Teller

What Teller is

Teller is an open-source secret manager for developers working with secrets during development, testing, and app builds. It connects to vaults, key stores, and cloud services for managing secrets across individual environments or team workflows. Named integrations include HashiCorp Vault, AWS Secrets Manager, Google Secret Manager, HashiCorp Consul, AWS SSM, dotenv providers, etcd, and an in-memory store. The `teller run` command can launch a subprocess with variables fetched through Teller, and `teller env` can provide a Docker `--env-file`. It can scan code for secrets and return exit code 1 in CI when `--error-if-found` detects one. Teller can also redact secrets from process output, logs, live log tails, and files. Provider mappings can specify a root path, mapping ID, and optional key renames; configuration templates can use environment variables. The project describes copying, syncing, writing, and deleting provider values, though write operations depend on provider support. It is available for Linux, macOS, and Windows under the Apache-2.0 license.