Spring Boot Admin - Persist applications and events

Question

I have a problem with Spring Boot Admin: after restarting the server instance, it loses all applications and events.

This is the schema and steps: server instance that monitor application A, B and C.

1. Start server instance
2. Start app A, B and C
3. Stop app C and server instance
4. Restart server instance
5. At this point the event journal is cleared and the application C in not in the application list

How can I manage this situation? Maybe, I have to persist these information on db. But, I can't find anything useful.

Thanks

Answer 1

You can use Hazelcast for make apps and events persistent. Take a look at SBA documentation (clustering paragraph).

Add Hazelcast dependency in pom.xml:

<dependency>
    <groupId>com.hazelcast</groupId>
    <artifactId>hazelcast</artifactId>
</dependency>

Then, in application.properties:

spring.boot.admin.hazelcast.enabled=true
spring.boot.admin.hazelcast.event-store=spring-boot-admin-event-store

Instantiate a HazelcastConfig

    @Bean
public Config config() {
    MapConfig eventStoreMap = new MapConfig("spring-boot-admin-event-store")
            .setInMemoryFormat(InMemoryFormat.OBJECT)
            .setBackupCount(1)
            .setEvictionPolicy(EvictionPolicy.NONE)
            .setMergePolicyConfig(new MergePolicyConfig(PutIfAbsentMapMergePolicy.class.getName(), 100))
            .setMapStoreConfig(new MapStoreConfig().setImplementation(new HazelcastEventImplementation()));

    Config config = new Config();
    config.addMapConfig(eventStoreMap);
    config.setProperty("hazelcast.jmx", "true");

    return config;
}

Finally, implement a MapStore< InstanceId, ArrayList > class with your preferred persistence method (in my example configuration HazelcastEventImplementation.java).