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Configure an Ops Manager Resource to use Local Mode

Configure an Ops Manager Resource to use Local Mode¶

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Prerequisites
Procedure

Important

Configuring Ops Manager to use Local Mode in Kubernetes is not recommended. Consider configuring Ops Manager to use Remote Mode instead.

In a default configuration, the MongoDB Agents and Backup Daemons access MongoDB installation archives over the Internet from MongoDB, Inc.

You can configure Ops Manager to run in Local Mode with the Kubernetes Operator if the nodes in your Kubernetes cluster don’t have access to the Internet. The Backup Daemons and managed MongoDB resources download installation archives only from a Persistent Volume that you create for the Ops Manager StatefulSet.

This procedure covers uploading installation archives to Ops Manager.

Prerequisites¶

Deploy an Ops Manager Resource. The following procedure shows you how to update your Ops Manager Kubernetes object to enable Local Mode.
To avoid downtime when you enable Local Mode, ensure that you set spec.replicas to a value greater than 1 in your Ops Manager resource definition.

If you updated your Ops Manager resource definition to make Ops Manager highly available, apply your changes before you begin this tutorial:
copy
```
kubectl apply -f <opsmgr-resource>.yaml -n <metadata.namespace>
```

Procedure¶

1

Configure `kubectl` to default to your namespace.¶

If you have not already, run the following command to execute all kubectl commands in the namespace you created:

copy

kubectl config set-context $(kubectl config current-context) --namespace=<metadata.namespace>

2

Delete the StatefulSet that manages your Ops Manager Pods.¶

In this tutorial, you update the StatefulSet that manages the Ops Manager Pods in your Kubernetes cluster.

You must first delete the Ops Manager StatefulSet so that Kubernetes can apply the updates that Local Mode requires.

Find the name of your Ops Manager StatefulSet:
copy
```
kubectl get statefulsets
```
The entry in the response that matches the metadata.name of your

Your Ops Manager StatefulSet is the entry in the response that matches the metadata.name in your Ops Manager resource definition.
```
kubectl get statefulsets -n mongodb
NAME                       READY   AGE
ops-manager-localmode      2/2     2m31s
ops-manager-localmode-db   3/3     4m46s
```
Delete the Ops Manager StatefulSet:

Warning

Ensure that you include the --cascade=false flag when you delete your Ops Manager StatefulSet. If you don’t include this flag, Kubernetes also deletes your Ops Manager Pods.
copy
```
kubectl delete statefulset --cascade=false <ops-manager-statefulset>
```

3

Copy the fields of this Ops Manager resource.¶

Copy Lines 9-31 of this example to:

Use the Ops Manager configuration setting automation.versions.source: local in spec.configuration to enable Local Mode.
Define a Persistent Volume for the Ops Manager StatefulSet to store the MongoDB installation archive. MongoDB Agents running in MongoDB database resource containers that you create with the Kubernetes Operator download the installation archives from Ops Manager instead of from the Internet.

copy

apiVersion: mongodb.com/v1
kind: MongoDBOpsManager
metadata:
 name: ops-manager-localmode
spec:
 replicas: 2
 version: "6.0.0"
 adminCredentials: ops-manager-admin-secret
 configuration:
   # this enables local mode in Ops Manager
   automation.versions.source: local
 statefulSet:
   spec:
     # the Persistent Volume Claim will be created for each Ops Manager Pod
     volumeClaimTemplates:
      - metadata:
          name: mongodb-versions
        spec:
          accessModes: [ "ReadWriteOnce" ]
          resources:
            requests:
              storage: "20Gi"
   template:
     spec:
       containers:
         - name: mongodb-ops-manager
           volumeMounts:
           - name: mongodb-versions
             # this is the directory in each Pod where all MongoDB
             # archives must be put
             mountPath: /mongodb-ops-manager/mongodb-releases
 backup:
  enabled: false
 applicationDatabase:
  members: 3
  persistent: true

4

Paste the copied example section into your existing Ops Manager resource.¶

Open your preferred text editor and paste the object specification into the appropriate location in your resource file.

5

Save your Ops Manager config file.¶

6

Apply changes to your Ops Manager deployment.¶

Invoke the following kubectl command on the filename of the Ops Manager resource definition:
copy
```
kubectl apply -f <opsmgr-resource>.yaml
```
Kubernetes creates a new Ops Manager StatefulSet when you apply the changes to your Ops Manager resource definition. Before proceeding to the next step, run the following command to ensure that the Ops Manager StatefulSet exists:
copy
```
kubectl get statefulsets
```
The new Ops Manager StatefulSet should show 0 members ready:
```
kubectl get statefulsets -n mongodb
NAME                       READY   AGE         ops-manager-localmode      0/2     2m31s
ops-manager-localmode-db   3/3     4m46s
```

7

In a rolling fashion, delete your old Ops Manager Pods.¶

List the Ops Manager Pods in your Kubernetes cluster:
copy
```
kubectl get pods
```
Delete one Ops Manager Pod:
copy
```
kubectl delete pod <om-pod-0>
```

Kubernetes recreates the Ops Manager Pod you deleted. Continue to get the status of the new Pod until it is ready:

copy

kubectl get pods

When the new Pod is initializing, the output is similar to the following example:

NAME                                          READY   STATUS    RESTARTS   AGE
mongodb-enterprise-operator-5648d4c86-k5brh   1/1     Running   0          5m24s
ops-manager-localmode-0                       0/1     Running   0          0m55s
ops-manager-localmode-1                       1/1     Running   0          5m45s
ops-manager-localmode-db-0                    1/1     Running   0          5m19s
ops-manager-localmode-db-1                    1/1     Running   0          4m54s
ops-manager-localmode-db-2                    1/1     Running   0          4m12s

When the new Pod is ready, the output is similar to the following example:

NAME                                          READY   STATUS    RESTARTS   AGE
mongodb-enterprise-operator-5648d4c86-k5brh   1/1     Running   0          5m24s
ops-manager-localmode-0                       1/1     Running   0          3m55s
ops-manager-localmode-1                       1/1     Running   0          5m45s
ops-manager-localmode-db-0                    1/1     Running   0          5m19s
ops-manager-localmode-db-1                    1/1     Running   0          4m54s
ops-manager-localmode-db-2                    1/1     Running   0          4m12s

Repeat Steps b and c until you’ve deleted all of your Ops Manager Pods and confirmed that all of the new Pods are ready.

8

Track the status of your Ops Manager instance.¶

To check the status of your Ops Manager resource, invoke the following command:

copy

kubectl get om -o yaml -w

See Troubleshoot the Kubernetes Operator for information about the resource deployment statuses.

After the Ops Manager resource completes the Reconciling phase, the command returns output similar to the following:

status:
  applicationDatabase:
    lastTransition: "2020-05-15T16:20:22Z"
    members: 3
    phase: Running
    type: ReplicaSet
    version: "4.2.11-ent"
  backup:
    phase: ""
  opsManager:
    lastTransition: "2020-05-15T16:20:26Z"
    phase: Running
    replicas: 1
    url: http://ops-manager-localmode-svc.mongodb.svc.cluster.local:8080
    version: "5.0.0"

Copy the value of the status.opsManager.url field, which states the resource’s connection URL. You use this value when you create a ConfigMap later in the procedure.

9

Download the MongoDB installation archive to your local machine.¶

The installers that you download depend on the environment to which you deployed the operator:

Note

The following example includes a link that allows you to download the specified version of MongoDB Community Edition. To download any other version of MongoDB Community Edition, visit the MongoDB Community Edition Download Center. To download MongoDB Enterprise Edition, visit the MongoDB Enterprise Download Center.

Vanilla Kubernetes
OpenShift

Download the Ubuntu 20.04 installation tarball for the MongoDB Server version you want the Kubernetes Operator to deploy. For example, to download the 4.4.0 release:
copy
```
curl -OL https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-ubuntu1604-4.4.0.tgz
```

Download the RHEL installation tarball for the MongoDB database version you want the Kubernetes Operator to deploy. For example, to download the 4.4.0 release:
copy
```
curl -OL https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-rhel<version>-4.4.0.tgz
```

10

Copy the MongoDB archive to the Ops Manager Persistent Volume.¶

Copy the MongoDB archive for each MongoDB version you intend to deploy to the Ops Manager Persistent Volume.

The commands that you use depend on the environment to which you deployed the Kubernetes Operator:

Note

If you deployed more than one Ops Manager replica, copy only the MongoDB installation tarball packages to Replica 1 and beyond.

Vanilla Kubernetes
OpenShift

To copy the MongoDB installation archive to the Ops Manager PersistentVolume:

Copy the MongoDB Server installation tarball to the Ops Manager PersistentVolume. For example, to copy the 5.0.0 release:

Replica 0:

copy

kubectl cp mongodb-linux-x86_64-ubuntu1604-5.0.0.tgz \
"ops-manager-localmode-0:/mongodb-ops-manager/mongodb-releases/mongodb-linux-x86_64-ubuntu1604-5.0.0.tgz"

Replica 1:

copy

kubectl cp mongodb-linux-x86_64-ubuntu1604-5.0.0.tgz \
"ops-manager-localmode-1:/mongodb-ops-manager/mongodb-releases/mongodb-linux-x86_64-ubuntu1604-5.0.0.tgz"

To copy the MongoDB installation archive to the Ops Manager PersistentVolume:

Copy the MongoDB Server installation tarball to the Ops Manager PersistentVolume. For example, to copy the 5.0.0 release:

Replica 0:

copy

oc rsync  "ops-manager-localmode-0:/mongodb-ops-manager/mongodb-releases/mongodb-linux-x86_64-rhel<version>-5.0.0.tgz" \
mongodb-linux-x86_64-rhel<version>-5.0.0.tgz

Replica 1:

copy

oc rsync  "ops-manager-localmode-1:/mongodb-ops-manager/mongodb-releases/mongodb-linux-x86_64-rhel<version>-5.0.0.tgz" \
mongodb-linux-x86_64-rhel<version>-5.0.0.tgz

11

Deploy a MongoDB Database Resource.¶

If you have not done so already, complete the following prerequisites:
- Create Credentials for the Kubernetes Operator
- Create One Project using a ConfigMap
Deploy a MongoDB database resource in the same namespace to which you deployed Ops Manager. Ensure that you:
1. Match the spec.opsManager.configMapRef.name of the resource to the metadata.name of your ConfigMap.
2. Match the spec.credentials of the resource to the name of the secret you created that contains an Ops Manager programmatic API key pair.

MongoDB Agents run in MongoDB database resource containers that you create with the Kubernetes Operator. Download the installation archives from Ops Manager instead of downloading them from the Internet.

Configure an Ops Manager Resource to use Local Mode¶

Prerequisites¶

Procedure¶

Configure kubectl to default to your namespace.¶

Delete the StatefulSet that manages your Ops Manager Pods.¶

Copy the fields of this Ops Manager resource.¶

Paste the copied example section into your existing Ops Manager resource.¶

Save your Ops Manager config file.¶

Apply changes to your Ops Manager deployment.¶

In a rolling fashion, delete your old Ops Manager Pods.¶

Track the status of your Ops Manager instance.¶

Download the MongoDB installation archive to your local machine.¶

Copy the MongoDB archive to the Ops Manager Persistent Volume.¶

Deploy a MongoDB Database Resource.¶

Configure `kubectl` to default to your namespace.¶