As an expert full-stack developer and DevOps engineer, I often get asked how platforms like Red Hat‘s OpenShift and OpenStack compare for developing, deploying and managing modern cloud-native applications. This comprehensive guide provides an insider‘s look at the key differences and use cases of these technologies from both a developer and infrastructure perspective.
A Full-Stack Developer‘s Perspective
As a full-stack developer, my primary concern is building and running applications efficiently. I need to continuously integrate code, run tests, fix bugs, deploy new versions, and scale infrastructure up or down based on load. Platforms like OpenShift are appealing because they simplify these operational aspects through built-in automation and container technology.
When evaluating PaaS solutions, some key criteria I consider are:
Application Centric: The platform should directly help me code, test, integrate and run applications without needing to manage servers and infrastructure. OpenShift provides this by packaging code into Docker containers and handling deployment minutiae automatically.
Developer Productivity: I want a consistent environment and tooling that‘s instantly familiar. OpenShift provides this through its developer-centric web console and facilities like instant application scaffolding from code repos. OpenStack is more focused on infrastructure management.
Polyglot Support: The ability to use different languages and frameworks is important, especially for microservices. OpenShift has great support for Java, Node.js, Python, Ruby, PHP, Perl and more.
CI/CD Integration: Built-in CI/CD capabilities speed up tasks like builds, tests, and promotions between dev, test, prod. OpenShift has out-of-the-box integration with Jenkins, GitHub, BitBucket.
Operational Simplicity: Infrastructure should run smoothly without my constant intervention. OpenShift takes care of scaling, upgrades, high availability (HA), health monitoring instead of me having to wire together disparate tools.
Multi-Cloud Portability: No vendor lock-in to a specific infrastructure provider lets me run anywhere. OpenShift provides consistency across on-prem, AWS, Azure, Google Cloud, and more.
Evaluated on these criteria, OpenShift streamlines the entire application lifecycle – from development to delivery – in a portable manner across environments. The rest of this guide looks at OpenShift‘s capabilities from an infrastructure perspective as well.
An Infrastructure Architect‘s View
As someone responsible for managing infrastructure and platforms, choosing the right foundation for application workloads is vital. I need to standardize environments, achieve operational efficiency and scale seamlessly. Core considerations include:
Self-Service Provisioning: Users should self-serve infrastructure needs without tickets or delays. Both OpenStack and OpenShift enable this through APIs and web consoles.
Multi-Tenancy: Secure isolation ensures teams only access sanctioned resources. OpenStack uses identity management and access controls. OpenShift provides project/organization separation.
High Availability: Automatic failover and redundancy for infrastructure and applications minimize disruptions during outages. OpenShift leverages underlying Kubernetes capabilities here.
Interoperability: Support for open standards prevents vendor lock-in. Both OpenStack and OpenShift leverage open source, Linux, containers ensuring no proprietary obfuscation.
Hybrid Cloud: A mix of on-prem and public cloud allows choice. OpenStack provides infrastructure across environments. OpenShift adds container portability between them.
Cost Efficiency: Commodity infrastructure and competition help lower costs. Both OpenStack and OpenShift run on affordable x86 servers and leverage open source IP.
Skill Reuse: Consistent tooling allows reapplying existing expertise. Kubernetes basis means container skills apply to OpenShift. OpenStack admin knowledge transfers across version upgrades.
Automation: Policy-driven management cuts manual processes. OpenStack autoscales infrastructure. OpenShift handles container deployments and app release cycles.
Together, OpenStack and OpenShift provide a cloud-ready application platform addressing critical development, operations and business needs like time-to-market, availability, choice, efficiency and scale.
Detailed Architecture Comparison
Delving deeper into OpenShift and OpenStack architectures reveals how the platforms complement each other from infrastructure through the application layers:
Combined OpenStack and OpenShift Architecture (Image Source: Author)
OpenStack Architecture
As an IaaS, OpenStack provides the core compute, storage and network resources needed to run workloads. Major services like Nova, Neutron, Cinder, Glance and Swift manage VMs, networking, volumes, images and objects. Additional components provide authentication, messaging, database and load balancing functions.
The architecture allows massive horizontal scale-out. Loose coupling between services eases updates. APIs enable full infrastructure automation. OpenStack gives IT control and flexibility to deploy whatever applications they need on top.
OpenShift Architecture
OpenShift adds application management and container orchestration capabilities on top of infrastructure foundations like OpenStack. It uses a Kubernetes architecture consisting of master nodes directing workload distribution across application nodes all driven through a declarative API.
Key components include:
Master Services: Handle cluster management, provide the API endpoint and orchestrate scheduling/routing.
Nodes: Docker containers representing microservices and applications deployed from CI/CD pipelines.
Pods: One or more containers representing a single logical application unit.
Services: Enable pods serving an app to be addressed as a group for load balancing.
Builds & Deployments: Automate container image construction from source and rollout of updates.
Additional capabilities like software-defined networking, integrated container registries, log aggregation, monitoring, and centralized authentication enforce consistency and increase productivity.
Combined, OpenStack and OpenShift provide an enterprise-grade cloud-native application platform spanning infrastructure through app deployment, networking, management and orchestration.
Comparing Use Cases and Maturity
Maturity and Adoption
As background, it helps comparing how long OpenStack and OpenShift have been around:
OpenStack: Initially released in 2010. Provide IaaS capabilities early on. Has seen massive scale production deployments at companies like Rackspace, Comcast, Bloomberg. Over 200 global enterprises rely on OpenStack.
OpenShift: First launched in 2011 as a PaaS focused on developer productivity. Re-architected in 2018 leveraging Kubernetes and containers. Production hardened through customers like Macquarie Bank, Santander, Deutsche Bank running regulated workloads.
Both have proven large real-world deployments and reference architectures across 10 years. OpenShift benefits from Kubernetes and container maturity curves with OpenStack pioneering infrastructure automation.
Use Cases
OpenStack Core Use Cases
- Building scalable private and public cloud platforms
- Running both cloud-native and legacy virtual machine based workloads
- Abstracting compute, network and storage infrastructure into pools of resources
- Enabling multi-tenancy through quotas, directories and role based access controls
- Avoiding vendor lock-in using open standards for all services
OpenShift Core Use Cases
- Hosting and managing containerized and Kubernetes-based applications
- Building CI/CD pipelines with integrated Jenkins automation
- Streamlining infrastructure provisioning using Infrastructure-as-Code techniques
- Deploying scale-out microservices applications through automation
- Binding configuration to containers for increased portability
- Scaling deployments across public, private and hybrid clouds
The use cases are complementary with OpenShift leveraging dynamic resources provided by OpenStack infrastructure foundations.
Comparing Benefits and Limitations
OpenShift Benefits
Streamlined Application Management
- Automates deployments using Git push, containers, CI/CD
- Integrates registry, builds, deployments
- Packages apps with dependencies for simplified movement
Improved Productivity
- Scaffolds cloud-native applications from web GUI
- Embed operational best practices out-of-the-box
- Integrates with GitHub, Jenkins, Quay, GitLab
Kubernetes-based Portability
- Runs applications consistently across footprints
- Encapsulates full environment in containers
- Designed for microservices and scale-out architectures
Multi-Cloud Flexibility
- Supports all major public cloud providers
- Provides single control plane across environments
- Easy migration into or between clouds
OpenShift Limitations
No Infrastructure Services
- Focused on application management rather than provisioning servers, storage and networks
- Needs underlying infrastructure platform for full solution
- Integrates with OpenStack for infrastructure automation
Learning Curve
- Developer simplicity but operations is complex under the hood
- Kubernetes basis means new operational model to learn
- May conflict with existing VM-based management tools
Resource Overhead
- Additional layers like Kubernetes, containers increase overhead
- Careful tuning needed around pod densities, replicas etc.
- Complex troubleshooting compared to monoliths
Evolving Market
- Relatively new technology stack brings maturity risks
- Rapid evolution as Kubernetes continues to develop
- Competitive landscape still taking shape
OpenStack Benefits
Infrastructure Flexibility
- Provisions and manages virtualized infrastructure at scale
- Supports both stateful and stateless workloads
- Handles legacy applications and cloud-native
Avoid Vendor Lock-in
- Services expose standard REST APIs with JSON/XML
- No proprietary or custom interfaces
- Community-driven open source governance
Production Hardening
- Robust reference architectures based on real-world experience
- Battle-tested reliability, availability, recoverability
- Broad ecosystem compatibility and support
Skill and Tool Reuse
- Aligns with existing virtualization expertise
- Reuses familiar tools like Ansible, Packer, Terraform
- Broad community and tutorial content
OpenStack Limitations
Complexity
- Myriad of projects and capabilities adds learning curve
- Conceptually deep networking, storage layers
- Careful design needed for multi-tenancy, scale
No Full Solution
- Focused on infrastructure automation
- Still needs apps, containers, orchestration built or integrated
Upgrades Challenging
- Loosely coupled architecture makes version upgrades difficult
- Backward compatibility concerns across services
- Disciplined devops processes essential
Select Vendor Dependencies
- Some vendor specific customizations like drivers, SDN plugins
- AWS provides managed alternative with proprietary IP
- Google Anthos competes using Kubernetes backend
OpenStack and OpenShift naturally offset each other‘s disadvantages. OpenStack receives orchestration while OpenShift gets infrastructure.
Comparing Architectural Fit
OpenShift and OpenStack align well architecturally since they occupy adjacent layers:
Mapping OpenStack and OpenShift to Infrastructure Layers
Infrastructure Layer: OpenStack provides the core network, compute and storage building blocks – both physical and virtualized. OpenShift leverages these resources.
Orchestration Layer: OpenShift adds container orchestration, management and automation of infrastructure provided by OpenStack underneath.
Application Layer: Developer-focused capabilities in OpenShift simplify deploying applications using Kubernetes constructs.
Tooling Layer: Integrated CI/CD, monitoring and configuration tooling increase end-user productivity in OpenShift. OpenStack focuses purely on infrastructure.
This division of responsibility plays well to the strengths of both platforms. The infrastructure foundation benefits from container portability and orchestration while staying vendor neutral.
Comparing Architectures Visually
The following provides a visual overview contrasting OpenStack and OpenShift architectures:
OpenStack Architecture (Image Source: Cloud Sigma)
OpenShift 4.0 Architecture (Image Source: Red Hat)
Observe how OpenStack focuses on infrastructure resources – compute, network, storage. OpenShift centers on containerized applications using Kubernetes principles like pods, deployments and services. Integrating them provides the right foundation and workload portability.
Summary Comparison
| OpenStack | OpenShift | |
|---|---|---|
| Category | Infrastructure-as-a-Service | Container Application Platform |
| Focus | Managing virtualized infrastructure and networking | Deploying and hosting containerized applications |
| Typical Users | Infrastructure architects, system administrators | Software developers, DevOps engineers |
| Core Components | Nova, Neutron, Cinder, Glance, Swift | Master, nodes, containers, services, routes |
| Key Use Cases | Building public/private clouds; | Container orchestration; CI/CD automation; |
| Strengths | Infrastructure flexibility and automation; Multi-tenant scale; Avoiding lock-in | Developer productivity; Kubernetes portability; Integrated toolchain |
| Limitations | Complexity; Version upgrades; Learning curve | Infrastructure dependency; Resource overhead; Operational maturity |
| Learning Curve | Steep – Linux, virtualization, networking skills | Developer friendly but operational complexity |
Together OpenStack and OpenShift closely align from infrastructure through the application layers – filling each other‘s gaps while benefiting from common open source DNA.
Conclusion
This comprehensive guide reflects my real-world experience leveraging both OpenStack and OpenShift for full-stack development and infrastructure management. While they originate from the same vendor – Red Hat – the technologies are independent, adjacent and complementary.
OpenStack excels at transforming hardware into flexible resource pools providing network-accessible compute, storage and networking. It offers choice, automation and avoids lock-in crucial for infrastructure owners.
OpenShift adds container application portability through Kubernetes and simplified orchestration, deployments plus an integrated CI/CD toolchain. This increases developer productivity in building modern cloud-native, microservices driven applications.
However, OpenShift relies on infrastructure and abstracted resources for running container workloads. OpenStack depends on external application runtimes, containers and orchestration to utilize provisioned infrastructure.
Together they provide an attractive, open source, enterprise-grade cloud application platform. OpenStack handles infrastructure demands while OpenShift streamlines application delivery – both essential for businesses seeking IT agility and digital transformation.
