Multiplexer continues to create rpc connections even when
the context which is passed to the underlying rpc connections
is cancelled by the server.
This was causing #4413 - when a SIGHUP causes everything to reload,
it uses context to cancel the underlying http/rpc connections
so that they may come up with the new configuration.
The multiplexer was not being cancelled properly so it would
continue to create rpc connections and constantly fail,
causing communication issues with other nomad agents.
Fixes#4413
This PR introduces an ack allowing the receiving end of the streaming
RPC to return any error that may have occured during the establishment
of the streaming RPC.
* Allow server TLS configuration to be reloaded via SIGHUP
* dynamic tls reloading for nomad agents
* code cleanup and refactoring
* ensure keyloader is initialized, add comments
* allow downgrading from TLS
* initalize keyloader if necessary
* integration test for tls reload
* fix up test to assert success on reloaded TLS configuration
* failure in loading a new TLS config should remain at current
Reload only the config if agent is already using TLS
* reload agent configuration before specific server/client
lock keyloader before loading/caching a new certificate
* introduce a get-or-set method for keyloader
* fixups from code review
* fix up linting errors
* fixups from code review
* add lock for config updates; improve copy of tls config
* GetCertificate only reloads certificates dynamically for the server
* config updates/copies should be on agent
* improve http integration test
* simplify agent reloading storing a local copy of config
* reuse the same keyloader when reloading
* Test that server and client get reloaded but keep keyloader
* Keyloader exposes GetClientCertificate as well for outgoing connections
* Fix spelling
* correct changelog style
Fixes#2525
We used to be checking a RequireTLS field that was never set. Instead we
can just check the TLSConfig.EnableRPC field and require TLS if it's
enabled.
Added a few unfortunately slow integration tests to assert the intended
behavior of misconfigured RPC TLS.
Also disable a lot of noisy test logging when -v isn't specified.
Reduce future confusion by introducing a minor version that is gossiped out
via the `mvn` Serf tag (Minor Version Number, `vsn` is already being used for
to communicate `Major Version Number`).
Background: hashicorp/consul/issues/1346#issuecomment-151663152
This reverts commit a687ee6df316ffadac5305f4be9cf9a5642cd6af.
The LZW compression reduces the file size by ~60%, but increases
our encode and decode costs by 2x in a CPU bottlenecked path.
