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Install Portworx on PKS

PKS preparation

Before installing Portworx, let's ensure the PKS environment is prepared correctly.

Portworx prerequisites

Ensure that your PKS cluster meets the minimum requirements for Portworx.

Enable privileged containers and kubectl exec

Ensure that the following options are selected on all plans on the PKS tile:

  • Enable Privileged Containers
  • Disable DenyEscalatingExec (this is useful for using kubectl exec to run pxctl commands)

Enable zero downtime upgrades for Portworx PKS clusters

Use the following steps to add a runtime addon to the Bosh Director to stop the Portworx service.

note

Why is this needed? When stopping and upgrading instances bosh attempts to unmount /var/vcap/store. Portworx has its root filesystem for its OCI container mounted on /var/vcap/store/opt/pwx/oci and the runc container is running using it. So one needs to stop Portworx and unmount /var/vcap/store/opt/pwx/oci in order to allow bosh to proceed with stopping the instances. The addon ensures this is done automatically and enables zero downtime upgrades.

Perform these steps on any machine where you have the bosh CLI.

  1. Create and upload the release.

    Replace director-environment below with the environment which points to the Bosh Director.

    git clone https://github.com/portworx/portworx-stop-bosh-release.git
    cd portworx-stop-bosh-release
    mkdir src
    bosh create-release --final --version=1.0.0
    bosh -e director-environment upload-release
  2. Add the addon to the Bosh Director.

    First, let's fetch your current Bosh Director runtime config:

    bosh -e director-environment runtime-config

    If this is empty, you can simply use the runtime config at runtime-configs/director-runtime-config.yaml.

    If you already have an existing runtime config, add the release and addon in runtime-configs/director-runtime-config.yaml to your existing runtime config.

    Once we have the runtime config file prepared, let's update it in the Director:

    bosh -e director-environment update-runtime-config runtime-configs/director-runtime-config.yaml
  3. Apply the changes.

    After the runtime config is updated, go to your Operations Manager Installation Dashboard and click "Apply Changes". This will ensure bosh will add the addon on all new vm instances.

    If you already have an existing Portworx cluster, you will need to recreate the VM instances using the bosh recreate command.

Installing Portworx

For on-premises clusters, PKS (Pivotal Container Service) supports VMware vSphere.

Architecture

The following diagram gives an overview of the Portworx architecture on vSphere using shared datastores.

  • Portworx runs on each Kubernetes minion/worker.
  • Based on the given spec by the end user, Portworx on each node will create its disk on the configured shared datastores or datastore clusters.
  • Portworx will aggregate all of the disks and form a single storage cluster. End users can carve PVCs (Persistent Volume Claims), PVs (Persistent Volumes) and Snapshots from this storage cluster.
  • Portworx tracks and manages the disks that it creates. In a failure event, if a new VM spins up, Portworx on the new VM will be able to attach to the same disk that was previously created by the node on the failed VM.

Portworx architecture for PKS on vSphere using shared datastores or datastore clusters

Install the Operator

Enter the following kubectl create command to deploy the Operator:

kubectl create -f https://install.portworx.com/?comp=pxoperator

ESXi datastore preparation

Create one or more shared datastore(s) or datastore cluster(s) which is dedicated for Portworx storage. Use a common prefix for the names of the datastores or datastore cluster(s). We will be giving this prefix during Portworx installation later in this guide.

Step 1: vCenter user for Portworx

You will need to provide Portworx with a vCenter server user that will need to either have the full Admin role or, for increased security, a custom-created role with the following minimum vSphere privileges:

  • Datastore
    • Allocate space
    • Browse datastore
    • Low level file operations
    • Remove file
  • Host
    • Local operations
    • Reconfigure virtual machine
  • Virtual machine
    • Change Configuration
    • Add existing disk
    • Add new disk
    • Add or remove device
    • Advanced configuration
    • Change Settings
    • Extend virtual disk
    • Modify device settings
    • Remove disk

If you create a custom role as above, make sure to select "Propagate to children" when assigning the user to the role.

note

All commands in the subsequent steps need to be run on a machine with kubectl access.

Step 2: Create a Kubernetes secret with your vCenter user and password

Update the following items in the Secret template below to match your environment:

  • VSPHERE_USER: Use output of echo '<vcenter-server-user>' | base64

  • VSPHERE_PASSWORD: Use output of echo '<vcenter-server-password>' | base64

    apiVersion: v1
    kind: Secret
    metadata:
    name: px-vsphere-secret
    namespace: kube-system
    type: Opaque
    data:
    VSPHERE_USER: XXXX
    VSPHERE_PASSWORD: XXXX

kubectl apply the above spec after you update the above template with your user and password.

Step 3: Generate the specs

  1. Navigate to Portworx Central and log in, or create an account.

  2. Select Portworx Enterprise from the product catalog and click Continue.

  3. On the Product Line page, choose any option depending on which license you intend to use, then select Continue to start the spec generator.

  4. For Platform, select vSphere. Specify your vCenter IP or host name and the prefix of the datastore that Portworx should use.

  5. For Distribution Name, select Pivotal Container Service (PKS), then click Save Spec to generate the specs.

Apply the specs

Apply the generated specs to your cluster.

kubectl apply -f px-spec.yaml

Monitor the Portworx nodes

  1. Enter the following kubectl get command and wait until all Portworx nodes show as ready in the output:

    kubectl -n kube-system get storagenodes -l name=portworx
  2. Enter the following kubectl describe command with the name of one of the Portworx nodes to show the current installation status for individual nodes:

    kubectl -n kube-system describe storagenode <portworx-node-name>
    Events:
    Type Reason Age From Message
    ---- ------ ---- ---- -------
    Normal PortworxMonitorImagePullInPrgress 7m48s portworx, k8s-node-2 Portworx image portworx/px-enterprise:2.5.0 pull and extraction in progress
    Warning NodeStateChange 5m26s portworx, k8s-node-2 Node is not in quorum. Waiting to connect to peer nodes on port 9002.
    Normal NodeStartSuccess 5m7s portworx, k8s-node-2 PX is ready on this node
    note

    In your output, the image pulled will differ based on your chosen Portworx license type and version.

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