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In this tutorial, you deploy a highly available IBM Db2 cluster inGoogle Cloud. You use High Availability Disaster Recovery (HADR)for transaction replication and Tivoli System Automation for Multiplatforms(TSAMP) for automated failover.

Db2 11.5 Knowledge Center

This tutorial is useful if you are a system admin, developer, engineer, ordatabase admin and you want to deploy a highly available Db2 cluster onCompute Engine.

The tutorial assumes that you are familiar with the following:

  • Red Hat Enterprise Linux 7
  • IBM Db2 11.1
  • Compute Engine
  • Cloud Storage
Note: In this tutorial you use a fully featured 90-day trial of Db2 for Linux.After the trial period ends, youcanselect the required Db2 edition when purchasing and installing the associated license files.

Architecture

The following architectural diagram illustrates your environment.

  • There are two Db2 instances. db2-a is the primary instance anddb2-b is the standby instance. These instances are in two differentzones.
  • There is a client instance, db2-client, in a different zone.
  • Transactions from the primary instance are replicated to the standbyinstance by usingHADR SYNC replication.
  • The cluster uses TSAMP for failover automation.
  • You use Google Cloud's metadata server as a TSAMP network quorum.
  • The cluster uses ACR to remain highly available after a failover.

Key terms

IBM Db2
An enterprise grade RDBMS (relational database management system), withreplication and failover capabilities.
HADR (High Availability Disaster Recovery)
A capability for Db2 that uses database logged activity to replicate data fromthe primary database to the standby. It also allows to manually fail overfrom the primary database to the standby database.
TSAMP (Tivoli System Automation for Multiplatforms)
A cluster management software that facilitates automatic switching of users,apps, and data from one database system to another in a cluster. Db2enterprise edition comes with TSAMP entitlement for HADR included.
ACR (Automatic Client Reroute)
A Db2 feature that seamlessly redirects client apps from a failedserver to an alternate server so that the apps can continue workingwith minimal interruption.

Objectives

  • Install Db2 on the two Compute Engine instances.
  • Configure HADR and ACR on both instances.
  • Configure TSAMP on both instances.
  • Install Db2 Client Runtime Libraries on the client instance.
  • Verify that ACR and TSAMP work properly.

Costs

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This tutorial uses the following billable components of Google Cloud:

To generate a cost estimate based on your projected usage, use the pricing calculator. New Google Cloud users might be eligible for a free trial.

Before you begin

  1. Sign in to your Google Cloud account. If you're new to Google Cloud,create an account to evaluate how our products perform in real-world scenarios. New customers also get $300 in free credits to run, test, and deploy workloads.
  2. In the Google Cloud Console, on the project selector page, select or create a Google Cloud project.

    Note: If you don't plan to keep the resources that you create in this procedure, create a project instead of selecting an existing project. After you finish these steps, you can delete the project, removing all resources associated with the project.
  3. Make sure that billing is enabled for your Cloud project. Learn how to confirm that billing is enabled for your project.

  4. Enable the Compute Engine API.
  5. In the Google Cloud Console, on the project selector page, select or create a Google Cloud project.

    Note: If you don't plan to keep the resources that you create in this procedure, create a project instead of selecting an existing project. After you finish these steps, you can delete the project, removing all resources associated with the project.
  6. Make sure that billing is enabled for your Cloud project. Learn how to confirm that billing is enabled for your project.

  7. Enable the Compute Engine API.

When you finish this tutorial, you can avoid continued billing by deleting the resources you created. For more information, seeClean up.

Downloading the Db2 11.1 data server trial installation file

  1. Download IBM DB2 database.

  2. Log in with your IBM account ID or sign up for a new account.

  3. Click the Download using http tab.

  4. Download DB2 11.1 data server trial for Linux® on AMD64 and Intel®EM64T systems (x64)

Downloading the Db2 Client Runtime installation file

  1. Go to theIBM Data Server Runtime Client Download Page.Use the same credentials from the previous section to log in.

  2. Click IBM Data Server Runtime Client (Linux AMD64 and Intel EM64T)version 11.1, and then click Continue.

  3. On the Download using http tab, click Download now.

Preparing your environment

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  1. In the Google Cloud Console, click Activate Cloud Shell.

  2. Create a service account.

  3. Add the storage.objectEditor role to the db2-instance service account.

    This role is required to view and download files from theCloud Storage bucket.

  4. Create a Db2 instance called db2-a.

  5. Create another Db2 instance called db2-b.

  6. Create the client instance called db2-client.

  7. Enable Db2 communication between the instances.

  8. Enable communication between the client and the Db2 instances.

  9. Enable TSAMP communication between the two Db2 instances.

Setting up a Cloud Storage bucket

You create a Cloud Storage bucket to hold the Db2 installation andbackup files that are used throughout this tutorial.

  1. Use gsutil to create a Cloud Storage bucket, where[GCS_BUCKET_NAME] represents the name of the bucket. For the purpose ofthis tutorial, use the us-central1region.

  2. In the Cloud Console,upload your Db2 installation file to your new Cloud Storage bucket.

  3. In the Cloud Console,upload your Db2 Client Runtime installation file to your new Cloud Storage bucket.

Setting up Db2 on the db2-a instance

To set up the db2-a instance, you have to create users and user groups beforeinstalling DB2 on the primary instance.

Prepare the db2-a instance

You create the required users and groups and install the prerequisite softwarepackages on the primary instance.

  1. In the Cloud Console, go to the VM instances page.

  2. In the db2-a instance row, click SSH.

    Note: Throughout this tutorial, you connect to various instances.Repeat the preceding two steps to connect to each instance in theCloud Console by using ssh.
  3. Add the required user groups. For more information about users andgroups, seeCreating group and user IDs for Db2 installation.

  4. Add the required users.

  5. Set the password for the Db2 instance user. For the purpose of thistutorial, use [email protected]

  6. Update the swappiness parameter. For more information, seeKernel parameter requirements.

  7. Install the prerequisites.

  8. Create the installation directory.

  9. Copy your db2 installation file.

    Where:

    [GCS_BUCKET_NAME] represents the Cloud Storage bucket you createdat the beginning of this tutorial.

Install Db2 on the db2-a instance

  1. Create a Db2 installation parameters file.

  2. Unzip the installation file.

  3. Create the Db2 working directories.

  4. Assign ownership to the working directories.

  5. Launch the Db2 installer.

  6. Start the database instance.

Setting up Db2 on the db2-b instance

You now create the required users and groups and install the prerequisitesoftware packages on the standby instance.

Prepare the db2-b instance

  1. In the Cloud Console, use ssh to connect to the db2-binstance.

  2. Add the required user groups:

  3. Add the users.

  4. Set the password for the Db2 instance user. For the purpose of thistutorial, use [email protected].

  5. Update the swappiness parameter.

  6. Instal the prerequisites.

  7. Create the installation directories.

  8. Copy your Db2 installation file.

    Where:

    [GCS_BUCKET_NAME] represents the bucket you created at the beginning of thistutorial.

Install Db2 on the db2-b instance

  1. Create a Db2 installation parameters file.

  2. Unzip the installation file.

  3. Create the Db2 working directories.

  4. Assign ownership to the working directories.

  5. Launch the Db2 installer.

  6. Start the database instance.

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Copying the database from the db2-a instance to the db2-b instance

You create a database on the db2-a instance, configure it for transactionlogging, and then back it up and restore it on the db2-b instance.

  1. In the Cloud Console, use ssh to connect to the db2-ainstance.

  2. Create the database.

  3. Enable log archiving.

  4. Back up the database.

  5. Copy the backup to your Cloud Storage bucket.

  6. In the Cloud Console, use ssh to connect to the db2-binstance.

  7. Download the backup file.

  8. Restore the database from the backup file.

Configuring HADR on the db2-a instance

You now configure all of the HADR parameters on the primary instance. This isrequired to start the replication process later.

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  1. In the Cloud Console, use ssh to connect to the db2-ainstance.

  2. Specify the HADR primary, db2-a, and standby, db2-b, servers.

  3. Specify the HADR primary and standby service names.

  4. Specify the Db2 instance name for the standby server.

  5. Specify the time (in seconds) that the HADR process waits beforeconsidering a communication attempt to have failed. For more informationabouthadr_timeout, seeSetting the hadr_timeout and hadr_peer_window database configuration parameters.

  6. Set the HADR synchronization mode to synchronous replication.

    Note: You can choose a different replication type.
  7. Enable replication of index operations.

  8. Specify the time (in seconds) that the primary instance waits for thestandby to come back online after it loses connection:

    Note: In this tutorial, you set this value to 300 seconds, but you canchoose other values based on your deployment.
  9. Set up automatic client reroute.

  10. Prepare the server for TSAMP clustering.

  11. Verify your configuration values.

    The output is:

Configuring HADR on the db2-b instance

You now configure all of the HADR parameters on the standby instance. This isrequired to start the replication process later.

  1. In the Cloud Console, use ssh to connect to the db2-binstance.

  2. Specify the HADR primary, db2-a, and standby, db2-b, servers.

  3. Specify the HADR primary and standby service names.

  4. Specify the Db2 instance name for the primary server.

  5. Specify the time (in seconds) that the HADR process waits beforeconsidering a communication attempt to have failed.

  6. Specify the HADR synchronization mode.

  7. Enable replication of index operations.

  8. Specify the time (in seconds) that the primary instance waits for thestandby to come back online after it loses connection.

  9. Set up automatic client reroute.

  10. Prepare the server for TSAMP clustering.

  11. Verify your configuration values.

    The output is:

Starting HADR

After configuring the two instances for their HADR roles, you now start thereplication.

  1. In the Cloud Console, use ssh to connect to the db2-binstance.

  2. Deactivate the database.

  3. Start HADR as the standby instance.

  4. Verify the role is Standby.

    The output is:

  5. In the Cloud Console, use ssh to connect to the db2-ainstance.

  6. Activate the database.

  7. Start HADR as primary.

  8. Verify that the role is Primary.

    The output is:

  9. Create a data population script.

  10. Create and populate the table.

  11. In the Cloud Console, use ssh to connect to the db2-binstance.

  12. Initiate a takeover. db2-b becomes the primary instance so youcan determine if the test table and data have been replicated.

  13. Verify that the role of the db2-b instance is Primary.

    The output is:

  14. Verify the replicated data on the standby instance.

    The output shows the first 10 lines of the table and indicates there are5000 rows in total:

Setting up TSAMP on the db2-a instance

The db2-a instance is currently the standby instance. Set up TSAMP tofacilitate automatic switching of users, applications, and data from onedatabase system to another in a cluster.

  1. In the Cloud Console, use ssh to connect to the db2-ainstance.

  2. Run the TSAMP configuration process.

  3. When asked, Create a domain and continue? , enter 1 for yes.

  4. When prompted to Create a unique name for the new domain, enter db2-ha.

  5. When asked, How many cluster nodes will the domain 'db2-ha' contain? ,enter 2.

  6. When prompted to Enter the host name of a machine to add to the domain:,enter db2-a.

  7. When prompted again toEnter the host name of a machine to add to the domain:,enter db2-b.

  8. When asked, Create the domain now?, enter 1 for yes.

  9. When asked, Configure a quorum device for the domain called 'db2-ha',enter 1 for yes.

  10. When prompted toEnter the number corresponding to the quorum device type to be used,enter 1.

  11. When prompted to Specify the network address of the quorum device,enter 169.254.169.254. This is the address of the Google Cloudmetadata server.

    Note: You can also deploy a Compute Engine instance in adifferent zone and use it as a network load balancer, or use any otheraddress that satisfies thenetwork quorum requirements.
  12. When asked, Create networks for these network interface cards?,enter 1.

  13. When prompted toEnter the name of the network for the network interface card: 'eth0' on cluster node,enter 1 for public network.

  14. When asked, Are you sure you want to add the network interface card 'eth0',enter 1.

  15. When prompted toEnter the name of the network for the network interface card: 'eth0, enter3 for private network.

  16. When asked, Are you sure you want to add the network interface card 'eth0',enter 1.

  17. When prompted with,The following are valid settings for the high availability configuration parameter:,enter 1 for TSA.

  18. When asked,Do you want to validate and automate HADR failover for the HADR database 'TESTDB'?,enter 1.

Setting up TSAMP on the db2-b instance

The db2-b instance is currently the primary instance. Set up TSAMP on thisinstance as well.

  1. In the Cloud Console, use ssh to connect to the db2-binstance.

  2. Run the TSAMP configuration process.

  3. When prompted ifThe following are valid settings for the high availability configuration parameter,enter 1 for TSA.

  4. When asked,Do you want to validate and automate HADR failover for the HADR database 'TESTDB'? [1],enter 1.

  5. When asked, Do you want to configure a virtual IP address for the HADR database 'TESTDB'?,enter 2 for no.

  6. When asked,Do you want to configure mount point monitoring for the HADR database 'TESTDB'?,enter 2.

  7. Verify your TSAMP status.

    The output is:

Testing your deployment

There are two key parts to testing the deployment, ACR and automatic failover.You start by setting up the db2-client instance. You verify that clientrerouting works when a standby instance is promoted to primary, and then youmake sure that the standby instance is promoted to primary when the primarystops functioning.

Prepare the client instance

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  1. In the Cloud Console, use ssh to connect to the db2-clientinstance.

  2. Add the required user groups.

  3. Add the users.

  4. Install the required packages.

  5. Create the installation directory.

  6. Copy the runtime client.

    Where:

    [GCS_BUCKET_NAME] represents the bucket you created at the beginning ofthis tutorial.

  7. Unzip the file.

  8. Create the installation response file.

  9. Install the db2-client runtime.

  10. Catalog the current primary instance, db2-b.

  11. Catalog the database.

  12. Terminate the running process to refresh the client cache.

Verify ACR from the client instance

To verify that automatic client rerouting works, you switch theprimary from the db2-b instance back to the db2-a instance and make surethat the client reconnects to the new primary instance.

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  1. Start the Db2 command-line processor.

  2. Connect to the database.

  3. Verify that the other Db2 instance, db2-a, is registered as thealternative instance. The db2-a instance is currently the standby instance.

    The output is:

  4. In the Cloud Console, use ssh to connect to the db2-ainstance.

  5. Initiate takeover.

  6. Return to the db2-client instance and run the following query:

    This query outputs a connection error:

    This is because the client couldn't connect to the db2-b instance . Duringthat process the client understands it has to communicate with the newprimary instance, db2-a.

  7. Run the preceding query again.

    The output displays 10 lines similar to:

  8. Check the connection status.

    The output is:

Verify TSAMP automated failover

To verify that TSAMP automated failover works, you stop the primary instance,db2-a, and make sure that the standby instance, db2-b, is promoted to be theprimary instance. Then you restart the db2-a instance and make sure it is nowthe standby instance.

  1. In Cloud Shell, stop the primary instance, db2-a.

  2. In the Cloud Console, use ssh to connect to the db2-binstance. The takeover process might take a few minutes.

  3. Check the quorum logs.

    If the output is:

    This means that the standby instance noticed the primary is down andtherefore, lost quorum.

    Now, if the output is:

    This means that the db2-b instance took the quorum.

  4. Check the cluster logs for the takeover operation.

    The output is:

  5. Verify that the role of the db2-b instance changed to Primary.

    The output is:

  6. In Cloud Shell, start the db2-a instance.

  7. In the Cloud Console, use ssh to connect to the db2-ainstance.

  8. Verify that the role of the db2-a instance changed to Standby.

    The output is:

Clean up

To avoid incurring charges to your Google Cloud account for the resources used in this tutorial, either delete the project that contains the resources, or keep the project and delete the individual resources.

Delete the project

    Caution: Deleting a project has the following effects:
    • Everything in the project is deleted. If you used an existing project for this tutorial, when you delete it, you also delete any other work you've done in the project.
    • Custom project IDs are lost. When you created this project, you might have created a custom project ID that you want to use in the future. To preserve the URLs that use the project ID, such as an appspot.com URL, delete selected resources inside the project instead of deleting the whole project.
  1. In the Cloud Console, go to the Manage resources page.
  2. In the project list, select the project that you want to delete, and then click Delete.
  3. In the dialog, type the project ID, and then click Shut down to delete the project.

What's next

  • Read moreabout IBM Db2.
  • Read aboutIBM Db2 replication modes.
  • Read more aboutTivoli System Automation.
  • Read more aboutAutomatic client reroute.
  • Read aboutother database and storage products on Google Cloud.
  • Explore reference architectures, diagrams, tutorials, and best practices about Google Cloud.Take a look at ourCloud Architecture Center.