KubeDB

By AppsCode

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New to KubeDB? Please start here.

GitOps MongoDB using KubeDB GitOps Operator

This guide will show you how to use KubeDB GitOps operator to create MongoDB database and manage updates using GitOps workflow.

Before You Begin

  • At first, you need to have a Kubernetes cluster, and the kubectl command-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 KubeDB operator in your cluster following the steps here. Pass --set kubedb-crd-manager.installGitOpsCRDs=true in the kubedb installation process to enable GitOps operator.

  • You need to install GitOps tools like ArgoCD or FluxCD and configure with your Git Repository to monitor the Git repository and synchronize the state of the Kubernetes cluster with the desired state defined in Git.

    $ kubectl create ns monitoring
namespace/monitoring created


$ kubectl create ns demo
namespace/demo created

Note: YAML files used in this tutorial are stored in docs/examples/MongoDB folder in GitHub repository kubedb/docs.

We are going to use ArgoCD in this tutorial. You can install ArgoCD in your cluster by following the steps here. Also, you need to install argocd CLI in your local machine. You can install argocd CLI by following the steps here.

Creating Apps via CLI

For Public Repository

argocd app create kubedb --repo <repo-url> --path kubedb --dest-server https://kubernetes.default.svc --dest-namespace <namespace>

For Private Repository

Using HTTPS

argocd app create kubedb --repo <repo-url> --path kubedb --dest-server https://kubernetes.default.svc --dest-namespace <namespace> --username <username> --password <github-token>

Using SSH

Registering a Git repository in Argo CD using SSH authentication

argocd repo add <ssh-repo-url> \
  --ssh-private-key-path <path-to-private-key>

Creating an Argo CD Application to deploy resources from the repository into a Kubernetes cluster

argocd app create <application-name> \
  --repo <repository-url> \
  --path <repository-path> \
  --dest-server <kubernetes-api-server> \
  --dest-namespace <target-namespace>

Create MongoDB Database using GitOps

Create a MongoDB GitOps CR

apiVersion: gitops.kubedb.com/v1alpha1
kind: MongoDB
metadata:
  name: mg-gitops
  namespace: demo
spec:
  version: "8.0.10"
  replicaSet: 
    name: "replicaset"
  replicas: 2
  storageType: Durable
  storage:
    storageClassName: longhorn
    accessModes:
    - ReadWriteOnce
    resources:
      requests:
        storage: 1Gi

Create a directory like below,

$ tree .
├── kubedb
    └── MongoDB.yaml
1 directories, 1 files

Now commit the changes and push to your Git repository. Your repository is synced with ArgoCD and the MongoDB CR is created in your cluster.

Our gitops operator will create an actual MongoDB database CR in the cluster. List the resources created by gitops operator in the demo namespace.

$  kubectl get MongoDB.gitops.kubedb.com,MongoDB.kubedb.com -n demo
NAME                                  AGE
mongodb.gitops.kubedb.com/mg-gitops   33m

NAME                           VERSION   STATUS   AGE
mongodb.kubedb.com/mg-gitops   8.0.10    Ready    33m

List the resources created by kubedb operator created for kubedb.com/v1 MongoDB.

$ kubectl get petset,pod,secret,service,appbinding -n demo -l 'app.kubernetes.io/instance=mg-gitops'
NAME                                     AGE
petset.apps.k8s.appscode.com/mg-gitops   34m

NAME              READY   STATUS    RESTARTS   AGE
pod/mg-gitops-0   2/2     Running   0          34m
pod/mg-gitops-1   2/2     Running   0          33m

NAME                    TYPE                       DATA   AGE
secret/mg-gitops-auth   kubernetes.io/basic-auth   2      34m
secret/mg-gitops-key    Opaque                     1      34m

NAME                     TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)     AGE
service/mg-gitops        ClusterIP   10.43.206.183   <none>        27017/TCP   34m
service/mg-gitops-pods   ClusterIP   None            <none>        27017/TCP   34m

NAME                                           TYPE                 VERSION   AGE
appbinding.appcatalog.appscode.com/mg-gitops   kubedb.com/mongodb   8.0.10    34m

Update MongoDB Database using GitOps

Scale MongoDB Database Resources

Before scaling database resouces:

kubectl get pod -n demo mg-gitops-0 -o json | jq '.spec.containers[0].resources'
{
  "limits": {
    "memory": "1536Mi"
  },
  "requests": {
    "cpu": "800m",
    "memory": "1536Mi"
  }
}

Update the MongoDB.yaml with the following,

apiVersion: gitops.kubedb.com/v1alpha1
kind: MongoDB
metadata:
  name: mg-gitops
  namespace: demo
spec:
  version: "8.0.10"
  replicaSet: 
    name: "replicaset"
  replicas: 2
  podTemplate:
   spec:
     containers:
     - name: mongodb
       resources:
         limits:
           memory: 2Gi
         requests:
           cpu: 1000m
           memory: 2Gi
  storageType: Durable
  storage:
    storageClassName: longhorn
    accessModes:
    - ReadWriteOnce
    resources:
      requests:
        storage: 1Gi

Resource Requests and Limits are updated from 800m to 1000m CPU and 2Gi Memory. Commit the changes and push to your Git repository. Your repository is synced with ArgoCD and the MongoDB CR is updated in your cluster.

Now, gitops operator will detect the resource changes and create a MongoDBOpsRequest to update the MongoDB database. List the resources created by gitops operator in the demo namespace.

$kubectl get mg,mongodb,mgops -n demo
NAME                           VERSION   STATUS   AGE
mongodb.kubedb.com/mg-gitops   8.0.10    Ready    13m

NAME                                  AGE
mongodb.gitops.kubedb.com/mg-gitops   13m

NAME                                                                TYPE              STATUS       AGE
mongodbopsrequest.ops.kubedb.com/mg-gitops-verticalscaling-ojwxpm   VerticalScaling   Successful   4m35s

After Ops Request becomes Successful, We can validate the changes by checking the one of the pod,

$ kubectl get pod -n demo mg-gitops-0 -o json | jq '.spec.containers[0].resources'
{
  "limits": {
    "memory": "2Gi"
  },
  "requests": {
    "cpu": "1",
    "memory": "2Gi"
  }
}

Scale MongoDB Replicas

Update the MongoDB.yaml with the following,

apiVersion: gitops.kubedb.com/v1alpha1
kind: MongoDB
metadata:
  name: mg-gitops
  namespace: demo
spec:
  version: "8.0.10"
  replicaSet: 
    name: "replicaset"
  replicas: 3
  podTemplate:
   spec:
     containers:
     - name: mongodb
       resources:
         limits:
           memory: 2Gi
         requests:
           cpu: 1000m
           memory: 2Gi
  storageType: Durable
  storage:
    storageClassName: longhorn
    accessModes:
    - ReadWriteOnce
    resources:
      requests:
        storage: 1Gi

Update the replicas to 3. Commit the changes and push to your Git repository. Your repository is synced with ArgoCD and the MongoDB CR is updated in your cluster. Now, gitops operator will detect the replica changes and create a HorizontalScaling MongoDBOpsRequest to update the MongoDB database replicas. List the resources created by gitops operator in the demo namespace.

$ kubectl get mg,mongodb,mgops -n demo
NAME                           VERSION   STATUS   AGE
mongodb.kubedb.com/mg-gitops   8.0.10    Ready    18m

NAME                                  AGE
mongodb.gitops.kubedb.com/mg-gitops   18m

NAME                                                                  TYPE                STATUS       AGE
mongodbopsrequest.ops.kubedb.com/mg-gitops-horizontalscaling-n8xx64   HorizontalScaling   Successful   4m2s
mongodbopsrequest.ops.kubedb.com/mg-gitops-verticalscaling-ojwxpm     VerticalScaling     Successful   9m5s

After Ops Request becomes Successful, We can validate the changes by checking the number of pods,

$ kubectl get pod -n demo -l 'app.kubernetes.io/instance=mg-gitops'
NAME          READY   STATUS    RESTARTS   AGE
mg-gitops-0   2/2     Running   0          8m37s
mg-gitops-1   2/2     Running   0          9m22s
mg-gitops-2   2/2     Running   0          4m34s

We can also scale down the replicas by updating the replicas fields.

Expand MongoDB Volume

Update the MongoDB.yaml with the following,

apiVersion: gitops.kubedb.com/v1alpha1
kind: MongoDB
metadata:
  name: mg-gitops
  namespace: demo
spec:
  version: "8.0.10"
  replicaSet: 
    name: "replicaset"
  replicas: 3
  podTemplate:
   spec:
     containers:
     - name: mongodb
       resources:
         limits:
           memory: 2Gi
         requests:
           cpu: 1000m
           memory: 2Gi
  storageType: Durable
  storage:
    storageClassName: longhorn
    accessModes:
    - ReadWriteOnce
    resources:
      requests:
        storage: 2Gi

Update the storage.resources.requests.storage to 2Gi. Commit the changes and push to your Git repository. Your repository is synced with ArgoCD and the MongoDB CR is updated in your cluster.

Now, gitops operator will detect the volume changes and create a VolumeExpansion MongoDBOpsRequest to update the MongoDB database volume. List the resources created by gitops operator in the demo namespace.

$ kubectl get mg,mongodb,mgops -n demo
NAME                           VERSION   STATUS   AGE
mongodb.kubedb.com/mg-gitops   8.0.10    Ready    21m

NAME                                  AGE
mongodb.gitops.kubedb.com/mg-gitops   21m

NAME                                                                  TYPE                STATUS       AGE
mongodbopsrequest.ops.kubedb.com/mg-gitops-horizontalscaling-n8xx64   HorizontalScaling   Successful   7m24s
mongodbopsrequest.ops.kubedb.com/mg-gitops-verticalscaling-ojwxpm     VerticalScaling     Successful   12m
mongodbopsrequest.ops.kubedb.com/mg-gitops-volumeexpansion-8441ym     VolumeExpansion     Successful   2m10s

After Ops Request becomes Successful, We can validate the changes by checking the pvc size,

$ kubectl get pvc -n demo -l 'app.kubernetes.io/instance=mg-gitops'
NAME                  STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   VOLUMEATTRIBUTESCLASS   AGE
datadir-mg-gitops-0   Bound    pvc-cea7fe6a-dd75-4e81-99d3-9ab2867c6650   2Gi        RWO            longhorn       <unset>                 22m
datadir-mg-gitops-1   Bound    pvc-bcd63bd2-b3b8-4fb8-8c35-5f6e40031f61   2Gi        RWO            longhorn       <unset>                 21m
datadir-mg-gitops-2   Bound    pvc-2535f213-28fb-41ef-bdfd-7fbe91859c81   2Gi        RWO            longhorn       <unset>               7m56s

Reconfigure MongoDB

At first, we will create mongod.conf file containing required configuration settings.

apiVersion: v1
kind: Secret
metadata:
  name: mg-custom-config
  namespace: demo
type: Opaque
stringData:
  mongod.conf: |
    net:
      maxIncomingConnections: 10000

Add this file to Kubedb\reconfig.yaml repository.

Update the MongoDB.yaml with the following,

apiVersion: gitops.kubedb.com/v1alpha1
kind: MongoDB
metadata:
  name: mg-gitops
  namespace: demo
spec:
  version: "8.0.10"
  replicaSet: 
    name: "replicaset"
  replicas: 3
  podTemplate:
   spec:
     containers:
     - name: mongodb
       resources:
         limits:
           memory: 2Gi
         requests:
           cpu: 1000m
           memory: 2Gi
  storageType: Durable
  storage:
    storageClassName: longhorn
    accessModes:
    - ReadWriteOnce
    resources:
      requests:
        storage: 2Gi
  configuration:
    secretName: mg-custom-config

Commit the changes and push to your Git repository. Your repository is synced with ArgoCD and the MongoDB CR is updated in your cluster.

Now, gitops operator will detect the configuration changes and create a Reconfigure MongoDBOpsRequest to update the MongoDB database configuration. List the resources created by gitops operator in the demo namespace.

$  kubectl get mg,mongodb,mgops -n demo
NAME                           VERSION   STATUS   AGE
mongodb.kubedb.com/mg-gitops   8.0.10    Ready    32m

NAME                                  AGE
mongodb.gitops.kubedb.com/mg-gitops   32m

NAME                                                                  TYPE                STATUS       AGE
mongodbopsrequest.ops.kubedb.com/mg-gitops-horizontalscaling-n8xx64   HorizontalScaling   Successful   17m
mongodbopsrequest.ops.kubedb.com/mg-gitops-reconfigure-djow20         Reconfigure         Successful   6m7s
mongodbopsrequest.ops.kubedb.com/mg-gitops-verticalscaling-ojwxpm     VerticalScaling     Successful   22m
mongodbopsrequest.ops.kubedb.com/mg-gitops-volumeexpansion-8441ym     VolumeExpansion     Successful   12m

We can also reconfigure the parameters creating another secret and reference the secret in the configuration.secretName field. Also you can remove the configuration field to use the default parameters.

Rotate Auth

To do that, create a kubernetes.io/basic-auth type k8s secret with the new username and password.

We will do that using gitops, create the file kubedb/mg-auth.yaml with the following content,

apiVersion: v1
kind: Secret
metadata:
  name: mgauth
  namespace: demo
type: kubernetes.io/basic-auth
stringData:
  username: root
  password: mongodb-secret

Let’s add that to our kubedb/mg-auth.yaml file. File structure will look like this,

$ tree .
├── kubedb
│ ├── mg-configuration.yaml
│ ├── mg-auth.yaml
│ └── mongodb.yaml
1 directories, 3 files

Update the MongoDB.yaml with the following,

apiVersion: gitops.kubedb.com/v1alpha1
kind: MongoDB
metadata:
  name: mg-gitops
  namespace: demo
spec:
  version: "8.0.10"
  replicaSet: 
    name: "replicaset"
  replicas: 3
  podTemplate:
   spec:
     containers:
     - name: mongodb
       resources:
         limits:
           memory: 2Gi
         requests:
           cpu: 1000m
           memory: 2Gi
  storageType: Durable
  storage:
    storageClassName: longhorn
    accessModes:
    - ReadWriteOnce
    resources:
      requests:
        storage: 2Gi
  configuration:
    secretName: mg-custom-config
  authSecret:
    kind: Secret
    name: mgauth

Add the secret name in authSecret field. Commit the changes and push to your Git repository. Your repository has been successfully synchronized with ArgoCD. The MongoDB CR has been updated, and the authentication file have been created in the cluster.

Now, gitops operator will detect the auth changes and create a RotateAuth MongoDBOpsRequest to update the MongoDB database auth. List the resources created by gitops operator in the demo namespace.

$ kubectl get mg,mongodb,mgops -n demo
NAME                           VERSION   STATUS   AGE
mongodb.kubedb.com/mg-gitops   8.0.10    Ready    41m

NAME                                  AGE
mongodb.gitops.kubedb.com/mg-gitops   41m

NAME                                                                  TYPE                STATUS       AGE
mongodbopsrequest.ops.kubedb.com/mg-gitops-horizontalscaling-n8xx64   HorizontalScaling   Successful   27m
mongodbopsrequest.ops.kubedb.com/mg-gitops-reconfigure-djow20         Reconfigure         Successful   15m
mongodbopsrequest.ops.kubedb.com/mg-gitops-rotate-auth-u75ihg         RotateAuth          Successful   3m10s
mongodbopsrequest.ops.kubedb.com/mg-gitops-verticalscaling-ojwxpm     VerticalScaling     Successful   32m
mongodbopsrequest.ops.kubedb.com/mg-gitops-volumeexpansion-8441ym     VolumeExpansion     Successful   22m

Update Version

List MongoDB versions using kubectl get mgversion and choose desired version that is compatible for upgrade from current version. Check the version constraints and ops request here.

Let’s choose 8.0.17 in this example.

Update the MongoDB.yaml with the following,

apiVersion: gitops.kubedb.com/v1alpha1
kind: MongoDB
metadata:
 name: mg-gitops
 namespace: demo
spec:
 version: "8.0.17"
 replicaSet:
   name: "replicaset"
 replicas: 3
 podTemplate:
   spec:
     containers:
     - name: mongodb
       resources:
         limits:
           memory: 1Gi
         requests:
           cpu: "1"
           memory: 1Gi
 storageType: Durable
 storage:
   storageClassName: longhorn
   accessModes:
   - ReadWriteOnce
   resources:
     requests:
       storage: 1Gi

Update the version field to 8.0.17. Commit the changes and push to your Git repository. Your repository is synced with ArgoCD and the MongoDB CR is updated in your cluster.

Now, gitops operator will detect the version changes and create a VersionUpdate MongoDBOpsRequest to update the MongoDB database version. List the resources created by gitops operator in the demo namespace.

$ kubectl get mg,mongodb,mgops -n demo
NAME                           VERSION   STATUS   AGE
mongodb.kubedb.com/mg-gitops   8.0.17    Ready    46m

NAME                                  AGE
mongodb.gitops.kubedb.com/mg-gitops   46m

NAME                                                                  TYPE                STATUS       AGE
mongodbopsrequest.ops.kubedb.com/mg-gitops-horizontalscaling-n8xx64   HorizontalScaling   Successful   31m
mongodbopsrequest.ops.kubedb.com/mg-gitops-reconfigure-djow20         Reconfigure         Successful   20m
mongodbopsrequest.ops.kubedb.com/mg-gitops-rotate-auth-u75ihg         RotateAuth          Successful   7m19s
mongodbopsrequest.ops.kubedb.com/mg-gitops-versionupdate-kkc2gc       UpdateVersion       Successful   2m38s
mongodbopsrequest.ops.kubedb.com/mg-gitops-verticalscaling-ojwxpm     VerticalScaling     Successful   36m
mongodbopsrequest.ops.kubedb.com/mg-gitops-volumeexpansion-8441ym     VolumeExpansion     Successful   26m

Now, we are going to verify whether the MongoDB, PetSet and it’s Pod have updated with new image. Let’s check,

$ kubectl get MongoDB -n demo mg-gitops -o=jsonpath='{.spec.version}{"\n"}'
8.0.17
$ kubectl get petset -n demo mg-gitops -o=jsonpath='{.spec.template.spec.containers[0].image}{"\n"}'
ghcr.io/appscode-images/mongo:8.0.17@sha256:b3e1ae71bd7df56b3497527f2b08549bfccb532d9e26df6d4a1331a71cd085db
$ kubectl get pod -n demo mg-gitops-0 -o=jsonpath='{.spec.containers[0].image}{"\n"}'
ghcr.io/appscode-images/mongo:8.0.17@sha256:b3e1ae71bd7df56b3497527f2b08549bfccb532d9e26df6d4a1331a71cd085db

Enable Monitoring

If you already don’t have a Prometheus server running, deploy one following tutorial from here.

Update the MongoDB.yaml with the following,

apiVersion: gitops.kubedb.com/v1alpha1
kind: MongoDB
metadata:
  name: mg-gitops
  namespace: demo
spec:
  version: "8.0.17"
  replicaSet: 
    name: "replicaset"
  replicas: 3
  podTemplate:
    spec:
      containers:
      - name: mongodb
        resources:
          limits:
            memory: 2Gi
          requests:
            cpu: 1000m
            memory: 2Gi
  storageType: Durable
  storage:
    storageClassName: longhorn
    accessModes:
    - ReadWriteOnce
    resources:
      requests:
        storage: 2Gi
  configuration:
    secretName: mg-custom-config
  authSecret:
    kind: Secret
    name: mgauth
  monitor:
    agent: prometheus.io/operator
    prometheus:
      serviceMonitor:
        labels:
          release: prometheus
        interval: 10s

Add monitor field in the spec. Commit the changes and push to your Git repository. Your repository is synced with ArgoCD and the MongoDB CR is updated in your cluster.

Now, gitops operator will detect the monitoring changes and create a Restart MongoDBOpsRequest to add the MongoDB database monitoring. List the resources created by gitops operator in the demo namespace.

$ kubectl get mg,mongodb,mgops -n demo
NAME                           VERSION   STATUS   AGE
mongodb.kubedb.com/mg-gitops   8.0.17    Ready    52m

NAME                                  AGE
mongodb.gitops.kubedb.com/mg-gitops   52m

NAME                                                                  TYPE                STATUS       AGE
mongodbopsrequest.ops.kubedb.com/mg-gitops-horizontalscaling-n8xx64   HorizontalScaling   Successful   38m
mongodbopsrequest.ops.kubedb.com/mg-gitops-reconfigure-djow20         Reconfigure         Successful   26m
mongodbopsrequest.ops.kubedb.com/mg-gitops-restart-ykgxj3             Restart             Successful   3m45s
mongodbopsrequest.ops.kubedb.com/mg-gitops-rotate-auth-u75ihg         RotateAuth          Successful   13m
mongodbopsrequest.ops.kubedb.com/mg-gitops-versionupdate-kkc2gc       UpdateVersion       Successful   9m15s
mongodbopsrequest.ops.kubedb.com/mg-gitops-verticalscaling-ojwxpm     VerticalScaling     Successful   43m
mongodbopsrequest.ops.kubedb.com/mg-gitops-volumeexpansion-8441ym     VolumeExpansion     Successful   32m

Verify the monitoring is enabled by checking the prometheus targets.

TLS configuration

We are going to create an example Issuer that will be used throughout the duration of this tutorial to enable SSL/TLS in MongoDB. Alternatively, you can follow this cert-manager tutorial to create your own Issuer.

  • Start off by generating you ca certificates using openssl.
openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout ./ca.key -out ./ca.crt -subj "/CN=mongo/O=kubedb"
  • Now create a ca-secret using the certificate files you have just generated.
$ kubectl create secret tls mongo-ca \
     --cert=ca.crt \
     --key=ca.key \
     --namespace=demo

Now, create an Issuer using the ca-secret you have just created. The YAML file looks like this:

apiVersion: cert-manager.io/v1
kind: Issuer
metadata:
  name: mongo-ca-issuer
  namespace: demo
spec:
  ca:
    secretName: mongo-ca

Apply the YAML file:

$ kubectl create -f https://github.com/kubedb/docs/raw/v2026.6.19/docs/examples/mongodb/tls/issuer.yaml
issuer.cert-manager.io/mongo-ca-issuer created

Let’s add that to our kubedb/mg-issuer.yaml file. File structure will look like this,

$ tree .
├── kubedb
│ ├── mg-configuration.yaml
│ ├── mg-auth.yaml
│ ├── mg-issuer.yaml
│ ├── mg-secret.yaml
│ └── mongodb.yaml
1 directories, 5 files

Update the mongodb.yaml with the following,

apiVersion: gitops.kubedb.com/v1alpha1
kind: MongoDB
metadata:
  name: mg-gitops
  namespace: demo
spec:
  version: "8.0.17"
  replicaSet: 
    name: "replicaset"
  replicas: 3
  podTemplate:
   spec:
     containers:
     - name: mongodb
       resources:
         limits:
           memory: 2Gi
         requests:
           cpu: 1000m
           memory: 2Gi
  storageType: Durable
  storage:
    storageClassName: longhorn
    accessModes:
    - ReadWriteOnce
    resources:
      requests:
        storage: 2Gi
  configuration:
    secretName: mg-custom-config
  authSecret:
    kind: Secret
    name: mgauth
  monitor:
    agent: prometheus.io/operator
    prometheus:
      serviceMonitor:
        labels:
          release: prometheus
        interval: 10s
  tls:
    issuerRef:
      name: mg-issuer
      kind: Issuer
      apiGroup: "cert-manager.io"
    certificates:
      - alias: client
        subject:
          organizations:
            - mongo
          organizationalUnits:
            - client

Add sslMode and tls fields in the spec. Commit the changes and push to your Git repository. Your repository has been successfully synchronized with ArgoCD. The MongoDB CR has been updated, and both the issuer and the corresponding secret have been created in the cluster.

Now, gitops operator will detect the tls changes and create a ReconfigureTLS ElasticsearchOpsRequest to update the MongoDB database tls. List the resources created by gitops operator in the demo namespace.

$ kubectl get mg,mongodb,mgops -n demo
NAME                           VERSION   STATUS   AGE
mongodb.kubedb.com/mg-gitops   8.0.17    Ready    20m

NAME                                  AGE
mongodb.gitops.kubedb.com/mg-gitops   20m

NAME                                                               TYPE             STATUS       AGE
mongodbopsrequest.ops.kubedb.com/mg-gitops-reconfiguretls-2pzvw4   ReconfigureTLS   Successful   10m

We can also rotate the certificates updating .spec.tls.certificates field. Also you can remove the .spec.tls field to remove tls for MongoDB.

Next Steps

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