Quickstart

Get started with a simple pipeline example

In this tutorial you will learn how to install RDI and set up a pipeline to ingest live data from a PostgreSQL database into a Redis database.

Prerequisites

  • A Redis Enterprise database that will serve as the pipeline target. The dataset that will be ingested is quite small in size, so a single shard database should be enough. RDI also needs to maintain its own database on the cluster to store state information. This requires Redis Enterprise v6.4 or greater.
  • Redis Insight to edit your pipeline
  • A virtual machine (VM) with one of the following operating systems:
    • Ubuntu 20.04 or 22.04
    • RHEL 8 or 9

Overview

The following diagram shows the structure of the pipeline we will create (see the architecture overview to learn how the pipeline works):

Here, the RDI collector tracks changes in PostgreSQL and writes them to streams in the RDI database in Redis. The stream processor then reads data records from the RDI database streams, processes them, and writes them to the target.

Install PostgreSQL

We provide a Docker image for an example PostgreSQL database that we will use for the tutorial. Follow the instructions on our Github page to download the image and start serving the database. The database, which is called chinook, has the schema and data for an imaginary online music store and is already set up for the RDI collector to use.

Install RDI

Install RDI using the instructions in the VM installation guide.

RDI will create the pipeline template for your chosen source database type at /opt/rdi/config. You will need this pathname later when you prepare the pipeline for deployment (see Prepare the pipeline below).

At the end of the installation, RDI CLI will prompt you to set the access secrets for both the source PostgreSQL database and the Redis RDI database. RDI needs these to run the pipeline.

Use the Redis console to create the RDI database with the following requirements:

  • A single-shard database with 125MB RAM is enough for the quickstart but double this to 250MB if you want to add a replica.
  • Provide the installation with the required RDI database details.
  • Set the database's eviction policy to noeviction and set data persistence to AOF - fsync every 1 sec.
  • Ensure that the RDI database is not clustered. RDI will not work correctly if the RDI database is clustered, but it is OK for the target database to be clustered.

Prepare the pipeline

During the installation, RDI placed the pipeline templates at /opt/rdi/config. If you go to that folder and run the ll command, you will see the pipeline configuration file, config.yaml, and the jobs folder (see the page about Pipelines for more information). Use Redis Insight to open the config.yaml file and then edit the following settings:

  • Set the host to localhost and the port to 5432.
  • Under tables, specify the Track table from the source database.
  • Add the details of your target database to the target section.

At this point, the pipeline is ready to deploy.

Create a context (optional)

To manage and inspect RDI, you can use the redis-di CLI command, which has several subcommands for different purposes. Most of these commands require you to pass at least two options, --rdi-host and --rdi-port, to specify the host and port of your RDI installation. You can avoid typing these options repeatedly by saving the information in a context.

When you activate a context, the saved values of --rdi-host, --rdi-port, and a few other options are passed automatically whenever you use redis-di. If you have more than one RDI installation, you can create a context for each of them and select the one you want to be active using its unique name.

To create a context, use the redis-di add-context command:

redis-di add-context --rdi-host <host> --rdi-port <port> --cluster-host <Redis DB host> --cluster-api-port <Redis DB API port> --cluster-user <Redis DB username> <unique-context-name>

These options are required but there are also a few others you can save, such as TLS credentials, if you are using them (see the reference page for details). When you have created a context, use redis-di set-context to activate it:

redis-di set-context <context name>

There are also subcommands to list and delete contexts.

Deploy the pipeline

You can use Redis Insight to deploy the pipeline by adding a connection to the RDI API endpoint (which has the same IP address as your RDI VM and uses port 8083) and then clicking the Deploy button. You can also deploy it with the following command:

redis-di deploy --dir <path to pipeline folder>

where the path is the one you supplied earlier during the installation. (You may also need to supply --rdi-host and --rdi-port options if you are not using a context as described above.) RDI first validates your pipeline and then deploys it if the configuration is correct.

Once the pipeline is running, you can use Redis Insight to view the data flow using the pipeline metrics. You can also connect to your target database to see the keys that RDI has written there.

See Deploy a pipeline for more information about deployment settings.

View RDI's response to data changes

Once the pipeline has loaded a snapshot of all the existing data from the source, it enters change data capture (CDC) mode (see the architecture overview and the ingest pipeline lifecycle for more information ).

To see the RDI pipeline working in CDC mode:

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