ibm-mongodb-operator

ibm-mongodb-operator

The ibm-mongodb-operator operator is built to support the IBM Cloud Platform Common Services. It stands up a mongoDB database that is shared by the services within IBM Cloud Platform Common Services.

Supported platforms

Red Hat OpenShift Container Platform 4.2 or newer installed on one of the following platforms:

• Linux x86_64
• Linux on Power (ppc64le)
• Linux on IBM Z and LinuxONE

Operator versions

Prerequisites

Before you install this operator, you need to first install the operator dependencies and prerequisites:

• For the list of operator dependencies, see the IBM Knowledge Center Common Services dependencies documentation.

• For the list of prerequisites for installing the operator, see the IBM Knowledge Center Preparing to install services documentation.

Documentation

To install the operator with the IBM Common Services Operator follow the installation and configuration instructions within the IBM Knowledge Center.

• If you are using the operator as part of an IBM Cloud Pak, see the documentation for that IBM Cloud Pak. For a list of IBM Cloud Paks, see IBM Cloud Paks that use Common Services.
• If you are using the operator with an IBM Containerized Software, see the IBM Cloud Platform Common Services Knowledge Center Installer documentation.

SecurityContextConstraints Requirements

The IBM Common Services MongoDB service supports running with the OpenShift Container Platform 4.3 default restricted Security Context Constraints (SCCs).

Custom SecurityContextConstraints definition:

allowHostDirVolumePlugin: false
allowHostIPC: false
allowHostNetwork: false
allowHostPID: false
allowHostPorts: false
allowPrivilegeEscalation: true
allowPrivilegedContainer: false
allowedCapabilities: null
apiVersion: security.openshift.io/v1
defaultAddCapabilities: null
fsGroup:
  type: MustRunAs
groups:
- system:authenticated
kind: SecurityContextConstraints
metadata:
  annotations:
    kubernetes.io/description: restricted denies access to all host features and requires
      pods to be run with a UID, and SELinux context that are allocated to the namespace.  This
      is the most restrictive SCC and it is used by default for authenticated users.
  creationTimestamp: "2020-06-17T15:06:39Z"
  generation: 1
  name: restricted
  resourceVersion: "6161"
  selfLink: /apis/security.openshift.io/v1/securitycontextconstraints/restricted
  uid: 255a542b-b0ac-11ea-97cc-00000a104120
priority: null
readOnlyRootFilesystem: false
requiredDropCapabilities:
- KILL
- MKNOD
- SETUID
- SETGID
runAsUser:
  type: MustRunAsRange
seLinuxContext:
  type: MustRunAs
supplementalGroups:
  type: RunAsAny
users: []
volumes:
- configMap
- downwardAPI
- emptyDir
- persistentVolumeClaim
- projected
- secret

For more information about the OpenShift Container Platform Security Context Constraints, see Managing Security Context Constraints.

Key Features

Admin Secret

Starting with version 1.1.0, you can now supply your own icp-mongodb-admin secret. The secret must have a user field and a password field and be in the same namespace where mongoDB is going to be created. If you choose not to supply a secret, a random user and password will be created and used. The icp-mongodb-admin secret will persist after uninstalling or removing the MongoDB custom resource so that uninstall and re-install are possible by using the same Persistent Volumes.

Example YAML for creating your own admin secret before installation. The user and password are base64 encrypted.

apiVersion: v1
kind: Secret
metadata:
  name: icp-mongodb-admin
  namespace: ibm-common-services
type: Opaque
data:
  password: SFV6a2NYMkdKa2tBZA==
  user: dGpOcDR5Unc=

Notes

This is designed for use by IBM Common Services only.

The operator does not support updating the CR in version 1.0.0. To make changes to a deployed MongoDB instance, it is best to directly edit the statefulset.

When you deploy MongoDB, it is better to use 3 replicas, especially if you are not backing up your data. It is possible for the data to be corrupted and recovering from a 3-replica deployment is much easier.