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open-nomad/demo/csi/hostpath/README.md

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Hostpath CSI Plugin

Author: @hashicorp/nomad-eng

This directory includes a demo using the CSI host path driver to create local "host path" volumes that can be mounted via the Nomad CSI implementation.

What Is This For?

The hostpath plugin is for demonstration and development purposes only. It shouldn't be used for production. If you want to get a quick idea of how CSI works on Nomad in a Vagrant environment, this demo is a good option.

Requirements

  • A running Nomad cluster with docker.privileged.enabled = true. The Nomad developer Vagrantfile in this repo is suitable.

Running the run.sh script in this directory will output the Nomad command used to run the demo, as well as their outputs:

$ nomad job run ./plugin.nomad
==> Monitoring evaluation "7ac3cc8d"
    Evaluation triggered by job "csi-plugin"
    Allocation "bbd34b72" created: node "917b009b", group "csi"
==> Monitoring evaluation "7ac3cc8d"
    Allocation "bbd34b72" status changed: "pending" -> "running" (Tasks are running)
    Evaluation status changed: "pending" -> "complete"
==> Evaluation "7ac3cc8d" finished with status "complete"
Nodes Healthy        = 1

$ nomad plugin status hostpath
ID                   = hostpath-plugin0
Provider             = csi-hostpath
Version              = v1.2.0-0-g83590990
Controllers Healthy  = 1
Controllers Expected = 1
Nodes Healthy        = 1
Nodes Expected       = 1

Allocations
ID        Node ID   Task Group  Version  Desired  Status   Created  Modified
bbd34b72  917b009b  csi         0        run      running  3s ago   2s ago

$ cat hostpath.hcl | sed | nomad volume create -
Created external volume 7185cd16-993f-11eb-a052-0242ac110002 with ID test-volume[0]

$ cat hostpath.hcl | sed | nomad volume create -
Created external volume 718bd6b4-993f-11eb-a052-0242ac110002 with ID test-volume[1]

$ nomad job run ./redis.nomad
==> Monitoring evaluation "3178513e"
    Evaluation triggered by job "example"
    Evaluation within deployment: "ffb161f4"
    Allocation "139caa78" created: node "917b009b", group "cache"
    Allocation "5e1b57f5" created: node "917b009b", group "cache"
    Evaluation status changed: "pending" -> "complete"
==> Evaluation "3178513e" finished with status "complete"

$ nomad volume status
Container Storage Interface
ID              Name            Plugin ID         Schedulable  Access Mode
test-volume[0]  test-volume[0]  hostpath-plugin0  true         single-node-reader-only
test-volume[1]  test-volume[1]  hostpath-plugin0  true         single-node-reader-only