In Google Cloud, a TCP Internal Load Balancer is used to facilitate failover of the SAP HANA virtual IP. The frontend of the load balancer is assigned an ephemeral IP from the subnet that it operates in. In this example, we will be using the following IP address for load balancer corresponding to the sps-hana virtual hostname:

  • SAP HANA virtual host:
    • Virtual hostname: sps-hana
    • Internal TCP load balancer: ilb-sps-hana
    • IP address: 10.20.0.10

Following the steps provided in GCP – Using an Internal Load Balancer and Responding to Load Balancer Health Checks, create and configure the following Google Cloud and LifeKeeper resources.

  1. Create two unmanaged instance groups: ig-sps-hana-zone1, containing node-a, and ig-sps-hana-zone2, containing node-b.

  1. Create a TCP Internal Load Balancer, ilb-sps-hana, with the following properties. The icon indicates that the default option is chosen.
Name
ilb-sps-hana
Backend configuration
Region <Deployment region> (e.g., us-east1)
Network lk-vpc
Backends ig-sps-hana-zone1
ig-sps-hana-zone2
Health Check
Name hc-sps-hana
Protocol TCP
Port 50098 (This must agree with the corresponding LifeKeeper GenLB resource created later)
Proxy protocol NONE
Request Leave empty
Response Leave empty
Check interval 2 seconds
Timeout 2 seconds
Healthy threshold 2 consecutive successes
Unhealthy threshold 3 consecutive failures
Connection draining timeout 10 seconds
Frontend configuration
Name fe-sps-hana
Subnetwork lk-subnet
Purpose Non-shared
IP address Ephemeral (Custom)
Custom ephemeral IP address 10.20.0.10
Ports All
Global access Disable
Service label Leave empty

Once created, the Network services → Load balancing page in the Google Cloud Console will show the load balancer.

  1. [Optional] Implement the startup script workaround described in the Enabling Load Balancer Traffic from Backend Servers section of GCP – Using an Internal Load Balancer to allow node-a and node-b to communicate through the frontend IP address of the load balancer. Reboot node-a and node-b for the changes to take effect. This step is optional for a SAP HANA deployment since inter-backend communication through the frontend IP of the load balancer is not required in this configuration, but it may make it easier to test the functionality of the ilb-sps-hana GenLB resource in the next step from within the cluster nodes themselves.
  1. Following the steps in Responding to Load Balancer Health Checks, install the LifeKeeper Generic Application Recovery Kit for Load Balancer Health Checks (“GenLB Recovery Kit”) and create a LifeKeeper GenLB resource, ilb-sps-hana, with the following properties. The icon indicates that the default option is chosen.
Field
Value
Create Resource Wizard
Switchback Type intelligent
Server node-a
Restore Script /opt/LifeKeeper/SIOS_Hotfixes/Gen-LB-PL-7172/restore.pl
Remove Script /opt/LifeKeeper/SIOS_Hotfixes/Gen-LB-PL-7172/remove.pl
QuickCheck Script /opt/LifeKeeper/SIOS_Hotfixes/Gen-LB-PL-7172/quickCheck
Local Recovery Script None (Empty)
Application Info 50098
Bring Resource In Service Yes
Resource Tag ilb-sps-hana
Pre-Extend Wizard
Target Server node-b
Switchback Type intelligent
Template Priority 1
Target Priority 10
Extend gen/app Resource Hierarchy Wizard
Resource Tag ilb-sps-hana
Application Info 50098

The resource will appear in the LifeKeeper GUI resource pane once it has been created and extended successfully.

  1. Add the following entry to /etc/hosts on node-a and node-b to allow resolution of the virtual hostname to the frontend IP address of the corresponding load balancer:

10.20.0.10 sps-hana

  1. Test switchover and failover of the GenLB resources as described in the Test GenLB Resource Switchover and Failover section of Responding to Load Balancer Health Checks. Correct any issues found or tune the parameters of the load balancer health checks as required to achieve successful operation.

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