mirror of https://github.com/grpc/grpc.git
The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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155 lines
6.7 KiB
155 lines
6.7 KiB
gRPC environment variables |
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gRPC C core based implementations (those contained in this repository) expose |
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some configuration as environment variables that can be set. |
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* http_proxy |
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The URI of the proxy to use for HTTP CONNECT support. |
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* GRPC_ABORT_ON_LEAKS |
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A debugging aid to cause a call to abort() when gRPC objects are leaked past |
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grpc_shutdown(). Set to 1 to cause the abort, if unset or 0 it does not |
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abort the process. |
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* GOOGLE_APPLICATION_CREDENTIALS |
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The path to find the credentials to use when Google credentials are created |
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* GRPC_SSL_CIPHER_SUITES |
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A colon separated list of cipher suites to use with OpenSSL |
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Defaults to: |
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ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384 |
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* GRPC_DEFAULT_SSL_ROOTS_FILE_PATH |
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PEM file to load SSL roots from |
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* GRPC_POLL_STRATEGY [posix-style environments only] |
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Declares which polling engines to try when starting gRPC. |
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This is a comma-separated list of engines, which are tried in priority order |
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first -> last. |
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Available polling engines include: |
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- epoll (linux-only) - a polling engine based around the epoll family of |
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system calls |
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- poll - a portable polling engine based around poll(), intended to be a |
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fallback engine when nothing better exists |
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- legacy - the (deprecated) original polling engine for gRPC |
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* GRPC_TRACE |
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A comma separated list of tracers that provide additional insight into how |
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gRPC C core is processing requests via debug logs. Available tracers include: |
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- api - traces api calls to the C core |
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- bdp_estimator - traces behavior of bdp estimation logic |
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- call_combiner - traces call combiner state |
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- call_error - traces the possible errors contributing to final call status |
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- cares_resolver - traces operations of the c-ares based DNS resolver |
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- cares_address_sorting - traces operations of the c-ares based DNS |
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resolver's resolved address sorter |
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- channel - traces operations on the C core channel stack |
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- client_channel - traces client channel activity, including resolver |
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and load balancing policy interaction |
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- compression - traces compression operations |
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- connectivity_state - traces connectivity state changes to channels |
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- executor - traces grpc's internal thread pool ('the executor') |
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- fd_trace - traces fd create(), shutdown() and close() calls for channel fds. |
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Also traces epoll fd create()/close() calls in epollex polling engine |
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traces epoll-fd creation/close calls for epollex polling engine |
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- glb - traces the grpclb load balancer |
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- handshaker - traces handshaking state |
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- health_check_client - traces health checking client code |
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- http - traces state in the http2 transport engine |
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- http2_stream_state - traces all http2 stream state mutations. |
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- http1 - traces HTTP/1.x operations performed by gRPC |
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- inproc - traces the in-process transport |
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- flowctl - traces http2 flow control |
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- op_failure - traces error information when failure is pushed onto a |
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completion queue |
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- pick_first - traces the pick first load balancing policy |
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- plugin_credentials - traces plugin credentials |
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- pollable_refcount - traces reference counting of 'pollable' objects (only |
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in DEBUG) |
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- resource_quota - trace resource quota objects internals |
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- round_robin - traces the round_robin load balancing policy |
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- queue_pluck |
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- server_channel - lightweight trace of significant server channel events |
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- secure_endpoint - traces bytes flowing through encrypted channels |
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- timer - timers (alarms) in the grpc internals |
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- timer_check - more detailed trace of timer logic in grpc internals |
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- transport_security - traces metadata about secure channel establishment |
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- tcp - traces bytes in and out of a channel |
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- tsi - traces tsi transport security |
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The following tracers will only run in binaries built in DEBUG mode. This is |
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accomplished by invoking `CONFIG=dbg make <target>` |
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- alarm_refcount - refcounting traces for grpc_alarm structure |
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- metadata - tracks creation and mutation of metadata |
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- combiner - traces combiner lock state |
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- closure - tracks closure creation, scheduling, and completion |
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- pending_tags - traces still-in-progress tags on completion queues |
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- polling - traces the selected polling engine |
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- polling_api - traces the api calls to polling engine |
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- queue_refcount |
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- error_refcount |
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- stream_refcount |
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- workqueue_refcount |
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- fd_refcount |
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- cq_refcount |
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- auth_context_refcount |
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- security_connector_refcount |
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- resolver_refcount |
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- lb_policy_refcount |
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- chttp2_refcount |
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'all' can additionally be used to turn all traces on. |
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Individual traces can be disabled by prefixing them with '-'. |
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'refcount' will turn on all of the tracers for refcount debugging. |
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if 'list_tracers' is present, then all of the available tracers will be |
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printed when the program starts up. |
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Example: |
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export GRPC_TRACE=all,-pending_tags |
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* GRPC_VERBOSITY |
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Default gRPC logging verbosity - one of: |
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- DEBUG - log all gRPC messages |
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- INFO - log INFO and ERROR message |
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- ERROR - log only errors |
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* GRPC_TRACE_FUZZER |
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if set, the fuzzers will output trace (it is usually suppressed). |
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* GRPC_DNS_RESOLVER |
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Declares which DNS resolver to use. The default is ares if gRPC is built with |
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c-ares support. Otherwise, the value of this environment variable is ignored. |
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Available DNS resolver include: |
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- native (default)- a DNS resolver based around getaddrinfo(), creates a new thread to |
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perform name resolution |
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- ares - a DNS resolver based around the c-ares library |
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* GRPC_CLIENT_CHANNEL_BACKUP_POLL_INTERVAL_MS |
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Default: 5000 |
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Declares the interval between two backup polls on client channels. These polls |
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are run in the timer thread so that gRPC can process connection failures while |
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there is no active polling thread. They help reconnect disconnected client |
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channels (mostly due to idleness), so that the next RPC on this channel won't |
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fail. Set to 0 to turn off the backup polls. |
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* GRPC_EXPERIMENTAL_DISABLE_FLOW_CONTROL |
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if set, flow control will be effectively disabled. Max out all values and |
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assume the remote peer does the same. Thus we can ignore any flow control |
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bookkeeping, error checking, and decision making |
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* grpc_cfstream |
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set to 1 to turn on CFStream experiment. With this experiment gRPC uses CFStream API to make TCP |
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connections. The option is only available on iOS platform and when macro GRPC_CFSTREAM is defined. |
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* GRPC_ARENA_INIT_STRATEGY |
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Selects the initialization strategy for blocks allocated in the arena. Valid |
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values are: |
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- no_init (default): Do not initialize the arena block. |
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- zero_init: Initialize the arena blocks with 0. |
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- non_zero_init: Initialize the arena blocks with a non-zero value. |
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NOTE: This environment variable is experimental and will be removed. Thus, it |
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should not be relied upon.
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