python logging 设置

logging 日志需求

(1) 设置LEVEL

(2) 设置日志输出包含文件名，函数名，行数等．

(3) 设置日志对应的输出时间

(4) 设置日志追加的日志文件

(5) 限定日志文件的大小，若超过，则备份成新文件，新文件个数限定为１

代码如下：

import logging.handlers


# Init logging
LOG = logging.getLogger('node-exporter')
# Set logging level
LOG.setLevel(logging.DEBUG)

# Set output format for logging
fmt = '%(asctime)s %(filename)s [func:%(funcName)s()] [line:%(lineno)d] ' \
      '%(levelname)s %(message)s'
datefmt = '%a, %d %b %Y %H:%M:%S'
log_fmt = logging.Formatter(fmt, datefmt)

# If expoerter.log size is greater than 50M, mv it as exporter.log.1,
#  and new log add to exporter.log.
handler = logging.handlers.RotatingFileHandler(
    '/var/log/node/exporter.log', maxBytes=52428800,
    backupCount=1)

# Add the handler
handler.setFormatter(log_fmt)
LOG.addHandler(handler)