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This is an Enterprise-only feature. Please install KubeDB Enterprise Edition to try this feature.
Upgrade version of MongoDB Standalone
This guide will show you how to use KubeDB Enterprise operator to upgrade the version of MongoDB standalone.
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
KubeDBCommunity and Enterprise 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.
Prepare MongoDB Standalone Database
Now, we are going to deploy a MongoDB standalone database with version 3.6.8.
Deploy MongoDB standalone :
In this section, we are going to deploy a MongoDB standalone database. Then, in the next section we will upgrade the version of 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-standalone
namespace: demo
spec:
version: "3.6.8-v1"
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/v2020.10.27-rc.1/docs/examples/mongodb/upgrading/mg-standalone.yaml
mongodb.kubedb.com/mg-standalone created
Now, wait until mg-standalone created has status Running. i.e,
$ kubectl get mg -n demo 20:05:47
NAME VERSION STATUS AGE
mg-standalone 3.6.8-v1 Running 8m58s
We are now ready to apply the MongoDBOpsRequest CR to upgrade this database.
Upgrade MongoDB Version
Here, we are going to upgrade MongoDB standalone from 3.6.8 to 4.0.5.
Create MongoDBOpsRequest:
In order to upgrade the standalone database, we have to create a MongoDBOpsRequest CR with your desired version that is supported by KubeDB. Below is the YAML of the MongoDBOpsRequest CR that we are going to create,
apiVersion: ops.kubedb.com/v1alpha1
kind: MongoDBOpsRequest
metadata:
name: mops-upgrade
namespace: demo
spec:
type: Upgrade
databaseRef:
name: mg-standalone
upgrade:
targetVersion: 4.0.5-v3
Here,
spec.databaseRef.namespecifies that we are performing operation onmg-standaloneMongoDB database.spec.typespecifies that we are going to performUpgradeon our database.spec.upgrade.targetVersionspecifies the expected version of the database4.0.5.
Let’s create the MongoDBOpsRequest CR we have shown above,
$ kubectl apply -f https://github.com/kubedb/docs/raw/v2020.10.27-rc.1/docs/examples/mongodb/upgrading/mops-upgrade-standalone.yaml
mongodbopsrequest.ops.kubedb.com/mops-upgrade created
Verify MongoDB version upgraded successfully :
If everything goes well, KubeDB Enterprise operator will update the image of MongoDB object and related StatefulSets and Pods.
Let’s wait for MongoDBOpsRequest to be Successful. Run the following command to watch MongoDBOpsRequest CR,
$ kubectl get mongodbopsrequest -n demo
Every 2.0s: kubectl get mongodbopsrequest -n demo
NAME TYPE STATUS AGE
mops-upgrade Upgrade Successful 3m45s
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 upgrade the database.
$ kubectl describe mongodbopsrequest -n demo mops-upgrade
Name: mops-upgrade
Namespace: demo
Labels: <none>
Annotations: API Version: ops.kubedb.com/v1alpha1
Kind: MongoDBOpsRequest
Metadata:
Creation Timestamp: 2020-08-24T14:22:10Z
Finalizers:
kubedb.com
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:type:
f:upgrade:
.:
f:targetVersion:
Manager: kubectl
Operation: Update
Time: 2020-08-24T14:22:10Z
API Version: ops.kubedb.com/v1alpha1
Fields Type: FieldsV1
fieldsV1:
f:metadata:
f:finalizers:
f:status:
.:
f:conditions:
f:observedGeneration:
f:phase:
Manager: kubedb-enterprise
Operation: Update
Time: 2020-08-24T14:22:26Z
Resource Version: 4786082
Self Link: /apis/ops.kubedb.com/v1alpha1/namespaces/demo/mongodbopsrequests/mops-upgrade
UID: c5f35015-75b7-4843-8f05-9181d8bf14a5
Spec:
Database Ref:
Name: mg-standalone
Type: Upgrade
Upgrade:
Target Version: 4.0.5-v3
Status:
Conditions:
Last Transition Time: 2020-08-24T14:22:10Z
Message: MongoDB ops request is starting to process
Observed Generation: 1
Reason: UpgradingVersion
Status: True
Type: UpgradingVersion
Last Transition Time: 2020-08-24T14:22:11Z
Message: Successfully halted mongodb: mg-standalone
Observed Generation: 1
Reason: HaltDatabase
Status: True
Type: HaltDatabase
Last Transition Time: 2020-08-24T14:22:11Z
Message: Successfully updated statefulsets update strategy type
Observed Generation: 1
Reason: UpdateStatefulSets
Status: True
Type: UpdateStatefulSets
Last Transition Time: 2020-08-24T14:22:26Z
Message: Successfully updated ReplicaSet images
Observed Generation: 1
Reason: UpdateReplicaSetImage
Status: True
Type: UpdateReplicaSetImage
Last Transition Time: 2020-08-24T14:22:26Z
Message: Succefully Resumed mongodb: mg-standalone
Observed Generation: 1
Reason: ResumeDatabase
Status: True
Type: ResumeDatabase
Last Transition Time: 2020-08-24T14:22:26Z
Message: Successfully completed the modification process.
Observed Generation: 1
Reason: Successful
Status: True
Type: Successful
Observed Generation: 1
Phase: Successful
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal HaltDatabase 10m KubeDB Enterprise Operator Pausing Mongodb mg-standalone in Namespace demo
Normal HaltDatabase 10m KubeDB Enterprise Operator Successfully Halted Mongodb mg-standalone in Namespace demo
Normal Updating 10m KubeDB Enterprise Operator Updating StatefulSets
Normal Updating 10m KubeDB Enterprise Operator Successfully Updated StatefulSets
Normal UpdateReplicaSetImage 10m KubeDB Enterprise Operator Updating ReplicaSet Images
Normal UpdateReplicaSetImage 10m KubeDB Enterprise Operator Successfully Updated Images of Pod (master): mg-standalone-0
Normal UpdateReplicaSetImage 10m KubeDB Enterprise Operator Successfully Updated ReplicaSet Images
Normal ResumeDatabase 10m KubeDB Enterprise Operator Resuming MongoDB
Normal ResumeDatabase 10m KubeDB Enterprise Operator Successfully Started Balancer
Normal Successful 10m KubeDB Enterprise Operator Successfully Updated Database
Now, we are going to verify whether the MongoDB and the related StatefulSets their Pods have the new version image. Let’s check,
$ kubectl get mg -n demo mg-standalone -o=jsonpath='{.spec.version}{"\n"}'
4.0.5-v3
$ kubectl get sts -n demo mg-standalone -o=jsonpath='{.spec.template.spec.containers[0].image}{"\n"}'
kubedb/mongo:4.0.5-v3
$ kubectl get pods -n demo mg-standalone-0 -o=jsonpath='{.spec.containers[0].image}{"\n"}'
kubedb/mongo:4.0.5-v3
You can see from above, our MongoDB standalone database has been updated with the new version. So, the upgrade process is successfully completed.
Cleaning Up
To clean up the Kubernetes resources created by this tutorial, run:
kubectl delete mg -n demo mg-standalone
kubectl delete mongodbopsrequest -n demo mops-upgrade