Runtime Environments
Basics
Cloud Functions | App Engine | Cloud Run | Kubernetes Engine | Compute Engine | |
Fully Managed | FaaS | PaaS | CaaS/PaaS | Kubernetes Clusters | Virtual Machines |
Deployable Artifact | Source or JAR | Source or JAR | Container Image | Container Image | Anything, and Container Image |
Locality | Regional | Regional | Regional | Zonal/Regional | Zonal/Regional |
Billing Units | Instance execution time seconds and Invocations | Instance up time minutes | Instance execution time seconds | Control plane and VM instance hours | VM instance hours |
vCPU | 1 | 1, up to 4.8GHz | Up to 2 | Up to 416 per node, and up to 5000 nodes. | 0.5 to 416 |
Memory | Up to 2GB | Up to 2GB | Up to 4GB | Up to 11TB per node. | Up to 11TB |
Disk | Writable | Writable | Writable | Attach Tmpfs/PD/SSD | Attach PD/SSD |
Use For | Webhooks Event Handlers Tasks | Web Apps Microservices Event Handlers Tasks | Web Apps Microservices Event Handlers Tasks | Any container workload JEE applications Microservices | Any workload JEE applications Databases |
Application Lifecycle
Cloud Functions | App Engine | Cloud Run | Kubernetes Engine | Compute Engine | |
Liveness Check | Port is listening | /_ah/health | Port is listening | Liveness Probe | Manual |
Readiness/Warmup Check | No | /_ah/warmup | No | Readiness Probe | Manual |
Graceful Shutdown | No Signal | /_ah/stop | No Signal |
| Manual |
Scaling
Cloud Functions | App Engine | Cloud Run | Kubernetes Engine | Compute Engine | |
Scaling | 0 to N in seconds | 0 to N in seconds | 0 to N in seconds | 1 to N in seconds or minutes | 1 to N in minutes |
Autoscaling | Yes | Yes | Yes | Yes, with HPA and Cluster Autoscaler | Yes, with Managed Instance Group |
Scaling Min/Max | No | Yes | Yes (alpha) | Yes, with HPA and Cluster Autoscaler | Yes, with Managed Instance Group |
Manual Scaling | No | Yes | No | Yes | Yes |
Load Balancing
Cloud Functions | App Engine | Cloud Run | Kubernetes Engine | Compute Engine | |
Network Load Balancer | No | No | No | Yes, with | Yes, with Network Load Balancer |
HTTP | Yes | Yes | Yes | Yes, with | Yes, with HTTP(s) Load Balancer |
HTTPs | Yes | Yes | Yes | Yes, with | Yes, with HTTP(s) Load Balancer |
Custom Domain | No | Yes | Yes | Yes, manual configuration | Yes, manual configuration |
Managed SSL Certificate | Yes | Yes | Yes | Yes, with | Yes, with HTTP(s) Load Balancer |
Networking
Cloud Functions | App Engine | Cloud Run | Kubernetes Engine | Compute Engine | |
Use VPC | Yes | Yes | Yes | Yes | Yes |
Expose on VPC Only | Yes | No | No | Yes | Yes |
Internal VPC Only Load Balancing | No | No | No | Yes | Yes |
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