分别运行 Lagom Service Locator / Kafka / Cassandra

Question

In order to have a complete control on the components of my architecture, I'd like to deploy all the infrastructure components (Service Locator, Cassandra, Kafka) and services individually.

I'm able to run a service with a command as follows: mvn lagom:startServiceLocator lagom:startCassandra -pl hello-impl lagom:run

However, when I start these components individually (ie by mvn lagom:startServiceLocator ), the started component terminates automatically. In this case, I see the following logs but the locator is not available at http://localhost:9008 .

I'm on a local development environment with no proxy and using the default configurations.

How can I run those individually?

Answer 1

Java/Maven : If you want to run several Lagom microservices, you just need to do what you was doing:

mvn lagom:startServiceLocator lagom:startCassandra -pl hello-impl lagom:run

It will start locator, cassandra, if you need you can add kafka, after that, you just run in new cmd following command:

mvn -pl second-lagom-microservice-impl lagom:run

Now it will connect to running in first command cassandra and locator.

Lagom does not allow you to run cassandra or locator without running service.

Scala/Sbt :

For sbt the same approach, we need to run first microservice with all needed services:

sbt lagomServiceLocatorStart lagomCassandraStart lagomKafkaStart microservice-impl/run

Then just run another like: **sbt another-microservice-impl/run**

Also, you can add an alias in build.sbt for your microservice to run it individually:

addCommandAlias(s"runMicrocervice1", ";lagomServiceLocatorStart;lagomCassandraStart;lagomKafkaStart;microservice1-impl/run")

And just run it as:

sbt runMicrocervice1