使用rsyslog进行Python日志记录 [英] Python logging with rsyslog

问题描述

我继承了以下python文件:

I've inherited the following python file:

import logging
from logging.handlers import SysLogHandler

class Logger(object):

  # Return a logging instance used throughout the library
  def __init__(self):
    self.logger = logging.getLogger('my_daemon')

  # Log an info message
  def info(self, message, *args, **kwargs):
    self.__log(logging.INFO, message, *args, **kwargs)

  # Configure the logger to log to syslog
  def log_to_syslog(self):
    formatter = logging.Formatter('my_daemon: [%(levelname)s] %(message)s')

    handler = SysLogHandler(address='/dev/log', facility=SysLogHandler.LOG_DAEMON)
    handler.setFormatter(formatter)

    self.logger.addHandler(handler)
    self.logger.setLevel(logging.INFO)

我看到init方法正在寻找一个名为 my_daemon 的记录器，该记录器在系统上找不到任何位置.我必须手动创建文件吗?如果可以，我应该将其放在哪里?

I see that the init method looks for a logger called my_daemon, which I can't find anywhere on my system. Do I have to manually create the file and if so where should I put it?

此外，log_to_syslog似乎在监听套接字/dev/log，当我运行sudo lsof /dev/log时，我得到以下信息:

Also, log_to_syslog appears to listen to socket /dev/log, and when I run sudo lsof /dev/log I get the following:

[vagrant@server]$ sudo lsof /dev/log
COMMAND  PID USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
rsyslogd 989 root    0u  unix 0xffff880037a880c0      0t0 8099 /dev/log

当我查看/etc/rsyslog.conf时，会看到以下内容:

When I look at /etc/rsyslog.conf I see the following:

# rsyslog v5 configuration file

# Log anything (except mail) of level info or higher.
# Don't log private authentication messages!
*.info;mail.none;authpriv.none;cron.none                /var/log/messages

所以我在这里有点迷路了.我的init函数似乎正在指示python使用名为 my_daemon 的日志文件，该文件在任何地方都找不到，并且/etc/rsyslog.conf似乎正在告诉机器使用/var/log/消息，其中不包含我的应用程序中的任何日志.

So I'm a bit lost here. My init function seems to be instructing python to use a logfile called my_daemon, which I can't find anywhere, and /etc/rsyslog.conf seems to be telling the machine to use /var/log/messages, which does not contain any logs from my app.

更新:这是我尝试记录消息的方式

Update: here's how I'm trying to log messages

import os
from logger import Logger

class Server(object):

  def __init__(self, options):
    self.logger = Logger()

  def write(self, data):
    self.logger.info('Received new data from controller, applying')
    print 'hello'

server.py中的write方法确实在屏幕上显示了"hello"，所以我知道我们已经接近了，只是记录器没有达到我的期望

The write method from server.py does print 'hello' to the screen so I know we're getting close, it's just the logger that's not doing what I would expect

推荐答案

my_daemon不是日志文件-它只是开发人员指定的名称，指示应用程序中的区域".请参阅此有关什么是记录器的信息.

my_daemon is not a log file - it is just a developer-specified name indicating an "area" in an application. See this information on what loggers are.

log_to_syslog没有在套接字上侦听-rsyslog守护程序正在这样做.此外，我看不到log_to_syslog的名称-是吗?如果未调用，则可以解释为什么在系统日志中看不到任何消息.

The log_to_syslog is not listening on a socket - the rsyslog daemon is doing that. Also, I don't see where log_to_syslog is called - is it? If it isn't called, that would explain why no messages are being seen in the syslog.

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