Log
This is the config for event logs, which is optional and can not be reloaded. If set, the Root Value below must reside in the main conf file.
Root Value
The value could be a simple string, which is the driver name, such as
discard
drop the logs. This is the default.
journal
send logs to journald directly.
syslog
send logs to syslogd directly.
stdout
send logs to stdout.
Added in version 0.3.5.
In such case, a default driver is used as default log config for all loggers.
The value could be a map, with the following keys:
default
optional, type: log config
Set default log config for loggers with no explicit config.
default: discard
syslog
optional, type: syslog
Set default log config for loggers with no explicit config.
default: not set
Added in version 0.3.7.
fluentd
optional, type: fluentd
Set default log config for loggers with no explicit config.
default: not set
Added in version 0.3.7.
task
optional, type: log config
Set log config for task loggers.
default: not set
Log Config Value
The detailed log config may be a simple driver name, or a map, with the following keys:
journal
optional, type: map
Use journal log driver. An empty map should be used, as no keys are defined by now.
syslog
optional, type: syslog
Use syslog log driver.
fluentd
optional, type: fluentd
Use fluentd log driver.
async_channel_size
optional, type: usize
Set the internal async channel size.
default: 4096
async_thread_number
optional, type: usize
Set the number of async threads.
This has no effect on discard and journal log driver.
default: 1
io_error_sampling_offset
optional, type: usize, max: 16
The logger may encounter io error, we should report it anyhow. We will log this error every 2^n times, where n can be set here.
This has no effect on discard and journal log driver.
default: 10
Note
The discard driver has no config options, so it doesn’t has a corresponding map field.