Registering gRPC balancers is thread-unsafe because they are stored in a
global map variable that is accessed without holding a lock. Therefore,
it's expected that balancers are registered _once_ at the beginning of
your program (e.g. in a package `init` function) and certainly not after
you've started dialing connections, etc.
> NOTE: this function must only be called during initialization time
> (i.e. in an init() function), and is not thread-safe.
While this is fine for us in production, it's challenging for tests that
spin up multiple agents in-memory. We currently register a balancer per-
agent which holds agent-specific state that cannot safely be shared.
This commit introduces our own registry that _is_ thread-safe, and
implements the Builder interface such that we can call gRPC's `Register`
method once, on start-up. It uses the same pattern as our resolver
registry where we use the dial target's host (aka "authority"), which is
unique per-agent, to determine which builder to use.
* inject logger and create logdrop sink
* init sink with an empty struct instead of nil
* wrap a logger instead of a sink and add a discard logger to avoid double logging
* fix compile errors
* fix linter errors
* Fix bug where log arguments aren't properly formatted
* Move log sink construction outside of handler
* Add prometheus definition and docs for log drop counter
Co-authored-by: Daniel Upton <daniel@floppy.co>
This is the OSS portion of enterprise PR 3822.
Adds a custom gRPC balancer that replicates the router's server cycling
behavior. Also enables automatic retries for RESOURCE_EXHAUSTED errors,
which we now get for free.
Fix an issue where rpc_hold_timeout was being used as the timeout for non-blocking queries. Users should be able to tune read timeouts without fiddling with rpc_hold_timeout. A new configuration `rpc_read_timeout` is created.
Refactor some implementation from the original PR 11500 to remove the misleading linkage between RPCInfo's timeout (used to retry in case of certain modes of failures) and the client RPC timeouts.
* Move stats.go from grpc-internal to grpc-middleware
* Update grpc server metrics with server type label
* Add stats test to grpc-external
* Remove global metrics instance from grpc server tests
Prior to #13244, connect proxies and gateways could only be configured by an
xDS session served by the local client agent.
In an upcoming release, it will be possible to deploy a Consul service mesh
without client agents. In this model, xDS sessions will be handled by the
servers themselves, which necessitates load-balancing to prevent a single
server from receiving a disproportionate amount of load and becoming
overwhelmed.
This introduces a simple form of load-balancing where Consul will attempt to
achieve an even spread of load (xDS sessions) between all healthy servers.
It does so by implementing a concurrent session limiter (limiter.SessionLimiter)
and adjusting the limit according to autopilot state and proxy service
registrations in the catalog.
If a server is already over capacity (i.e. the session limit is lowered),
Consul will begin draining sessions to rebalance the load. This will result
in the client receiving a `RESOURCE_EXHAUSTED` status code. It is the client's
responsibility to observe this response and reconnect to a different server.
Users of the gRPC client connection brokered by the
consul-server-connection-manager library will get this for free.
The rate at which Consul will drain sessions to rebalance load is scaled
dynamically based on the number of proxies in the catalog.
Previously, public referred to gRPC services that are both exposed on
the dedicated gRPC port and have their definitions in the proto-public
directory (so were considered usable by 3rd parties). Whereas private
referred to services on the multiplexed server port that are only usable
by agents and other servers.
Now, we're splitting these definitions, such that external/internal
refers to the port and public/private refers to whether they can be used
by 3rd parties.
This is necessary because the peering replication API needs to be
exposed on the dedicated port, but is not (yet) suitable for use by 3rd
parties.
This is the OSS portion of enterprise PR 2056.
This commit provides server-local implementations of the proxycfg.ConfigEntry
and proxycfg.ConfigEntryList interfaces, that source data from streaming events.
It makes use of the LocalMaterializer type introduced for peering replication,
adding the necessary support for authorization.
It also adds support for "wildcard" subscriptions (within a topic) to the event
publisher, as this is needed to fetch service-resolvers for all services when
configuring mesh gateways.
Currently, events will be emitted for just the ingress-gateway, service-resolver,
and mesh config entry types, as these are the only entries required by proxycfg
— the events will be emitted on topics named IngressGateway, ServiceResolver,
and MeshConfig topics respectively.
Though these events will only be consumed "locally" for now, they can also be
consumed via the gRPC endpoint (confirmed using grpcurl) so using them from
client agents should be a case of swapping the LocalMaterializer for an
RPCMaterializer.
- Introduce a new telemetry configurable parameter retry_failed_connection. User can set the value to true to let consul agent continue its start process on failed connection to datadog server. When set to false, agent will stop on failed start. The default behavior is true.
Co-authored-by: Dan Upton <daniel@floppy.co>
Co-authored-by: Evan Culver <eculver@users.noreply.github.com>
Adds a timeout (deadline) to client RPC calls, so that streams will no longer hang indefinitely in unstable network conditions.
Co-authored-by: kisunji <ckim@hashicorp.com>
* add config watcher to the config package
* add logging to watcher
* add test and refactor to add WatcherEvent.
* add all API calls and fix a bug with recreated files
* add tests for watcher
* remove the unnecessary use of context
* Add debug log and a test for file rename
* use inode to detect if the file is recreated/replaced and only listen to create events.
* tidy ups (#1535)
* tidy ups
* Add tests for inode reconcile
* fix linux vs windows syscall
* fix linux vs windows syscall
* fix windows compile error
* increase timeout
* use ctime ID
* remove remove/creation test as it's a use case that fail in linux
* fix linux/windows to use Ino/CreationTime
* fix the watcher to only overwrite current file id
* fix linter error
* fix remove/create test
* set reconcile loop to 200 Milliseconds
* fix watcher to not trigger event on remove, add more tests
* on a remove event try to add the file back to the watcher and trigger the handler if success
* fix race condition
* fix flaky test
* fix race conditions
* set level to info
* fix when file is removed and get an event for it after
* fix to trigger handler when we get a remove but re-add fail
* fix error message
* add tests for directory watch and fixes
* detect if a file is a symlink and return an error on Add
* rename Watcher to FileWatcher and remove symlink deref
* add fsnotify@v1.5.1
* fix go mod
* do not reset timer on errors, rename OS specific files
* rename New func
* events trigger on write and rename
* add missing test
* fix flaking tests
* fix flaky test
* check reconcile when removed
* delete invalid file
* fix test to create files with different mod time.
* back date file instead of sleeping
* add watching file in agent command.
* fix watcher call to use new API
* add configuration and stop watcher when server stop
* add certs as watched files
* move FileWatcher to the agent start instead of the command code
* stop watcher before replacing it
* save watched files in agent
* add add and remove interfaces to the file watcher
* fix remove to not return an error
* use `Add` and `Remove` to update certs files
* fix tests
* close events channel on the file watcher even when the context is done
* extract `NotAutoReloadableRuntimeConfig` is a separate struct
* fix linter errors
* add Ca configs and outgoing verify to the not auto reloadable config
* add some logs and fix to use background context
* add tests to auto-config reload
* remove stale test
* add tests to changes to config files
* add check to see if old cert files still trigger updates
* rename `NotAutoReloadableRuntimeConfig` to `StaticRuntimeConfig`
* fix to re add both key and cert file. Add test to cover this case.
* review suggestion
Co-authored-by: R.B. Boyer <4903+rboyer@users.noreply.github.com>
* add check to static runtime config changes
* fix test
* add changelog file
* fix review comments
* Apply suggestions from code review
Co-authored-by: R.B. Boyer <4903+rboyer@users.noreply.github.com>
* update flag description
Co-authored-by: FFMMM <FFMMM@users.noreply.github.com>
* fix compilation error
* add static runtime config support
* fix test
* fix review comments
* fix log test
* Update .changelog/12329.txt
Co-authored-by: Dan Upton <daniel@floppy.co>
* transfer tests to runtime_test.go
* fix filewatcher Replace to not deadlock.
* avoid having lingering locks
Co-authored-by: R.B. Boyer <4903+rboyer@users.noreply.github.com>
* split ReloadConfig func
* fix warning message
Co-authored-by: R.B. Boyer <4903+rboyer@users.noreply.github.com>
* convert `FileWatcher` into an interface
* fix compilation errors
* fix tests
* extract func for adding and removing files
Co-authored-by: Ashwin Venkatesh <ashwin@hashicorp.com>
Co-authored-by: R.B. Boyer <4903+rboyer@users.noreply.github.com>
Co-authored-by: FFMMM <FFMMM@users.noreply.github.com>
Co-authored-by: Daniel Upton <daniel@floppy.co>
Introduces the capability to configure TLS differently for Consul's
listeners/ports (i.e. HTTPS, gRPC, and the internal multiplexed RPC
port) which is useful in scenarios where you may want the HTTPS or
gRPC interfaces to present a certificate signed by a well-known/public
CA, rather than the certificate used for internal communication which
must have a SAN in the form `server.<dc>.consul`.
We have seen test flakes caused by 'concurrent map read and map write', and the race detector
reports the problem as well (prevent us from running some tests with -race).
The root of the problem is the grpc expects resolvers to be registered at init time
before any requests are made, but we were using a separate resolver for each test.
This commit introduces a resolver registry. The registry is registered as the single
resolver for the consul scheme. Each test uses the Authority section of the target
(instead of the scheme) to identify the resolver that should be used for the test.
The scheme is used for lookup, which is why it can no longer be used as the unique
key.
This allows us to use a lock around the map of resolvers, preventing the data race.
The bulk of this commit is moving the LeaderRoutineManager from the agent/consul package into its own package: lib/gort. It also got a renaming and its Start method now requires a context. Requiring that context required updating a whole bunch of other places in the code.
* WIP reloadable raft config
* Pre-define new raft gauges
* Update go-metrics to change gauge reset behaviour
* Update raft to pull in new metric and reloadable config
* Add snapshot persistance timing and installSnapshot to our 'protected' list as they can be infrequent but are important
* Update telemetry docs
* Update config and telemetry docs
* Add note to oldestLogAge on when it is visible
* Add changelog entry
* Update website/content/docs/agent/options.mdx
Co-authored-by: Matt Keeler <mkeeler@users.noreply.github.com>
Co-authored-by: Matt Keeler <mkeeler@users.noreply.github.com>
grpclog.SetLoggerV2 is meant to be called only once before any gRPC requests are received, but
each test that uses TestAgent will call NewBaseDeps again. Use a sync.Once to prevent the grpc
logging from being re-initialized by each test.
This will mean that a test can't use a fake logger to capture logs from the gRPC server.
This commit reduces the interface to Load() a bit, in preparation for
unexporting NewBuilder and having everything call Load.
The three arguments are reduced to a single argument by moving the other
two into the options struct.
The three return values are reduced to two by moving the RuntimeConfig
and Warnings into a LoadResult struct.
* create consul version metric with version label
* agent/agent.go: add pre-release Version as well as label
Co-Authored-By: Radha13 <kumari.radha3@gmail.com>
* verion and pre-release version labels.
* hyphen/- breaks prometheus
* Add Prometheus gauge defintion for version metric
* Add new metric to telemetry docs
Co-authored-by: Radha Kumari <kumari.radha3@gmail.com>
Co-authored-by: Aestek <thib.gilles@gmail.com>
Co-authored-by: Daniel Nephin <dnephin@hashicorp.com>
