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Horizontal Scale MongoDB Replicaset
This guide will show you how to use KubeDB Ops-manager operator to scale the replicaset of a MongoDB database.
Before You Begin
At first, you need to have a Kubernetes cluster, and the
kubectlcommand-line tool must be configured to communicate with your cluster. If you do not already have a cluster, you can create one by using kind.Install
KubeDBProvisioner and Ops-manager operator in your cluster following the steps here.You should be familiar with the following
KubeDBconcepts:
To keep everything isolated, we are going to use a separate namespace called demo throughout this tutorial.
$ kubectl create ns demo
namespace/demo created
Note: YAML files used in this tutorial are stored in docs/examples/mongodb directory of kubedb/docs repository.
Apply Horizontal Scaling on Replicaset
Here, we are going to deploy a MongoDB replicaset using a supported version by KubeDB operator. Then we are going to apply horizontal scaling on it.
Prepare MongoDB Replicaset Database
Now, we are going to deploy a MongoDB replicaset database with version 4.2.3.
Deploy MongoDB replicaset
In this section, we are going to deploy a MongoDB replicaset database. Then, in the next section we will scale the database using MongoDBOpsRequest CRD. Below is the YAML of the MongoDB CR that we are going to create,
apiVersion: kubedb.com/v1alpha2
kind: MongoDB
metadata:
name: mg-replicaset
namespace: demo
spec:
version: "4.2.3"
replicaSet:
name: "replicaset"
replicas: 3
storageType: Durable
storage:
storageClassName: "standard"
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi
Let’s create the MongoDB CR we have shown above,
$ kubectl create -f https://github.com/kubedb/docs/raw/v2023.08.18/docs/examples/mongodb/scaling/mg-replicaset.yaml
mongodb.kubedb.com/mg-replicaset created
Now, wait until mg-replicaset has status Ready. i.e,
$ kubectl get mg -n demo
NAME VERSION STATUS AGE
mg-replicaset 4.2.3 Ready 2m36s
Let’s check the number of replicas this database has from the MongoDB object, number of pods the statefulset have,
$ kubectl get mongodb -n demo mg-replicaset -o json | jq '.spec.replicas'
3
$ kubectl get sts -n demo mg-replicaset -o json | jq '.spec.replicas'
3
We can see from both command that the database has 3 replicas in the replicaset.
Also, we can verify the replicas of the replicaset from an internal mongodb command by execing into a replica.
First we need to get the username and password to connect to a mongodb instance,
$ kubectl get secrets -n demo mg-replicaset-auth -o jsonpath='{.data.\username}' | base64 -d
root
$ kubectl get secrets -n demo mg-replicaset-auth -o jsonpath='{.data.\password}' | base64 -d
nrKuxni0wDSMrgwy
Now let’s connect to a mongodb instance and run a mongodb internal command to check the number of replicas,
$ kubectl exec -n demo mg-replicaset-0 -- mongo admin -u root -p nrKuxni0wDSMrgwy --eval "db.adminCommand( { replSetGetStatus : 1 } ).members" --quiet
[
{
"_id" : 0,
"name" : "mg-replicaset-0.mg-replicaset-pods.demo.svc.cluster.local:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 171,
"optime" : {
"ts" : Timestamp(1614698544, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2021-03-02T15:22:24Z"),
"syncingTo" : "",
"syncSourceHost" : "",
"syncSourceId" : -1,
"infoMessage" : "",
"electionTime" : Timestamp(1614698393, 2),
"electionDate" : ISODate("2021-03-02T15:19:53Z"),
"configVersion" : 3,
"self" : true,
"lastHeartbeatMessage" : ""
},
{
"_id" : 1,
"name" : "mg-replicaset-1.mg-replicaset-pods.demo.svc.cluster.local:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 128,
"optime" : {
"ts" : Timestamp(1614698544, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1614698544, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2021-03-02T15:22:24Z"),
"optimeDurableDate" : ISODate("2021-03-02T15:22:24Z"),
"lastHeartbeat" : ISODate("2021-03-02T15:22:32.411Z"),
"lastHeartbeatRecv" : ISODate("2021-03-02T15:22:31.543Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "",
"syncingTo" : "mg-replicaset-0.mg-replicaset-pods.demo.svc.cluster.local:27017",
"syncSourceHost" : "mg-replicaset-0.mg-replicaset-pods.demo.svc.cluster.local:27017",
"syncSourceId" : 0,
"infoMessage" : "",
"configVersion" : 3
},
{
"_id" : 2,
"name" : "mg-replicaset-2.mg-replicaset-pods.demo.svc.cluster.local:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 83,
"optime" : {
"ts" : Timestamp(1614698544, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1614698544, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2021-03-02T15:22:24Z"),
"optimeDurableDate" : ISODate("2021-03-02T15:22:24Z"),
"lastHeartbeat" : ISODate("2021-03-02T15:22:30.615Z"),
"lastHeartbeatRecv" : ISODate("2021-03-02T15:22:31.543Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "",
"syncingTo" : "mg-replicaset-0.mg-replicaset-pods.demo.svc.cluster.local:27017",
"syncSourceHost" : "mg-replicaset-0.mg-replicaset-pods.demo.svc.cluster.local:27017",
"syncSourceId" : 0,
"infoMessage" : "",
"configVersion" : 3
}
]
We can see from the above output that the replicaset has 3 nodes.
We are now ready to apply the MongoDBOpsRequest CR to scale this database.
Scale Up Replicas
Here, we are going to scale up the replicas of the replicaset to meet the desired number of replicas after scaling.
Create MongoDBOpsRequest
In order to scale up the replicas of the replicaset of the database, we have to create a MongoDBOpsRequest CR with our desired replicas. Below is the YAML of the MongoDBOpsRequest CR that we are going to create,
apiVersion: ops.kubedb.com/v1alpha1
kind: MongoDBOpsRequest
metadata:
name: mops-hscale-up-replicaset
namespace: demo
spec:
type: HorizontalScaling
databaseRef:
name: mg-replicaset
horizontalScaling:
replicas: 4
Here,
spec.databaseRef.namespecifies that we are performing horizontal scaling operation onmops-hscale-up-replicasetdatabase.spec.typespecifies that we are performingHorizontalScalingon our database.spec.horizontalScaling.replicasspecifies the desired replicas after scaling.
Let’s create the MongoDBOpsRequest CR we have shown above,
$ kubectl apply -f https://github.com/kubedb/docs/raw/v2023.08.18/docs/examples/mongodb/scaling/horizontal-scaling/mops-hscale-up-replicaset.yaml
mongodbopsrequest.ops.kubedb.com/mops-hscale-up-replicaset created
Verify Replicaset replicas scaled up successfully
If everything goes well, KubeDB Ops-manager operator will update the replicas of MongoDB object and related StatefulSets and Pods.
Let’s wait for MongoDBOpsRequest to be Successful. Run the following command to watch MongoDBOpsRequest CR,
$ watch kubectl get mongodbopsrequest -n demo
Every 2.0s: kubectl get mongodbopsrequest -n demo
NAME TYPE STATUS AGE
mops-hscale-up-replicaset HorizontalScaling Successful 106s
We can see from the above output that the MongoDBOpsRequest has succeeded. If we describe the MongoDBOpsRequest we will get an overview of the steps that were followed to scale the database.
$ kubectl describe mongodbopsrequest -n demo mops-hscale-up-replicaset
Name: mops-hscale-up-replicaset
Namespace: demo
Labels: <none>
Annotations: <none>
API Version: ops.kubedb.com/v1alpha1
Kind: MongoDBOpsRequest
Metadata:
Creation Timestamp: 2021-03-02T15:23:14Z
Generation: 1
Managed Fields:
API Version: ops.kubedb.com/v1alpha1
Fields Type: FieldsV1
fieldsV1:
f:metadata:
f:annotations:
.:
f:kubectl.kubernetes.io/last-applied-configuration:
f:spec:
.:
f:databaseRef:
.:
f:name:
f:horizontalScaling:
.:
f:replicas:
f:type:
Manager: kubectl-client-side-apply
Operation: Update
Time: 2021-03-02T15:23:14Z
API Version: ops.kubedb.com/v1alpha1
Fields Type: FieldsV1
fieldsV1:
f:status:
.:
f:conditions:
f:observedGeneration:
f:phase:
Manager: kubedb-enterprise
Operation: Update
Time: 2021-03-02T15:23:14Z
Resource Version: 129882
Self Link: /apis/ops.kubedb.com/v1alpha1/namespaces/demo/mongodbopsrequests/mops-hscale-up-replicaset
UID: e97dac5c-5e3a-4153-9b31-8ba02af54bcb
Spec:
Database Ref:
Name: mg-replicaset
Horizontal Scaling:
Replicas: 4
Type: HorizontalScaling
Status:
Conditions:
Last Transition Time: 2021-03-02T15:23:14Z
Message: MongoDB ops request is horizontally scaling database
Observed Generation: 1
Reason: HorizontalScaling
Status: True
Type: HorizontalScaling
Last Transition Time: 2021-03-02T15:24:00Z
Message: Successfully Horizontally Scaled Up ReplicaSet
Observed Generation: 1
Reason: ScaleUpReplicaSet
Status: True
Type: ScaleUpReplicaSet
Last Transition Time: 2021-03-02T15:24:00Z
Message: Successfully Horizontally Scaled MongoDB
Observed Generation: 1
Reason: Successful
Status: True
Type: Successful
Observed Generation: 1
Phase: Successful
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal PauseDatabase 91s KubeDB Ops-manager operator Pausing MongoDB demo/mg-replicaset
Normal PauseDatabase 91s KubeDB Ops-manager operator Successfully paused MongoDB demo/mg-replicaset
Normal ScaleUpReplicaSet 45s KubeDB Ops-manager operator Successfully Horizontally Scaled Up ReplicaSet
Normal ResumeDatabase 45s KubeDB Ops-manager operator Resuming MongoDB demo/mg-replicaset
Normal ResumeDatabase 45s KubeDB Ops-manager operator Successfully resumed MongoDB demo/mg-replicaset
Normal Successful 45s KubeDB Ops-manager operator Successfully Horizontally Scaled Database
Now, we are going to verify the number of replicas this database has from the MongoDB object, number of pods the statefulset have,
$ kubectl get mongodb -n demo mg-replicaset -o json | jq '.spec.replicas'
4
$ kubectl get sts -n demo mg-replicaset -o json | jq '.spec.replicas'
4
Now let’s connect to a mongodb instance and run a mongodb internal command to check the number of replicas,
$ kubectl exec -n demo mg-replicaset-0 -- mongo admin -u root -p nrKuxni0wDSMrgwy --eval "db.adminCommand( { replSetGetStatus : 1 } ).members" --quiet
[
{
"_id" : 0,
"name" : "mg-replicaset-0.mg-replicaset-pods.demo.svc.cluster.local:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 344,
"optime" : {
"ts" : Timestamp(1614698724, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2021-03-02T15:25:24Z"),
"syncingTo" : "",
"syncSourceHost" : "",
"syncSourceId" : -1,
"infoMessage" : "",
"electionTime" : Timestamp(1614698393, 2),
"electionDate" : ISODate("2021-03-02T15:19:53Z"),
"configVersion" : 4,
"self" : true,
"lastHeartbeatMessage" : ""
},
{
"_id" : 1,
"name" : "mg-replicaset-1.mg-replicaset-pods.demo.svc.cluster.local:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 301,
"optime" : {
"ts" : Timestamp(1614698712, 2),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1614698712, 2),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2021-03-02T15:25:12Z"),
"optimeDurableDate" : ISODate("2021-03-02T15:25:12Z"),
"lastHeartbeat" : ISODate("2021-03-02T15:25:23.889Z"),
"lastHeartbeatRecv" : ISODate("2021-03-02T15:25:25.179Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "",
"syncingTo" : "mg-replicaset-0.mg-replicaset-pods.demo.svc.cluster.local:27017",
"syncSourceHost" : "mg-replicaset-0.mg-replicaset-pods.demo.svc.cluster.local:27017",
"syncSourceId" : 0,
"infoMessage" : "",
"configVersion" : 4
},
{
"_id" : 2,
"name" : "mg-replicaset-2.mg-replicaset-pods.demo.svc.cluster.local:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 256,
"optime" : {
"ts" : Timestamp(1614698712, 2),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1614698712, 2),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2021-03-02T15:25:12Z"),
"optimeDurableDate" : ISODate("2021-03-02T15:25:12Z"),
"lastHeartbeat" : ISODate("2021-03-02T15:25:23.888Z"),
"lastHeartbeatRecv" : ISODate("2021-03-02T15:25:25.136Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "",
"syncingTo" : "mg-replicaset-0.mg-replicaset-pods.demo.svc.cluster.local:27017",
"syncSourceHost" : "mg-replicaset-0.mg-replicaset-pods.demo.svc.cluster.local:27017",
"syncSourceId" : 0,
"infoMessage" : "",
"configVersion" : 4
},
{
"_id" : 3,
"name" : "mg-replicaset-3.mg-replicaset-pods.demo.svc.cluster.local:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 93,
"optime" : {
"ts" : Timestamp(1614698712, 2),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1614698712, 2),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2021-03-02T15:25:12Z"),
"optimeDurableDate" : ISODate("2021-03-02T15:25:12Z"),
"lastHeartbeat" : ISODate("2021-03-02T15:25:23.926Z"),
"lastHeartbeatRecv" : ISODate("2021-03-02T15:25:24.089Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "",
"syncingTo" : "mg-replicaset-0.mg-replicaset-pods.demo.svc.cluster.local:27017",
"syncSourceHost" : "mg-replicaset-0.mg-replicaset-pods.demo.svc.cluster.local:27017",
"syncSourceId" : 0,
"infoMessage" : "",
"configVersion" : 4
}
]
From all the above outputs we can see that the replicas of the replicaset is 4. That means we have successfully scaled up the replicas of the MongoDB replicaset.
Scale Down Replicas
Here, we are going to scale down the replicas of the replicaset to meet the desired number of replicas after scaling.
Create MongoDBOpsRequest
In order to scale down the replicas of the replicaset of the database, we have to create a MongoDBOpsRequest CR with our desired replicas. Below is the YAML of the MongoDBOpsRequest CR that we are going to create,
apiVersion: ops.kubedb.com/v1alpha1
kind: MongoDBOpsRequest
metadata:
name: mops-hscale-down-replicaset
namespace: demo
spec:
type: HorizontalScaling
databaseRef:
name: mg-replicaset
horizontalScaling:
replicas: 3
Here,
spec.databaseRef.namespecifies that we are performing horizontal scaling down operation onmops-hscale-down-replicasetdatabase.spec.typespecifies that we are performingHorizontalScalingon our database.spec.horizontalScaling.replicasspecifies the desired replicas after scaling.
Let’s create the MongoDBOpsRequest CR we have shown above,
$ kubectl apply -f https://github.com/kubedb/docs/raw/v2023.08.18/docs/examples/mongodb/scaling/horizontal-scaling/mops-hscale-down-replicaset.yaml
mongodbopsrequest.ops.kubedb.com/mops-hscale-down-replicaset created
Verify Replicaset replicas scaled down successfully
If everything goes well, KubeDB Ops-manager operator will update the replicas of MongoDB object and related StatefulSets and Pods.
Let’s wait for MongoDBOpsRequest to be Successful. Run the following command to watch MongoDBOpsRequest CR,
$ watch kubectl get mongodbopsrequest -n demo
Every 2.0s: kubectl get mongodbopsrequest -n demo
NAME TYPE STATUS AGE
mops-hscale-down-replicaset HorizontalScaling Successful 2m32s
We can see from the above output that the MongoDBOpsRequest has succeeded. If we describe the MongoDBOpsRequest we will get an overview of the steps that were followed to scale the database.
$ kubectl describe mongodbopsrequest -n demo mops-hscale-down-replicaset
Name: mops-hscale-down-replicaset
Namespace: demo
Labels: <none>
Annotations: <none>
API Version: ops.kubedb.com/v1alpha1
Kind: MongoDBOpsRequest
Metadata:
Creation Timestamp: 2021-03-02T15:25:57Z
Generation: 1
Managed Fields:
API Version: ops.kubedb.com/v1alpha1
Fields Type: FieldsV1
fieldsV1:
f:metadata:
f:annotations:
.:
f:kubectl.kubernetes.io/last-applied-configuration:
f:spec:
.:
f:databaseRef:
.:
f:name:
f:horizontalScaling:
.:
f:replicas:
f:type:
Manager: kubectl-client-side-apply
Operation: Update
Time: 2021-03-02T15:25:57Z
API Version: ops.kubedb.com/v1alpha1
Fields Type: FieldsV1
fieldsV1:
f:status:
.:
f:conditions:
f:observedGeneration:
f:phase:
Manager: kubedb-enterprise
Operation: Update
Time: 2021-03-02T15:25:57Z
Resource Version: 130393
Self Link: /apis/ops.kubedb.com/v1alpha1/namespaces/demo/mongodbopsrequests/mops-hscale-down-replicaset
UID: fbfee7f8-1dd5-4f58-aad7-ad2e2d66b295
Spec:
Database Ref:
Name: mg-replicaset
Horizontal Scaling:
Replicas: 3
Type: HorizontalScaling
Status:
Conditions:
Last Transition Time: 2021-03-02T15:25:57Z
Message: MongoDB ops request is horizontally scaling database
Observed Generation: 1
Reason: HorizontalScaling
Status: True
Type: HorizontalScaling
Last Transition Time: 2021-03-02T15:26:17Z
Message: Successfully Horizontally Scaled Down ReplicaSet
Observed Generation: 1
Reason: ScaleDownReplicaSet
Status: True
Type: ScaleDownReplicaSet
Last Transition Time: 2021-03-02T15:26:17Z
Message: Successfully Horizontally Scaled MongoDB
Observed Generation: 1
Reason: Successful
Status: True
Type: Successful
Observed Generation: 1
Phase: Successful
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal PauseDatabase 50s KubeDB Ops-manager operator Pausing MongoDB demo/mg-replicaset
Normal PauseDatabase 50s KubeDB Ops-manager operator Successfully paused MongoDB demo/mg-replicaset
Normal ScaleDownReplicaSet 30s KubeDB Ops-manager operator Successfully Horizontally Scaled Down ReplicaSet
Normal ResumeDatabase 30s KubeDB Ops-manager operator Resuming MongoDB demo/mg-replicaset
Normal ResumeDatabase 30s KubeDB Ops-manager operator Successfully resumed MongoDB demo/mg-replicaset
Normal Successful 30s KubeDB Ops-manager operator Successfully Horizontally Scaled Database
Now, we are going to verify the number of replicas this database has from the MongoDB object, number of pods the statefulset have,
$ kubectl get mongodb -n demo mg-replicaset -o json | jq '.spec.replicas'
3
$ kubectl get sts -n demo mg-replicaset -o json | jq '.spec.replicas'
3
Now let’s connect to a mongodb instance and run a mongodb internal command to check the number of replicas,
$ kubectl exec -n demo mg-replicaset-0 -- mongo admin -u root -p nrKuxni0wDSMrgwy --eval "db.adminCommand( { replSetGetStatus : 1 } ).members" --quiet
[
{
"_id" : 0,
"name" : "mg-replicaset-0.mg-replicaset-pods.demo.svc.cluster.local:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 410,
"optime" : {
"ts" : Timestamp(1614698784, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2021-03-02T15:26:24Z"),
"syncingTo" : "",
"syncSourceHost" : "",
"syncSourceId" : -1,
"infoMessage" : "",
"electionTime" : Timestamp(1614698393, 2),
"electionDate" : ISODate("2021-03-02T15:19:53Z"),
"configVersion" : 5,
"self" : true,
"lastHeartbeatMessage" : ""
},
{
"_id" : 1,
"name" : "mg-replicaset-1.mg-replicaset-pods.demo.svc.cluster.local:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 367,
"optime" : {
"ts" : Timestamp(1614698784, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1614698784, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2021-03-02T15:26:24Z"),
"optimeDurableDate" : ISODate("2021-03-02T15:26:24Z"),
"lastHeartbeat" : ISODate("2021-03-02T15:26:29.423Z"),
"lastHeartbeatRecv" : ISODate("2021-03-02T15:26:29.330Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "",
"syncingTo" : "mg-replicaset-0.mg-replicaset-pods.demo.svc.cluster.local:27017",
"syncSourceHost" : "mg-replicaset-0.mg-replicaset-pods.demo.svc.cluster.local:27017",
"syncSourceId" : 0,
"infoMessage" : "",
"configVersion" : 5
},
{
"_id" : 2,
"name" : "mg-replicaset-2.mg-replicaset-pods.demo.svc.cluster.local:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 322,
"optime" : {
"ts" : Timestamp(1614698784, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1614698784, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2021-03-02T15:26:24Z"),
"optimeDurableDate" : ISODate("2021-03-02T15:26:24Z"),
"lastHeartbeat" : ISODate("2021-03-02T15:26:31.022Z"),
"lastHeartbeatRecv" : ISODate("2021-03-02T15:26:31.224Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "",
"syncingTo" : "mg-replicaset-0.mg-replicaset-pods.demo.svc.cluster.local:27017",
"syncSourceHost" : "mg-replicaset-0.mg-replicaset-pods.demo.svc.cluster.local:27017",
"syncSourceId" : 0,
"infoMessage" : "",
"configVersion" : 5
}
]
From all the above outputs we can see that the replicas of the replicaset is 3. That means we have successfully scaled down the replicas of the MongoDB replicaset.
Cleaning Up
To clean up the Kubernetes resources created by this tutorial, run:
kubectl delete mg -n demo mg-replicaset
kubectl delete mongodbopsrequest -n demo mops-vscale-replicaset