如何在相同服务的spring boot应用实例之间启用缓存？

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-cache</artifactId>
</dependency>
<dependency>
    <groupId>net.sf.ehcache</groupId>
    <artifactId>ehcache</artifactId>
</dependency>

@Service
public class MyService {

    @Cacheable(value = "myCache", key = "#param")
    public Object getData(String param) {
        // 从数据库或其他数据源获取数据
        return data;
    }

    @CachePut(value = "myCache", key = "#param")
    public void updateData(String param, Object newData) {
        // 更新数据库或其他数据源的数据
    }

    @CacheEvict(value = "myCache", key = "#param")
    public void deleteData(String param) {
        // 删除数据库或其他数据源的数据
    }
}

spring.cache.type=ehcache

<ehcache>
    <cache name="myCache"
           maxEntriesLocalHeap="1000"
           timeToLiveSeconds="3600">
    </cache>
</ehcache>