Logging is a vital part of system code, enabling the analysis and detection of runtime problems.
Logging in Fabric is based on the standard Go logging package, github.com/op/go-logging. The logging mechanism provides severity-based control of logs and pretty-printing decoration of messages. The logging levels are defined in decreasing order of severity, as follows:
CRITICAL | ERROR | WARNING | NOTICE | INFO | DEBUG
The log messages are combined from all components and written into the standard error file (stderr). Logging can be controlled by the configuration of peers and modules, as well as in the code of the chaincode.
The default configuration of peer logging is set to the level INFO, but this level can be controlled in the following ways:
- A command line option logging level. This option overrides default configurations, shown as follows:
peer node start --logging-level=error
Note that any module or chaincode can be configured through the command line option,...