PCF - Cloud Foundry Concepts exam 2024 with 100% correct answers

How does Cloud balance its loads? - correct answer Clouds balance their processing loads over multiple machines, optimizing for efficiency and resilience against point failure. A CF installation accomplishes this at 3 levels: 1. BOSH: creates and deploys VMs on top of a physical computing infrastructure, and deploys and runs CF on top of this cloud. To configure the deployment, BOSH follows a manifest doc. 2. The CF Cloud Controller: runs the apps and other processes on the cloud's VMs, balancing demand and managing app lifecycles. 3. Router: routes incoming traffic from the world to the VMs that are running the apps that the traffic demands, usually working with a customer-provided load balancer. Cloud Foundry's two types of VMs? - correct answer 1. Component VM: constitute the platform's infrastructure 2. Host VMs: host apps for the outside world. Diego system distributes the hosted app load over all of the host VMs, and keeps it running and balanced through demand surges, outages, or other changes. Diego accomplishes this through an auction algorithm. To meet demand, multiple host VMs run duplicate instances of the same app. This means that apps must be portable. Where do CF store resources? - correct answer Cloud Foundry uses the git system on GitHub to version-control source code, buildpacks, documentation, and other resources. To store large binary files (droplets, etc), CF maintains an internal or external blobstore. To store and share temporary information such as internal component states, CF uses the distrubted value-store systems Consul and etcd.