Nomad jobs may be configured with a TaskGroup which contains a Service
definition that is Consul Connect enabled. These service definitions end
up establishing a Consul Connect Proxy Task (e.g. envoy, by default). In
the case where Consul ACLs are enabled, a Service Identity token is required
for these tasks to run & connect, etc. This changeset enables the Nomad Server
to recieve RPC requests for the derivation of SI tokens on behalf of instances
of Consul Connect using Tasks. Those tokens are then relayed back to the
requesting Client, which then injects the tokens in the secrets directory of
the Task.
This change provides an initial pass at setting up the configuration necessary to
enable use of Connect with Consul ACLs. Operators will be able to pass in a Consul
Token through `-consul-token` or `$CONSUL_TOKEN` in the `job run` and `job revert`
commands (similar to Vault tokens).
These values are not actually used yet in this changeset.
Introduce limits to prevent unauthorized users from exhausting all
ephemeral ports on agents:
* `{https,rpc}_handshake_timeout`
* `{http,rpc}_max_conns_per_client`
The handshake timeout closes connections that have not completed the TLS
handshake by the deadline (5s by default). For RPC connections this
timeout also separately applies to first byte being read so RPC
connections with TLS enabled have `rpc_handshake_time * 2` as their
deadline.
The connection limit per client prevents a single remote TCP peer from
exhausting all ephemeral ports. The default is 100, but can be lowered
to a minimum of 26. Since streaming RPC connections create a new TCP
connection (until MultiplexV2 is used), 20 connections are reserved for
Raft and non-streaming RPCs to prevent connection exhaustion due to
streaming RPCs.
All limits are configurable and may be disabled by setting them to `0`.
This also includes a fix that closes connections that attempt to create
TLS RPC connections recursively. While only users with valid mTLS
certificates could perform such an operation, it was added as a
safeguard to prevent programming errors before they could cause resource
exhaustion.
Passes in agent enable_debug config to nomad server and client configs.
This allows for rpc endpoints to have more granular control if they
should be enabled or not in combination with ACLs.
enable debug on client test
copy struct values
ensure groupserviceHook implements RunnerPreKillhook
run deregister first
test that shutdown times are delayed
move magic number into variable
Copy the updated version of freeport (sdk/freeport), and tweak it for use
in Nomad tests. This means staying below port 10000 to avoid conflicts with
the lib/freeport that is still transitively used by the old version of
consul that we vendor. Also provide implementations to find ephemeral ports
of macOS and Windows environments.
Ports acquired through freeport are supposed to be returned to freeport,
which this change now also introduces. Many tests are modified to include
calls to a cleanup function for Server objects.
This should help quite a bit with some flakey tests, but not all of them.
Our port problems will not go away completely until we upgrade our vendor
version of consul. With Go modules, we'll probably do a 'replace' to swap
out other copies of freeport with the one now in 'nomad/helper/freeport'.
The test asserts that alloc counts get reported accurately in metrics by
inspecting the metrics endpoint directly. Sadly, the metrics as
collected by `armon/go-metrics` seem to be stateful and may contain info
from other tests.
This means that the test can fail depending on the order of returned
metrics.
Inspecting the metrics output of one failing run, you can see the
duplicate guage entries but for different node_ids:
```
{
"Name": "service-name.default-0a3ba4b6-2109-485e-be74-6864228aed3d.client.allocations.terminal",
"Value": 10,
"Labels": {
"datacenter": "dc1",
"node_class": "none",
"node_id": "67402bf4-00f3-bd8d-9fa8-f4d1924a892a"
}
},
{
"Name": "service-name.default-0a3ba4b6-2109-485e-be74-6864228aed3d.client.allocations.terminal",
"Value": 0,
"Labels": {
"datacenter": "dc1",
"node_class": "none",
"node_id": "a2945b48-7e66-68e2-c922-49b20dd4e20c"
}
},
```
Noticed that ACL endpoints return 500 status code for user errors. This
is confusing and can lead to false monitoring alerts.
Here, I introduce a concept of RPCCoded errors to be returned by RPC
that signal a code in addition to error message. Codes for now match
HTTP codes to ease reasoning.
```
$ nomad acl bootstrap
Error bootstrapping: Unexpected response code: 500 (ACL bootstrap already done (reset index: 9))
$ nomad acl bootstrap
Error bootstrapping: Unexpected response code: 400 (ACL bootstrap already done (reset index: 9))
```
* client: improve group service stanza interpolation and check_restart support
Interpolation can now be done on group service stanzas. Note that some task runtime specific information
that was previously available when the service was registered poststart of a task is no longer available.
The check_restart stanza for checks defined on group services will now properly restart the allocation upon
check failures if configured.
handle the case where we request a server-id which is this current server
update docs, error on node and server id params
more accurate names for tests
use shared no leader err, formatting
rm bad comment
remove redundant variable
This is the basic code to add the Windows Service Manager hooks to Nomad.
Includes vendoring golang.org/x/sys/windows/svc and added Docs:
* guide for installing as a windows service.
* configuration for logging to file from PR #6429
Nomad web UI currently fails when querying client nodes for allocation
state end endpoints, due to CORS policy.
The issue is that CORS requests that are marked `withCredentials` need
the http server to include a `Access-Control-Allow-Credentials` [1].
But Nomad Task Logs and filesystem requests include authenticating
information and thus marked with `credentials=true`[2][3].
It's worth noting that the browser currently sends credentials and
authentication token to servers anyway; it's just that the response is
not made available to caller nomad ui javascript. For task logs
specifically, nomad ui retries again by querying the web ui address
(typically pointing to a nomad server) which will forward the request
to the nomad client agent appropriately.
[1] https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Credentials
[2] 101d0373ee/ui/app/components/task-log.js (L50)
[3] 101d0373ee/ui/app/services/token.js (L25-L39)
Addresses feedback around monitor implementation
subselect on stopCh to prevent blocking forever.
Set up a separate goroutine to check every 3 seconds for dropped
messages.
rename returned ch to avoid confusion
Adds new package that can be used by client and server RPC endpoints to
facilitate monitoring based off of a logger
clean up old code
small comment about write
rm old comment about minsize
rename to Monitor
Removes connection logic from monitor command
Keep connection logic in endpoints, use a channel to send results from
monitoring
use new multisink logger and interfaces
small test for dropped messages
update go-hclogger and update sink/intercept logger interfaces
Adds nomad monitor command. Like consul monitor, this command allows you
to stream logs from a nomad agent in real time with a a specified log
level
add endpoint tests
Upgrade go-hclog to latest version
The current version of go-hclog pads log prefixes to equal lengths
so info becomes [INFO ] and debug becomes [DEBUG]. This breaks
hashicorp/logutils/level.go Check function. Upgrading to the latest
version removes this padding and fixes log filtering that uses logutils
Check
AgentMonitor is an endpoint to stream logs for a given agent. It allows
callers to pass in a supplied log level, which may be different than the
agents config allowing for temporary debugging with lower log levels.
Pass in logWriter when setting up Agent
makeAllocTaskServices did not do a nil check on AllocatedResources
which causes a panic when upgrading directly from 0.8 to 0.10. While
skipping 0.9 is not supported we intend to fix serious crashers caused
by such upgrades to prevent cluster outages.
I did a quick audit of the client package and everywhere else that
accesses AllocatedResources appears to be properly guarded by a nil
check.
This commit introduces support for configuring mount propagation when
mounting volumes with the `volume_mount` stanza on Linux targets.
Similar to Kubernetes, we expose 3 options for configuring mount
propagation:
- private, which is equivalent to `rprivate` on Linux, which does not allow the
container to see any new nested mounts after the chroot was created.
- host-to-task, which is equivalent to `rslave` on Linux, which allows new mounts
that have been created _outside of the container_ to be visible
inside the container after the chroot is created.
- bidirectional, which is equivalent to `rshared` on Linux, which allows both
the container to see new mounts created on the host, but
importantly _allows the container to create mounts that are
visible in other containers an don the host_
private and host-to-task are safe, but bidirectional mounts can be
dangerous, as if the code inside a container creates a mount, and does
not clean it up before tearing down the container, it can cause bad
things to happen inside the kernel.
To add a layer of safety here, we require that the user has ReadWrite
permissions on the volume before allowing bidirectional mounts, as a
defense in depth / validation case, although creating mounts should also require
a priviliged execution environment inside the container.
Currently this assumes that a short write will never happen. While these
are improbable in a case where rotation being off a few bytes would
matter, this now correctly tracks the number of written bytes.
Currently this logging implementation is dependent on the order of files
as returned by filepath.Glob, which although internal methods are
documented to be lexographical, does not publicly document this. Here we
defensively resort.
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.
This commit introduces a rotating file logger for Nomad Agent Logs. The
logger implementation itself is a lift and shift from Consul, with tests
updated to fit with the Nomad pattern of using require, and not having a
testutil for creating tempdirs cleanly.
This fixes two bugs:
First, FS Logs API endpoint only propagated error back to user if it was
encoded with code, which isn't common. Other errors get suppressed and
callers get an empty response with 200 error code. Now, these endpoints
return a 500 status code along with the error message.
Before
```
$ curl -v "http://127.0.0.1:4646/v1/client/fs/logs/qwerqwera?follow=false&offset=0&origin=start®ion=global&task=redis&type=stdout"; echo
* Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to 127.0.0.1 (127.0.0.1) port 4646 (#0)
> GET /v1/client/fs/logs/qwerqwera?follow=false&offset=0&origin=start®ion=global&task=redis&type=stdout HTTP/1.1
> Host: 127.0.0.1:4646
> User-Agent: curl/7.54.0
> Accept: */*
>
< HTTP/1.1 200 OK
< Vary: Accept-Encoding
< Vary: Origin
< Date: Fri, 04 Oct 2019 19:47:21 GMT
< Content-Length: 0
<
* Connection #0 to host 127.0.0.1 left intact
```
After
```
$ curl -v "http://127.0.0.1:4646/v1/client/fs/logs/qwerqwera?follow=false&offset=0&origin=start®ion=global&task=redis&type=stdout"; echo
* Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to 127.0.0.1 (127.0.0.1) port 4646 (#0)
> GET /v1/client/fs/logs/qwerqwera?follow=false&offset=0&origin=start®ion=global&task=redis&type=stdout HTTP/1.1
> Host: 127.0.0.1:4646
> User-Agent: curl/7.54.0
> Accept: */*
>
< HTTP/1.1 500 Internal Server Error
< Vary: Accept-Encoding
< Vary: Origin
< Date: Fri, 04 Oct 2019 19:48:12 GMT
< Content-Length: 60
< Content-Type: text/plain; charset=utf-8
<
* Connection #0 to host 127.0.0.1 left intact
alloc lookup failed: index error: UUID must be 36 characters
```
Second, we return 400 status code for request validation errors.
Before
```
$ curl -v "http://127.0.0.1:4646/v1/client/fs/logs/qwerqwera"; echo
* Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to 127.0.0.1 (127.0.0.1) port 4646 (#0)
> GET /v1/client/fs/logs/qwerqwera HTTP/1.1
> Host: 127.0.0.1:4646
> User-Agent: curl/7.54.0
> Accept: */*
>
< HTTP/1.1 500 Internal Server Error
< Vary: Accept-Encoding
< Vary: Origin
< Date: Fri, 04 Oct 2019 19:47:29 GMT
< Content-Length: 22
< Content-Type: text/plain; charset=utf-8
<
* Connection #0 to host 127.0.0.1 left intact
must provide task name
```
After
```
$ curl -v "http://127.0.0.1:4646/v1/client/fs/logs/qwerqwera"; echo
* Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to 127.0.0.1 (127.0.0.1) port 4646 (#0)
> GET /v1/client/fs/logs/qwerqwera HTTP/1.1
> Host: 127.0.0.1:4646
> User-Agent: curl/7.54.0
> Accept: */*
>
< HTTP/1.1 400 Bad Request
< Vary: Accept-Encoding
< Vary: Origin
< Date: Fri, 04 Oct 2019 19:49:18 GMT
< Content-Length: 22
< Content-Type: text/plain; charset=utf-8
<
* Connection #0 to host 127.0.0.1 left intact
must provide task name
```
Without a `LocalServicePort`, Connect services will try to use the
mapped port even when delivering traffic locally. A user can override
this behavior by pinning the port value in the `service` stanza but
this prevents us from using the Consul service name to reach the
service.
This commits configures the Consul proxy with its `LocalServicePort`
and `LocalServiceAddress` fields.
Seth Hoenig