Debug

Envoy Admin Interface

Envoy has a built-in admin server that has a large amount of useful tools for debugging. The full abilities of this interface can be found in the docs, but some highlights are given here.

Log Levels

Envoy has the ability to set different log levels for different components of the running system. To see how they're all currently set:

NOTE all examples below assume the admin interface is started on port 8001 (the default option). Adjust according to your configuration.

/app $ curl -X POST localhost:8001/logging
active loggers:
admin: info
assert: info
backtrace: info
client: info
config: info
connection: info
dubbo: info
file: info
filter: debug
grpc: info
hc: info
health_checker: info
http: info
http2: info
hystrix: info
lua: info
main: info
misc: info
mongo: info
quic: info
pool: info
rbac: info
redis: info
router: info
runtime: info
stats: info
secret: info
tap: info
testing: info
thrift: info
tracing: info
upstream: info

You can set log levels of "trace, debug, info, warning, error, critical, off" on the global state.

curl -X POST localhost:8001/logging?level=debug

Alternatively, you can set the level of just a specific logger with a format similar to the below. This one changes just the logger for the filters.

curl -X POST localhost:8001/logging?filter=debug