vault-template

Render templated config files with secrets from HashiCorp Vault. Inspired by vaultenv.

• Define a template for your config file which contains secrets at development time.
• Use vault-template to render your config file template by fetching secrets from Vault at runtime.

Usage

Usage of ./vault-template:
  -o, --output string             The output file.
                                  Also configurable via OUTPUT_FILE.
  -t, --template string           The template file to render.
                                  Also configurable via TEMPLATE_FILE.
  -v, --vault string              Vault API endpoint.
                                  Also configurable via VAULT_ADDR.
                                  (default "http://127.0.0.1:8200")
  -f, --vault-token-file string   The file which contains the vault token.
                                  Also configurable via VAULT_TOKEN_FILE.

A docker image is availabe on Dockerhub.

Template

First of all, suppose that the secret was created with vault write secret/mySecret name=john password=secret.

The templates will be rendered using the Go template mechanism.

Currently vault-template can render four functions:

• vault
• vaultMap
• toYaml
• fromYaml

Also it is possible to use environment variables like {{ .STAGE }}.

The vault function takes two string parameters which specify the path to the secret and the field inside to return.

mySecretName = {{ vault "secret/mySecret" "name" }}
mySecretPassword = {{ vault "secret/mySecret" "password" }}

mySecretName = john
mySecretPassword = secret

The vaultMap function takes one string parameter which specify the path to the secret to return.

{{ range $name, $secret := vaultMap "secret/mySecret"}}
{{ $name }}: {{ $secret }}
{{- end }}

name: john
password: secret

More real example:

---
# Common vars
{{- $customer    := .CUSTOMER }}
{{- $stage       := .STAGE }}
{{- $project     := .PROJECT }}
{{- $postgres    := print "kv/data/" $customer "/" $stage "/" $project "/postgres" }}
{{- $postgresMap := vaultMap $postgres }}

postgresql:
  postgresqlUsername: {{ $postgresMap.data.user }}
  postgresqlPassword: {{ $postgresMap.data.password }}
  postgresqlDatabase: {{ $postgresMap.data.db }}

app:
  postgres:
{{ range $name, $secret := $postgresMap }}
    {{ $name }}: {{ $secret }}
{{- end }}

And command that use this template in kubernetes:

CUSTOMER=internal STAGE=test PROJECT=myprj vault-template -o values.yaml -t values.tmpl -v "http://vault.default.svc.cluster.local:8200" -f token