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(DOCSP-14708): Added OpenShift instructions for a replica set. (#523)
* (DOCSP-14708): Added Openshift instructions for a replica set. * (DOCSP-14708): Incorporated Zach's feedback. * (DOCSP-14708): Incorporated feedback from Rodrigo and Jack
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‎source/includes/steps-enable-split-horizon-openshift.yaml

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---
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title: "Deploy a replica set with the |k8s-op-short|."
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stepnum: 1
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level: 4
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optional: true
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ref: pre-deploy-replica-set-openshift
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source:
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file: steps-enable-split-horizon.yaml
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ref: pre-deploy-replicaset
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---
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title: "Configure services to ensure connectivity."
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stepnum: 2
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level: 4
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ref: configure-replica-set-services-openshift
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content: |
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a. Paste the following example services into a text editor:
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.. literalinclude:: /reference/k8s/example-openshift-service.yaml
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:linenos:
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:lineno-start: 1
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:emphasize-lines: 12-13, 26-27, 40-41
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.. note::
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If the `spec.selector` has entries that target headless
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services or applications, OpenShift may create a software
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firewall rule explicitly dropping connectivity. Review the
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selectors carefully and consider targeting the stateful set pod
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members directly as seen in the example. Routes in OpenShift
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offer port 80 or port 443. This example service uses
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port 443.
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#. Change the settings to your preferred values.
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#. Save this file with a ``.yaml`` file extension.
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#. To create the services, invoke the following ``kubectl`` command
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on the services file you created:
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.. code-block:: sh
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kubectl apply -f <my-external-services>.yaml
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---
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title: "Configure routes to ensure |tls| terminination passthrough."
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stepnum: 3
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level: 4
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ref: configure-replica-set-routes-openshift
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content: |
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a. Paste the following example routes into a text editor:
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.. literalinclude:: /reference/k8s/example-openshift-route.yaml
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:linenos:
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:lineno-start: 1
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:emphasize-lines: 7, 11-12, 19, 23-24, 31, 35-36
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.. note::
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To ensure the |tls| |sni| negotiation with |mongod| necessary
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for |mongod| to respond with the correct horizon replica set
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topology for the drivers to use, you must set |tls|
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termination passthrough.
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#. Change the settings to your preferred values.
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#. Save this file with a ``.yaml`` file extension.
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#. To create the routes, invoke the following ``kubectl`` command on
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the routes file you created:
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.. code-block:: sh
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kubectl apply -f <my-external-routes>.yaml
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---
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title: "Add Subject Alternate Names to your |tls| certificates."
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level: 4
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stepnum: 4
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optional: true
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ref: remove-tls-existing-replica-sets-openshift
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source:
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file: steps-enable-split-horizon.yaml
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ref: remove-tls-existing-replicasets
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---
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title: "Open your replica set resource |yaml| file."
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level: 4
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stepnum: 5
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ref: open-replica-set-resource-openshift
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---
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title: "Configure your replica set resource |yaml| file."
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stepnum: 6
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level: 4
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ref: configure-replica-set-resource-openshift
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content: |
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Use the following example to edit your replica set resource |yaml|
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file:
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.. literalinclude:: /reference/k8s/example-openshift-replica-set.yaml
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:linenos:
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:lineno-start: 1
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:emphasize-lines: 16-33
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.. note::
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OpenShift clusters require localhost horizons if you intend to use
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the |k8s-op-short| to create each |csr|. If you manually create
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your |tls| certificates, ensure you include localhost in
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the |san-dns| list.
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---
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title: "Change the settings to your preferred values."
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level: 4
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stepnum: 7
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ref: change-replset-resource-openshift
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source:
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file: steps-enable-split-horizon.yaml
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ref: change-replset-resource
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---
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level: 4
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stepnum: 8
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ref: save-object-spec-rs-openshift
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source:
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file: steps-source-deploy-k8s-resource.yaml
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ref: save-object-spec-update
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replacement:
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k8sResource: :term:`replica set`
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---
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title: "Create the necessary |tls| certificates and |k8s| secrets."
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stepnum: 9
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level: 4
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optional: true
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ref: create-certs-openshift
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content: |
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:ref:`Configure TLS for your replica set
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<tls-for-replica-set>`. Create one secret for the MongoDB replica set
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and one for the certificate authority. The |k8s-op-short| uses these
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secrets to place the |tls| files in the pods for MongoDB to use.
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---
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title: "Approve |csr| requests."
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stepnum: 10
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level: 4
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optional: true
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ref: approve-csr-requests-openshift
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content: |
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a. If you do not manually create the |tls| certificates for the
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deployment, check for pending |csr| approval requests:
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.. code-block:: sh
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oc get csr
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#. When the requests come through, approve them:
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.. code-block:: sh
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oc adm certificate approve {certificate-0}.{namespace} ... {certificate-n}.{namespace}
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---
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level: 4
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stepnum: 11
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ref: restart-k8s-deployment-rs-openshift
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source:
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file: steps-source-deploy-k8s-resource.yaml
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ref: restart-k8s-deployment
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replacement:
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k8sResource: :term:`replica set`
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k8sResourceType: replica-set
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---
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title: Test the connection to the replica set.
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level: 4
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stepnum: 12
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ref: k8s-ext-rs-test-conn-openshift
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content: |
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The |k8s-op-short| should deploy the MongoDB replica set,
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configured with the horizon routes created for ingress. After
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the |k8s-op-short| completes the deployment, you may connect with the
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horizon using |tls| connectivity. If the certificate authority is
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not present on your workstation, you can view and copy it from a
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MongoDB pod using the following command:
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.. code-block:: sh
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oc exec -it my-external-0 -- cat /mongodb-automation/ca.pem
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To test the connections, run the following command:
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.. note::
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In the following example, use your replica set names and replace ``{redacted}`` with the domain that you manage.
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.. code-block:: sh
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mongo --host my-external/my-external-0.{redacted}:443,my-external-1.{redacted}:443,my-external-2.{redacted}:443 \
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--tls \
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--tlsAllowInvalidCertificates
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.. warning::
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Don't use the ``--tlsAllowInvalidCertificates`` flag in production.
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In production, share the |k8s| |certauth| files with client tools
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or applications.
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If the connection succeeds, you should see:
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.. code-block:: javascript
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MongoDB Enterprise <my-replica-set>:PRIMARY
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...

‎source/reference/k8s/example-openshift-replica-set.yaml

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---
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apiVersion: mongodb.com/v1
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kind: MongoDB
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metadata:
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name: my-external
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namespace: mongodb
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spec:
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type: ReplicaSet
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members: 3
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version: 4.2.2-ent
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opsManager:
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configMapRef:
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name: {redacted}
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credentials: {redacted}
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persistent: false
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security:
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tls:
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# TLS must be enabled to allow external connectivity
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enabled: true
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authentication:
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enabled: true
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modes: ["SCRAM","X509"]
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connectivity:
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# The "localhost" routes are there just to make sure the localhost
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# TLS SAN is created in the CSR, per OpenShift route requirements.
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# "ocroute" is the configured route in openshift
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replicaSetHorizons:
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- "ocroute": "my-external-0.{redacted}:443"
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"localhost": "localhost:27017"
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- "ocroute": "my-external-1.{redacted}:443"
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"localhost": "localhost:27018"
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- "ocroute": "my-external-2.{redacted}:443"
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"localhost": "localhost:27019"
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...

‎source/reference/k8s/example-openshift-route.yaml

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---
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apiVersion: v1
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kind: Route
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metadata:
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name: my-external-0
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spec:
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host: my-external-0.{redacted}
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to:
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kind: Service
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name: my-external-0
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tls:
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termination: passthrough
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---
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apiVersion: v1
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kind: Route
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metadata:
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name: my-external-1
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spec:
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host: my-external-1.{redacted}
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to:
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kind: Service
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name: my-external-1
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tls:
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termination: passthrough
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---
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apiVersion: v1
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kind: Route
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metadata:
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name: my-external-2
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spec:
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host: my-external-2.{redacted}
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to:
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kind: Service
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name: my-external-2
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tls:
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termination: passthrough
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...
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‎source/reference/k8s/example-openshift-service.yaml

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---
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kind: Service
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apiVersion: v1
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metadata:
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name: my-external-0
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spec:
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ports:
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- name: mongodb
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protocol: TCP
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port: 443
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targetPort: 27017
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selector:
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statefulset.kubernetes.io/pod-name: my-external-0
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---
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kind: Service
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apiVersion: v1
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metadata:
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name: my-external-1
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spec:
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ports:
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- name: mongodb
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protocol: TCP
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port: 443
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targetPort: 27017
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selector:
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statefulset.kubernetes.io/pod-name: my-external-1
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---
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kind: Service
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apiVersion: v1
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metadata:
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name: my-external-2
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spec:
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ports:
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- name: mongodb
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protocol: TCP
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port: 443
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targetPort: 27017
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selector:
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statefulset.kubernetes.io/pod-name: my-external-2
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...

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