Depending on what you're doing, the Cloudera Management Services are likely not needed for your project. They deal with monitoring the various services. They make it harder to tell from the Cloudera Manager home page if the service is healthy, but if they crash after 5 minutes it shouldn't affect any of the services themselves. In my experience with the VM, often 1 service will fail that impacts the others (often it's the Host Monitor). I'd look at the monitoring data for the services to see which one is going down first, and then dig deeper in it's logs to see what the problem is. 8 GB should not be seen as plenty, but as the absolute bare minimum required. If you're running all of the Cloudera Manager services and putting load on Flume, Kafka and Spark / YARN, I'd expect your VM to be straining to keep up. These are all services designed to run on fairly large clusters, not minimal VMs - it will struggle with certain projects. I'd recommend adding more memory if you're able to - that is likely the reason on of the Cloudera Management Services isn't keeping up.
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