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Pub/Sub is an asynchronous and scalable messaging service that decouples services producing messages from services processing those messages. For more information, see What is Pub/Sub?
This document describes the connections and parameters you can configure when using App Design Center to create a Pub/Sub topic and subscription. The configuration parameters are based on the terraform-google-pubsub Terraform module.
Component connections The following table includes the components that you can connect to a Pub/Sub topic or subscription, and the resulting updates to your application and its generated Terraform code.
Connected component
Application updates
Background information
Compute Engine instance template
The Compute Engine instances can publish to and receive messages from the Pub/Sub topic. The Pub/Sub topic ID is added to the Compute Engine instance template metadata. Instance templates Service account
The service account can manage Pub/Sub topics, and pull messages from subscriptions. The roles/pubsub.editor role is added to the service account. The service account name and email information is added to the Pub/Sub pull subscription. Access control with IAM BigQuery
The Pub/Sub subscription can write messages to the BigQuery dataset. The BigQuery dataset information is added to the BigQuery subscription fields. BigQuery subscriptions Cloud Run
The Cloud Run service can receive messages or publish to the Pub/Sub topic. The Pub/Sub topic ID is added to the Cloud Run environment variables. The roles/pubsub.publisher and roles/pubsub.subscriber roles are added to the Cloud Run service account. The Cloud Run service is added to the Pub/Sub push and pull subscription fields. Use Pub/Sub with Cloud Run tutorial Cloud Storage
The Pub/Sub subscription can write messages to the Cloud Storage bucket. The Cloud Storage bucket information is added to the Pub/Sub subscription fields. Cloud Storage subscriptions
Required configuration parameters If your template includes a Pub/Sub component, you must configure the following parameters before you deploy.
Optional configuration parameters The following parameters are optional. To display advanced parameters, in the Configuration area, select Show advanced fields .
Feature
Parameter name
Description and constraint information
Background information
Create Topic By default, a topic is created. Clear the checkbox if you don't want to create a topic. Create a topic Create Subscriptions By default, a subscription is created. Clear the checkbox if you don't want to create a subscription. Subscription overview Topic Labels
Key labels Reporting usage with labels Value labels Reporting usage with labels Push Subscriptions
Name name Guidelines to name a topic, subscription, schema, or snapshot Ack Deadline Seconds ackDeadlineSeconds Acknowledgment deadline Push Endpoint pushEndpoint Endpoints X-goog-version The Pub/Sub API format of the pushed message. For example, v1beta1. attributes OIDC Service Account email serviceAccountEmail Authentication Audience audience Authentication Expiration Policy expirationPolicy Expiration period Dead Letter Topic deadLetterTopic Dead letter topic Retain Acked Messages retainAckedMessages Retain acknowledged messages Message Retention Duration messageRetentionDuration Message retention duration Max Delivery Attempts maxDeliveryAttempts Dead letter topic Maximum Backoff maximumBackoff Retry policy Minimum Backoff minimumBackoff Retry policy Filter filter Subscription filter Enable Message Ordering enableMessageOrdering Message ordering Pull Subscriptions
Name name Guidelines to name a topic, subscription, schema, or snapshot Ack Deadline Seconds ackDeadlineSeconds Acknowledgment deadline Dead Letter Topic deadLetterTopic Dead letter topic Max Delivery Attempts maxDeliveryAttempts Dead letter topic Retain Acked Messages retainAckedMessages Retain acknowledged messages Message Retention Duration messageRetentionDuration Message retention duration Maximum Backoff maximumBackoff Retry policy Minimum Backoff minimumBackoff Retry policy Filter filter Subscription filter Enable Message Ordering enableMessageOrdering Message ordering Service Account Enable Exactly Once Delivery enableExactlyOnceDelivery Exactly-once delivery BigQuery Subscriptions
Name name Guidelines to name a topic, subscription, schema, or snapshot Table table Create BigQuery subscriptions Use Topic Schema useTopicSchema Use topic subscription Use Table Schema useTableSchema Use table schema Write Metadata writeMetadata Write metadata Drop Unknown Fields dropUnknownFields Drop unknown fields Ack Deadline Seconds ackDeadlineSeconds Acknowledgment deadline Retain Acked Messages retainAckedMessages Retain acknowledged messages Message Retention Duration messageRetentionDuration Message retention duration Enable Message Ordering enableMessageOrdering Message ordering Expiration Policy expirationPolicy Expiration period Filter filter Subscription filter Dead Letter Topic deadLetterTopic Dead letter topic Maximum Backoff maximumBackoff Retry policy Minimum Backoff minimumBackoff Retry policy Cloud Storage Subscriptions
Name name Guidelines to name a topic, subscription, schema, or snapshot Bucket bucket Bucket name Filename Prefix filenamePrefix Filename prefix, suffix, and datetime Filename Suffix filenameSuffix Filename prefix, suffix, and datetime Filename Datetime Format filenameDatetimeFormat Filename prefix, suffix, and datetime Max Duration maxDuration File batching Max Bytes maxBytes File batching Max Messages maxMessages File batching Output Format textConfig or avroConfig File format Write Metadata writeMetadata Write metadata Use Topic Schema useTopicSchema Use topic schema Ack Deadline Seconds ackDeadlineSeconds Acknowledgment deadline Retain Acked Messages Retain acknowledged messages Message Retention Duration messageRetentionDuration Message retention duration Enable Message Ordering enableMessageOrdering Message ordering Expiration Policy expirationPolicy Expiration period Filter filter Subscription filter Dead Letter Topic deadLetterTopic Dead letter topic Maximum Backoff maximumBackoff Retry policy Minimum Backoff minimumBackoff Retry policy Subscription Labels
Key labels Reporting usage with labels Value labels Reporting usage with labels Topic Message Retention Duration topicMessageRetentionDuration Message retention duration Topic KMS Key Name kmsKeyName Use a customer-managed encryption key (CMEK) Grant BigQuery Project Roles By default, the BigQuery Metadata Viewer and BigQuery Data Editor roles are granted to default Pub/Sub service account. If you don't want to grant these roles, clear the checkbox. Assign BigQuery roles to the Pub/Sub service account Grant Token Creator By default, the Service Account Token Creator role is granted to default Pub/Sub service account. If you don't want to grant this role, clear the checkbox. Set up authentication for Pub/Sub Schema
Name name Important information about schemas Type type Types of schemas Definition definition Types of schemas Encoding encoding Guidelines to associate a schema with a topic
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Last updated 2025-11-24 UTC.
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