Nomad servers need to make requests to CSI controller plugins running
on a client for publish/unpublish. The RPC needs to look up the client
node based on the plugin, load balancing across controllers, and then
perform the required client RPC to that node (via server forwarding if
neccessary).
This commit refactors the ACL code for the CSI endpoint to support
environments that run without acls enabled (e.g developer environments)
and also provides an easy way to restrict which endpoints may be
accessed with a client's SecretID to limit the blast radius of a
malicious client on the state of the environment.
The `ControllerPublishVolumeResponse` CSI RPC includes the publish
context intended to be passed by the orchestrator as an opaque value
to the node plugins. This changeset adds it to our response to a
volume claim request to proxy the controller's response back to the
client node.
When an alloc is marked terminal, and after node unstage/unpublish
have been called, the client will sync the terminal alloc state with
the server via `Node.UpdateAlloc` RPC.
This changeset implements releasing the volume claim for each volume
associated with the terminal alloc. It doesn't yet implement the RPC
call we need to make to the `ControllerUnpublishVolume` CSI RPC.
When the client receives an allocation which includes a CSI volume,
the alloc runner will block its main `Run` loop. The alloc runner will
issue a `VolumeClaim` RPC to the Nomad servers. This changeset
implements the portions of the `VolumeClaim` RPC endpoint that have
not been previously completed.
* state_store: csi volumes/plugins store the index in the txn
* nomad: csi_endpoint_test require index checks need uint64()
* nomad: other tests using int 0 not uint64(0)
* structs: pass index into New, but not other struct methods
* state_store: csi plugin indexes, use new struct interface
* nomad: csi_endpoint_test check index/query meta (on explicit 0)
* structs: NewCSIVolume takes an index arg now
* scheduler/test: NewCSIVolume takes an index arg now
This changeset adds a new core job `CoreJobCSIVolumePublicationGC` to
the leader's loop for scheduling core job evals. Right now this is an
empty method body without even a config file stanza. Later changesets
will implement the logic of volume publication GC.
state_store: change claim counts
state_store: get volumes by all, by driver
state_store: process volume claims
state_store: csi volume register error on update
This changeset implements the initial registration and fingerprinting
of CSI Plugins as part of #5378. At a high level, it introduces the
following:
* A `csi_plugin` stanza as part of a Nomad task configuration, to
allow a task to expose that it is a plugin.
* A new task runner hook: `csi_plugin_supervisor`. This hook does two
things. When the `csi_plugin` stanza is detected, it will
automatically configure the plugin task to receive bidirectional
mounts to the CSI intermediary directory. At runtime, it will then
perform an initial heartbeat of the plugin and handle submitting it to
the new `dynamicplugins.Registry` for further use by the client, and
then run a lightweight heartbeat loop that will emit task events
when health changes.
* The `dynamicplugins.Registry` for handling plugins that run
as Nomad tasks, in contrast to the existing catalog that requires
`go-plugin` type plugins and to know the plugin configuration in
advance.
* The `csimanager` which fingerprints CSI plugins, in a similar way to
`drivermanager` and `devicemanager`. It currently only fingerprints
the NodeID from the plugin, and assumes that all plugins are
monolithic.
Missing features
* We do not use the live updates of the `dynamicplugin` registry in
the `csimanager` yet.
* We do not deregister the plugins from the client when they shutdown
yet, they just become indefinitely marked as unhealthy. This is
deliberate until we figure out how we should manage deploying new
versions of plugins/transitioning them.
The test starts enough connections to hit the limit, then closes the
connection and immediately starts one expecting the new one to succeed.
We must wait until the server side recognizes the connection
closing and free up a limits slot. The current test attempts to achieve
that by waiting to get an error on conn.Read, however, this error is
returned from local client without waiting for server update.
As such, I change the logic so it retries on connection rejection but
force the first non-EOF failure to be a deadline error.
This fixes a bug where a forwarded node update request may be assumed
to be the actual direct client connection if the server just lost
leadership.
When a nomad non-leader server receives a Node.UpdateStatus request, it
forwards the RPC request to the leader, and holds on the request
Yamux connection in a cache to allow for server<->client forwarding.
When the leader handles the request, it must differentiate between a
forwarded connection vs the actual connection. This is done in
https://github.com/hashicorp/nomad/blob/v0.10.4/nomad/node_endpoint.go#L412
Now, consider if the non-leader server forwards to the connection to a
recently deposed nomad leader, which in turn forwards the RPC request to
the new leader.
Without this change, the deposed leader will mistake the forwarded
connection for the actual client connection and cache it mapped to the
client ID. If the server attempts to connect to that client, it will
attempt to start a connection/session to the other server instead and
the call will hang forever.
This change ensures that we only add node connection mapping if the
request is not a forwarded request, regardless of circumstances.
This deflake the tests in the deploymentwatcher package. The package
uses a mock deployment watcher backend, where the watcher in a
background goroutine calls UpdateDeploymentStatus . If the mock isn't
configured to expect the call, the background goroutine will fail. One
UpdateDeploymentStatus call is made at the end of the background
goroutine, which may occur after the test completes, thus explaining the
flakiness.
