Customizing JVM options

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You can customize the JVM options in an Operational Decision Manager production deployment at installation time, or use the default settings. You use the jvmOptionsRef parameters in the custom resources .yaml file.

About this task

When you install Operational Decision Manager, the following configmap files are generated. They define the default Liberty server JVM options for each Operational Decision Manager component.

Table 1. Naming convention for configmap files
Component	Name of configmap
Decision Center	`<instance_name>`-odm-dc-jvm-options-configmap
Decision Runner	`<instance_name>`-odm-dr-jvm-options-configmap
Decision Server console	`<instance_name>`-odm-ds-console-jvm-options-configmap
Decision Server runtime	`<instance_name>`-odm-ds-runtime-jvm-options-configmap

Where <instance_name> is the name of the custom resource file.

By default, the only JVM option in the Decision Center configmap file is the time zone.

-Duser.timezone=Europe/Paris

Note: You perform the following steps when you configure the custom resource (CR).

Procedure

Create a jvm.options file with the new settings for the Liberty JVM.
The name must be jvm.options as it replaces the default file in the container.
Tip: If you need to add multiple options in Decision Center or in the other components, separate the options by using the \n separator.
```
-Dprop1=val1\n-Dprop2=val2
```
Create a configmap with a key that corresponds to the component that you want to modify.
The following keys must be used:
- Decision Center: dc-jvm-options
- Decision Runner: dr-jvm-options
- Decision Server console: dsc-jvm-options
- Decision Server runtime: dsr-jvm-options
For example, to create a JVM options configmap for Decision Center, enter the following command:
```
kubectl create configmap my-odm-dc-jvm-options-configmap --from-file=dc-jvm-options=jvm.options
```
Associate the new configmap to the application definition by using the appropriate jvmOptionsRef parameter in the custom resource .yaml file that the operator used to deploy Operational Decision Manager.
For example, to change the logging in Decision Center, specify the following in the .yaml file:
```
decisionCenter:
   jvmOptionsRef: my-odm-dc-jvm-options-configmap
```
To update the existing containers, run the kubectl apply command on the custom resource .yaml file.
```
kubectl apply -f custom_resources.yaml
```

Results

The operator modifies the application to use the new configmap and updates the /config/configDropins/overrides/jvm.options file.