Add Existing MongoDB Processes to Ops Manager

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Considerations

Prerequisites
Procedures

Ops Manager provides a wizard for adding your existing MongoDB deployments to monitoring and management. The wizard prompts you to:

Install the MongoDB Agent if you don't have it installed
Identify the sharded cluster, the replica set, or the standalone to add. You can choose to add the deployment to Monitoring or to both Monitoring and Automation.
If you are adding a deployment that you intend to live migrate to Atlas, you need to add the deployment (and its credentials) only for Monitoring.

Considerations

Unique Names

Deployments must have unique names within the projects.

Important

Replica set, sharded cluster, and shard names within the same project must be unique. Failure to have unique names for the deployments will result in broken backup snapshots.

MongoDB Configuration Options

Automation doesn't support all MongoDB options, which can result in failed import attempts. To learn more, see MongoDB Settings and Automation Support.

TLS

If you enable TLS, the FQDN for the host serving a MongoDB process must match the SAN for the TLS certificate on that host.

Important

To prevent man-in-the-middle attacks, keep the scope of TLS certificates as narrow as possible. Although you can use one TLS certificate with many SANs, or a wildcard TLS certificate on each host, you should not. To learn more, see RFC 2818, section 3.1.

Preferred Hostnames

Set up a preferred hostname if you:

Require a specific hostname, FQDN, IPv4 address or IPv6 address to access the MongoDB process, or
Must specify the hostname to use for hosts with multiple aliases.

To learn more, see the Preferred Hostnames setting in Project Settings.

Restore a Previously Removed Host

If you have not completely removed a host from Ops Manager and want to restore that host, you can reimport the deleted MongoDB process.

If you have completely removed a host from Ops Manager, you need to undelete that host first. To search for a deleted host, you must have the Global Owner role.

To locate and undelete a previously deleted host:

Navigate to the Deployment view.
From the More menu, click Deleted Hosts.
Select the to undelete the host.

After the host has been undeleted, you can import existing process procedure.

Note

If your host does not appear in the Deleted Hosts list, you should be able to reimport the process immediately.

Managing Windows MongoDB Services

If you are adding an existing MongoDB process that runs as a Windows Service to Automation, Automation:

Stops and disables the existing service
Creates and starts a new service

Authentication Credentials on Source and Destination Clusters

If the Ops Manager project has MongoDB authentication settings enabled for its deployments, the MongoDB deployment you import must support the project's authentication mechanism.

We recommend that you import to a new destination project that has no running processes and doesn't have authentication enabled.

If the source cluster uses authentication, and the destination Ops Manager project doesn't have any existing managed processes, Ops Manager enables authentication in the destination project, imports the existing keyfile from the source cluster, and uses it to authenticate the user that conducts the import process.

If the source cluster and the destination Ops Manager project both use authentication, and the project has processes, Ops Manager attempts to use existing authentication settings in the destination project during the import process. For the import process to succeed, authentication credentials on the source cluster and the Ops Manager destination project must be the same.

To ensure that import is successful, before you start the import process, add the Ops Manager destination project's credentials on the source cluster. To learn more, see Rotate Keys for Replica Set or Rotate Keys for Sharded Clusters.

Authentication Use Cases

If your MongoDB deployment requires authentication, when you add the deployment to Ops Manager for monitoring, you must provide the necessary credentials.

If the deployment doesn't use Automation, but did use Backup, Monitoring, or both, you can find those credentials where the credentials were before updating to the MongoDB Agent.
If the deployment doesn't use Automation, but will use Backup, Monitoring, or both:
1. Create the credentials for the MongoDB Deployment. To learn more, see Required Access for MongoDB Agent for Monitoring and Required Access for MongoDB Agent for Backup.
2. Add the credentials that you granted to those functions to Ops Manager after you add the MongoDB processes. To learn more, see Add Credentials for Monitoring and Add Credentials for Backup.
If the deployment uses Automation, Ops Manager uses the credentials from the MongoDB Agent. You can delete the credentials from the legacy Backup, and Monitoring Agents. The MongoDB Agent uses those credentials for its Automation, Backup, and Monitoring functions.
If the deployment will use Automation but didn't use it before you import it, add the mms-automation user to the database processes you imported and add the user's credentials to Ops Manager.

To learn more, see Add Credentials for Automation.

Automation and Updated Security Settings Upon Import

Adding a MongoDB deployment to automation may affect the security settings of the Ops Manager project and the MongoDB deployment.

Automation enables the Project Security Setting. If the MongoDB deployment requires authentication but the Ops Manager project doesn't have authentication settings enabled, when you add the MongoDB deployment to automation, Ops Manager updates the project's security settings to the security settings of the newly imported deployment.
The import process only updates the Ops Manager project's security setting if the project's security setting is currently disabled. The import process doesn't disable the project's security setting or change its enabled authentication mechanism.
Automation Imports MongoDB Users and Roles. The following statements apply to situations where a MongoDB deployment requires authentication or the Ops Manager project has authentication settings enabled.
If the MongoDB deployment contains users or user-defined roles, you can choose to import these users and roles for Ops Manager to manage. The imported users and roles are Synced to all managed deployments in the Ops Manager project.
- If you set the project's Enforce Consistent Set value to Yes, Ops Manager deletes from the MongoDB deployments those users and roles that are not imported.
- If you set the project's Enforce Consistent Set value to No, Ops Manager stops managing non-imported users and roles in the project. These users and roles remain in the MongoDB deployment. To manage these users and roles, you must connect directly to the MongoDB deployment.
If you don't want the Ops Manager project to manage specific users and roles, use the Authentication & Users and Authentication & Roles pages to remove these users and roles during import before you confirm and deploy the changes. To learn more, see Manage or Unmanage MongoDB Users.
If the imported MongoDB deployment already has mms-backup-agent and mms-monitoring-agent users in its admin database, the import process overrides these users' roles with the roles for mms-backup-agent and mms-monitoring-agent users as set in the Ops Manager project.
Automation Applies to All Deployments in the Project. The project's updated security settings, including all users and roles managed by the Ops Manager project, apply to all deployments in the project, including the imported MongoDB deployment.
Ops Manager restarts all deployments in the project with the new setting, including the imported MongoDB deployment. After import, all deployments in the project use the Ops Manager automation keyfile upon restart.
The deployment that you import must use the same keyfile as the existing processes in the destination project or the import process may not proceed. To learn more, see Authentication Credentials on Source and Destination Clusters.
If the existing deployments in the project require a different security profile from the imported process, create a new project into which you can import the source MongoDB deployment.

Examples of Imported Users

The following examples apply to situations where the MongoDB deployment requires authentication or the Ops Manager project has authentication settings enabled.

If you import the MongoDB users and custom roles, once the Ops Manager project begins to manage the MongoDB deployment, the following happens, regardless of the Enforce Consistent Set value:

The Ops Manager project enables authentication, manages imported users and roles, and syncs the new users and roles to all its managed deployments.
The MongoDB deployment's access control is enabled and requires authentication. The MongoDB deployment has all users and roles that the Ops Manager project manages. These users and roles have Synced set to Yes.

If you don't import the MongoDB users and custom roles, once the Ops Manager project begins to manage the MongoDB deployment, the following happens:

If Enforce Consistent Set is set to Yes:

The Ops Manager project enables authentication and doesn't change its managed users and roles.
The MongoDB deployment's access control is enabled and requires authentication.
Ops Manager deletes the non-imported MongoDB users and roles from the deployment.
The MongoDB deployment has all users and roles that the Ops Manager project manages. These users and roles have Synced set to Yes.

If Enforce Consistent Set is set to No:

The Ops Manager project enables authentication and doesn't change its security settings, including users and roles.
The MongoDB deployment's access control is enabled and requires authentication.
The non-imported MongoDB users and roles remain in the MongoDB deployment.
The MongoDB deployment has all users and roles managed by the Ops Manager project. These users and roles have Synced set to Yes.

Prerequisites

If mongod is enabled as a service on the deployment, a race condition might result where systemd starts mongod on reboot, rather than the Automation. To prevent this issue, ensure the mongod service is disabled before you add your deployment to Automation:
1. Verify whether the mongod service is enabled:
  sudo systemctl is-enabled mongod.service
2. If the service is enabled, disable it:
  sudo systemctl disable mongod.service
If the Ops Manager project doesn't have authentication settings enabled but the MongoDB process requires authentication, add the MongoDB Agent user for the Ops Manager project with the appropriate roles. The import process displays the required roles for the user. The added user becomes the project's MongoDB Agent user.
If the Ops Manager project has authentication settings enabled, add the Ops Manager project's MongoDB Agent user to the MongoDB process.
- To find the MongoDB Agent user, click Deployments, then Security, then Users.
- To find the password for the Ops Manager project's MongoDB Agent user, use one of the following methods:
When you add a cluster under Ops Manager, Ops Manager automatically enables log rotation, which could collide with your existing logRotate configuration for mongod or mongos logs. To prevent this collision, do the following:
- Disable your logRotate configuration for mongod or mongos processes.
- Remove the systemLog.logRotate and systemLog.logAppend options from the mongod or mongos process configuration to use the default of Ops Manager.
The import process requires that the authentication credentials and keyfiles are the same on the source and destination clusters. To learn more, see Authentication Credentials on Source and Destination Clusters.
To successfully import an existing replica set to Ops Manager, the instance must be healthy.

Important

If you are adding a sharded cluster, you must create this user through the mongos and on every shard. That is, create the user both as a cluster wide user through mongos as well as a shard local user on each shard.

Procedures

Add MongoDB Processes

To add existing MongoDB processes to Ops Manager:

Navigate to the Deployment page for your project.

If it is not already displayed, select the organization that contains your desired project from the Organizations menu in the navigation bar.
If it is not already displayed, select your desired project from the Projects menu in the navigation bar.
If it is not already displayed, click Deployment in the sidebar.

Click Add and select Existing MongoDB Deployment.

Follow the prompts to add the deployment.

Add Authentication Credentials to your Deployment

After you add existing MongoDB process to Ops Manager, you might have to add authentication credentials for the new deployments if authentication is enabled for the project into which you imported the deployment. See Authentication Use Cases to learn in which situations you must add Automation, Monitoring, or Backup credentials for your new deployment.

If you are adding a deployment that you intend to live migrate to Atlas, you need to add the deployment (and its credentials) only for Monitoring.

Select the authentication mechanism that you want to use:

Add Credentials for Automation

To add credentials for a deployment that will use Automation but didn't use it before you imported it to Ops Manager:

Add the MongoDB Agent user to your databases.

The MongoDB Agent user performs automation tasks for your MongoDB databases. Make sure this MongoDB user has the proper privileges.

Navigate to the Security Settings dialog for your deployment.

If it is not already displayed, select the organization that contains your desired project from the Organizations menu in the navigation bar.
If it is not already displayed, select your desired project from the Projects menu in the navigation bar.
If it is not already displayed, click Deployment in the sidebar.

Click the Security tab.
Click the Settings tab.
Perform one of the following actions:
- If this is your first time configuring TLS, authentication, or authorization settings for this project, click Get Started.
- If you have already configured TLS authentication, or authorization settings for this project, click Edit.

Click Edit Credentials.

Continue through the modal until you see the Configure Ops Manager Agents page.

Add the appropriate credentials:

Add Credentials for Monitoring

To add credentials for a deployment that will not use Automation but will use Monitoring:

Navigate to the Monitoring Settings dialog for your deployment.

If it is not already displayed, select the organization that contains your desired project from the Organizations menu in the navigation bar.
If it is not already displayed, select your desired project from the Projects menu in the navigation bar.
If it is not already displayed, click Deployment in the sidebar.

Click , then click Monitoring Settings next to the deployment for which you want to view monitoring settings.

Click Credentials.

Add the appropriate credentials:

Add Credentials for Backup

To add credentials for a deployment that will not use Automation but will use Backup:

Navigate to the Continuous Backup page for your project.

If it is not already displayed, select the organization that contains your desired project from the Organizations menu in the navigation bar.
If it is not already displayed, select your desired project from the Project menu in the navigation bar.
Click Continuous Backup in the sidebar.

For your deployment, Click , then click Edit Credentials.

Add the appropriate credentials:

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