Reducing Vendor Lock: Implementing Cloud-Agnostic Architecture

This doesn't mean you must abandon managed services everywhere. Use managed PostgreSQL — just document the SQL extensions and specific parameters that need to be reconfigured for another provider.

Terraform with Provider Abstraction

Pattern — common interface via variables + switching implementation via workspace or var.

# modules/kubernetes-cluster/variables.tf
variable "provider_type" {
  type = string
  # "aws" | "gcp" | "azure"
}

variable "cluster_name" {
  type = string
}

variable "node_pools" {
  type = list(object({
    name          = string
    instance_type = string
    min_size      = number
    max_size      = number
  }))
}

Implementations per provider in separate files:

modules/kubernetes-cluster/
  variables.tf   # common interface
  outputs.tf     # common outputs
  aws.tf         # EKS resources (only if var.provider_type == "aws")
  gcp.tf         # GKE resources
  azure.tf       # AKS resources

Conditional logic via count = var.provider_type == "aws" ? 1 : 0 for each resource block.

Helm Charts without Provider Annotations

Example values.yaml structure for cloud-agnostic deployment:

ingress:
  enabled: true
  className: nginx # not "alb", not "gce"
  annotations: {} # empty by default, overridden in values-aws.yaml
persistence:
  storageClass: "" # default StorageClass of the cluster
  size: 10Gi
serviceAccount:
  annotations: {} # IRSA / Workload Identity – in overlay, not base

In values-aws.yaml — add AWS-specific items, in values-gcp.yaml — GCP. The base chart remains clean.

External Secrets Operator as a Universal Secrets Layer

ESO acts as a bridge between Kubernetes and any secrets backend. The application reads a standard Kubernetes Secret; ESO syncs it from the appropriate backend:

---
apiVersion: external-secrets.io/v1beta1
kind: SecretStore
metadata:
  name: aws-secrets
spec:
  provider:
    aws:
      service: SecretsManager
      region: us-east-1
      auth:
        jwt:
          serviceAccountRef:
            name: external-secrets-sa
---
# For GCP – change only spec.provider:
# provider:
#   gcpsm:
#     projectID: my-project

ExternalSecret objects are identical for both providers. Only the SecretStore changes. Applications are unaware of where the secrets come from.

Practical: What to Do with Object Storage

S3-compatible API is the standard. GCS, MinIO, Backblaze B2, Cloudflare R2 — all support it. Write application code using boto3 or AWS SDK with endpoint_url:

import boto3
s3 = boto3.client(
    's3',
    endpoint_url=os.environ['STORAGE_ENDPOINT'],  # https://storage.googleapis.com
    aws_access_key_id=os.environ['STORAGE_ACCESS_KEY'],
    aws_secret_access_key=os.environ['STORAGE_SECRET_KEY'],
)

STORAGE_ENDPOINT is the only thing that changes when switching providers.

Why Cloud-Agnostic Doesn't Solve Everything

Don't expect that a cloud-agnostic architecture will let you migrate in a day. Some things will remain provider-specific regardless: monitoring, logging, traffic pricing, support model. The goal is to reduce the migration scope to the infrastructure-as-code layer and a few configuration files, not to rewriting applications. A multi-cloud strategy is only effective with proper abstraction.

What's Included in the Work

We guarantee audit results: you'll receive a document listing all vendor lock points with recommendations. Our certified Kubernetes and Terraform specialists provide:

• Audit of the current stack, identifying vendor lock points.
• Migration roadmap with effort estimation.
• Development of provider-neutral Terraform modules and Helm charts.
• Setup of External Secrets Operator and S3-compatible storage.
• Documentation of the migration process for each provider.
• Training your team on the cloud-agnostic approach.
• Support during the migration phase (2–4 weeks after completion).

We offer comprehensive DevOps consulting for implementing cloud-agnostic architecture. Get a consultation from our engineer — we'll assess your project within 2 days.

Timeframe Estimates

Cost is calculated individually after auditing the current stack and assessing the degree of vendor lock. Contact us for an assessment within 2 days and an optimal solution.