Nomad hello-world example for custom driver fails with "rpc error: code = Unknown desc = unable to configure cgroups: no such file or directory"

[Powerinno]

Nomad version

1.10.0

Operating system and Environment

Ubuntu 24.04.2 LTS,, x64

Issue

Nomad hello example custom driver fails with "rpc error: code = Unknown desc = Failed at executor: rpc error: code = Unknown desc = unable to configure cgroups: no such file or directory"

output of cat /sys/fs/cgroup/cgroup.controllers is:
cpuset cpu io memory hugetlb pids rdma misc

and logs from the job allocation are:
{"@Level":"debug","@message":"plugin address","@timestamp":"2025-06-30T19:58:07.983149+03:00","address":"/tmp/plugin2966876518","network":"unix"}
{"@Level":"error","@message":"failed to configure container, process isolation will not work","@module":"executor","@timestamp":"2025-06-30T19:58:07.986883+03:00","error":"no such file or directory"}

Reproduction steps

Compile the plugin from: https://github.com/hashicorp/nomad-skeleton-driver-plugin

Expected Result

The job should run successfully and display "Hello, World!"

Actual Result

It gives the following error: "rpc error: code = Unknown desc = Failed at executor: rpc error: code = Unknown desc = unable to configure cgroups: no such file or directory"

Job file (if appropriate)

job "example" {
  datacenters = ["dc1"]
  type        = "batch"

  group "example" {
    task "hello-world" {
      driver = "hello-driver"
      config {
        greeting = "hello"
      }
    }
  }
}

[jrasell]

Hi @Powerinno and thanks for raising this issue. I suspect the plugin readme is missing a nuance whereby on Linux the Nomad client is expected to run under root. When starting the Nomad agent, could you try sudo nomad agent -dev -config=./example/agent.hcl -plugin-dir=$(pwd)?

[Powerinno]

Hi @jrasell, thank you for your response. Yes, I ran the client as sudo using the following command:
sudo nomad agent -config=./client.hcl -plugin-dir="/opt/nomad/plugins"
Please let me know if I can provide any additional information. Thank you!

I’ve also checked to ensure that the required cgroups [1] are available on my machine. They are present, as the output from the command listed in the documentation confirms:
cpuset cpu io memory hugetlb pids rdma misc

[1] https://developer.hashicorp.com/nomad/docs/install/production/requirements