plugins/driver: update driver interface to support streaming stats
client/tr: use streaming stats api
TODO:
* how to handle errors and closed channel during stats streaming
* prevent tight loop if Stats(ctx) returns an error
drivers: update drivers TaskStats RPC to handle streaming results
executor: better error handling in stats rpc
docker: better control and error handling of stats rpc
driver: allow stats to return a recoverable error
Re-export the ResourceUsage structs in drivers package to avoid drivers
directly depending on the internal client/structs package directly.
I attempted moving the structs to drivers, but that caused some import
cycles that was a bit hard to disentagle. Alternatively, I added an
alias here that's sufficient for our purposes of avoiding external
drivers depend on internal packages, while allowing us to restructure
packages in future without breaking source compatibility.
We ultimately decided to provide a limited set of devices in exec/java
drivers instead of all of host ones. Pre-0.9, we made all host devices
available to exec tasks accidentally, yet most applications only use a
small subset, and this choice limits our ability to restrict/isolate GPU
and other devices.
Starting with 0.9, by default, we only provide the same subset of
devices Docker provides, and allow users to provide more devices as
needed on case-by-case basis.
This reverts commit 5805c64a9f1c3b409693493dfa30e7136b9f547b.
This reverts commit ff9a4a17e59388dcab067949e0664f645b2f5bcf.
Use a dedicated /dev mount so we can inject more devices if necessary,
and avoid allowing a container to contaminate host /dev.
Follow up to https://github.com/hashicorp/nomad/pull/5143 - and fixes master.
Restores pre-0.9 behavior, where Nomad makes /dev available to exec
task. Switching to libcontainer, we accidentally made only a small
subset available.
Here, we err on the side of preserving behavior of 0.8, instead of going
for the sensible route, where only a reasonable subset of devices is
mounted by default and user can opt to request more.
* master: (71 commits)
Fix output of 'nomad deployment fail' with no arg
Always create a running allocation when testing task state
tests: ensure exec tests pass valid task resources (#4992)
some changes for more idiomatic code
fix iops related tests
fixed bug in loop delay
gofmt
improved code for readability
client: updateAlloc release lock after read
fixup! device attributes in `nomad node status -verbose`
drivers/exec: support device binds and mounts
fix iops bug and increase test matrix coverage
tests: tag image explicitly
changelog
ci: install lxc-templates explicitly
tests: skip checking rdma cgroup
ci: use Ubuntu 16.04 (Xenial) in TravisCI
client: update driver info on new fingerprint
drivers/docker: enforce volumes.enabled (#4983)
client: Style: use fluent style for building loggers
...
Noticed few places where tests seem to block indefinitely and panic
after the test run reaches the test package timeout.
I intend to follow up with the proper fix later, but timing out is much
better than indefinitely blocking.
Using statically linked busybox binary to setup a basic rootfs for
testing, by symlinking it to provide the basic commands used in tests.
I considered using a proper rootfs tarball, but the overhead of managing
tarfile and expanding it seems significant enough that I went with this
implementation.
IOPS have been modelled as a resource since Nomad 0.1 but has never
actually been detected and there is no plan in the short term to add
detection. This is because IOPS is a bit simplistic of a unit to define
the performance requirements from the underlying storage system. In its
current state it adds unnecessary confusion and can be removed without
impacting any users. This PR leaves IOPS defined at the jobspec parsing
level and in the api/ resources since these are the two public uses of
the field. These should be considered deprecated and only exist to allow
users to stop using them during the Nomad 0.9.x release. In the future,
there should be no expectation that the field will exist.
Currently, libcontainer-based executor, upon shutdown, kills the
container initial process. The children of the killed process remain
running, and the executor is never marked as terminated until they do.
Also, fix a case where we treat processes as successful, when
`proc.Wait()` fails. In some attempts, I was getting "waitid no child
processes" errors and such error shouldn't get process to be considered
successful.
As part of deprecating legacy drivers, we're moving the env package to a
new drivers/shared tree, as it is used by the modern docker and rkt
driver packages, and is useful for 3rd party plugins.
Tests expect that as soon as eventer shuts down immediately on context
cancellations; but golang does not guarantee priority when multiple
pending channels are ready in a select statement.
Nick Ethier