Nomad Host Volumes
Persist stateful data across job restarts with Nomad host volumes and a MySQL database.
Lab Overview
Some Nomad workloads need to persist data that must survive when the job running them is stopped and restarted.
Nomad supports stateful workloads with three options:
- Nomad Host Volumes, managed by Nomad and usable with any task driver (Docker, Exec, Java)
- Docker Volume Drivers, externally managed and usable only with the Docker task driver
- CSI Plugins, externally managed and usable with any task driver
This lab guides you through using Nomad Host Volumes to persist data for a MySQL database. You will:
- Verify the health of a 1-server, 3-client Nomad and Consul cluster
- Configure a host volume on a single Nomad client
- Deploy a MySQL database that mounts the host volume
- Write data to the database
- Stop, purge, and re-run the job, then prove the data survived
It is based on HashiCorp's Stateful Workloads with Nomad Host Volumes tutorial.
What You'll Learn
Explain how Nomad host volumes persist data independently of a job's lifecycle
Configure a host_volume stanza on a Nomad client
Use the volume and volume_mount stanzas to attach a host volume to a task
Verify that data persists across a stop, purge, and re-run of a stateful job
Prerequisites
nomad-basics
nomad-simple-cluster
linux-command-line
Technologies Covered
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