How to Deploy HashiCorp Vault in Kubernetes Without Writing Tons of YAML Manifests

Anyone who has tried to set up HashiCorp Vault in a Kubernetes cluster manually remembers the endless assembly of Deployments, StatefulSets, ConfigMaps, TLS secrets, and sidecar containers. One misplaced indentation in a YAML file — and your applications lose access to databases.

The official vault-helm chart solves this problem. HashiCorp engineers packaged the secrets manager deployment into a single chart that covers everything from a local development environment to a distributed HA cluster.

Why Use This Chart in the First Place?

The repository has become the standard for running Vault inside Kubernetes. You don't need to write pod specifications from scratch or figure out how to mount storage for the built-in Raft consensus. The settings are already baked into the values.yaml configuration file.

The tool is useful for DevOps engineers and system administrators who organize secret storage in their infrastructure. If your services need API keys, database credentials, or TLS certificates, the chart helps you deploy a reliable vault in a matter of minutes.

Key Features

The chart developers anticipated the main use cases:

• Quick switching between operation modes You can switch an instance from standalone mode to a fault-tolerant cluster through configuration parameters. For local testing, a minimal values file is sufficient, while production environments enable built-in Raft or an external database.

• Secret injection via Vault Agent Injector Your application no longer needs to know how to work with the vault's REST API. The injector automatically adds a sidecar container to the pod. This container retrieves secrets and saves them to the pod's local filesystem. The application reads data from the file without ever interacting with the Vault network.

• Authentication through Kubernetes Auth Engine The chart integrates with the Kubernetes authorization mechanism. The vault verifies pod service accounts and delivers secrets only to authorized applications.

• Component separation You can deploy the server side, agents, and injector separately. This helps you move the Vault server outside the main application or run only lightweight agents on worker nodes.

How to Deploy the Vault

You'll need a running Kubernetes cluster version 1.29 or newer and Helm version 3.6+ installed. Setting up a basic release instance takes just two commands:

helm repo add hashicorp https://helm.releases.hashicorp.com
helm install vault hashicorp/vault

For a real environment, standard settings are usually not enough. You'll need a custom parameters file, for example custom-values.yaml:

server:
  ui:
    enabled: true
  dataStorage:
    enabled: true
    size: 10Gi

injector:
  enabled: true

Deploy the chart with the assembled parameters:

helm install vault hashicorp/vault -f custom-values.yaml

After that, you just need to access the running pod, run the vault operator init command, and unseal the vault.

Operational Considerations

The values.yaml configuration file contains hundreds of options. Figuring them out on the first try can be challenging, so prepare to spend time reading the official documentation.

The second point concerns unsealing the vault after restarts. By default, Vault starts in a sealed state. For production use, it's better to configure Auto-Unseal through cloud KMS services right away, otherwise you'll have to enter keys manually after every pod crash.

Who Is This Tool For

If you work with Kubernetes and plan to implement centralized secret management, this chart will save you weeks of work on your own manifests.

Start by deploying a test instance in an isolated namespace. Try adding injector annotations to a simple test application and see how secrets make their way into the container without any changes to your source code.