Initial addition of Vault docs

vault/README-short.txt

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+Vault is a tool for securely accessing secrets via a unified interface and tight access control.

vault/content.md

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+# Vault
+
+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:
+
+  * [Vault documentation](https://www.vaultproject.io/)
+  * [Vault on GitHub](https://github.com/hashicorp/vault)
+
+%%LOGO%%
+
+# Using the Container
+
+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.
+
+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.
+
+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
+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`.
+
+The container exposes two optional `VOLUME`s:
+
+  * `/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.
+  * `/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.
+
+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.
+
+## Running Vault for Development
+
+```console
+$ docker run -d --name=dev-vault vault
+```
+
+This runs a completely in-memory Vault server, which is useful for development
+but should not be used in production.
+
+When running in development mode, two additional options can be set via
+environment variables:
+
+  * `VAULT_DEV_ROOT_TOKEN_ID`: This sets the ID of the initial generated root
+    token to the given value
+  * `VAULT_DEV_LISTEN_ADDRESS`: This sets the IP:port of the development server
+    listener
+
+As an example:
+
+```console
+$ docker run -e 'VAULT_DEV_ROOT_TOKEN_ID=myroot' -e 'VAULT_DEV_LISTEN_ADDRESS=127.0.0.1:1234' vault
+```
+
+## Running Vault in Server Mode
+
+```console
+$ 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
+```
+
+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.
+
+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.
+
+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.

vault/github-repo

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+https://github.com/hashicorp/docker-vault

vault/license.md

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+View [license information](https://raw.githubusercontent.com/hashicorp/vault/master/LICENSE) for the software contained in this image.