Other Overrides

The component sub-charts allow you to override default settings for several Kubernetes features.

When you use Helm chart properties to pass in a Kubernetes-defined object structure, such as resources or affinity rules, the structure you give replaces the default structure. No merge takes place. It might not always be appropriate to set or change these values, depending upon component type.

Override Properties describes the properties that override certain defaults.

Table 1. Override Properties
Property	Description	Type
`sub-chart-name`.nodeSelector	This allows a NodeSelector to be defined for the component pod(s).	NodeSelector
`sub-chart-name`.tolerations	This allows Tolerations to be assigned to the component pod(s).	Toleration
`sub-chart-name`.affinity	This allows Affinity rules to be assigned to the component pod(s).	Affinity
`sub-chart-name`.podSecurityContext	This allows a SecurityContext to be specified for the component pod(s).	PodSecurityContext
`sub-chart-name`.resources	This allows resources to be defined for the main container in the components pod(s). For MATRIXX gateways and web apps, `resources.limits.memory` is also translated into JVM maximum heap values. For engine pods and Traffic Routing Agent (TRA-DR and TRA-RT), `resources.limits.memory` is also used to configure the `/dev/shm` memory size.	Resources
`sub-chart-name`.securityContext	This allows a SecurityContext to be specified for the main container in the components pod(s).	SecurityContext
`sub-chart-name`.additionalContainers	This allows a list of additional sidecar containers to be added alongside the main container in a pod.	Container

Note: The Affinity, Tolerance, Resources, NodeSelector, PodSecurityContext, and SecurityContext configuration settings in Override Properties can be applied on an engine by engine basis and also per engine pod type: processing, publishing or checkpointing. For more information, see the discussion about domain, sub-domain, and engine topology configuration in MATRIXX Configuration.

Default Affinity Rules describes the default affinity rules used by various components. These are used if no other values are supplied.

Table 2. Default Affinity Rules
Component	Affinity Rule	Anti-Affinity	Command
ActiveMQ Gateway		Preference for scheduling the pod away from other ActiveMQ Gateway pods in the same group. Preference for not scheduling the pod on nodes where the `mtx-type` label is `proc`, `publ` or `ckpt`.	Use the following command to see the default affinity used in the deployment: `helm template matrixx/activemq --show-only templates/deployment.yaml`
Event Streaming Framework	Preference for scheduling the pod on the same nodes as an RS Gateway pod.	Preference for scheduling the pod away from other Event Streaming Framework pods in this deployment. Preference for not scheduling the pod on nodes where the `mtx-type` label is `proc`, `publ` or `ckpt`.	Use the following command to see the default affinity used in the deployment: `helm template matrixx/event-streamer --show-only templates/deployment.yaml`
Gateway Proxy		Preference for scheduling the pod away from other Gateway Proxy pods in this deployment. Preference for not scheduling the pod on nodes where the `mtx-type` label is `proc`, `publ` or `ckpt`.	Use the following command to see the default affinity used in the deployment: `helm template matrixx/gateway-proxy --show-only templates/deployment.yaml`
LDAP Gateway	Preference for scheduling the pod on the same nodes as a Gateway Proxy pod.	Preference for scheduling the pod away from other LDAP Gateway pods in this deployment. Preference for not scheduling the pod on nodes where the `mtx-type` label is `proc`, `publ` or `ckpt`.	Use the following command to see the default affinity used in the deployment: `helm template matrixx/ldap-gateway --show-only templates/deployment.yaml`
MATRIXX Backoffice Customer Tool	Preference for scheduling the pod on the same nodes as an RS Gateway pod.	Preference for scheduling the pod away from other MATRIXX Backoffice Customer Tool pods in this deployment. Preference for not scheduling the pod on nodes where the `mtx-type` label is `proc`, `publ`, or `ckpt`.	Use the following command to see the default affinity used in the deployment: `helm template matrixx/matrixxbct --show-only templates/deployment.yaml`
My MATRIXX		Preference for scheduling the pod away from other My MATRIXX pods in this deployment. Preference for not scheduling the pod on nodes where the `mtx-type` label is `proc`, `publ`, or `ckpt`.	Use the following command to see the default affinity used in the deployment: `helm template matrixx/mymatrixx --show-only templates/deployment.yaml`
Notification Framework	Preference for scheduling the pod on the same nodes as an RS Gateway pod.	Preference for scheduling the pod away from other Notification Framework pods in this deployment. Preference for not scheduling the pod on nodes where the `mtx-type` label is `proc`, `publ` or `ckpt`.	Use the following command to see the default affinity used in the deployment: `helm template matrixx/notifier --show-only templates/deployment.yaml`
Payment Service	Preference for scheduling the pod on the same nodes as a Gateway Proxy pod.	Preference for scheduling the pod away from other Payment Service pods in this deployment. Preference for not scheduling the pod on nodes where the `mtx-type` label is `proc`, `publ` or `ckpt`.	Use the following command to see the default affinity used in the deployment: `helm template matrixx/activemq --show-only templates/deployment.yaml`
RS Gateway	Preference for scheduling the pod on the same nodes as an Gateway Proxy pod.	Preference for scheduling the pod away from other RS Gateway pods in this deployment. Preference for not scheduling the pod on nodes where the `mtx-type` label is `proc`, `publ`, or `ckpt`.	Use the following command to see the default affinity used in the deployment: `helm template matrixx/rsgateway --show-only templates/deployment.yaml`
SBA Gateway		Preference for scheduling the pod away from other SBA Gateway pods in this deployment. Preference for not scheduling the pod on nodes where the `mtx-type` label is `proc`, `publ` or `ckpt`.	Use the following command to see the default affinity used in the deployment: `helm template matrixx/sba-5gc-chf --show-only templates/deployment.yaml`
Traffic Routing Agent		Requirement to schedule away from other TRA pods in this deployment.	Use the following command to see the default affinity used in the deployment: `helm template matrixx/tra --show-only templates/tra.yaml`