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Cloud Foundry is an open-source platform as a service (PaaS) for deploying and operating applications without making each development team assemble its own runtime, networking, scaling, and service integrations. You deliver source code with a command such as cf push; Cloud Foundry detects or uses the requested buildpack, creates a runnable application image (called a droplet), schedules processes, routes traffic, and exposes approved databases and other services through a marketplace. It can run on private infrastructure or on IaaS providers including VMware vSphere, AWS, Azure, Google Cloud Platform, and OpenStack. The result is a consistent developer workflow with infrastructure choices, rather than a single proprietary cloud.
What is Cloud Foundry, in practical terms?
Cloud Foundry is an application-focused PaaS. A PaaS sits between application code and raw infrastructure: developers choose a runtime, configuration, service, and scale, while the platform team operates the virtual machines, networking, security controls, deployment mechanics, and much of the observability.
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The platform is deliberately opinionated. Its conventions define how an application is packaged, started, exposed to the network, logged, and connected to backing services. That opinionated path is intended to give organizations efficiency, security, and speed while allowing developers to concentrate on application behavior instead of platform assembly.
Cloud Foundry is open source and separates the developer experience from the infrastructure underneath. The same application model can be implemented on an organization’s own data center, a public-cloud IaaS, a managed Cloud Foundry service, virtual machines, or, through the Korifi project, Kubernetes. The exact commands, buildpacks, service catalog, and integration options still depend on the distribution and release selected by the operator.
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What is Cloud Foundry used for?
Teams use Cloud Foundry to build, test, deploy, and scale web applications, APIs, workers, and other long-running processes. It is particularly useful when an organization wants a paved road from source control to a running application and wants platform engineers to enforce common policies once rather than having every team implement them independently.
- Application delivery: Developers submit source code and environment settings instead of hand-building virtual machines or container images for each release.
- Standard runtimes: Buildpacks provide supported language runtimes and libraries for technologies such as Java, Node.js, Go, Python, PHP, Ruby, and .NET.
- Internal platforms: Operators expose approved databases, queues, and SaaS integrations in a marketplace that developers can consume through a consistent interface.
- Multi-environment operation: Organizations can use the same application-oriented workflow across on-premises and public-cloud foundations.
- Policy-driven delivery: Security, networking, configuration, logging, and lifecycle rules can be centralized while application teams retain self-service access.
How does Cloud Foundry work?
A Cloud Foundry deployment is a collection of cooperating services. The following components explain what happens between a developer’s command and a request reaching an application instance.
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|---|---|---|
| BOSH | Deploys and manages Cloud Foundry and its updates on the underlying infrastructure. | Operators describe infrastructure and releases; BOSH handles VM creation, configuration, and lifecycle work. |
| Cloud Controller | Accepts application commands and manages application lifecycles. | The cf CLI communicates with the controller for login, push, scaling, environment variables, and status. |
| Buildpacks and stacks | Turn source code, language runtimes, libraries, and operating-system components into a runnable droplet. | A team can select a supported buildpack or supply one approved by the platform team rather than maintaining a bespoke base image. |
| Diego | Schedules and balances application processes across host VMs. | Instances can be distributed and restarted when a host or process fails, subject to the platform’s capacity and policies. |
| Gorouter | Routes incoming requests to healthy application instances. | A mapped route remains the public entry point while instances are added, removed, or moved between hosts. |
| Loggregator | Aggregates application logs and platform metrics. | Developers can stream recent logs and operators can feed platform events and metrics into monitoring systems. |
When an application needs a database or another managed dependency, the marketplace provides discoverable offerings. A service broker advertises those offerings, provisions an instance, and supplies credentials or connection details to the application through the Open Service Broker API. This keeps secret handling and provisioning flows consistent instead of turning every application deployment into a custom ticket.
How do you deploy an application to Cloud Foundry?
The precise login endpoint and available services vary by distribution, but the normal workflow is short because the platform owns packaging and placement. Obtain an account, an API endpoint, and access to an organization and space before starting.
- Install the Cloud Foundry CLI. Use the version supported by your provider and confirm that the
cfcommand is available in your shell. - Log in to the platform API. Run
cf login -a https://API-ENDPOINT, then provide your credentials or the identity-provider method required by your organization. Do not put a password in shell history. - Select an organization and space. Use
cf target -o ORGANIZATION -s SPACE. Spaces separate teams, environments, and permissions inside an organization. - Inspect the available runtimes. Run
cf buildpacksto see operator-approved buildpacks. If a project needs a specific runtime version, verify that it exists before pushing. - Push the source. From the project directory, run
cf push APP-NAME. Cloud Foundry detects the application type, stages dependencies with a buildpack, creates a droplet, and starts an application process. - Check the result. Use
cf app APP-NAMEfor state, instance count, memory, and routes. Stream recent output withcf logs APP-NAME --recent; follow live output withcf logs APP-NAME. - Set configuration separately from code. Use
cf set-env APP-NAME KEY VALUEfor non-secret settings, then restage withcf restage APP-NAMEwhen a change must be supplied during staging. Many organizations instead inject secrets through a managed configuration service. - Scale deliberately. Increase process instances with
cf scale APP-NAME -i 3or adjust memory and disk using the flags supported by your provider. Scaling creates more copies; it does not make a single-threaded process faster.
For repeatable releases, place the application name, memory, instance count, buildpack, routes, and environment settings in a manifest.yml checked into version control. Keep credentials out of that file unless your platform explicitly provides encrypted secret handling.
How do you attach a database or other service?
Start by inspecting the catalog with cf marketplace. The output is distribution-specific: one provider may offer PostgreSQL, another may expose a commercial database, queue, object store, or SaaS API.
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- Choose a service and plan shown by
cf marketplace. - Create an instance with
cf create-service SERVICE-NAME PLAN-NAME INSTANCE-NAME. - Bind it to the application with
cf bind-service APP-NAME INSTANCE-NAME. - Restage or restart the application if the broker requires it, then read the injected connection details through the platform’s service-binding mechanism.
Before relying on a service in production, confirm its backup policy, data location, availability target, upgrade process, and exit procedure with the broker or provider. “Available in the marketplace” does not by itself describe durability or compliance.
What are the main benefits of Cloud Foundry?
Developer productivity
A standard push-based workflow removes repeated work such as selecting an operating-system image, wiring a reverse proxy, or writing a deployment controller. Developers still own code, dependencies, tests, and application settings, while the platform supplies a known path to a running process.
Portability without pretending every move is automatic
Cloud Foundry’s open interfaces and infrastructure choices reduce dependence on one cloud or framework. Applications can be decoupled from a particular VM estate and moved among on-premises, public-cloud, managed, VM, and Kubernetes environments with minimal application change when the target distribution offers compatible buildpacks, routes, services, and policies. Data migration, identity integration, network rules, and provider-specific services can still require substantial work.
Operational consistency
Platform teams can standardize buildpack versions, patching, network exposure, logging, quotas, and lifecycle controls. A new application inherits those controls instead of waiting for an individual team to reproduce them. This also gives operators a common place to audit deployments and capacity.
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The marketplace and Service Broker API create a contract between application teams and infrastructure providers. Developers discover approved offerings and request instances through familiar commands; brokers perform provisioning and return binding data in a machine-readable way.
Security and compliance enablement
Centralized controls can make the secure path the easiest path: only approved buildpacks may be available, routes can be governed, and service credentials can be delivered through bindings rather than copied into source code. Cloud Foundry does not automatically make an application compliant; identity, patching, secrets, data residency, and evidence collection still need explicit ownership.
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Scaling and resilience
Diego distributes processes across host VMs, and Gorouter sends traffic to application instances. Multiple instances can improve availability during a process or host failure, provided the application is designed to tolerate restarts and the underlying foundation has sufficient capacity. Stateful data remains the responsibility of the bound service and its operator.
What do Cloud Foundry’s savings and speed figures mean?
Cloud Foundry’s own “Why Cloud Foundry” page reports an average application development lifecycle of 10 weeks and average savings of $100,000 per application development cycle. These are vendor-reported marketing claims; the cited material does not provide an independent methodology or third-party validation. Treat them as illustrative claims, not guaranteed results or industry benchmarks, and measure your own lead time and operating cost before making a business case.
Where can Cloud Foundry run?
Cloud Foundry can be deployed on an organization’s infrastructure or on IaaS such as VMware vSphere, Amazon Web Services, Microsoft Azure, Google Cloud Platform, and OpenStack. BOSH provides the deployment and lifecycle layer that coordinates the platform’s VMs and supporting services on those foundations.
The target matters operationally. A managed service may remove control-plane maintenance but constrain versions and customization; a self-managed installation provides more control but requires staff for upgrades, capacity, networking, identity, backups, and incident response. Compare those responsibilities before treating two offerings as equivalent.
Korifi is the Cloud Foundry project for bringing Cloud Foundry capabilities to Kubernetes. That integration can let teams preserve an application-centric developer experience while an organization standardizes on Kubernetes infrastructure, but it does not erase differences in storage classes, networking, cluster policy, observability, or service integrations. Validate the supported Korifi and Kubernetes versions with the chosen provider.
What is the difference between Cloud Foundry and Kubernetes?
Cloud Foundry is an application platform with a high-level developer workflow; Kubernetes is a lower-level container orchestration platform. Kubernetes gives teams primitives for scheduling containers and composing platform services, while Cloud Foundry supplies stronger conventions for source-to-application delivery. They can be alternatives for a platform strategy or layers in the same organization, especially when Cloud Foundry capabilities are delivered through Korifi.
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| Comparison axis | Cloud Foundry | Kubernetes |
|---|---|---|
| Developer abstraction | Push application source or a packaged app; the platform stages and runs it. | Define container images, workloads, services, ingress, and policies, unless a higher-level platform is added. |
| Operator workload | Operate a PaaS control plane, buildpacks, foundations, brokers, quotas, and underlying VMs or infrastructure. | Operate clusters, nodes, networking, storage, controllers, add-ons, upgrades, and the application platform layered on top. |
| Runtime model | Buildpacks and stacks produce droplets for supported runtimes. | Containers are the primary packaging unit; teams choose images and image-build tooling. |
| Service integration | Marketplace offerings and Open Service Broker API bindings are central to the workflow. | Service catalogs and operators vary by distribution; integration is flexible but less uniform by default. |
| Portability | Designed to separate application workflows from the underlying foundation, subject to provider compatibility. | Widely available across clouds and data centers, but manifests, storage, ingress, and add-ons can be environment-specific. |
| Best fit | Teams prioritizing a curated, self-service path from code to application. | Organizations needing fine-grained container orchestration and willing to build or adopt additional platform layers. |
Choose based on the amount of platform engineering you want application teams to perform, not on the popularity of either project. A team that needs custom scheduling, sidecars, operators, or unusual networking may value Kubernetes primitives; a team that wants a governed push workflow may be more productive with Cloud Foundry.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should you verify before adopting Cloud Foundry?
“Cloud Foundry” describes a project and ecosystem, not one identical commercial product. Compare the actual distribution, release, and operator capabilities using this checklist:
- Buildpacks and versions: Confirm the languages, runtime versions, native libraries, and custom-buildpack policy your applications need.
- Service catalog: List the databases, queues, object storage, identity, and SaaS integrations available in each environment, including backup and restore responsibilities.
- Infrastructure support: Check whether the provider supports your chosen on-premises or public-cloud foundation and how upgrades are scheduled.
- Identity and network controls: Verify SSO, role mapping, private routes, outbound restrictions, certificates, and audit-log retention.
- Observability: Establish where application logs, platform metrics, events, and traces go, and how long they are retained.
- Capacity and resilience: Review quotas, VM types, availability zones, rolling-deployment behavior, and recovery procedures.
- Kubernetes integration: If you need it, confirm the supported Korifi release, Kubernetes versions, storage drivers, ingress model, and feature gaps.
- Exit and portability: Document how to export application source, configuration, build artifacts, and service data if you change providers.
What problems commonly occur, and how do you troubleshoot them?
The push fails during staging
Check the buildpack list and the staging logs first. An unsupported language version, missing native dependency, incompatible stack, or insufficient staging disk can stop a build before an application process starts. Pin a compatible runtime, remove unnecessary files, or ask the operator whether the required buildpack and stack are available.
The application starts but the route returns an error
Use cf app APP-NAME to verify that instances are running and a route is mapped. Then inspect recent logs. Many applications bind only to localhost or listen on a hard-coded port; Cloud Foundry applications must listen on the port supplied by the platform, commonly through the PORT environment variable.
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A service binding is present but the application cannot connect
Confirm that the service instance reached a provisioned state, the application was actually bound, and the broker supplied credentials in the expected environment structure. Network allowlists, TLS requirements, expired credentials, or a provider-specific client library can be the cause even when cf services shows a successful binding.
Scaling adds instances but performance does not improve
More instances help only when requests can run concurrently and the bottleneck is application capacity. Check database connections, external APIs, shared locks, memory pressure, and route distribution. A single-threaded process, an undersized database, or a slow dependency may require code or service changes rather than more application instances.
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How is Cloud Foundry governed?
The Cloud Foundry Foundation operates under Linux Foundation guidance. Its charter identifies support for open-source PaaS projects and names Cloud Foundry, Paketo, and the Open Service Broker API among the initial projects. Around those projects is an ecosystem of distributions, buildpacks, brokers, tutorials, and training. Governance and ecosystem breadth can help with skills and integrations, but evaluate the support model, release cadence, and long-term maintenance commitments of the specific provider you plan to use.
Frequently Asked Questions
Can Cloud Foundry run without Kubernetes?
Yes. Traditional Cloud Foundry deployments run on infrastructure managed through BOSH, including private virtualization and several public-cloud IaaS options. Kubernetes is one possible foundation through Korifi, not a prerequisite for the platform.
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Do I need to write a Dockerfile for a Cloud Foundry application?
Usually not. Buildpacks inspect the source and assemble the runtime and dependencies into a droplet, so a supported application can be pushed without a Dockerfile. Teams that need an unusual runtime can use an operator-approved custom buildpack or a platform capability that accepts a prebuilt image, if their distribution enables it.
How are secrets handled after a service is bound?
A service broker returns connection details through the platform’s binding mechanism rather than requiring credentials in source code. The exact environment-variable format and rotation behavior vary by broker, so verify masking, rotation, access control, and audit requirements with the service provider.
Is Cloud Foundry suitable for stateful applications?
The application processes themselves are designed to be replaceable, so durable state should live in a bound database, object store, or other managed service. Stateful workloads can be exposed through brokers, but backup, replication, failover, and data migration remain responsibilities that must be confirmed for that service.
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