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environment_variables.md

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grpc-js environment variables

@grpc/grpc-js exposes some configuration as environment variables that can be set.

For the legacy grpc library, the environment variables are documented in the main gRPC repository

  • grpc_proxy, https_proxy, http_proxy The URI of the proxy to use for HTTP CONNECT support. These variables are checked in order, and the first one that has a value is used.

  • no_grpc_proxy, no_proxy A comma separated list of hostnames to connect to without using a proxy even if a proxy is set. These variables are checked in order, and the first one that has a value is used.

  • GRPC_SSL_CIPHER_SUITES A colon separated list of cipher suites to use with OpenSSL Defaults to the defaults for Node.js

  • GRPC_DEFAULT_SSL_ROOTS_FILE_PATH PEM file to load SSL roots from

  • GRPC_NODE_TRACE, GRPC_TRACE A comma separated list of tracers that provide additional insight into how grpc-js is processing requests via debug logs. Available tracers include:

    • call_stream - Traces client request internals
    • channel - Traces channel events
    • connectivity_state - Traces channel connectivity state changes
    • dns_resolver - Traces DNS resolution
    • ip_resolver - Traces IPv4/v6 resolution
    • pick_first - Traces the pick first load balancing policy
    • proxy - Traces proxy operations
    • resolving_load_balancer - Traces the resolving load balancer
    • round_robin - Traces the round robin load balancing policy
    • server - Traces high-level server events
    • server_call - Traces server handling of individual requests
    • subchannel - Traces subchannel connectivity state and errors
    • subchannel_refcount - Traces subchannel refcount changes. Includes per-call logs.
    • subchannel_flowctrl - Traces HTTP/2 flow control. Includes per-call logs.
    • subchannel_internals - Traces HTTP/2 session state. Includes per-call logs.
    • channel_stacktrace - Traces channel construction events with stack traces.
    • keepalive - Traces gRPC keepalive pings
    • outlier_detection - Traces outlier detection events

    The following tracers are added by the @grpc/grpc-js-xds library:

    • cds_balancer - Traces the CDS load balancing policy
    • eds_balancer - Traces the EDS load balancing policy
    • priority - Traces the priority load balancing policy
    • weighted_target - Traces the weighted target load balancing policy
    • xds_client - Traces the xDS Client
    • xds_cluster_manager - Traces the xDS cluster manager load balancing policy
    • xds_resolver - Traces the xDS name resolver

    'all' can additionally be used to turn all traces on. Individual traces can be disabled by prefixing them with '-'.

  • GRPC_NODE_VERBOSITY, GRPC_VERBOSITY Default gRPC logging verbosity - one of:

    • DEBUG - log all gRPC messages
    • INFO - log INFO and ERROR message
    • ERROR - log only errors (default)
    • NONE - won't log any