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Rancher Kubernetes Engine 2, SUSE Linux Enterprise Server 15 SP2, SAP Data Intelligence 3.1

SAP Data Intelligence 3.1 on Rancher Kubernetes Engine 2

Installation Guide

SAP Data Intelligence 3 is the tool set to govern big amount of data. Rancher Kubernetes Engine (RKE) 2 is the Kubernetes base that makes deploying SAP Data Intelligence 3 easy. This document describes the installation and configuration of RKE 2 from SUSE and SAP Data Intelligence 3.

Disclaimer: The articles and individual documents published in the SUSE Best Practices series were contributed voluntarily by SUSE employees and by third parties. If not stated otherwise inside the document, the articles are intended only to be one example of how a particular action could be taken. Also, SUSE cannot verify either that the actions described in the articles do what they claim to do or that they do not have unintended consequences. All information found in this article has been compiled with utmost attention to detail. However, this does not guarantee complete accuracy. Therefore, we need to specifically state that neither SUSE LLC, its affiliates, the authors, nor the translators may be held liable for possible errors or the consequences thereof.

Author: Dr. Ulrich Schairer, SAP Solutions Architect, SUSE
Author: Kevin Klinger, SAP Solutions Architect, SUSE
Publication Date: 2021-07-26

1 Introduction

This guide describes the on-premises installation of SAP Data Intelligence 3.1 (SAP DI 3.1) on top of Rancher Kubernetes Engine (RKE) 2. In a nutshell, the installation of SAP DI 3.1 consists of the following steps:

  • Installing SUSE Linux Enterprise Server 15 SP2

  • Installing RKE 2 Kubernetes cluster on the dedicated nodes

  • Deploying SAP DI 3.1 on RKE 2 Kubernetes cluster

  • Performing post-installation steps for SAP DI 3.1

  • Testing the installation of SAP DI 3.1

2 Prerequisites

2.1 Hardware requirements

This chapter describes the hardware requirements for installing SAP DI 3.1 on RKE 2 on top of SUSE Linux Enterprise Server 15 SP2. Only the AMD64/Intel 64 architecture is applicable for our use case.

2.1.1 Hardware Sizing

Correct hardware sizing is very important for setting up SAP DI 3.1 on RKE 2.

  • Minimal hardware requirements for a generic SAP DI 3 deployment:

    • At least 7 nodes are needed for the Kubernetes cluster.

    • Minimum sizing of the nodes needs to be as shown below:

      Server RoleCountRAMCPUDisk space

      Management Workstation

      1

      16 GiB

      4

      >100 GiB

      Master Node

      3

      16 GiB

      4

      >120 GiB

      Worker Node

      4

      32 GiB

      8

      >120 GiB

  • Minimal hardware requirements for an SAP DI 3 deployment for production use:

    • At least seven nodes are needed for the Kubernetes cluster.

    • Minimum sizing of the nodes needs to be as shown below:

      Server RoleCountRAMCPUDisk space

      Management Workstation

      1

      16 GiB

      4

      >100 GiB

      Master Node

      3

      16 GiB

      4

      >120 GiB

      Worker Node

      4

      64 GiB

      16

      >120 GiB

  • For more information about the requirements for RKE, read the documentation at:

  • For more detailed sizing information about SAP DI 3, read the "Sizing Guide for SAP Data Intelligence" at:

2.2 Software requirements

The following list contains the software components needed to install SAP DI 3.1 on RKE:

  • SUSE Linux Enterprise Server 15 SP2

  • Rancher Kubernetes Engine 2

  • SAP Software Lifecycle Bridge

  • SAP Data Intelligence 3.1

  • Secure private registry for container images, for example https://documentation.suse.com/sbp/all/single-html/SBP-Private-Registry/index.html

  • Access to a storage solution providing dynamically physical volumes

  • If it is planned to use Vora’s streaming tables checkpoint store, an S3 bucket like object store is needed

  • If it is planned to enable backup of SAP DI 3.1 during installation access to an S3-compatible object store is needed

3 Preparations

4 Installing Rancher Kubernetes Engine 2 cluster

The installation of Rancher Kubernetes Engine 2 cluster is straight forward. After the installation and basic configuration of the operating system the Kubernetes cluster configuration is created on the management host. Subsequently, the Kubernetes cluster will be deployed.

The following sections describe the installation steps in more detail.

4.1 Preparing management host and Kubernetes cluster nodes

All servers in our scenario use SUSE Linux Enterprise 15 SP2 (SLES 15 SP2) on the AMD64/Intel 64 architecture. The documentation for SUSE Linux Enterprise Server can be found at:

4.1.1 Installing SUSE Linux Enterprise Server 15 SP2

On each server in your environment for SAP Data Intelligence 3.1, install SUSE Linux Enterprise Server 15 SP2 as the operating system. This chapter describes all recommended steps for the installation.

Tip
Tip

If you have already set up all machines and the operating system, skip this chapter and follow the instructions in Section 4.2, “Configuring the Kubernetes nodes”.

  • It is recommended to use a static network configuration. During the installation setup, the first time to adjust this is when the registration page is displayed. In the upper right corner, click the button "Network Configuration …​":

    SLES15 SP2 Setup Registration
    Figure 1: SLES Setup Registration Page
  • The Network Settings page is displayed. By default, the network adapter is configured to use DHCP. To change this, click the Button "Edit".

    SLES15 SP2 Setup Network Settings
    Figure 2: SLES Setup Network Settings
  • On the Network Card Setup page, select "Statically Assigned IP Address" and fill in the fields "IP Address", "Subnet Mask" and "Hostname".

    SLES15 SP2 Setup Network Card Setup
    Figure 3: SLES Setup Network Card
  • During the installation, you also need to adjust the extensions that need to be installed. The Container Module is needed to operate RKE 2.

    SLES15 SP2 Setup Extensions
    Figure 4: SLES Setup Extensions
  • As no graphical interface is needed, it is recommended to install a text-based server.

    SLES15 SP2 Setup SystemRole
    Figure 5: SLES Setup System Role
  • To run Kubernetes the swap partition needs to be disabled. To do so, the partition proposal during installation can be adjusted.

    SLES15 SP2 Setup Partitioning Expanded
    Figure 6: SLES Setup Partitioning
  • When opening the Expert Partitioner, the Swap partition needs to be selected to delete it.

    SLES15 SP2 Setup Expert Partitioner
    Figure 7: SLES Setup Expert Partitioner Swap
  • After deleting the swap partition, there will be some space left that can be used to enlarge the main partition. To do so, the resize page can be called.

    SLES15 SP2 Setup Expert Partitioner3
    Figure 8: SLES Setup Expert Partitioner Resize
  • The easiest way to use all the unused space is to select the "Maximum Size" option here.

    SLES15 SP2 Setup Resize Disk
    Figure 9: SLES Setup Resize Disk
  • Next, enable the NTP time synchronization. This can be done when the Clock and Time Zone page shows up during installation. To enable NTP, click the "Other Settings …​" button.

    SLES15 SP2 Setup Clock and Time
    Figure 10: SLES Setup Timezone
  • Select the "Synchronize with NTP Server" option. A custom NTP server address can be added if desired. Ensure to mark the check boxes for "Run NTP as daemon" and "Save NTP Configuration".

    SLES15 SP2 Setup NTP
    Figure 11: SLES Setup NTP
  • When the Installation Settings page is displayed, make sure that:

    • The firewall will be disabled

    • The SSH service will be enabled

    • Kdump status is disabled

    SLES15 SP2 Setup Summary
    Figure 12: SLES Setup Summary
  • To disable Kdump, click its label. This opens the Kdump Start-Up page. On that page, make sure "Disable Kdump" is selected.

    SLES15 SP2 Setup KDump
    Figure 13: SLES Setup Kdump

Finish the installation and proceed to the next chapter.

4.2 Configuring the Kubernetes nodes

For the purpose of this guide, the workstation will be used to orchestrate all other machines via Salt.

4.2.1 Installing and configuring Salt minions

  • First, register all systems to the SUSE Customer Center or an SMT or RMT server to obtain updates during installation and afterward.

    • When using an SMT or RMT server, the address must be specified:

      $ sudo SUSEConnect --url "https://<SMT/RMT-address>"
    • When registering via SUSE Customer Center, use your subscription and e-mail address:

      $ sudo SUSEConnect -r <SubscriptionCode> -e <EmailAddress>
  • The base system is required by all other modules. To start the installation, run:

    $ sudo SUSEConnect -p sle-module-basesystem/15.2/x86_64
  • Before you can use the workstation for orchestration, install and configure Salt on all Kubernetes nodes:

    $ sudo zypper in -y salt-minion
    $ sudo echo "master: <WorkstationIP>" > /etc/salt/minion
    $ sudo systemctl enable salt-minion --now

4.3 Configuring the management workstation

The management workstation is used to deploy and maintain the Kubernetes cluster and workloads running on it.

4.3.1 Installing and configuring Salt masters

It is recommended to use Salt to orchestrate all Kubernetes nodes. You can skip this activity, but this means that every node must be configured manually afterward.

  • To install Salt, run:

    $ sudo zypper in -y salt-master
    $ sudo systemctl enable salt-master --now
  • Make sure all Kubernetes nodes show up when running:

    $ salt-key -L
  • Accept and verify all minion keys:

    $ salt-key -A -y
    $ salt-key -L
  • Since the RKE deployment needs SSH, an ssh key is needed. To generate a new one, run:

    $ ssh-keygen -t rsa -b 4096
  • Distribute the generated key to all other nodes with the command:

    $ ssh-copy-id -i <path to your sshkey> root@<nodeIP>

4.3.2 Configuring Kubernetes nodes

  • Check the status of the firewall and disable it if this is not yet done:

    $ sudo salt '*' cmd.run 'systemctl status firewalld'
    $ sudo salt '*' cmd.run 'systemctl disable firewalld --now'
  • Check the status of Kdump and disable it if this is not yet done:

    $ sudo salt '*' cmd.run 'systemctl status kdump'
    $ sudo salt '*' cmd.run 'systemctl disable kdump --now'
  • Make sure swap is disabled and disable if this is not yet done:

    $ sudo salt '*' cmd.run 'cat /proc/swaps'
    $ sudo salt '*' cmd.run 'swapoff -a'
  • Check the NTP time synchronization and enable it if this is not yet done:

    $ sudo salt '*' cmd.run 'systemctl status chronyd'
    $ sudo salt '*' cmd.run 'systemctl enable chronyd --now'
    $ sudo salt '*' cmd.run 'chronyc sources'
  • Make sure the SSH server is running:

    $ sudo salt '*' cmd.run 'systemctl status sshd'
    $ sudo salt '*' cmd.run 'systemctl enable sshd --now'
  • Activate the needed SUSE modules:

    $ sudo salt '*' cmd.run 'SUSEConnect -p sle-module-containers/15.2/x86_64'
  • Install the packages required to run SAP Data Intelligence:

    $ sudo salt '*' cmd.run 'zypper in -y nfs-client nfs-kernel-server xfsprogs ceph-common open-iscsi'
  • Enable open-iscsid:

    $ sudo salt '*' cmd.run 'systemctl status iscsid'
    $ sudo salt '*' cmd.run 'systemctl enable iscsid --now'

4.4 Installing Rancher Kubernetes Engine 2

To install RKE 2 on the cluster nodes, download the RKE 2 install script and copy it to each of the Kubernetes cluster nodes. The single steps are described in the following sections.

For more detailed information, read the RKE 2 Quick Start guide.

4.4.1 Downloading the RKE 2 install script

To download the RKE 2 install script, run the following command:

$ curl -sfL https://get.rke2.io --output install.sh
$ chmod 0700 install.sh

4.4.2 Deploying RKE 2

Now deploy the Kubernetes cluster:

  • In a first step, deploy the Kubernetes master nodes.

  • The second step is to deploy the worker nodes of the Kubernetes cluster.

  • Finally, configure and test the access to the RKE 2 cluster from the management workstation.

4.4.2.1 Deploying RKE 2 master nodes

This section describes the deployment of the RKE 2 master nodes.

  • Copy the install.sh script you downloaded before to all of your Kubernetes nodes (masters and workers).

    $ export INSTALL_RKE2_TYPE="server"
    $ export INSTALL_RKE2_VERSION=v1.19.8+rke2r1
    $ ./install.sh

    The command above downloads a TAR archive and extracts it to the local machine.

  • Create a first configuration file for the RKE 2 deployment:

    $ sudo mkdir -p /etc/rancher/rke2
    $ sudo cat <<EOF > /etc/rancher/rke2/config.yaml
    disable: rke2-ingress-nginx
    EOF
  • With the following command, start the actual deployment:

    $ sudo systemctl enable --now rke2-server.service
  • For the remaining master nodes, proceed with the command:

    $ sudo mkdir -p /etc/rancher/rke2/
  • Copy the authentication token from the first master node found at /var/lib/rancher/server/token. Save this token for later usage.

  • Create the file /etc/rancher/rke2/config.yaml on the other nodes of the RKE 2 cluster.

    $ sudo cat  <<EOF > /etc/rancher/rke2/config.yaml
    server: https://<ip of first master node>:9345
    token: <add token gained from first master node>
    disable: rke2-nginx-ingress
    EOF
  • Distribute this file to the remaining master and worker nodes.

4.4.2.2 Deploying RKE 2 worker nodes

This section describes the deployment of the RKE 2 worker nodes.

  • If not already done, copy the install script to the worker nodes.

  • Create the file /etc/rancher/rke2/config.yaml for the worker nodes.

  • Set the environment variables to install the RKE 2 worker nodes and execute the install script.

    $ export INSTALL_RKE2_VERSION=v1.19.8+rke2r1
    $ export INSTALL_RKE2_TYPE="agent"
    $ sudo ./install.sh
    $ sudo systemctl enable --now rke2-agent.service
  • You can monitor the installation progress via the systemd journal.

    $ sudo journalctl -f -u rke2-agent
4.4.2.3 Checking the installation
  • Download a matching kubectl version to the management workstation. Below find an example for kubectl version 1.19.8:

    $ curl -LO https://storage.googleapis.com/kubernetes-release/release/v1.19.8/bin/linux/amd64/kubectl
    $ chmod a+x kubectl
    $ sudo cp -av kubectl /usr/bin/kubectl
  • Get the KUBECONFIG file from the first master node and copy it to the management workstation:

    $ scp <first master node>:/etc/rancher/rke2/rke2.yaml <management workstation>:/path/where/kubeconfig/should/be/placed
  • Replace "127.0.0.1" in rke2.yaml with the IP address of the first master node:

    $ sed -e -i 's/127.0.0.1/<ip of first master node>/' rke2.yaml
  • Verify it by running the following command:

    $ export KUBECONFIG=<PATH to your kubeconfig>
    $ kubectl version
    $ kubectl get nodes

Your RKE 2 cluster should now be ready to use.

5 Installing SAP Data Intelligence 3.1

This section describes the installation of SAP DI 3.1 on an RKE 2-powered Kubernetes cluster.

5.1 Preparations

The following steps need to be executed before the deployment of SAP DI 3.1 can start:

  • Create a namespace for SAP DI 3.1.

  • Create an access to a secure private registry.

  • Create a default storage class.

  • Download and install SAP SLCBridge.

  • Download the stack.xml file for provisioning the DI 3.1 installation.

  • Check if the nfsd and nfsv4 kernel modules are loaded and/or loadable on the Kubernetes nodes.

5.1.1 Creating namespace for SAP DI 3.1 in the Kubernetes cluster

Log in your management workstation and create the namespace in the Kubernetes cluster where DI 3.1 will be deployed.

$ kubectl create ns <NAMESPACE for DI 31>
$ kubectl get ns

5.1.2 Creating cert file to access the secure private registry

Create a file named cert that contains the SSL certificate chain for the secure private registry. This imports the certificates into SAP DI 3.1.

$ cat CA.pem > cert
$ kubectl -n <NAMESPACE for DI 31> create secret generic cmcertificates --from-file=cert

5.2 Creating default storage class

To install SAP DI 3.1, a default storage class is needed to provision the installation with physical volumes (PV). Below find an example for a ceph/rbd based storage class that uses the CSI.

  • Create the yaml files for the storage class; contact your storage admin to get the required information.

  • Create config-map:

    $ cat << EOF > csi-config-map.yaml
    ---
    apiVersion: v1
    kind: ConfigMap
    data:
      config.json: |-
        [
          {
            "clusterID": "<ID of your ceph cluster>",
            "monitors": [
              "<IP of Monitor 1>:6789",
              "<IP of Monitor 2>:6789",
              "<IP of Monitor 3>:6789"
            ]
          }
        ]
    metadata:
      name: ceph-csi-config
    EOF
  • Create a secret to access the storage:

    $ cat << EOF > csi-rbd-secret.yaml
    ---
    apiVersion: v1
    kind: Secret
    metadata:
      name: csi-rbd-secret
      namespace: default
    stringData:
      userID: admin
      userKey: AQCR7htglvJzBxAAtPN0YUeSiDzyTeQe0lveDQ==
    EOF
  • Download the file:

    $ curl -LO https://raw.githubusercontent.com/ceph/ceph-csi/master/deploy/rbd/kubernetes/csi-rbdplugin-provisioner.yaml
  • Download the file:

    $ curl -LO https://raw.githubusercontent.com/ceph/ceph-csi/master/deploy/rbd/kubernetes/csi-rbdplugin.yaml
  • Create a pool on the Ceph storage where the PVs will be created, and insert the poolname and the Ceph cluster ID:

    $ cat << EOF > csi-rbd-sc.yaml
    ---
    apiVersion: storage.k8s.io/v1
    kind: StorageClass
    metadata:
       name: csi-rbd-sc
    provisioner: rbd.csi.ceph.com
    parameters:
       clusterID: <your ceph cluster id>
       pool: <your pool>
       csi.storage.k8s.io/provisioner-secret-name: csi-rbd-secret
       csi.storage.k8s.io/provisioner-secret-namespace: default
       csi.storage.k8s.io/node-stage-secret-name: csi-rbd-secret
       csi.storage.k8s.io/node-stage-secret-namespace: default
    reclaimPolicy: Delete
    mountOptions:
       - discard
    EOF
  • Create config for encryption. This is needed, else the deployment of the CSI driver for ceph/rbd will fail.

    $ cat << EOF > kms-config.yaml
    ---
    apiVersion: v1
    kind: ConfigMap
    data:
      config.json: |-
        {
          },
          "vault-tokens-test": {
              "encryptionKMSType": "vaulttokens",
              "vaultAddress": "http://vault.default.svc.cluster.local:8200",
              "vaultBackendPath": "secret/",
              "vaultTLSServerName": "vault.default.svc.cluster.local",
              "vaultCAVerify": "false",
              "tenantConfigName": "ceph-csi-kms-config",
              "tenantTokenName": "ceph-csi-kms-token",
              "tenants": {
                  "my-app": {
                      "vaultAddress": "https://vault.example.com",
                      "vaultCAVerify": "true"
                  },
                  "an-other-app": {
                      "tenantTokenName": "storage-encryption-token"
                  }
              }
           }
        }
    metadata:
      name: ceph-csi-encryption-kms-config
    EOF
  • Deploy the ceph/rbd CSI and storage class:

    $ kubectl apply -f csi-config-map.yaml
    $ kubectl apply -f csi-rbd-secret.yaml
    $ kubectl apply -f \
      https://raw.githubusercontent.com/ceph/ceph-csi/master/deploy/rbd/kubernetes/csi-provisioner-rbac.yaml
    $ kubectl apply -f \
      https://raw.githubusercontent.com/ceph/ceph-csi/master/deploy/rbd/kubernetes/csi-nodeplugin-rbac.yaml
    $ kubectl apply -f csi-rbdplugin-provisioner.yaml
    $ kubectl apply -f csi-rbdplugin.yaml
    $ kubectl apply -f csi-rbd-sc.yaml
    $ kubectl apply -f kms-config.yaml
    $ kubectl patch storageclass csi-rbd-sc \
      -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'
  • Check your storage class:

    $ kubectl get sc
    NAME                   PROVISIONER        RECLAIMPOLICY   VOLUMEBINDINGMODE   ALLOWVOLUMEEXPANSION   AGE
    csi-rbd-sc (default)   rbd.csi.ceph.com   Delete          Immediate           false                  103m

5.3 Using Longhorn for physical volumes

A possible valid alternative is to deploy Longhorn storage for serving the PVs of SAP DI 3. For more information, visit https://longhorn.io.

Longhorn uses the CSI for accessing the storage.

5.3.1 Prerequisites

Each node in the Kubernetes cluster where Longhorn is installed must fulfill the following requirements:

  • A matching Kubernetes version (this is because we are installing SAP DI 3)

  • open-iscsi

  • Support for the XFS file system

  • nfsv4 client must be installed

  • curl, lsblk, blkid, findmnt, grep, awk must be installed

  • Mount propagations must be enabled on Kubernetes cluster

A check script provided by Longhorn project can be installed on the management workstation.

$ curl -sSfL https://raw.githubusercontent.com/longhorn/longhorn/v1.1.0/scripts/environment_check.sh | bash

On the Kubernetes worker nodes that should act as storage nodes, add sufficient disk drives. Create mount points for these disks, then create the XFS file system on top, and mount them. Longhorn will be configured to use these disks for storing data. For detailed information about disk sizes, see the SAP Sizing Guide for SAP DI 3.

Make sure as well that iscsid is started on the Longhorn nodes:

$ sudo systemctl enable --now iscsid

5.3.2 Installing Longhorn

The installation of Longhorn is straight forward. This guide follows the documentation of Longhorn which can be found at https://longhorn.io/docs/1.1.0/.

  • Start the deployment with the command:

    $ kubectl apply -f https://raw.githubusercontent.com/longhorn/longhorn/v1.1.0/deploy/longhorn.yaml
  • Monitor the deployment progress with the following command:

    $ kubectl get pods \
      --namespace longhorn-system \
      --watch

5.3.3 Configuring Longhorn

The Longhorn storage administration is done via a built-in UI dashboard. To access this UI, an Ingress needs to be configured.

5.3.3.1 Creating an Ingress with basic authentication
  • Create a basic auth file:

    $ USER=<USERNAME_HERE>; \
      PASSWORD=<PASSWORD_HERE>; \
      echo "${USER}:$(openssl passwd -stdin -apr1 <<< ${PASSWORD})" >> auth
  • Create a secret from the file auth:

    $ kubectl -n longhorn-system create secret generic basic-auth --from-file=auth
  • Create the Ingress with basic authentication:

    $ cat <<EOF > longhorn-ingress.yaml
    apiVersion: networking.k8s.io/v1beta1
    kind: Ingress
    metadata:
      name: longhorn-ingress
      namespace: longhorn-system
      annotations:
        # type of authentication
        nginx.ingress.kubernetes.io/auth-type: basic
        # prevent the controller from redirecting (308) to HTTPS
        nginx.ingress.kubernetes.io/ssl-redirect: 'false'
        # name of the secret that contains the user/password definitions
        nginx.ingress.kubernetes.io/auth-secret: basic-auth
        # message to display with an appropriate context why the authentication is required
        nginx.ingress.kubernetes.io/auth-realm: 'Authentication Required '
    spec:
      rules:
      - http:
          paths:
          - path: /
            backend:
              serviceName: longhorn-frontend
              servicePort: 80
    EOF
    
    $ kubectl -n longhorn-system apply -f longhorn-ingress.yaml
5.3.3.2 Adding disk space for Longhorn

This section describes how to add disk space to the Longhorn implementation.

  • Prepare the disks:

    • Create a mount point for the disks.

    • Create a partition and file system on the disk.

    • Mount the file system of the disk to the created mount point.

    • Add an entry for this file system to fstab.

    • Test this setup (for example: umount file system, run mount -a, check with lsblk if file system is mounted properly)

  • Configure additional disks using the Longhorn UI:

    • Access the UI of Longhorn through the URL configured in the Ingress (for example "http://node:").

    • Authenticate with the user and password set in the previous chapter.

      longhorn dashboard
      Figure 14: Longhorn UI Overview

      On this Overview page, click the nodes tab.

      longhorn dash nodes
      Figure 15: Longhorn UI Nodes
    • Hover over the settings icon on the right side.

      longhorn dash nodes edit
      Figure 16: Longhorn UI Edit node
  • Click "Edit Node and Disks".

    longhorn dash add disk1
    Figure 17: Longhorn UI Add disk
  • Click the "Add Disks" button.

    longhorn dash disk2
    Figure 18: Longhorn UI disk save
    • Fill in the mount point and mark it as schedulable.

    • Click "Save".

  • Repeat this for other disks on the other nodes.

  • Check the status in the UI of Longhorn:

    • Point the browser to the URL defined in the Ingress.

    • Authenticate with the user and password created above.

  • The UI displays an overview of the Longhorn storage.

For more details, see the Longhorn documentation

5.3.4 Creating a Storage Class on top of Longhorn

The following command creates a storage class named longhorn for the use of SAP DI 3.1.

$ kubectl create -f https://raw.githubusercontent.com/longhorn/longhorn/v1.1.0/examples/storageclass.yaml

Annotate this storage class as default:

$ kubectl patch storageclass longhorn \
  -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'

5.3.5 Longhorn documentation

For more details, see the Longhorn documentation.

5.4 Using NetApp Trident and NetApp StorageGRID as block and object store

5.4.1 Installing NetApp Trident

Install NetApp Trident according to the documentation at https://netapp-trident.readthedocs.io/en/stable-v21.01/:

  • Create a storage class on top of NetApp Trident and make it the default storage class.

  • Create an igroup and add the initator names from the RKE 2 worker nodes:

    • Log in to the RKE2 worker nodes and query the initiator names from /etc/iscsi/initiator.iscsi.

    • Make sure the initiator names are unique! If they are not, replace them with new ones, generated with iscsi-iname.

    • Create an igroup inside your vserver and add all initator names.

5.4.2 Installing NetApp StorageGRID

If an SAP Data Intelligence checkpoint store must be used, or AI/ML scenarios should be used, an object store is required. To use StorageGRID as an object store for SAP Data Intelligence, complete the following installation (if StorageGRID is not used as an appliance) and configuration steps:

5.5 Downloading the SLC Bridge

The SLC Bridge can be obtained:

Download the SLC Bridge software to the management workstation.

5.6 Installing the SLC Bridge

Rename the SLC Bridge binary to slcb and make it executable. Deploy the SLC Bridge to the Kubernetes cluster.

$ mv SLCB01_XX-70003322.EXE slcb
$ chmod 0700 slcb
$ export KUBECONFIG=<KUBE_CONFIG>
$ ./slcb init

During the interactive installation, the following information is needed:

  • URL of secure private registry

  • Choose expert mode

  • Choose NodePort for the service

Take a note of the service port of the SLC Bridge. It is needed for the installation of SAP DI 3.1 or for the reconfiguration of DI 3.1, for example to enable backup. If you forgot to note it down, the following command will list the service port:

$ kubectl -n sap-slcbridge get svc

5.7 Creating and downloading Stack XML for the SAP DI installation

Follow the steps described in the chapter Install SAP Data Intelligence with SLC Bridge in a Cluster with Internet Access of the SAP DI 3.1 Installation Guide.

5.7.1 Creating Stack XML

You can create the Stack XML via the SAP Maintenance Planner. Access the tool via https://support.sap.com/en/alm/solution-manager/processes-72/maintenance-planner.html. Go to the Maintenance Planner at https://apps.support.sap.com/sap/support/mp published on the SAP Web site and generate a Stack XML file with the container image definitions of the SAP Data Intelligence release that you want to install. Download the Stack XML file to a local directory. Copy stack.xml to the management workstation.

5.8 Running the installation of SAP DI

The installation of SAP DI 3.1 is invoked by:

$ export KUBECONFIG=<path to kubeconfig>
$ ./slcb execute --useStackXML MP_Stack_XXXXXXXXXX_XXXXXXXX_.xml --url https://<node>:<service port>/docs/index.html

This starts an interactive process for configuring and deploying SAP DI 3.1.

The table below lists some parameters available for an SAP DI 3.1 installation:

ParameterConditionRecommendation

Kubernetes Namespace

Always

set to namespace created beforehand

Installation Type

installation or update

either

Container Registry

Always

add the uri for the secure private registry

Checkpoint Store Configuration

installation

whether to enable Checkpoint Store

Checkpoint Store Type

if Checkpoint Store is enabled

use S3 object store from SES

Checkpoint Store Validation

if Checkpoint is enabled

Object store access will be verified

Container Registry Settings for Pipeline Modeler

optional

used if a second container registry is used

StorageClass Configuration

optional, needed if a different StorageClass is used for some components

leave the default

Default StorageClass

detected by SAP DI installer

The Kubernetes cluster shall have a storage class annotated as default SC

Enable Kaniko Usage

optional if running on Docker

enable

Container Image Repository Settings for SAP Data Intelligence Modeler

mandatory

 

Container Registry for Pipeline Modeler

optional

Needed if a different container registry is used for the pipeline modeler images

Loading NFS Modules

optional

Make sure that nfsd and nfsv4 kernel modules are loaded on all worker nodes

Additional Installer Parameters

optional

 

For more details about input parameters for an SAP DI 3.1 installation, visit the section Required Input Parameters of the SAP Data Intelligence Installation Guide.

5.9 Post-installation tasks

After the installation workflow is successfully finished, you need to carry out some more tasks:

  • Obtain or create an SSL certificate to securely access the SAP DI installation:

    • Create a certificate request using openssl, for example:

      $ openssl req -newkey rsa:2048 -keyout <hostname>.key -out <hostname>.csr
    • Decrypt the key:

      $ openssl rsa -in <hostname>.key -out decrypted-<hostname>.key
    • Let a CA sign the <hostname>.csr You will receive a <hostname>.crt.

    • Create a secret from the certificate and the key in the SAP DI 3 namespace:

      $ export NAMESPACE=<SAP DI 3 namespace>
      $ kubectl -n $NAMESPACE create secret tls vsystem-tls-certs --key  decrypted-<hostname>.key--cert <hostname>.crt
  • Deploy an nginx-ingress controller

    • For more information, see https://kubernetes.github.io/ingress-nginx/deploy/#bare-metal

    • Create the nginx-ingress controller as a nodePort service according to the Ingress nginx documentation:

      $ kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v0.46.0/deploy/static/provider/baremetal/deploy.yaml
    • Determine the port the nginx controller is redirecting HTTPS to:

      $ kubectl -n ingress-nginx get svc ingress-nginx-controller

      The output should be similar to the below:

      kubectl -n ingress-nginx get svc ingress-nginx-controller
      NAME                       TYPE       CLUSTER-IP    EXTERNAL-IP   PORT(S)                      AGE
      ingress-nginx-controller   NodePort   10.43.86.90   <none>        80:31963/TCP,443:31106/TCP   53d

      In our example here, the TLS port is be 31106. Note the port IP down as you will need it to access the SAP DI installation from the outside.

  • Create an Ingress to access the SAP DI installation:

    $ cat <<EOF > ingress.yaml
    apiVersion: extensions/v1beta1
    kind: Ingress
    metadata:
      annotations:
        kubernetes.io/ingress.class: nginx
        nginx.ingress.kubernetes.io/force-ssl-redirect: "true"
        nginx.ingress.kubernetes.io/secure-backends: "true"
        nginx.ingress.kubernetes.io/backend-protocol: HTTPS
        nginx.ingress.kubernetes.io/proxy-body-size: "0"
        nginx.ingress.kubernetes.io/proxy-buffer-size: 16k
        nginx.ingress.kubernetes.io/proxy-connect-timeout: "30"
        nginx.ingress.kubernetes.io/proxy-read-timeout: "1800"
        nginx.ingress.kubernetes.io/proxy-send-timeout: "1800"
      name: vsystem
    spec:
      rules:
      - host: "<hostname FQDN must match SSL certificate"
        http:
          paths:
          - backend:
              serviceName: vsystem
              servicePort: 8797
            path: /
      tls:
      - hosts:
        - "<hostname FQDN must match SSL certificate>"
        secretName: vsystem-tls-certs
    EOF
    $ kubectl apply -f ingress.yaml
  • Connecting to https://hostname:<ingress service port> brings up the SAP DI login dialog.

5.10 Testing the SAP DaP Data Intelligence 3 installation

Finally, the SAP DI 3 installation should be verified with some very basic tests:

  • Log in to SAP DI’s launchpad

  • Create example pipeline

  • Create ML Scenario

  • Test machine learning

  • Download vctl

For details, see the SAP DI 3 Installation Guide

6 Maintenance tasks

This section provides some tips about what should and could be done to maintain the Kubernetes cluster, the operating system and the SAP DI 3 deployment.

6.1 Backup

It is good practice to keep backups of all relevant data to be able to restore the environment in case of a failure.

To perform regular backups, follow the instructions as outlined in the respective documentation below:

6.2 Upgrade or update

This section explains how you can keep your installation of SAP DI, RKE 2 and SUSE Linux Enterprise Server up-to-date.

6.2.1 Updating the operating system

To obtain updates for SUSE Linux Enterprise Server 15 SP2, the installation must be registered either to SUSE Customer Center, an SMT or RMT server, or SUSE Manager with a valid subscription.

  • SUSE Linux Enterprise Server 15 SP2 can be updated on the command line using zypper:

    $ sudo zypper ref -s
    $ sudo zypper lu
    $ sudo zypper patch
  • Other methods for updating SUSE Linux Enterprise Server 15 SP2 are described in the product documentation.

If an update requires a reboot of the server, make sure that this can be done safely.

  • For example, block access to SAP DI, and drain and cordon the Kubernetes node before rebooting:

    $ kubectl edit ingress <put in some dummy port>
    $ kubectl drain <node>
  • Check the status of the node:

    $kubectl get node <node>

    The node should be marked as not schedulable.

  • On RKE 2 master nodes, run the command:

    $ sudo systemctl stop rke2-server
  • On RKE 2 worker nodes, run the command:

    $ sudo systemctl stop rke2-agent
  • Update SUSE Linux Enterprise Server 15 SP2:

    $ ssh node
    $ sudo zypper patch
  • Reboot the nodes if necessary or start the appropriate RKE 2 service.

    • On master nodes, run the command:

      $ sudo systemctl start rke2-server
    • On worker nodes, run the command:

      $ sudo systemctl start rke2-agent
  • Check if the respective nodes are back and uncordon them.

    $ kubectl get nodes
    $ kubectl uncordon <node>

6.2.2 Updating RKE 2

For an update of RKE 2, first read

Then perform the following actions:

6.2.3 Updating SAP Data Intelligence

For an update of SAP DI 3.1., follow SAP’s update guide and notes:

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ADDENDUM: How to use this License for your documents

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