1. Disabling Spring Cloud Circuit Breaker Hystrix

You can disable the auto-configuration by setting spring.cloud.circuitbreaker.hystrix.enabled to false.

2. Configuring Hystrix Circuit Breakers

2.1. Default Configuration

To provide a default configuration for all of your circuit breakers create a Customize bean that is passed a HystrixCircuitBreakerFactory or ReactiveHystrixCircuitBreakerFactory. The configureDefault method can be used to provide a default configuration.

@Bean
public Customizer<HystrixCircuitBreakerFactory> defaultConfig() {
    return factory -> factory.configureDefault(id -> HystrixCommand.Setter
            .withGroupKey(HystrixCommandGroupKey.Factory.asKey(id))
            .andCommandPropertiesDefaults(HystrixCommandProperties.Setter()
            .withExecutionTimeoutInMilliseconds(4000)));
}
Reactive Example
@Bean
public Customizer<ReactiveHystrixCircuitBreakerFactory> defaultConfig() {
    return factory -> factory.configureDefault(id -> HystrixObservableCommand.Setter
            .withGroupKey(HystrixCommandGroupKey.Factory.asKey(id))
            .andCommandPropertiesDefaults(HystrixCommandProperties.Setter()
                    .withExecutionTimeoutInMilliseconds(4000)));
}

2.2. Specific Circuit Breaker Configuration

Similarly to providing a default configuration, you can create a Customize bean this is passed a HystrixCircuitBreakerFactory

@Bean
public Customizer<HystrixCircuitBreakerFactory> customizer() {
    return factory -> factory.configure(builder -> builder.commandProperties(
                    HystrixCommandProperties.Setter().withExecutionTimeoutInMilliseconds(2000)), "foo", "bar");
}
Reactive Example
@Bean
public Customizer<ReactiveHystrixCircuitBreakerFactory> customizer() {
    return factory -> factory.configure(builder -> builder.commandProperties(
                    HystrixCommandProperties.Setter().withExecutionTimeoutInMilliseconds(2000)), "foo", "bar");
}