Storage Plugins

Nomad has built-in support for scheduling compute resources such as CPU, memory, and networking. Nomad's storage plugin support extends this to allow scheduling tasks with dynamically managed storage volumes.

Choose between two types of storage plugins:

• Dynamic host volume (DHV) plugins provision host volumes on client nodes, and jobs request placement on any node that has a particular host volume by name.
  • DHV brings allocations to volumes.
  • Install DHV plugins on Nomad nodes, similar to task drivers. Creating a host volume ties it to the node until the volume is deleted.
• Container Storage Interface (CSI) plugins provision volumes in third-party systems, such as cloud vendors. Nomad calls on them to make the volume available on any node that Nomad chooses to place an allocation.
  • CSI brings volumes to allocations.
  • Deploy CSI plugins as Nomad jobs, often two jobs per plugin. Nomad tracks which clients have instances of a given plugin, so it can call on the plugin to mount the volume.