Kubernetes 是你的私有云
Kubernetes Is Your Private Cloud

原始链接: https://oneuptime.com/blog/post/2025-11-12-kubernetes-is-your-private-cloud/view

最初,作者们被公有云基础设施的易用性所吸引,但随后发现成本失控、支持不透明,且创新受到供应商的限制。他们发现 Kubernetes 提供了一种强大的替代方案:一个用于构建私有云的可编程基础。 Kubernetes 提供了与公有云相同的基础云功能——弹性计算、持久存储、托管数据库等——但*没有*供应商锁定。通过利用 Rook/Ceph 和 CloudNativePG 等开源工具,他们获得了对计算位置、数据驻留和可预测预算的控制权。 这种转变使团队能够掌控自己的路线图,并优先考虑弹性、合规性和成本效益。虽然管理基础设施需要对自动化进行投资,但成熟的工具(如基础设施即代码和 Operators)现在简化了这一过程。Kubernetes 并没有完全取代公有云,而是将其重新定义为一种*选择*,而不是必需品,使组织能够在他们真正控制的基础设施上构建。

## Kubernetes 作为私有云:一个质疑性的讨论 一篇最近的文章提出 Kubernetes 可以作为私有云使用,在 Hacker News 上引发了争论。虽然这个想法对那些寻求云功能但又希望拥有更多控制权的人来说很有吸引力,但许多评论者表达了怀疑。 反对“自托管 Kubernetes”的核心论点在于它引入的运营开销。用户指出,有效地运行 Kubernetes 需要管理任务——运维、安全、可扩展性、升级——而这些通常由云提供商处理。人们对升级的复杂性(每个 3 个月一次的 operators 和 manifests)以及对专业知识的需求表示担忧。 一些人认为 Kubernetes 在需要快速部署的小团队中表现出色,但大型组织应该考虑使用基础设施即服务 (IaaS)。 还有人强调了即使*使用* Kubernetes 也可能导致组织混乱,并指出它仍然可能导致复杂的配置。 一些评论员提倡更简单的替代方案,如 Proxmox 或 Podman,质疑 Kubernetes 的好处是否超过其固有的复杂性,适用于许多用例。一种反复出现的情绪是,Kubernetes 经常解决一个根本不存在的问题(“需要一个云”)。
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原文

We anchored our infrastructure on the public cloud because everyone else seemed to do it. Swipe a credit card, spin up managed everything, ship features. It felt easy—until the bill ballooned, incidents were gated behind opaque support tickets, and our roadmap got blocked by API rate limits we couldn't change. Public cloud made our product possible, but it also made our fate dependent on someone else.

Kubernetes changed that. Once you see it for what it really is—a programmable substrate over servers, storage, and networks—you realize the public cloud never had a monopoly on innovation. A Kubernetes cluster is your cloud. You decide where it runs, what it costs, how it scales, and who touches your data.

Everything You Expect from a Cloud, Running on Your Terms

Kubernetes gives you the same building blocks the hyperscalers market as differentiated magic. Here's the short list of what you already have access to today:

  • Need elastic compute? Schedule containers as pods across your nodes. Horizontal pod autoscalers and cluster autoscaling keep capacity fluid without vendor lock-in.
  • Need durable storage? Deploy Rook + Ceph for multi-copy, self-healing block and object storage. It behaves like EBS and S3, only this time the drives are literally yours.
  • Need a rock-solid database? Operators like CloudNativePG deliver managed PostgreSQL complete with automated failover, backups, and rolling upgrades.
  • Need service discovery, secrets, observability, AI workloads? Kubernetes natively gives you service mesh integrations, sealed secrets, OpenTelemetry tooling, GPU scheduling, and more. No "proprietary edge" required.

The pattern is simple: everything you can do on someone else's cloud already exists, open-sourced, automated, and production-ready. You aren't waiting on a provider roadmap anymore—you are the roadmap.

Your Data, Your Compliance, Your Sleep Schedule

Owning the stack means:

  • Your compute lives where you want it. In a colo, on bare metal, across rented dedicated hosts—pick the geopolitics and latency profile that keeps your customers and regulators happy.
  • Your data never leaves your blast radius. No silent replication to third-party regions, no subpoenas you never see, no shared responsibility confusion.
  • Your budgeting is tangible. Servers, racks, power—predictable line items, not roulette-wheel invoices that spike the moment adoption takes off.

When you treat Kubernetes as the control plane for your private cloud, you make intentional tradeoffs. You invest in automation once, then compound the returns forever. The result: more resilience, more leverage, less anxiety.

Read our Story of Moving from AWS to Bare-Metal Kubernetes

This autonomy is a superpower for small teams. We detailed the financial side of this journey in How moving from AWS to Bare-Metal saved us $230,000 /yr. The cultural unlock has been even bigger.

But Isn't Running It Yourself Harder?

Sure, there is real work involved in standing up bare-metal clusters, HA control planes, and storage replication. The difference in 2025 is that the tooling has matured beyond belief:

  • Infrastructure as code spins up clusters with GitOps pipelines instead of click-ops.
  • Operators replace runbooks with Kubernetes-native automation for databases, queues, observability, and more.

The question is no longer "can we run it?" It's "do we want to own our destiny?" If the answer is yes, the execution playbook already exists.

Own the Future You Are Building

Kubernetes doesn't eliminate the public cloud; it commoditizes it. You can still burst workloads into AWS, GCP, or Azure when it makes sense. The difference is that you aren't trapped there. Your default state is sovereignty, and the public cloud becomes a tactical extension—not your foundation.

Build your private cloud with Kubernetes. Plant your flag on infrastructure you control. Your team, your customers, and your balance sheet will all breathe easier when your innovation no longer depends on someone else's priorities.

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