132 lines
4.1 KiB
Plaintext
132 lines
4.1 KiB
Plaintext
---
|
|
layout: docs
|
|
page_title: vault Stanza - Job Specification
|
|
sidebar_title: vault
|
|
description: |-
|
|
The "vault" stanza allows the task to specify that it requires a token from a
|
|
HashiCorp Vault server. Nomad will automatically retrieve a Vault token for
|
|
the task and handle token renewal for the task.
|
|
---
|
|
|
|
# `vault` Stanza
|
|
|
|
<Placement
|
|
groups={[
|
|
['job', 'vault'],
|
|
['job', 'group', 'vault'],
|
|
['job', 'group', 'task', 'vault']
|
|
]}
|
|
/>
|
|
|
|
The `vault` stanza allows a task to specify that it requires a token from a
|
|
[HashiCorp Vault][vault] server. Nomad will automatically retrieve a Vault token
|
|
for the task and handle token renewal for the task. If specified at the `group`
|
|
level, the configuration will apply to all tasks within the group. If specified
|
|
at the `job` level, the configuration will apply to all tasks within the job. If
|
|
multiple `vault` stanzas are specified, they are merged with the `task` stanza
|
|
taking the highest precedence, then the `group`, then the `job`.
|
|
|
|
```hcl
|
|
job "docs" {
|
|
group "example" {
|
|
task "server" {
|
|
vault {
|
|
policies = ["cdn", "frontend"]
|
|
|
|
change_mode = "signal"
|
|
change_signal = "SIGUSR1"
|
|
}
|
|
}
|
|
}
|
|
}
|
|
```
|
|
|
|
The Nomad client will make the Vault token available to the task by writing it
|
|
to the secret directory at `secrets/vault_token` and by injecting a `VAULT_TOKEN`
|
|
environment variable. If the Nomad cluster is [configured](/docs/configuration/vault#namespace)
|
|
to use [Vault Namespaces](https://www.vaultproject.io/docs/enterprise/namespaces),
|
|
a `VAULT_NAMESPACE` environment variable will be injected whenever `VAULT_TOKEN` is set.
|
|
|
|
If Nomad is unable to renew the Vault token (perhaps due to a Vault outage or
|
|
network error), the client will attempt to retrieve a new Vault token. If successful, the
|
|
contents of the secrets file are updated on disk, and action will be taken
|
|
according to the value set in the `change_mode` parameter.
|
|
|
|
If a `vault` stanza is specified, the [`template`][template] stanza can interact
|
|
with Vault as well.
|
|
|
|
## `vault` Parameters
|
|
|
|
- `change_mode` `(string: "restart")` - Specifies the behavior Nomad should take
|
|
if the Vault token changes. The possible values are:
|
|
|
|
- `"noop"` - take no action (continue running the task)
|
|
- `"restart"` - restart the task
|
|
- `"signal"` - send a configurable signal to the task
|
|
|
|
- `change_signal` `(string: "")` - Specifies the signal to send to the task as a
|
|
string like `"SIGUSR1"` or `"SIGINT"`. This option is required if the
|
|
`change_mode` is `signal`.
|
|
|
|
- `env` `(bool: true)` - Specifies if the `VAULT_TOKEN` and `VAULT_NAMESPACE`
|
|
environment variables should be set when starting the task.
|
|
|
|
- `namespace` `(string: "")` <EnterpriseAlert inline/> - Specifies the Vault Namespace
|
|
to use for the task. The Nomad client will retrieve a Vault token that is scoped to
|
|
this particular namespace.
|
|
|
|
- `policies` `(array<string>: [])` - Specifies the set of Vault policies that
|
|
the task requires. The Nomad client will retrieve a Vault token that is
|
|
limited to those policies.
|
|
|
|
## `vault` Examples
|
|
|
|
The following examples only show the `vault` stanzas. Remember that the
|
|
`vault` stanza is only valid in the placements listed above.
|
|
|
|
### Retrieve Token
|
|
|
|
This example tells the Nomad client to retrieve a Vault token. The token is
|
|
available to the task via the canonical environment variable `VAULT_TOKEN` and
|
|
written to disk at `secrets/vault_token`. The resulting token will have the
|
|
"frontend" Vault policy attached.
|
|
|
|
```hcl
|
|
vault {
|
|
policies = ["frontend"]
|
|
}
|
|
```
|
|
|
|
### Signal Task
|
|
|
|
This example shows signaling the task instead of restarting it.
|
|
|
|
```hcl
|
|
vault {
|
|
policies = ["frontend"]
|
|
|
|
change_mode = "signal"
|
|
change_signal = "SIGINT"
|
|
}
|
|
```
|
|
|
|
### Vault Namespace
|
|
|
|
This example shows specifying a particular Vault namespace for a given task.
|
|
|
|
<EnterpriseAlert />
|
|
|
|
```hcl
|
|
vault {
|
|
policies = ["frontend"]
|
|
namespace = "engineering/frontend"
|
|
|
|
change_mode = "signal"
|
|
change_signal = "SIGINT"
|
|
}
|
|
```
|
|
|
|
[restart]: /docs/job-specification/restart 'Nomad restart Job Specification'
|
|
[template]: /docs/job-specification/template 'Nomad template Job Specification'
|
|
[vault]: https://www.vaultproject.io/ 'Vault by HashiCorp'
|