Add new commands for creating, deleting, and listing external storage
volumes. Includes HCL decoding update for volume spec so that we can humanize
capacity bytes input values.
The HTTP test to create CSI volumes depends on having a controller plugin to
talk to, but the test was using a node-only plugin, which allows it to
silently ignore the missing controller.
In order to support new controller RPCs, we need to fingerprint volume
capabilities in more detail and perform controller RPCs only when the specific
capability is present. This fixes a bug in Ceph support where the plugin can
only suport create/delete but we assume that it also supports attach/detach.
The CSI specification requires that we validate a list of `Capability` (access
mode + accessibility) when we create volume, but the existing volume
registration workflow incorrectly validates a single capability. The
specific capability required by a volume claim is checked at the time we make
the claim, so remove the check for `AttachmentMode`/`AcccessMode`.
This commit includes a new test client that allows overriding the RPC
protocols. Only the RPCs that are passed in are registered, which lets you
implement a mock RPC in the server tests. This commit includes an example of
this for the ClientCSI RPC server.
Note that unset proto fields for volume create should be nil. The CSI spec
handles empty fields and nil fields in the protobuf differently, which may
result in validation failures for creating volumes with no prior source (and
does in testing with the AWS EBS plugin). Refactor the `CreateVolumeRequest`
mapping to the protobuf in the plugin client to avoid this bug.
The test assertion that we don't have a delete future remaining races with the
code its testing, because the removal of the image and the removal of the
future are not atomic. Move this assertion into a `WaitForResult` to avoid
test flakes which we're seeing on CI on Windows in particular.
Use the MemoryMaxMB as the LinuxResources limit. This is intended to ease
drivers implementation and adoption of the features: drivers that use
`resources.LinuxResources.MemoryLimitBytes` don't need to be updated.
Drivers that use NomadResources will need to updated to track the new
field value. Given that tasks aren't guaranteed to use up the excess
memory limit, this is a reasonable compromise.
This commit updates the API to pass the MemoryMaxMB field, and the CLI to show
the max set for the task.
Also, start parsing the MemoryMaxMB in hcl2, as it's set by tags.
A sample CLI output; note the additional `Max: ` for "task":
```
$ nomad alloc status 96fbeb0b
ID = 96fbeb0b-a0b3-aa95-62bf-b8a39492fd5c
[...]
Task "cgroup-fetcher" is "running"
Task Resources
CPU Memory Disk Addresses
0/500 MHz 32 MiB/20 MiB 300 MiB
Task Events:
[...]
Task "task" is "running"
Task Resources
CPU Memory Disk Addresses
0/500 MHz 176 KiB/20 MiB 300 MiB
Max: 30 MiB
Task Events:
[...]
```
Start tracking a new MemoryMaxMB field that represents the maximum memory a task
may use in the client. This allows tasks to specify a memory reservation (to be
used by scheduler when placing the task) but use excess memory used on the
client if the client has any.
This commit adds the server tracking for the value, and ensures that allocations
AllocatedResource fields include the value.
Mahmood Ali