Fix a bug where a millicious user can access or manipulate an alloc in a
namespace they don't have access to. The allocation endpoints perform
ACL checks against the request namespace, not the allocation namespace,
and performs the allocation lookup independently from namespaces.
Here, we check that the requested can access the alloc namespace
regardless of the declared request namespace.
Ideally, we'd enforce that the declared request namespace matches
the actual allocation namespace. Unfortunately, we haven't documented
alloc endpoints as namespaced functions; we suspect starting to enforce
this will be very disruptive and inappropriate for a nomad point
release. As such, we maintain current behavior that doesn't require
passing the proper namespace in request. A future major release may
start enforcing checking declared namespace.
fixes https://github.com/hashicorp/nomad/issues/6382
The prestart hook for templates blocks while it resolves vault secrets.
If the secret is not found it continues to retry. If a task is shutdown
during this time, the prestart hook currently does not receive
shutdownCtxCancel, causing it to hang.
This PR joins the two contexts so either killCtx or shutdownCtx cancel
and stop the task.
In a job registration request, ensure that the request namespace "header" and job
namespace field match. This should be the case already in prod, as http
handlers ensures that the values match [1].
This mitigates bugs that exploit bugs where we may check a value but act
on another, resulting into bypassing ACL system.
[1] https://github.com/hashicorp/nomad/blob/v0.9.5/command/agent/job_endpoint.go#L415-L418
Currently, there is an issue when running on Windows whereby under some
circumstances the Windows stats API's will begin to return errors (such
as internal timeouts) when a client is under high load, and potentially
other forms of resource contention / system states (and other unknown
cases).
When an error occurs during this collection, we then short circuit
further metrics emission from the client until the next interval.
This can be problematic if it happens for a sustained number of
intervals, as our metrics aggregator will begin to age out older
metrics, and we will eventually stop emitting various types of metrics
including `nomad.client.unallocated.*` metrics.
However, when metrics collection fails on Linux, gopsutil will in many cases
(e.g cpu.Times) silently return 0 values, rather than an error.
Here, we switch to returning empty metrics in these failures, and
logging the error at the source. This brings the behaviour into line
with Linux/Unix platforms, and although making aggregation a little
sadder on intermittent failures, will result in more desireable overall
behaviour of keeping metrics available for further investigation if
things look unusual.
Some drivers will automatically create directories when trying to mount
a path into a container, but some will not.
To unify this behaviour, this commit requires that host volumes already exist,
and can be stat'd by the Nomad Agent during client startup.
Currently, using a Volume in a job uses the following configuration:
```
volume "alias-name" {
type = "volume-type"
read_only = true
config {
source = "host_volume_name"
}
}
```
This commit migrates to the following:
```
volume "alias-name" {
type = "volume-type"
source = "host_volume_name"
read_only = true
}
```
The original design was based due to being uncertain about the future of storage
plugins, and to allow maxium flexibility.
However, this causes a few issues, namely:
- We frequently need to parse this configuration during submission,
scheduling, and mounting
- It complicates the configuration from and end users perspective
- It complicates the ability to do validation
As we understand the problem space of CSI a little more, it has become
clear that we won't need the `source` to be in config, as it will be
used in the majority of cases:
- Host Volumes: Always need a source
- Preallocated CSI Volumes: Always needs a source from a volume or claim name
- Dynamic Persistent CSI Volumes*: Always needs a source to attach the volumes
to for managing upgrades and to avoid dangling.
- Dynamic Ephemeral CSI Volumes*: Less thought out, but `source` will probably point
to the plugin name, and a `config` block will
allow you to pass meta to the plugin. Or will
point to a pre-configured ephemeral config.
*If implemented
The new design simplifies this by merging the source into the volume
stanza to solve the above issues with usability, performance, and error
handling.
On macOS, `os.TempDir` returns a symlinked path under `/var` which is
outside of the directories shared into the VM used for Docker, and
that fails tests using Docker that need that mount. If we expand the
symlink to get the real path in `/private`, we're in the shared
folders and can safely mount them.
This is an attempt to ease dependency management for external driver
plugins, by avoiding requiring them to compile ugorji/go generated
files. Plugin developers reported some pain with the brittleness of
ugorji/go dependency in particular, specially when using go mod, the
default go mod manager in golang 1.13.
Context
--------
Nomad uses msgpack to persist and serialize internal structs, using
ugorji/go library. As an optimization, we use ugorji/go code generation
to speedup process and aovid the relection-based slow path.
We commit these generated files in repository when we cut and tag the
release to ease reproducability and debugging old releases. Thus,
downstream projects that depend on release tag, indirectly depends on
ugorji/go generated code.
Sadly, the generated code is brittle and specific to the version of
ugorji/go being used. When go mod picks another version of ugorji/go
then nomad (go mod by default uses release according to semver),
downstream projects face compilation errors.
Interestingly, downstream projects don't commonly serialize nomad
internal structs. Drivers and device plugins use grpc instead of
msgpack for the most part. In the few cases where they use msgpag (e.g.
decoding task config), they do without codegen path as they run on
driver specific structs not the nomad internal structs. Also, the
ugorji/go serialization through reflection is generally backward
compatible (mod some ugorji/go regression bugs that get introduced every
now and then :( ).
Proposal
---------
The proposal here is to keep committing ugorji/go codec generated files
for releases but to use a go tag for them.
All nomad development through the makefile, including releasing, CI and
dev flow, has the tag enabled.
Downstream plugin projects, by default, will skip these files and life
proceed as normal for them.
The downside is that nomad developers who use generated code but avoid
using make must start passing additional go tag argument. Though this
is not a blessed configuration.
Splitting the immutable and mutable components of the scriptCheck led
to a bug where the environment interpolation wasn't being incorporated
into the check's ID, which caused the UpdateTTL to update for a check
ID that Consul didn't have (because our Consul client creates the ID
from the structs.ServiceCheck each time we update).
Task group services don't have access to a task environment at
creation, so their checks get registered before the check can be
interpolated. Use the original check ID so they can be updated.
* ar: refactor network bridge config to use go-cni lib
* ar: use eth as the iface prefix for bridged network namespaces
* vendor: update containerd/go-cni package
* ar: update network hook to use TODO contexts when calling configurator
* unnecessary conversion
In Nomad prior to Consul Connect, all Consul checks work the same
except for Script checks. Because the Task being checked is running in
its own container namespaces, the check is executed by Nomad in the
Task's context. If the Script check passes, Nomad uses the TTL check
feature of Consul to update the check status. This means in order to
run a Script check, we need to know what Task to execute it in.
To support Consul Connect, we need Group Services, and these need to
be registered in Consul along with their checks. We could push the
Service down into the Task, but this doesn't work if someone wants to
associate a service with a task's ports, but do script checks in
another task in the allocation.
Because Nomad is handling the Script check and not Consul anyways,
this moves the script check handling into the task runner so that the
task runner can own the script check's configuration and
lifecycle. This will allow us to pass the group service check
configuration down into a task without associating the service itself
with the task.
When tasks are checked for script checks, we walk back through their
task group to see if there are script checks associated with the
task. If so, we'll spin off script check tasklets for them. The
group-level service and any restart behaviors it needs are entirely
encapsulated within the group service hook.
* connect: add unix socket to proxy grpc for envoy
Fixes#6124
Implement a L4 proxy from a unix socket inside a network namespace to
Consul's gRPC endpoint on the host. This allows Envoy to connect to
Consul's xDS configuration API.
* connect: pointer receiver on structs with mutexes
* connect: warn on all proxy errors
The ClientState being pending isn't a good criteria; as an alloc may
have been updated in-place before it was completed.
Also, updated the logic so we only check for task states. If an alloc
has deployment state but no persisted tasks at all, restore will still
fail.
* taskenv: add connect upstream env vars + test
* set taskenv upstreams instead of appending
* Update client/taskenv/env.go
Co-Authored-By: Michael Schurter <mschurter@hashicorp.com>
This uses an alternative approach where we avoid restoring the alloc
runner in the first place, if we suspect that the alloc may have been
completed already.
This commit aims to help users running with clients suseptible to the
destroyed alloc being restrarted bug upgrade to latest. Without this,
such users will have their tasks run unexpectedly on upgrade and only
see the bug resolved after subsequent restart.
If, on restore, the client sees a pending alloc without any other
persisted info, then err on the side that it's an corrupt persisted
state of an alloc instead of the client happening to be killed right
when alloc is assigned to client.
Few reasons motivate this behavior:
Statistically speaking, corruption being the cause is more likely. A
long running client will have higher chance of having allocs persisted
incorrectly with pending state. Being killed right when an alloc is
about to start is relatively unlikely.
Also, delaying starting an alloc that hasn't started (by hopefully
seconds) is not as severe as launching too many allocs that may bring
client down.
More importantly, this helps customers upgrade their clients without
risking taking their clients down and destablizing their cluster. We
don't want existing users to force triggering the bug while they upgrade
and restart cluster.
Protect against a race where destroying and persist state goroutines
race.
The downside is that the database io operation will run while holding
the lock and may run indefinitely. The risk of lock being long held is
slow destruction, but slow io has bigger problems.
This fixes a bug where allocs that have been GCed get re-run again after client
is restarted. A heavily-used client may launch thousands of allocs on startup
and get killed.
The bug is that an alloc runner that gets destroyed due to GC remains in
client alloc runner set. Periodically, they get persisted until alloc is
gced by server. During that time, the client db will contain the alloc
but not its individual tasks status nor completed state. On client restart,
client assumes that alloc is pending state and re-runs it.
Here, we fix it by ensuring that destroyed alloc runners don't persist any alloc
to the state DB.
This is a short-term fix, as we should consider revamping client state
management. Storing alloc and task information in non-transaction non-atomic
concurrently while alloc runner is running and potentially changing state is a
recipe for bugs.
Fixes https://github.com/hashicorp/nomad/issues/5984
Related to https://github.com/hashicorp/nomad/pull/5890
Fixes a bug where we cpu is pigged at 100% due to collecting devices
statistics. The passed stats interval was ignored, and the default zero
value causes a very tight loop of stats collection.
FWIW, in my testing, it took 2.5-3ms to collect nvidia GPU stats, on a
`g2.2xlarge` ec2 instance.
The stats interval defaults to 1 second and is user configurable. I
believe this is too frequent as a default, and I may advocate for
reducing it to a value closer to 5s or 10s, but keeping it as is for
now.
Fixes https://github.com/hashicorp/nomad/issues/6057 .
* adds meta object to service in job spec, sends it to consul
* adds tests for service meta
* fix tests
* adds docs
* better hashing for service meta, use helper for copying meta when registering service
* tried to be DRY, but looks like it would be more work to use the
helper function
Fixes#6041
Unlike all other Consul operations, boostrapping requires Consul be
available. This PR tries Consul 3 times with a backoff to account for
the group services being asynchronously registered with Consul.
* nomad: add admission controller framework
* nomad: add admission controller framework and Consul Connect hooks
* run admission controllers before checking permissions
* client: add default node meta for connect configurables
* nomad: remove validateJob func since it has been moved to admission controller
* nomad: use new TaskKind type
* client: use consts for connect sidecar image and log level
* Apply suggestions from code review
Co-Authored-By: Michael Schurter <mschurter@hashicorp.com>
* nomad: add job register test with connect sidecar
* Update nomad/job_endpoint_hooks.go
Co-Authored-By: Michael Schurter <mschurter@hashicorp.com>
When rendering a task template, the `plugin` function is no longer
permitted by default and will raise an error. An operator can opt-in
to permitting this function with the new `template.function_blacklist`
field in the client configuration.
When rendering a task template, path parameters for the `file`
function will be treated as relative to the task directory by
default. Relative paths or symlinks that point outside the task
directory will raise an error. An operator can opt-out of this
protection with the new `template.disable_file_sandbox` field in the
client configuration.
When rendering a task consul template, ensure that only task environment
variables are used.
Currently, `consul-template` always falls back to host process
environment variables when key isn't a task env var[1]. Thus, we add
an empty entry for each host process env-var not found in task env-vars.
[1] bfa5d0e133/template/funcs.go (L61-L75)
Adds a new Prerun and Postrun hooks to manage set up of network namespaces
on linux. Work still needs to be done to make the code platform agnostic and
support Docker style network initalization.
There's a bug in go1.11 that causes some io operations on windows to
return incorrect errors for some cases when Stat-ing files. To avoid
upgrading to go1.12 in a point release, here we loosen up the cases
where we will attempt to create fifos, and add some logging of
underlying stat errors to help with debugging.
Previously, if a channel is closed, we retry the Stats call. But, if that call
fails, we go in a backoff loop without calling Stats ever again.
Here, we use a utility function for calling driverHandle.Stats call that retries
as one expects.
I aimed to preserve the logging formats but made small improvements as I saw fit.
When an alloc runner prestart hook fails, the task runners aren't invoked
and they remain in a pending state.
This leads to terrible results, some of which are:
* Lockup in GC process as reported in https://github.com/hashicorp/nomad/pull/5861
* Lockup in shutdown process as TR.Shutdown() waits for WaitCh to be closed
* Alloc not being restarted/rescheduled to another node (as it's still in
pending state)
* Unexpected restart of alloc on a client restart, potentially days/weeks after
alloc expected start time!
Here, we treat all tasks to have failed if alloc runner prestart hook fails.
This fixes the lockups, and permits the alloc to be rescheduled on another node.
While it's desirable to retry alloc runner in such failures, I opted to treat it
out of scope. I'm afraid of some subtles about alloc and task runners and their
idempotency that's better handled in a follow up PR.
This might be one of the root causes for
https://github.com/hashicorp/nomad/issues/5840 .
When fetching node alloc assignments, be defensive against a stale read before
killing local nodes allocs.
The bug is when both client and servers are restarting and the client requests
the node allocation for the node, it might get stale data as server hasn't
finished applying all the restored raft transaction to store.
Consequently, client would kill and destroy the alloc locally, just to fetch it
again moments later when server store is up to date.
The bug can be reproduced quite reliably with single node setup (configured with
persistence). I suspect it's too edge-casey to occur in production cluster with
multiple servers, but we may need to examine leader failover scenarios more closely.
In this commit, we only remove and destroy allocs if the removal index is more
recent than the alloc index. This seems like a cheap resiliency fix we already
use for detecting alloc updates.
A more proper fix would be to ensure that a nomad server only serves
RPC calls when state store is fully restored or up to date in leadership
transition cases.
Although this operation is safe on linux, it is not safe on Windows when
using the named pipe interface. To provide a ~reasonable common api
abstraction, here we switch to returning File exists errors on the unix
api.
On unix platforms, it is safe to re-open fifo's for reading after the
first creation if the file is already a fifo, however this is not
possible on windows where this triggers a permissions error on the
socket path, as you cannot recreate it.
We can't transparently handle this in the CreateAndRead handle, because
the Access Is Denied error is too generic to reliably be an IO error.
Instead, we add an explict API for opening a reader to an existing FIFO,
and check to see if the fifo already exists inside the calling package
(e.g logmon)
This change fixes a bug where nomad would avoid running alloc tasks if
the alloc is client terminal but the server copy on the client isn't
marked as running.
Here, we fix the case by having task runner uses the
allocRunner.shouldRun() instead of only checking the server updated
alloc.
Here, we preserve much of the invariants such that `tr.Run()` is always
run, and don't change the overall alloc runner and task runner
lifecycles.
Fixes https://github.com/hashicorp/nomad/issues/5883
Currently, if killTask results in the termination of a process before
calling WaitTask, Restart() will incorrectly return a TaskNotFound
error when using the raw_exec driver on Windows.
Currently, nomad "plugin" processes (e.g. executor, logmon, docker_logger) are started as CLI
commands to be handled by command CLI framework. Plugin launchers use
`discover.NomadBinary()` to identify the binary and start it.
This has few downsides: The trivial one is that when running tests, one
must re-compile the nomad binary as the tests need to invoke the nomad
executable to start plugin. This is frequently overlooked, resulting in
puzzlement.
The more significant issue with `executor` in particular is in relation
to external driver:
* Plugin must identify the path of invoking nomad binary, which is not
trivial; `discvoer.NomadBinary()` now returns the path to the plugin
rather than to nomad, preventing external drivers from launching
executors.
* The external driver may get a different version of executor than it
expects (specially if we make a binary incompatible change in future).
This commit addresses both downside by having the plugin invocation
handling through an `init()` call, similar to how libcontainer init
handler is done in [1] and recommened by libcontainer [2]. `init()`
will be invoked and handled properly in tests and external drivers.
For external drivers, this change will cause external drivers to launch
the executor that's compiled against.
There a are a couple of downsides to this approach:
* These specific packages (i.e executor, logmon, and dockerlog) need to
be careful in use of `init()`, package initializers. Must avoid having
command execution rely on any other init in the package. I prefixed
files with `z_` (golang processes files in lexical order), but ensured
we don't depend on order.
* The command handling is spread in multiple packages making it a bit
less obvious how plugin starts are handled.
[1] drivers/shared/executor/libcontainer_nsenter_linux.go
[2] eb4aeed24f/libcontainer (using-libcontainer)
- updated region in job metadata that gets persisted to nomad datastore
- fixed many unrelated unit tests that used an invalid region value
(they previously passed because hcl wasn't getting picked up and
the job would default to global region)
We currently only run cleanup Service Hooks when a task is either
Killed, or Exited. However, due to the implementation of a task runner,
tasks are only Exited if they every correctly started running, which is
not true when you recieve an error early in the task start flow, such as
not being able to pull secrets from Vault.
This updates the service hook to also call consul deregistration
routines during a task Stop lifecycle event, to ensure that any
registered checks and services are cleared in such cases.
fixes#5770
When a client is running against an old server (e.g. running 0.8),
`alloc.AllocatedResources` may be nil, and we need to check the
deprecated `alloc.TaskResources` instead.
Fixes https://github.com/hashicorp/nomad/issues/5810
Alloc runner already tracks tasks associated with alloc. Here, we
become defensive by relying on the alloc runner tracked tasks, rather
than depend on server never updating the job unexpectedly.
This exposes a client flag to disable nomad remote exec support in
environments where access to tasks ought to be restricted.
I used `disable_remote_exec` client flag that defaults to allowing
remote exec. Opted for a client config that can be used to disable
remote exec globally, or to a subset of the cluster if necessary.
This fixes an issue where batch and service workloads would never be
restarted due to indefinitely blocking on a nil channel.
It also raises the restoration logging message to `Info` to simplify log
analysis.
Without this change, alloc_endpoint cancel the context passed to handler
when we detect EOF. This races driver in setting exit code; and we run
into a case where the exec process terminates cleanly yet we attempt to
mark it as failed with context error.
Here, we rely on the driver to handle errors returned from Stream and
without racing to set an error.
Registration and restoring allocs don't share state or depend on each
other in any way (syncing allocs with servers is done outside of
registration).
Since restoring is synchronous, start the registration goroutine first.
For nodes with lots of allocs to restore or close to their heartbeat
deadline, this could be the difference between becoming "lost" or not.
Refactoring of 104067bc2b2002a4e45ae7b667a476b89addc162
Switch the MarkLive method for a chan that is closed by the client.
Thanks to @notnoop for the idea!
The old approach called a method on most existing ARs and TRs on every
runAllocs call. The new approach does a once.Do call in runAllocs to
accomplish the same thing with less work. Able to remove the gate
abstraction that did much more than was needed.
Fixes#1795
Running restored allocations and pulling what allocations to run from
the server happen concurrently. This means that if a client is rebooted,
and has its allocations rescheduled, it may restart the dead allocations
before it contacts the server and determines they should be dead.
This commit makes tasks that fail to reattach on restore wait until the
server is contacted before restarting.
Related to #4280
This PR adds
`client.allocs.<job>.<group>.<alloc>.<task>.memory.allocated` as a gauge
in bytes to metrics to ease calculating how close a task is to OOMing.
```
'nomad.client.allocs.memory.allocated.example.cache.6d98cbaf-d6bc-2a84-c63f-bfff8905a9d8.redis.rusty': 268435456.000
'nomad.client.allocs.memory.cache.example.cache.6d98cbaf-d6bc-2a84-c63f-bfff8905a9d8.redis.rusty': 5677056.000
'nomad.client.allocs.memory.kernel_max_usage.example.cache.6d98cbaf-d6bc-2a84-c63f-bfff8905a9d8.redis.rusty': 0.000
'nomad.client.allocs.memory.kernel_usage.example.cache.6d98cbaf-d6bc-2a84-c63f-bfff8905a9d8.redis.rusty': 0.000
'nomad.client.allocs.memory.max_usage.example.cache.6d98cbaf-d6bc-2a84-c63f-bfff8905a9d8.redis.rusty': 8908800.000
'nomad.client.allocs.memory.rss.example.cache.6d98cbaf-d6bc-2a84-c63f-bfff8905a9d8.redis.rusty': 876544.000
'nomad.client.allocs.memory.swap.example.cache.6d98cbaf-d6bc-2a84-c63f-bfff8905a9d8.redis.rusty': 0.000
'nomad.client.allocs.memory.usage.example.cache.6d98cbaf-d6bc-2a84-c63f-bfff8905a9d8.redis.rusty': 8208384.000
```
* client: was not using up-to-date client state in determining which alloc count towards allocated resources
* Update client/client.go
Co-Authored-By: cgbaker <cgbaker@hashicorp.com>
This removes an unnecessary shared lock between discovery and heartbeating
which was causing heartbeats to be missed upon retries when a single server
fails. Also made a drive by fix to call the periodic server shuffler goroutine.
This fixes a confusing UX where a previously successful deployment's
healthy/unhealthy count would get updated if any allocations failed after
the deployment was already marked as successful.
Fixes https://github.com/hashicorp/nomad/issues/5587
When a nomad 0.9 client is handling an alloc generated by a nomad 0.8
server, we should check the alloc.TaskResources for networking details
rather than task.Resources.
We check alloc.TaskResources for networking for other tasks in the task
group [1], so it's a bit odd that we used the task.Resources struct
here. TaskRunner also uses `alloc.TaskResources`[2].
The task.Resources struct in 0.8 was sparsly populated, resulting to
storing of 0 in port mapping env vars:
```
vagrant@nomad-server-01:~$ nomad version
Nomad v0.8.7 (21a2d93eecf018ad2209a5eab6aae6c359267933+CHANGES)
vagrant@nomad-server-01:~$ nomad server members
Name Address Port Status Leader Protocol Build Datacenter Region
nomad-server-01.global 10.199.0.11 4648 alive true 2 0.8.7 dc1 global
vagrant@nomad-server-01:~$ nomad alloc status -json 5b34649b | jq '.Job.TaskGroups[0].Tasks[0].Resources.Networks'
[
{
"CIDR": "",
"Device": "",
"DynamicPorts": [
{
"Label": "db",
"Value": 0
}
],
"IP": "",
"MBits": 10,
"ReservedPorts": null
}
]
vagrant@nomad-server-01:~$ nomad alloc status -json 5b34649b | jq '.TaskResources'
{
"redis": {
"CPU": 500,
"DiskMB": 0,
"IOPS": 0,
"MemoryMB": 256,
"Networks": [
{
"CIDR": "",
"Device": "eth1",
"DynamicPorts": [
{
"Label": "db",
"Value": 21722
}
],
"IP": "10.199.0.21",
"MBits": 10,
"ReservedPorts": null
}
]
}
}
```
Also, updated the test values to mimic how Nomad 0.8 structs are
represented, and made its result match the non compact values in
`TestEnvironment_AsList`.
[1] 24e9040b18/client/taskenv/env.go (L624-L639)
[2] https://github.com/hashicorp/nomad/blob/master/client/allocrunner/taskrunner/task_runner.go#L287-L303
This helper returns the token as well as the ACL policy, to be used in a later
commit for logging the token info associated with nomad exec invocation.
This command will be used to send a signal to either a single task within an
allocation, or all of the tasks if <task-name> is omitted. If the sent signal
terminates the allocation, it will be treated as if the allocation has crashed,
rather than as if it was operator-terminated.
Signal validation is currently handled by the driver itself and nomad
does not attempt to restrict or validate them.
Noticed that `detected drivers` log line was misleading - when a driver
doesn't fingerprint before timeout, their health status is empty string
`""` which we would mark as detected.
Now, we log all drivers along with their state to ease driver
fingerprint debugging.
I noticed that `watchNodeUpdates()` almost immediately after
`registerAndHeartbeat()` calls `retryRegisterNode()`, well after 5
seconds.
This call is unnecessary and made debugging a bit harder. So here, we
ensure that we only re-register node for new node events, not for
initial registration.
Here we retain 0.8.7 behavior of waiting for driver fingerprints before
registering a node, with some timeout. This is needed for system jobs,
as system job scheduling for node occur at node registration, and the
race might mean that a system job may not get placed on the node because
of missing drivers.
The timeout isn't strictly necessary, but raising it to 1 minute as it's
closer to indefinitely blocked than 1 second. We need to keep the value
high enough to capture as much drivers/devices, but low enough that
doesn't risk blocking too long due to misbehaving plugin.
Fixes https://github.com/hashicorp/nomad/issues/5579
Currently, when logmon fails to reattach, we will retry reattachment to
the same pid until the task restart specification is exhausted.
Because we cannot clear hook state during error conditions, it is not
possible for us to signal to a future restart that it _shouldn't_
attempt to reattach to the plugin.
Here we revert to explicitly detecting reattachment seperately from a
launch of a new logmon, so we can recover from scenarios where a logmon
plugin has failed.
This is a net improvement over the current hard failure situation, as it
means in the most common case (the pid has gone away), we can recover.
Other reattachment failure modes where the plugin may still be running
could potentially cause a duplicate process, or a subsequent failure to launch
a new plugin.
If there was a duplicate process, it could potentially cause duplicate
logging. This is better than a production workload outage.
If there was a subsequent failure to launch a new plugin, it would fail
in the same (retry until restarts are exhausted) as the current failure
mode.
Renewal time was being calculated as 10s+Intn(lease-10s), so the renewal
time could be very rapid or within 1s of the deadline: [10s, lease)
This commit fixes the renewal time by calculating it as:
(lease/2) +/- 10s
For a lease of 60s this means the renewal will occur in [20s, 40s).
Revert "fingerprint Constraints and Affinities have Equals, as set"
This reverts commit 596f16fb5f1a4a6766a57b3311af806d22382609.
Revert "client tests assert the independent handling of interface and speed"
This reverts commit 7857ac5993a578474d0570819f99b7b6e027de40.
Revert "structs missed applying a style change from the review"
This reverts commit 658916e3274efa438beadc2535f47109d0c2f0f2.
Revert "client, structs comments"
This reverts commit be2838d6baa9d382a5013fa80ea016856f28ade2.
Revert "client fingerprint updateNetworks preserves the network configuration"
This reverts commit fc309cb430e62d8e66267a724f006ae9abe1c63c.
Revert "client_test cleanup comments from review"
This reverts commit bc0bf4efb9114e699bc662f50c8f12319b6b3445.
Revert "client Networks Equals is set equality"
This reverts commit f8d432345b54b1953a4a4c719b9269f845e3e573.
Revert "struct cleanup indentation in RequestedDevice Equals"
This reverts commit f4746411cab328215def6508955b160a53452da3.
Revert "struct Equals checks for identity before value checking"
This reverts commit 0767a4665ed30ab8d9586a59a74db75d51fd9226.
Revert "fix client-test, avoid hardwired platform dependecy on lo0"
This reverts commit e89dbb2ab182b6368507dbcd33c3342223eb0ae7.
Revert "refactor error in client fingerprint to include the offending data"
This reverts commit a7fed726c6e0264d42a58410d840adde780a30f5.
Revert "add client updateNodeResources to merge but preserve manual config"
This reverts commit 84bd433c7e1d030193e054ec23474380ff3b9032.
Revert "refactor struts.RequestedDevice to have its own Equals"
This reverts commit 689782524090e51183474516715aa2f34908b8e6.
Revert "refactor structs.Resource.Networks to have its own Equals"
This reverts commit 49e2e6c77bb3eaa4577772b36c62205061c92fa1.
Revert "refactor structs.Resource.Devices to have its own Equals"
This reverts commit 4ede9226bb971ae42cc203560ed0029897aec2c9.
Revert "add COMPAT(0.10): Remove in 0.10 notes to impl for structs.Resources"
This reverts commit 49fbaace5298d5ccf031eb7ebec93906e1d468b5.
Revert "add structs.Resources Equals"
This reverts commit 8528a2a2a6450e4462a1d02741571b5efcb45f0b.
Revert "test that fingerprint resources are updated, net not clobbered"
This reverts commit 8ee02ddd23bafc87b9fce52b60c6026335bb722d.
This adds a `nomad alloc restart` command and api that allows a job operator
with the alloc-lifecycle acl to perform an in-place restart of a Nomad
allocation, or a given subtask.
Remove runLaunched tracking as Run is *always* called for killable
TaskRunners. TaskRunners which fail before Run can be called (during
NewTaskRunner or Restore) are not killable as they're never added to the
client's alloc map.
This PR switches to using plain fifo files instead of golang structs
managed by containerd/fifo library.
The library main benefit is management of opening fifo files. In Linux,
a reader `open()` request would block until a writer opens the file (and
vice-versa). The library uses goroutines so that it's the first IO
operation that blocks.
This benefit isn't really useful for us: Given that logmon simply
streams output in a separate process, blocking of opening or first read
is effectively the same.
The library additionally makes further complications for managing state
and tracking read/write permission that seems overhead for our use,
compared to using a file directly.
Looking here, I made the following incidental changes:
* document that we do handle if fifo files are already created, as we
rely on that behavior for logmon restarts
* use type system to lock read vs write: currently, fifo library returns
`io.ReadWriteCloser` even if fifo is opened for writing only!
I chose to make them more of integration tests since there's a lot more
plumbing involved. The internal implementation details of how we craft
task envs can now change and these tests will still properly assert the
task runtime environment is setup properly.
Noticed that the protobuf files are out of sync with ones generated by 1.2.0 protoc go plugin.
The cause for these files seem to be related to release processes, e.g. [0.9.0-beta1 preperation](ecec3d38de (diff-da4da188ee496377d456025c2eab4e87)), and [0.9.0-beta3 preperation](b849d84f2f).
This restores the changes to that of the pinned protoc version and fails build if protobuf files are out of sync. Sample failing Travis job is that of the first commit change: https://travis-ci.org/hashicorp/nomad/jobs/506285085
Some of the context uses in TR hooks are useless (Killed during Stop
never seems meaningful).
None of the hooks are interruptable for graceful shutdown which is
unfortunate and probably needs fixing.
Builds upon earlier commit that cleans up restored handles of terminal
allocs by also emitting terminated events and calling exited hooks when
appropriate.
The test is sadly quite complicated and peeks into things (logmon's
reattach config) AR doesn't normally have access to.
However, I couldn't find another way of asserting logmon got cleaned up
without resorting to smaller unit tests. Smaller unit tests risk
re-implementing dependencies in an unrealistic way, so I opted for an
ugly integration test.
This commit is a significant change. TR.Run is now always executed, even
for terminal allocations. This was changed to allow TR.Run to cleanup
(run stop hooks) if a handle was recovered.
This is intended to handle the case of Nomad receiving a
DesiredStatus=Stop allocation update, persisting it, but crashing before
stopping AR/TR.
The commit also renames task runner hook data as it was very easy to
accidently set state on Requests instead of Responses using the old
field names.
Port some integration tests of driver fingerprinting.
Some tests (e.g. `TestFingerprintManager_Run_DriversInBlacklist`) have
been subsituted by more isolated tests in
`client/pluginmanager/drivermanager/manager_test.go`
This code chooses to be conservative as opposed to optimal: when failing
to reattach to logmon simply return a recoverable error instead of
immediately trying to restart logmon.
The recoverable error will cause the task's restart policy to be
applied and a new logmon will be launched upon restart.
Trying to do the optimal approach of simply starting a new logmon
requires error string comparison and should be tested against a task
actively logging to assert the behavior (are writes blocked? dropped?).
There were multiple bugs here:
1. Reattach unmarshalling always returned an error because you can't
unmarshal into a nil pointer.
2. The hook data wasn't being saved because it was put on the request
struct, not the response struct.
3. The plugin configuration should only have reattach *or* a command
set. Not both.
4. Setting Done=true meant the hook was never re-run on agent restart so
reattaching was never attempted.
