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gRPC environment variables
--------------------------
gRPC C core based implementations (those contained in this repository) expose
some configuration as environment variables that can be set.
* http_proxy
The URI of the proxy to use for HTTP CONNECT support.
* GRPC_ABORT_ON_LEAKS
A debugging aid to cause a call to abort() when gRPC objects are leaked past
grpc_shutdown(). Set to 1 to cause the abort, if unset or 0 it does not
abort the process.
* GOOGLE_APPLICATION_CREDENTIALS
The path to find the credentials to use when Google credentials are created
* GRPC_SSL_CIPHER_SUITES
A colon separated list of cipher suites to use with OpenSSL
Defaults to:
ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES256-GCM-SHA384
* GRPC_DEFAULT_SSL_ROOTS_FILE_PATH
PEM file to load SSL roots from
* GRPC_POLL_STRATEGY [posix-style environments only]
Declares which polling engines to try when starting gRPC.
This is a comma-separated list of engines, which are tried in priority order
first -> last.
Available polling engines include:
- epoll (linux-only) - a polling engine based around the epoll family of
system calls
- poll - a portable polling engine based around poll(), intended to be a
fallback engine when nothing better exists
- legacy - the (deprecated) original polling engine for gRPC
* GRPC_TRACE
A comma separated list of tracers that provide additional insight into how
gRPC C core is processing requests via debug logs. Available tracers include:
- api - traces api calls to the C core
- bdp_estimator - traces behavior of bdp estimation logic
- call_combiner - traces call combiner state
- call_error - traces the possible errors contributing to final call status
- channel - traces operations on the C core channel stack
- client_channel - traces client channel activity, including resolver
and load balancing policy interaction
- combiner - traces combiner lock state
- compression - traces compression operations
- connectivity_state - traces connectivity state changes to channels
- channel_stack_builder - traces information about channel stacks being built
- http - traces state in the http2 transport engine
- http1 - traces HTTP/1.x operations performed by gRPC
- inproc - traces the in-process transport
- flowctl - traces http2 flow control
- op_failure - traces error information when failure is pushed onto a
completion queue
- round_robin - traces the round_robin load balancing policy
- pick_first - traces the pick first load balancing policy
- resource_quota - trace resource quota objects internals
- glb - traces the grpclb load balancer
- queue_pluck
- queue_timeout
- server_channel - lightweight trace of significant server channel events
- secure_endpoint - traces bytes flowing through encrypted channels
- timer - timers (alarms) in the grpc internals
- timer_check - more detailed trace of timer logic in grpc internals
- transport_security - traces metadata about secure channel establishment
- tcp - traces bytes in and out of a channel
- tsi - traces tsi transport security
The following tracers will only run in binaries built in DEBUG mode. This is
accomplished by invoking `CONFIG=dbg make <target>`
- alarm_refcount - refcounting traces for grpc_alarm structure
- metadata - tracks creation and mutation of metadata
- closure - tracks closure creation, scheduling, and completion
- pending_tags - traces still-in-progress tags on completion queues
- polling - traces the selected polling engine
- queue_refcount
- error_refcount
- stream_refcount
- workqueue_refcount
- fd_refcount
- cq_refcount
- auth_context_refcount
- security_connector_refcount
- resolver_refcount
- lb_policy_refcount
- chttp2_refcount
'all' can additionally be used to turn all traces on.
Individual traces can be disabled by prefixing them with '-'.
'refcount' will turn on all of the tracers for refcount debugging.
if 'list_tracers' is present, then all of the available tracers will be
printed when the program starts up.
Example:
export GRPC_TRACE=all,-pending_tags
* GRPC_VERBOSITY
Default gRPC logging verbosity - one of:
- DEBUG - log all gRPC messages
- INFO - log INFO and ERROR message
- ERROR - log only errors
* GRPC_TRACE_FUZZER
if set, the fuzzers will output trace (it is usually supressed).
* GRPC_DNS_RESOLVER
Declares which DNS resolver to use. The default is ares if gRPC is built with
c-ares support. Otherwise, the value of this environment variable is ignored.
Available DNS resolver include:
- native (default)- a DNS resolver based around getaddrinfo(), creates a new thread to
perform name resolution
- ares - a DNS resolver based around the c-ares library
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