Kubernetes Best Practices for Ingress, Cluster Separation, and Storage
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MellowCedar47
We're preparing an on-premises Kubernetes environment on a powerful internal server and are deciding how to structure it. First, is it advisable to expose a database's web-based administration interface through an Ingress controller or reverse proxy such as NGINX or Traefik, even if it is only reachable from the company network? What additional security controls would still be necessary? Second, should infrastructure services such as databases, monitoring, and internal tools run in the same cluster as our applications, or should they be separated into different clusters? If everything shares one cluster, how should we think about the potential failure or blast radius? Finally, what storage approach is generally recommended: HostPath, the default StorageClass, or a distributed solution such as Longhorn?
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For a database GUI, I’d avoid exposing the database service itself through Ingress. Keep the database private and provide access to a separate administrative interface through a VPN, port-forwarding, or an authenticated internal service. An Ingress or reverse proxy does not automatically make anything secure—you still need strong authentication, authorization, TLS, network restrictions, and ideally SSO or another identity provider. Treat every exposed endpoint as part of your attack surface, even on an internal network.
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For on-premises persistent storage, HostPath is generally unsuitable for important workloads because it ties data to one node and does not provide convenient replication or failover. A distributed option such as Longhorn can be a practical choice for a small team because it provides replicated volumes and relatively straightforward operations. Make sure you also configure backups to an S3-compatible or other independent storage target—replication inside the cluster is not a substitute for backups. In cloud environments, the provider’s CSI-backed StorageClass is usually the simplest default, while on-premises deployments should choose based on reliability, recovery requirements, operational complexity, and available hardware.
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A single cluster with separate namespaces for infrastructure, applications, and environments is a reasonable starting point for a small team. Split into multiple clusters when you need stronger isolation, different upgrade schedules, compliance boundaries, dedicated environments, or protection from one workload affecting another. If the only cluster fails, everything hosted there can become unavailable, so plan for backups, monitoring, tested recovery procedures, and possibly a separate management or disaster-recovery environment. Many teams eventually use separate production and development or testing clusters rather than one cluster per application.
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MellowCedar47: That makes sense. Since we currently have one main server, we’ll probably start with one cluster and use namespaces and resource limits, while documenting a future separation plan if the blast radius becomes a concern.