster.local:7100,yb-master-0.yb-masters.yb-demo-us-east-1b.svc.cluster.local:7100,yb-master-0.yb-masters.yb-demo-us-east-1c.svc.cluster.local:7100"

storage:
  master:
    storageClass: "yb-storage"
  tserver:
    storageClass: "yb-storage"

replicas:
  master: 1
  tserver: 1
  totalMasters: 3

gflags:
  master:
    placement_cloud: "aws"
    placement_region: "us-east-1"
    placement_zone: "us-east-1b"
  tserver:
    placement_cloud: "aws"
    placement_region: "us-east-1"
    placement_zone: "us-east-1b"

Copy the contents below to a file named overrides-us-east-1c.yaml.

yaml

isMultiAz: True

AZ: us-east-1c

masterAddresses: "yb-master-0.yb-masters.yb-demo-us-east-1a.svc.cluster.local:7100,yb-master-0.yb-masters.yb-demo-us-east-1b.svc.cluster.local:7100,yb-master-0.yb-masters.yb-demo-us-east-1c.svc.cluster.local:7100"

storage:
  master:
    storageClass: "yb-storage"
  tserver:
    storageClass: "yb-storage"

replicas:
  master: 1
  tserver: 1
  totalMasters: 3

gflags:
  master:
    placement_cloud: "aws"
    placement_region: "us-east-1"
    placement_zone: "us-east-1c"
  tserver:
    placement_cloud: "aws"
    placement_region: "us-east-1"
    placement_zone: "us-east-1c"

Install YugabyteDB

Install YugabyteDB in the Kubernetes cluster using the commands below.

For Helm, you have to first create the 3 namespaces.

$ kubectl create namespace yb-demo-us-east-1a
$ kubectl create namespace yb-demo-us-east-1b
$ kubectl create namespace yb-demo-us-east-1c

Now create the overall YugabyteDB cluster in such a way that one third of the nodes are hosted in each zone.

$ helm install yb-demo-us-east-1a yugabytedb/yugabyte \
 --version {{<yb-version version="v2.20" format="short">}} \
 --namespace yb-demo-us-east-1a \
 -f overrides-us-east-1a.yaml --wait

$ helm install yb-demo-us-east-1b yugabytedb/yugabyte \
 --version {{<yb-version version="v2.20" format="short">}} \
 --namespace yb-demo-us-east-1b \
 -f overrides-us-east-1b.yaml --wait

$ helm install yb-demo-us-east-1c yugabytedb/yugabyte \
 --version {{<yb-version version="v2.20" format="short">}} \
 --namespace yb-demo-us-east-1c \
 -f overrides-us-east-1c.yaml --wait

3. Check the cluster status

You can check the status of the cluster using various commands noted below.

Check the pods.

$ kubectl get pods --all-namespaces

Check the services.

$ kubectl get services --all-namespaces

output

NAMESPACE            NAME                 TYPE           CLUSTER-IP       EXTERNAL-IP                                                               PORT(S)                                        AGE
default              kubernetes           ClusterIP      10.100.0.1       <none>                                                                    443/TCP                                        20m
kube-system          kube-dns             ClusterIP      10.100.0.10      <none>                                                                    53/UDP,53/TCP                                  20m
yb-demo-us-east-1a   yb-master-ui         LoadBalancer   10.100.189.217   ad37cdc4667de11ea87920e8fdeea06a-261093161.us-east-1.elb.amazonaws.com    7000:31087/TCP                                 5m12s
yb-demo-us-east-1a   yb-masters           ClusterIP      None             <none>                                                                    7100/TCP,7000/TCP                              5m12s
yb-demo-us-east-1a   yb-tserver-service   LoadBalancer   10.100.97.195    ad37e06fb67de11ea87920e8fdeea06a-238172614.us-east-1.elb.amazonaws.com    6379:30334/TCP,9042:31406/TCP,5433:30024/TCP   5m12s
yb-demo-us-east-1a   yb-tservers          ClusterIP      None             <none>                                                                    7100/TCP,9000/TCP,6379/TCP,9042/TCP,5433/TCP   5m12s
yb-demo-us-east-1b   yb-master-ui         LoadBalancer   10.100.61.215    a2348e9ce67df11ea9fec12feeb58bc1-1248396869.us-east-1.elb.amazonaws.com   7000:31595/TCP                                 2m58s
yb-demo-us-east-1b   yb-masters           ClusterIP      None             <none>                                                                    7100/TCP,7000/TCP                              2m58s
yb-demo-us-east-1b   yb-tserver-service   LoadBalancer   10.100.99.202    a2347e74f67df11ea9fec12feeb58bc1-1599278236.us-east-1.elb.amazonaws.com   6379:31292/TCP,9042:30275/TCP,5433:30450/TCP   2m58s
yb-demo-us-east-1b   yb-tservers          ClusterIP      None             <none>                                                                    7100/TCP,9000/TCP,6379/TCP,9042/TCP,5433/TCP   2m58s
yb-demo-us-east-1c   yb-master-ui         LoadBalancer   10.100.0.232     a6cd5518167df11ea9fec12feeb58bc1-1402605575.us-east-1.elb.amazonaws.com   7000:31678/TCP                                 55s
yb-demo-us-east-1c   yb-masters           ClusterIP      None             <none>                                                                    7100/TCP,7000/TCP                              55s
yb-demo-us-east-1c   yb-tserver-service   LoadBalancer   10.100.119.40    a6cd628b667df11ea9fec12feeb58bc1-403831649.us-east-1.elb.amazonaws.com    6379:31544/TCP,9042:31541/TCP,5433:32374/TCP   55s
yb-demo-us-east-1c   yb-tservers          ClusterIP      None             <none>                                                                    7100/TCP,9000/TCP,6379/TCP,9042/TCP,5433/TCP   55s

Access the yb-master Admin UI for the cluster at http://<external-ip>:7000 where external-ip refers to one of the yb-master-ui services. Note that you can use any of the above three services for this purpose as all of them will show the same cluster metadata.

4. Configure zone-aware replica placement

Default replica placement policy treats every yb-tserver as equal irrespective of its placement_* setting. Go to http://<external-ip>:7000/cluster-config to confirm that the default configuration is still in effect.

To make the replica placement zone-aware, so that one replica is placed in each zone, run the following command:

$ kubectl exec -it -n yb-demo-us-east-1a yb-master-0 -- bash \
-c "/home/yugabyte/master/bin/yb-admin --master_addresses yb-master-0.yb-masters.yb-demo-us-east-1a.svc.cluster.local:7100,yb-master-0.yb-masters.yb-demo-us-east-1b.svc.cluster.local:7100,yb-master-0.yb-masters.yb-demo-us-east-1c.svc.cluster.local:7100 modify_placement_info aws.us-east-1.us-east-1a,aws.us-east-1.us-east-1b,aws.us-east-1.us-east-1c 3"

To see the new configuration, go to http://<external-ip>:7000/cluster-config.

5. Connect using YugabyteDB shells

To connect and use the YSQL Shell (ysqlsh), run the following command:

$ kubectl exec -n yb-demo-us-east-1a -it yb-tserver-0 -- ysqlsh \
  -h yb-tserver-0.yb-tservers.yb-demo-us-east-1a

To connect and use the YCQL Shell (ycqlsh), run the following command:

$ kubectl exec -n yb-demo-us-east-1a -it yb-tserver-0 -- ycqlsh \
yb-tserver-0.yb-tservers.yb-demo-us-east-1a

You can follow the Explore YSQL tutorial and then go to the http://<external-ip>:7000/tablet-servers page of the yb-master Admin UI to confirm that tablet peers and their leaders are placed evenly across all three zones for both user data and system data.

6. Connect using external clients

To connect an external program, get the load balancer EXTERNAL-IP address of the yb-tserver-service service and connect using port 5433 for YSQL or port 9042 for YCQL, as follows:

$ kubectl get services --namespace yb-demo

output

NAME                 TYPE           CLUSTER-IP      EXTERNAL-IP   PORT(S)                                        AGE
...
yb-demo-us-east-1a   yb-tserver-service   LoadBalancer   10.100.97.195    ad37e06fb67de11ea87920e8fdeea06a-238172614.us-east-1.elb.amazonaws.com    6379:30334/TCP,9042:31406/TCP,5433:30024/TCP   5m12s
...