71 lines
2.5 KiB
Markdown
71 lines
2.5 KiB
Markdown
---
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layout: "docs"
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page_title: "Drivers: Rkt"
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sidebar_current: "docs-drivers-rkt"
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description: |-
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The rkt task driver is used to run application containers using rkt.
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---
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# Rkt Driver - Experimental
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Name: `rkt`
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The `rkt` driver provides an interface for using CoreOS rkt for running
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application containers. Currently, the driver supports launching containers but
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does not support dynamic ports. This can lead to port conflicts and as such,
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this driver is being marked as experimental and should be used with care.
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## Task Configuration
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The `rkt` driver supports the following configuration in the job spec:
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* `image` - The image to run which may be specified by name, hash, ACI address
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or docker registry.
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* `command` - (Optional) A command to execute on the ACI.
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* `args` - (Optional) A list of arguments to the optional `command`.
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References to environment variables or any [intepretable Nomad
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variables](/docs/jobspec/interpreted.html) will be interpreted
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before launching the task. For example:
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```
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args = ["${nomad.datacenter}", "${MY_ENV}", ${meta.foo}"]
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```
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* `trust_prefix` - (Optional) The trust prefix to be passed to rkt. Must be
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reachable from the box running the nomad agent. If not specified, the image is
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run without verifying the image signature.
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* `dns_servers` - (Optional) A list of DNS servers to be used in the containers
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* `dns_search_domains` - (Optional) A list of DNS search domains to be used in
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the containers
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## Task Directories
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The `rkt` driver currently does not support mounting of the `alloc/` and `local/` directory.
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Once support is added, version `v0.10.0` or above of `rkt` will be required.
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## Client Requirements
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The `rkt` driver requires rkt to be installed and in your systems `$PATH`.
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The `trust_prefix` must be accessible by the node running Nomad. This can be an
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internal source, private to your cluster, but it must be reachable by the client
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over HTTP.
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## Client Attributes
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The `rkt` driver will set the following client attributes:
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* `driver.rkt` - Set to `1` if rkt is found on the host node. Nomad determines
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this by executing `rkt version` on the host and parsing the output
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* `driver.rkt.version` - Version of `rkt` eg: `0.8.1`. Note that the minimum required
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version is `0.14.0`
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* `driver.rkt.appc.version` - Version of `appc` that `rkt` is using eg: `0.8.1`
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## Resource Isolation
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This driver supports CPU and memory isolation by delegating to `rkt`. Network isolation
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is not supported as of now.
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