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+# Vault
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+
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+Vault is a tool for securely accessing secrets. A secret is anything that you want to tightly control access to, such as API keys, passwords, certificates, and more. Vault provides a unified interface to any secret, while providing tight access control and recording a detailed audit log. For more information, please see:
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+
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+- [Vault documentation](https://www.vaultproject.io/)
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+- [Vault on GitHub](https://github.com/hashicorp/vault)
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+
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+%%LOGO%%
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+
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+# Using the Container
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+
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+We chose Alpine as a lightweight base with a reasonably small surface area for security concerns, but with enough functionality for development and interactive debugging.
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+
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+Vault always runs under [dumb-init](https://github.com/Yelp/dumb-init), which handles reaping zombie processes and forwards signals on to all processes running in the container. This binary is built by HashiCorp and signed with our [GPG key](https://www.hashicorp.com/security.html), so you can verify the signed package used to build a given base image.
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+
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+Running the Vault container with no arguments will give you a Vault server in [development mode](https://www.vaultproject.io/docs/concepts/dev-server.html). The provided entry point script will also look for Vault subcommands and run `vault` with that subcommand. For example, you can execute `docker run vault
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+status` and it will run the `vault status` command inside the container. The entry point also adds some special configuration options as detailed in the sections below when running the `server` subcommand. Any other command gets `exec`-ed inside the container under `dumb-init`.
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+
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+The container exposes two optional `VOLUME`s:
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+
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+- `/vault/logs`, to use for writing persistent audit logs. By default nothing is written here; the `file` audit backend must be enabled with a path under this directory.
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+- `/vault/file`, to use for writing persistent storage data when using the`file` data storage plugin. By default nothing is written here (a `dev` server uses an in-memory data store); the `file` data storage backend must be enabled in Vault's configuration before the container is started.
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+
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+The container has a Vault configuration directory set up at `/vault/config` and the server will load any HCL or JSON configuration files placed here by binding a volume or by composing a new image and adding files. Alternatively, configuration can be added by passing the configuration JSON via environment variable `VAULT_LOCAL_CONFIG`. Please note that due to a bug in the current release of Vault (0.6.0), you should *not* use the name `local.json` for any configuration file in this directory.
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+
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+## Running Vault for Development
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+
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+```console
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+$ docker run -d --name=dev-vault vault
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+```
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+
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+This runs a completely in-memory Vault server, which is useful for development but should not be used in production.
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+
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+When running in development mode, two additional options can be set via environment variables:
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+
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+- `VAULT_DEV_ROOT_TOKEN_ID`: This sets the ID of the initial generated root token to the given value
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+- `VAULT_DEV_LISTEN_ADDRESS`: This sets the IP:port of the development server listener
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+
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+As an example:
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+
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+```console
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+$ docker run -e 'VAULT_DEV_ROOT_TOKEN_ID=myroot' -e 'VAULT_DEV_LISTEN_ADDRESS=127.0.0.1:1234' vault
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+```
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+
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+## Running Vault in Server Mode
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+
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+```console
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+$ docker run --cap-add=IPC_LOCK -e 'VAULT_LOCAL_CONFIG={"backend": {"file": {"path": "/vault/file"}}, "default_lease_ttl": "168h", "max_lease_ttl": "720h"}' vault server
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+```
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+
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+This runs a Vault server using the `file` storage backend at path `/vault/file`, with a default secret lease duration of one week and a maximum of 30 days.
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+
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+Note the `--cap-add=IPC_LOCK`: this is required in order for Vault to lock memory, which prevents it from being swapped to disk. This is highly recommended. In a non-development environment, if you do not wish to use this functionality, you must add `"disable_mlock: true"` to the configuration information.
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+
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+At startup, the server will read configuration HCL and JSON files from `/vault/config` (any information passed into `VAULT_LOCAL_CONFIG` is written into `local.json` in this directory and read as part of reading the directory for configuration files). Please see Vault's [configuration documentation](https://www.vaultproject.io/docs/config/index.html) for a full list of options.
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yosifkit
