IBM Db2 high-availability cluster for SAP deployment guide

This guide shows you how to set up Google Cloud Platform (GCP) resources for an IBM Db2 (IBM Db2) high-availability (HA) cluster for SAP on the Linux operating system.

These instructions are complementary to the instructions provided by SAP and IBM in IBM Db2 High Availability Solution: IBM Tivoli System Automation for Multiplatforms. Always refer to the latest documentation provided by SAP and IBM when installing and configuring an IBM Db2 HA cluster on GCP.

These instructions are for an IBM Db2 HA cluster that uses IBM Tivoli System Automation for Multiplatforms (TSAMP) to monitor the system and initiate appropriate action if the system becomes unresponsive. The cluster uses the IBM Db2 high-availability disaster recovery (HADR) function to replicate logged data changes to the standby database.

The cluster uses a floating IP address that is implemented by GCP with either a GCP static route or an alias IP address. In this context, the term "floating IP address" is synonymous with the term "virtual IP address", which is used in the SAP documentation.

These instructions show you how to set up an IBM Db2 HA cluster that consists of a primary IBM Db2 server and one secondary or standby IBM Db2 server, each of which are deployed on a separate Compute Engine virtual machine (VM).

This guide is intended for experienced SAP and IBM Db2 users who are familiar with high-availability clusters.

For more information about planning a Db2 HA cluster, see High-availability IBM Db2 clusters in the IBM Db2 for SAP Planning Guide.

Required SAP documentation

The instructions for installing and configuring the SAP and IBM components are provided by SAP in IBM Db2 High Availability Solution: IBM Tivoli System Automation for Multiplatforms.

Read both the SAP and GCP documentation before you start the procedures in these instructions. At various stages of deployment, you might need to refer to both the SAP and GCP documentation.

Prerequisites

Before you create the IBM Db2 high-availability cluster, make sure that the following prerequisites are met:

  • You or your organization has a GCP account and you have created a project for the IBM Db2 HA cluster deployment. For information about creating GCP projects, see Prerequisites in the IBM Db2 for SAP deployment guide.
  • You have a Virtual Private Cloud network on GCP. For instructions on configuring a VPC network and firewall rules, as well as instructions for setting up a NAT gateway or bastion host for IBM Db2 for SAP, see IBM Db2 for SAP deployment guide.

Deploying an IBM Db2 high-availability cluster on GCP

These instructions show you how to deploy two VMs, define a floating IP address, and configure the alias IP address or GCP routes that support the floating IP address. When you need to install the IBM components, you are referred to the SAP documentation.

The main GCP services that you need to set up for an IBM Db2 high-availability cluster are:

  • A VPC network and subnetwork
  • Firewall rules (if you don't use another form of network access control)
  • Compute Engine VMs and persistent disk storage

You also download and use a GCP helper script when you define the custom resource that TSAMP uses to manage switching the floating IP address between hosts. The script enables TSAMP to interact with GCP APIs.

About Deployment Manager

In these instructions, you define the resource options for your installation in a Deployment Manager configuration file template.

Deployment Manager treats all of the resources that are created for your SAP system as a single entity called a deployment. You can view and work with all of the deployments for your project on the Deployments page in the GCP Console.

Be aware of the following behaviors when using Deployment Manager:

  • Deleting a deployment deletes all of the resources associated with the deployment, including the VMs, the persistent disks, and any SAP systems that are installed on the VM.
  • By default, Deployment Manager uses the ACQUIRE resource creation policy. If you specify a VM name that is already in use by another VM in your project, Deployment Manager doesn't create a new VM, but instead adds the existing VM to your new deployment. If your original VM was created by a previous run of Deployment Manager, the VM is associated with two deployments.

    If you then delete the new deployment, the acquired VM is deleted from the deployment that originally created it. To avoid such a scenario, either set the Deployment Manager resource policy to CREATE, or make sure that you use unique resource names in your new deployment.

    For information about the policies you can use while creating resources with Deployment Manager and how to specify them, see the Deployment Manager documentation.

Deploying the VMs for an IBM Db2 HA cluster with Deployment Manager

  1. In Cloud Shell, download the template_ha.yaml configuration file template to your working directory:

    wget https://storage.googleapis.com/sapdeploy/dm-templates/sap_db2/template_ha.yaml
    
  2. To open the Cloud Shell code editor, in the upper-right corner of the Cloud Shell terminal window, click Launch code editor create.

  3. Optionally, rename the template_ha.yaml file to identify the configuration it defines. For example, db2_ha_s123_dh1.yaml.

  4. To open the template_ha.yaml in the code editor, double-click it.

  5. Define the VMs and persistent disks in the template_ha.yaml file. The template_ha.yaml file contains two sections: sap_db2_primary and sap_db2_secondary. Each section contains a set of property-value pairs followed by comments that include less-frequently used properties.

    When you fill out each section, except for the instanceName, zone, and otherHost properties, the definitions for each VM must be identical.

    The following table describes the properties included in each section. To use a property, replace the placeholder text and brackets with the values for your installation.

    Property Data type Description
    instanceName String The name of the VM instance on which you install IBM Db2. The name must be 13 characters or less, specified in lowercase letters, numbers, or hyphens.
    instanceType String The type of Compute Engine virtual machine on which you install IBM Db2. Specify a machine type with two or more vCPUs. For example, n1-standard-4.
    zone String The zone in which you are deploying the IBM Db2 instance. It must be in the same region that you selected for your subnetwork.
    subnetwork String The name of the subnetwork that you created in a previous step. If you are deploying to a shared VPC, specify this value as shared-vpc-project/SUBNETWORK. For example, myproject/network1.
    linuxImage String The name of the Linux operating- system image or image family that you are using with IBM Db2. To specify an image family, add the prefix family/ to the family name. For example, family/rhel-7-sap-apps or family/sles-12-sp3-sap. To specify an image, enter only the image name. For the list of available image families, see the Images page in the GCP Console.
    linuxImageProject String The GCP project that contains the image you are going to use. This project might be your own project or a GCP image project, such as rhel-sap-cloud or suse-sap-cloud. For a list of GCP image projects, see the Images page in the Compute Engine documentation.
    db2SID String The database instance ID.
    db2sidSize Integer The size in GB of /db2/DBSID, which is the root directory of the database instance. The minimum and default values for db2sidSize are both 8 GB.
    db2homeSize Integer The size in GB of /db2/db2db2sid, which is the home directory of the database instance. The minimum and default values for db2homeSize are both 8 GB.
    db2dumpSize Integer The size in GB of /db2/DBSID/db2dump, which holds the dump files from DB2 that are used for diagnosing problems. The minimum and default values for db2dumpSize are both 8 GB.
    db2saptmpSize Integer The size in GB of /db2/DBSID/saptmp, which holds the database temporary table space. The minimum and default values for db2saptmpSize are both 8 GB.
    db2sapdataSize Integer The size of /sapdb/DBSID/sapdata, which holds the database data files. The minimum and default values for db2sapdataSize are both 30 GB.
    db2logSize Integer The size of /db2/DBSID/logdir, which holds the database transaction logs. The minimum and default values for db2logSize are both 8 GB.
    db2backupSize Integer The size of the /db2backup volume. This property is optional. If you set to 0 or omit, no disk is created.
    db2sapdataSSD boolean Specifies whether the data drive uses an SSD persistent disk (Yes) or an HDD persistent disk (No). Yes is the default.
    db2logSSD boolean Specifies whether the log drive uses an SSD persistent disk (Yes) or an HDD persistent disk (No). Yes is the default. SSD is recommended for the log drive.
    usrsapSize Integer Required only if you are installing IBM Db2 to run with SAP NetWeaver on the same VM instance.
    sapmntSize Integer Required only if you are installing IBM Db2 to run with SAP NetWeaver on the same VM instance.
    swapSize Integer Required only if you are installing IBM Db2 to run with SAP NetWeaver on the same VM instance.
    otherHost String The name of the other VM instance in the IBM Db2 HA cluster. The VM instance must be defined in the other set of properties in the same template_ha.yaml file.
    networkTag String Optional. A network tag that represents your VM instance for firewall or routing purposes. If you specify publicIP: No and don't use a network tag, be sure to provide another means of access to the internet.
    publicIP boolean Optional. Determines whether a public IP address is added to your VM instance. The default is Yes.
    serviceAccount String Optional. If you create your own service account with locked down permissions, enter the name of the account here. By default, VMs are deployed using the default project service account. Note that an incorrectly defined service account prevents a successful deployment. The following is an example of a custom service account: myserviceuser@myproject.iam.gserviceaccount.com
    sap_deployment_debug boolean Optional. If this value is set to Yes, the deployment generates verbose deployment logs. Don't turn this setting on unless a Google support engineer asks you to enable debugging.
    post_deployment_script String Optional. Specifies the location of a script to run after the deployment is complete. The script should be hosted on a web server or in a Cloud Storage bucket. The URL should begin with http://, https://, or gs://. Note that this script is executed on all VMs that the template creates. To run it on the master instance only, add a check at the top of your script.

    The following example VM definitions from a template_ha.yaml configuration file create two VMs for an IBM Db2 HA cluster. For each VM, the configuration file directs Deployment Manager to deploy an n1-standard-4 VM that is running an operating system from the SLES 12 SP3 image family. The VM includes all of the directories that are required to run an IBM Db2 HA cluster. Deployment Manager doesn't create the SAP NetWeaver directories, because the directory sizes are set to 0.

    imports:
    - path: https://storage.googleapis.com/sapdeploy/dm-templates/sap_db2/sap_db2.py
    
    resources:
    - name: sap_db2_primary
      type: https://storage.googleapis.com/sapdeploy/dm-templates/sap_db2/sap_db2.py
      properties:
        instanceName: db2-ha-s1
        instanceType: n1-standard-4
        zone: us-central1-c
        subnetwork: example-sap-subnetwork
        linuxImage: family/sles-12-sp3-sap
        linuxImageProject: suse-sap-cloud
        db2SID: DH1
        db2sidSize: 16
        db2dumpSize: 16
        db2saptmpSize: 16
        db2sapdataSize: 50
        db2logSize: 16
        db2backupSize: 50
        db2sapdataSSD: Yes
        db2logSSD: Yes
        usrsapSize: 0
        sapmntSize: 0
        swapSize: 0
        otherHost: db2-ha-s2
    #
    # (Comment section omitted from example)
    #
    - name: sap_db2_secondary
      type: https://storage.googleapis.com/sapdeploy/dm-templates/sap_db2/sap_db2.py
      properties:
        instanceName: db2-ha-s2
        instanceType: n1-standard-4
        zone: us-central1-f
        subnetwork: example-sap-subnetwork
        linuxImage: family/sles-12-sp3-sap
        linuxImageProject: suse-sap-cloud
        db2SID: DH1
        db2sidSize: 16
        db2dumpSize: 16
        db2saptmpSize: 16
        db2sapdataSize: 50
        db2logSize: 16
        db2backupSize: 50
        db2sapdataSSD: Yes
        db2logSSD: Yes
        usrsapSize: 0
        sapmntSize: 0
        swapSize: 0
        otherHost: db2-ha-s1
        
  6. Deploy the VM instance with Deployment Manager.

    gcloud deployment-manager deployments create DEPLOYMENT-NAME --config TEMPLATE-NAME.yaml
    

    Where:

    • DEPLOYMENT-NAME represents a name of your choosing for the current deployment. This name is used to identify this deployment on the Deployments page of the GCP Console.
    • TEMPLATE-NAME represents the name that you gave to the configuration file or, if you didn't change the name of the default file, template_ha.yaml.

    Deployment Manager reads the specifications in the template_ha.yaml file and configures the VM and persistent disks accordingly. The process might take a few minutes. To check the progress of your deployment, follow the steps in the next section.

Verifying deployment

The following steps use Stackdriver Logging, which might incur charges. For more information, see Stackdriver pricing.

  1. Open Stackdriver Logging to check for errors and monitor the progress of the installation.

    Go to Logging

  2. On the Resources tab, select Global as your logging resource. If INSTANCE DEPLOYMENT COMPLETE is displayed for a VM, Deployment Manager processing is complete for the VM.

    Logging display

  3. After VM deployment is complete, connect to each VM by using ssh. From the Compute Engine VM instances page, you can click the SSH button for each VM instance, or you can use your preferred SSH method.

    SSH button on Compute Engine VM instances page.

  4. Change to the root user.

    sudo su -
  5. At the command prompt, enter df -h. Ensure that you see output similar to the following:

    db2-ha-s1:~ # df -h
    Filesystem                     Size  Used Avail Use% Mounted on
    devtmpfs                       7.4G     0  7.4G   0% /dev
    tmpfs                           12G     0   12G   0% /dev/shm
    tmpfs                          7.4G   18M  7.4G   1% /run
    tmpfs                          7.4G     0  7.4G   0% /sys/fs/cgroup
    /dev/sda1                       30G  2.2G   26G   8% /
    /dev/mapper/vg_db2sid-vol       16G   33M   16G   1% /db2/DH1
    /dev/mapper/vg_db2dump-vol      16G   33M   16G   1% /db2/DH1/db2dump
    /dev/mapper/vg_db2sapdata-vol   50G   33M   50G   1% /db2/DH1/sapdata
    /dev/mapper/vg_db2saptmp-vol    16G   33M   16G   1% /db2/DH1/saptmp
    /dev/mapper/vg_db2log-vol       16G   33M   16G   1% /db2/DH1/log_dir
    /dev/mapper/vg_db2home-vol      16G   33M   16G   1% /db2/db2dh1
    /dev/mapper/vg_db2backup-vol    50G   33M   50G   1% /db2backup
    tmpfs                          1.5G     0  1.5G   0% /run/user/1001

If any of the validation steps show that the installation failed:

  1. Correct the error.
  2. On the Deployments page, delete the deployment to clean up the VMs and persistent disks from the failed installation.
  3. Rerun your deployment.

Reserving a floating IP address

You need to select an IP address to use as the floating IP address. You need this IP address later when you set the host VM instance metadata and when you install and configure IBM db2 and the HA cluster.

Depending on whether you choose a route or alias IP implementation type for your floating IP address, the requirements for the floating IP address are different.

If you are using the static route implementation for your floating IP address, the IP address must be outside of your subnetwork IP address range and cannot be used by anything else in your organization's extended networks. Consult with your network admin to determine an appropriate IP address to use.

If you are using the alias IP address implementation for your floating IP address, you must reserve an IP address from the IP address range of the subnetwork that the hosts are using.

For alias IP address implementations only, reserve an alias IP address:

  1. Open a terminal on a host VM or open Cloud Shell.

    Go to Cloud Shell

  2. Reserve an IP address.

    gcloud compute addresses create vip-name --region region --subnet subnet-name \
      --addresses ip-addr-optional

    Specifying the addresses property is optional. If you don't enter an IP address, Compute Engine selects an IP address from your subnetwork for you.

  3. Display and make a note the reserved IP address to use when you install the database server and configure the HA cluster.

    gcloud compute addresses describe vip-name --region=region

    For example:

    db2-ha-s1:~ # gcloud compute addresses describe db2-ha-vip-dh1 --region=us-central1
    address: 10.1.0.30
    addressType: INTERNAL
    creationTimestamp: '2018-11-28T11:34:14.478-08:00'
    description: ''
    id: '6558342813288977241'
    kind: compute#address
    name: db2-ha-vip-dh1
    region: https://www.googleapis.com/compute/v1/projects/solutions-writers/regions/us-central1
    selfLink: https://www.googleapis.com/compute/v1/projects/solutions-writers/regions/us-central1/addresses/db2-ha-vip-dh1
    status: RESERVED
    subnetwork: https://www.googleapis.com/compute/v1/projects/solutions-writers/regions/us-central1/subnetworks/example-sap-   subnetwork

Adding the floating IP address to the metadata for each host VM instance

You specify information about your floating IP address, including your chosen route or alias IP implementation type, as custom metadata for each VM instance in the cluster. For more information about choosing an implementation type for your floating IP address, see Floating IP addresses for IBM Db2 HA clusters on GCP.

Depending on your implementation type, the metadata parameters that you set are different. In the following two sections, follow the instructions in the section that applies to your floating IP address implementation

Setting metadata for a route implementation of the floating IP address

If you are using a route implementation for your floating IP address, use the parameters in the following table and the procedure that follows the table to set the instance metadata.

Parameter Value Purpose
sap_ibm_vip_solution route Indicates that this is a multi-zone deployment that uses a GCP static route to support switching the floating IP address between hosts.
sap_ibm_db2_vip ip-address Specifies the floating IP address that you reserved in the previous step.
sap_ibm_db2_routename route-name Specifies an arbitrary name for the static route. For example, you could use db2-dh1-vip-route
sap_ibm_db2_routenet vpc-network-name Specifies the VPC network that contains the IBM Db2 HA cluster.

To set your instance metadata for a static route implementation of your floating IP address:

  1. Open a terminal on a host VM or open Cloud Shell.

    Go to Cloud Shell

  2. For each host VM instance in the cluster, specify the same metadata for the route implementation of the floating IP address.

    gcloud compute instances add-metadata instance-name \
    --metadata sap_ibm_vip_solution=route,sap_ibm_db2_vip=ip-address,\
    sap_ibm_db2_routename=route-name,sap_ibm_db2_routenet=vpc-network-name \
    --zone instance-zone

Setting metadata for an alias IP address implementation of the floating IP address

If you are using an alias IP address implementation for your floating IP address, use the parameters in the following table and the procedure that follows the table to set the instance metadata.

Parameter Value Purpose
sap_ibm_vip_solution alias Indicates that this is a single-zone deployment that uses a GCP alias IP address to support switching the floating IP address between hosts.
sap_ibm_db2_vip ip-address Specifies the floating IP address that you reserved in the previous step.
sap_ibm_db2_vip_range alias-ip-range-name Optionally, specifies an arbitrary name for the alias IP range. For example, you could use db2-dh1-vip-alias The default value is the subnetwork name.

To set your instance metadata for an alias IP implementation of your floating IP address:

  1. Open a terminal on a host VM or open Cloud Shell.

    Go to Cloud Shell

  2. For each host VM instance in the cluster, specify the same metadata for the alias IP address implementation of the floating IP address.

    gcloud compute instances add-metadata instance-name \
    --metadata sap_ibm_vip_solution=alias,sap_ibm_db2_vip=ip-address,\
    sap_ibm_db2_vip_range=alias-ip-range-name --zone instance-zone

Reviewing or changing your instance metadata

To review the instance metadata that you set.

gcloud compute instances describe instance-name --zone instance-zone

If you need to change your custom metadata.

gcloud compute instances add-metadata instance-name --metadata  parm-name=parm-value

Adding host names and IP addresses to /etc/hosts

During cluster setup, the SAP cluster setup tool validates the host names and internal IP addresses of each host VM and of the floating IP address. To ensure that the validation is successful, add the IP address, host name, and the VPC internal DNS name for each host VM and the floating IP address to the /etc/hosts file on each host VM by using your preferred editor.

For example, as root, the following example updates /etc/hosts:

echo "#Db2 HA floating IP additions" >> /etc/hosts
echo 10.2.0.24 db2-ha-vip-dh1 db2-ha-vip-dh1.c.solutions-writers.internal >> /etc/hosts
echo 10.1.0.3 db2-ha-s1 db2-ha-s1.us-central1-c.c.db2-ha-project.internal >> /etc/hosts
echo 10.1.0.2 db2-ha-s2 db2-ha-s2.us-central1-f.c.db2-ha-project.internal >> /etc/hosts

In the preceding example, the string between the host name and >> on each line is a VPC internal DNS name, which is used by the VPC internal DNS service.

The host VMs use a zonal internal DNS name, which includes a field for the zone. The floating IP address uses a global internal DNS name, which doesn't include a zone field.

For a VM host, you can retrieve the internal DNS name by entering the following command from a terminal on the host VM:

curl "http://metadata.google.internal/computeMetadata/v1/instance/hostname" \
-H "Metadata-Flavor: Google"

For a floating IP address, you can enter it yourself by using the following format.

vip-host-name.c.project-name.internal

After you update the /etc/hosts file, the relevant information in the /etc/hosts file should look similar to the following example:

#Db2 HA floating IP additions
10.2.0.24 db2-ha-vip-dh1 db2-ha-vip-dh1.c.solutions-writers.internal
10.1.0.3 db2-ha-s1 db2-ha-s1.us-central1-c.c.db2-ha-project.internal
10.1.0.2 db2-ha-s2 db2-ha-s2.us-central1-f.c.db2-ha-project.internal

Preparing the operating system

After you have created your VM, prepare the operating system for the IBM Db2 HA cluster.

The requirements are defined by SAP and IBM. The SAP documentation calls for installing software, such as Perl and Korn Shell, that might not be pre-installed on your Compute Engine host VMs.

Check the following documents for the latest requirements:

Installing the database server and creating the IBM Db2 HA cluster

Before you start following the instructions in IBM Db2 High availability solution: IBM Tivoli System Automation for Multiplatforms to install and configure IBM Db2 and the HA cluster, review the overview of the following procedure, paying particular attention to the notes.

To install SAP NetWeaver and the primary application server, see the GCP SAP NetWeaver documentation and the applicable SAP installation guides available from the SAP Help Portal.

The following steps are an overview of the installation procedure. Refer to the SAP documentation for details.

  1. Establish key-based SSH connectivity between the primary and secondary instances and between each instance and itself as described in the SAP documentation. SSH is used by the SAP cluster setup tool. Test all connections on each host. For example, on db2-ha-s1 test both of the following.

    • ssh db2-ha-s1
    • ssh db2-ha-s2
  2. Download or copy the complete SAP media set for Db2 to your VM from the SAP support portal.

  3. On the primary host VM, use the SAP Software Provisioning Manager (SWPM) to install the IBM Db2 database server.

  4. On the secondary host VM, set up the standby database by using a method such as SAP homogeneous system copy.

  5. On both host VMs, install the license files for IBM Db2 and IBM TSAMP. For more information about installing the IBM licenses that you obtained from SAP, see SAP Note 816773 - DB6: Installing an SAP OEM license.

  6. On both host VMs, install the latest version of TSAMP, as supported by your database version and operating system version.

  7. On the primary host VM, use the latest version of the SAP cluster setup tool sapdb2cluster.sh to configure and create the IBM Db2 HA cluster.

  8. After the cluster is created, on the primary host, use the DB2 high-availability instance configuration utility (db2haicu) utility to test that the cluster can failover.

    1. Exit the SAP cluster setup tool and the Korn shell.

    2. On the primary instance, confirm that the primary database server is online.

      lssam

      In the following example excerpt from the lssam output, the primary database instance is online:

      Online IBM.ResourceGroup:db2_db2dh1_db2dh1_DH1-rg Nominal=Online
              '- Online IBM.Application:db2_db2dh1_db2dh1_DH1-rs
                      |- Online IBM.Application:db2_db2dh1_db2dh1_DH1-rs:db2-ha-s1
                      '- Offline IBM.Application:db2_db2dh1_db2dh1_DH1-rs:db2-ha-s2

    3. Switch to the database instance user.

      sudo su - db2sid

    4. Start the db2haicu utility.

      db2haicusid

    5. In the db2haicu interface, select option 5 and follow the prompts.

    6. Exit the db2haicu utility.

    7. On the primary host, check that the secondary host is now online.

      lssam

      In the following example excerpt from the lssam output, the secondary database instance is online:

      Online IBM.ResourceGroup:db2_db2dh1_db2dh1_DH1-rg Nominal=Online
              '- Online IBM.Application:db2_db2dh1_db2dh1_DH1-rs
                      |- Offline IBM.Application:db2_db2dh1_db2dh1_DH1-rs:db2-ha-s1
                      '- Online IBM.Application:db2_db2dh1_db2dh1_DH1-rs:db2-ha-s2

To complete the cluster configuration, follow the instructions in the next section to create a custom TSAMP resource for the floating IP address and associate it in TSAMP with the IBM Db2 instance resource.

Creating a TSAMP custom resource for the floating IP address

To enable TSAMP to manage the floating IP address, you need to create a TSAMP custom resource for it. To enable TSAMP to interact with GCP while managing the floating IP address resource, you need to download and configure a helper script from GCP.

Download the GCP helper script

On each host in the cluster, download the GCP helper script and set its permissions.

  1. On both the primary and standby hosts, as the root user from the /root directory on the primary VM, download the script.

    wget https://storage.googleapis.com/sapdeploy/gceTSAMP/gcp_floating_ip.sh

  2. On both hosts, set the permissions on the script.

    chmod 744 gcp_floating_ip.sh

Create and configure a TSAMP custom resource for your floating IP address

On any one host in the cluster, create and configure a TSAMP custom resources for the floating IP address.

  1. On any one host, use your preferred method to create a configuration file called cluster_res.conf and paste the following text in it after you update the NodeNameList parameter with your host names.

    PersistentResourceAttributes::
      Name="gcp_floating_ip-rs"
      ResourceType=1
      StartCommand="/root/gcp_floating_ip.sh start"
      StopCommand="/root/gcp_floating_ip.sh stop"
      MonitorCommand="/root/gcp_floating_ip.sh status"
      MonitorCommandPeriod=30
      MonitorCommandTimeout=30
      StartCommandTimeout=600
      StopCommandTimeout=600
      UserName="root"
      RunCommandsSync=1
      ProtectionMode=0
      NodeNameList={"host-1","host-2"}

  2. On the primary host as the root user, create the TSAMP custom resource with the following commands.

    export CT_MANAGEMENT_SCOPE=2
    mkrsrc -f cluster_res.conf IBM.Application
    mkrg -l None gcp_floating_ip-rg
    chrg -o Online gcp_floating_ip-rg
    addrgmbr -g gcp_floating_ip-rg -m F IBM.Application:gcp_floating_ip-rs
    rgreq -o start gcp_floating_ip-rg

  3. On the primary host as the root user, confirm that the Db2 instance resource that is online is on the same host as the online floating IP resource.

    lssam

    In the output, the online resources should all be on the same host VMs:

    Online IBM.ResourceGroup:db2_db2dh1_db2dh1_DH1-rg Nominal=Online
            '- Online IBM.Application:db2_db2dh1_db2dh1_DH1-rs
                    |- Online IBM.Application:db2_db2dh1_db2dh1_DH1-rs:db2-ha-s1
                    '- Offline IBM.Application:db2_db2dh1_db2dh1_DH1-rs:db2-ha-s2
    Online IBM.ResourceGroup:gcp_floating_ip.sh_rg Nominal=Online
            '- Online IBM.Application:gcp_floating_ip.sh_rs
                    |- Online IBM.Application:gcp_floating_ip.sh_rs:db2-ha-s1
                    '- Offline IBM.Application:gcp_floating_ip.sh_rs:db2-ha-s2

    If the floating IP address resource isn't online on the same host that the database instance is, move the floating IP address resource.

    rgreq -o move -n host-to-move-from gcp_floating_ip-rg

  4. As the root user on the primary host, establish a relationship in TSAMP between the database instance resource and the floating IP address resource.

    rgreq -o lock gcp_floating_ip-rg
    rgreq -o lock db2_db2sid_db2sid_SID-rg
    mkrel -o NoCondition -p Collocated \
      -S IBM.Application:gcp_floating_ip-rs -G IBM.Application:db2_db2sid_db2sid_SID-rs \
      db2hadr_colo_gcp_floating_ip
    rgreq -o unlock db2_db2sid_db2sid_SID-rg
    rgreq -o unlock gcp_floating_ip-rg

    After you establish a relationship between the database instance resource and the floating IP address resource, you can test failover again, as described in the next section.

Verifying the deployment of your Db2 HA cluster for SAP on GCP

To confirm that the IBM Db2 HA cluster is configured correctly, trigger a failover and check that all of the online resources move from one host VM to the other.

To perform a failover test.

  1. On the primary host as the root user, note which host VM the online resources are currently on.

    lssam

  2. On the primary host, change to the db2 instance user.

    sudo su - db2sid

  3. Start the db2haicu utility.

    db2haicu

  4. In the db2haicu utility interface, trigger a failover by selecting option 5 and following the prompts.

  5. After the db2haicu utility finishes processing, exit the utility.

  6. Switch to the root user.

    sudo su -

  7. Confirm that the online resources have moved to the other host VM.

Performing post-deployment tasks

Before using your IBM Db2 high-availability system on GCP, we recommend that you complete all of the post-installation activities that are documented in IBM Db2 High Availability Solution: IBM Tivoli System Automation for Multiplatforms, including.

  1. Validating the database cluster.

  2. Backing up the TSAMP core policy.

  3. Updating the database fix packs.

  4. Updating Db2 client connections to use the host name and IP address of the floating IP address. For example, update the db2cli.ini file on the SAP ABAP application servers.

If you are using a NAT gateway with your DB2 HA cluster, complete the set up of the NAT gateway, as described in Completing the NAT gateway installation in the IBM Db2 for SAP deployment guide.

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