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Seth Hoenig 14a022cbc0 drivers/raw_exec: enable setting cgroup override values (#20481 )

* drivers/raw_exec: enable setting cgroup override values

This PR enables configuration of cgroup override values on the `raw_exec`
task driver. WARNING: setting cgroup override values eliminates any
gauruntee Nomad can make about resource availability for *any* task on
the client node.

For cgroup v2 systems, set a single unified cgroup path using `cgroup_v2_override`.
The path may be either absolute or relative to the cgroup root.

config {
  cgroup_v2_override = "custom.slice/app.scope"
}

or

config {
  cgroup_v2_override = "/sys/fs/cgroup/custom.slice/app.scope"
}

For cgroup v1 systems, set a per-controller path for each controller using
`cgroup_v1_override`. The path(s) may be either absolute or relative to
the controller root.

config {
  cgroup_v1_override = {
    "pids": "custom/app",
    "cpuset": "custom/app",
  }
}

or

config {
  cgroup_v1_override = {
    "pids": "/sys/fs/cgroup/pids/custom/app",
    "cpuset": "/sys/fs/cgroup/cpuset/custom/app",
  }
}

* drivers/rawexec: ensure only one of v1/v2 cgroup override is set

* drivers/raw_exec: executor should error if setting cgroup does not work

* drivers/raw_exec: create cgroups in raw_exec tests

* drivers/raw_exec: ensure we fail to start if custom cgroup set and non-root

* move custom cgroup func into shared file

---------

Co-authored-by: Michael Schurter <mschurter@hashicorp.com>

2024-05-07 16:46:27 -07:00

capabilities

remove repetitive words (#20110 )

2024-03-11 08:52:08 +00:00

eventer

test: fix test datarace within driver shared eventer. (#19975 )

2024-02-15 07:39:43 +00:00

executor

drivers/raw_exec: enable setting cgroup override values (#20481 )

2024-05-07 16:46:27 -07:00

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