linux - docker journald 日志记录驱动程序也会导致大量日志记录到/var/log/syslog 和/var/log/kern.log

Question

我目前将 deamon docker 的 logging_driver 配置为写入 journald，以便使用来自 kubernetes pod 的 fluentd 解析它们。在节点端，我有一个使用以下默认配置运行的 rsyslog:

#  Default rules for rsyslog.
#
#           For more information see rsyslog.conf(5) and /etc/rsyslog.conf

#
# First some standard log files.  Log by facility.
#
auth,authpriv.*         /var/log/auth.log
*.*;auth,authpriv.none      -/var/log/syslog
#cron.*             /var/log/cron.log
#daemon.*           -/var/log/daemon.log
kern.*              -/var/log/kern.log
#lpr.*              -/var/log/lpr.log
mail.*              -/var/log/mail.log
#user.*             -/var/log/user.log

#
# Logging for the mail system.  Split it up so that
# it is easy to write scripts to parse these files.
#
#mail.info          -/var/log/mail.info
#mail.warn          -/var/log/mail.warn
mail.err            /var/log/mail.err

#
# Logging for INN news system.
#
news.crit           /var/log/news/news.crit
news.err            /var/log/news/news.err
news.notice         -/var/log/news/news.notice

#
# Some "catch-all" log files.
#
#*.=debug;\
#   auth,authpriv.none;\
#   news.none;mail.none -/var/log/debug
#*.=info;*.=notice;*.=warn;\
#   auth,authpriv.none;\
#   cron,daemon.none;\
#   mail,news.none      -/var/log/messages

#
# Emergencies are sent to everybody logged in.
#
*.emerg                                :omusrmsg:*

#
# I like to have messages displayed on the console, but only on a virtual
# console I usually leave idle.
#
#daemon,mail.*;\
#   news.=crit;news.=err;news.=notice;\
#   *.=debug;*.=info;\
#   *.=notice;*.=warn   /dev/tty8

# The named pipe /dev/xconsole is for the `xconsole' utility.  To use it,
# you must invoke `xconsole' with the `-file' option:
#
#    $ xconsole -file /dev/xconsole [...]
#
# NOTE: adjust the list below, or you'll go crazy if you have a reasonably
#      busy site..
#
daemon.*;mail.*;\
    news.err;\
    *.=debug;*.=info;\
    *.=notice;*.=warn   |/dev/xconsole

发生的事情是，所有进入日志的日志记录也被放入 syslog 和 kern.log 中。由于在 kubernetes 节点和控制平面内运行了大量容器，我想尽量减少几个位置的指数日志记录，除了将它们放入日志之外，已经保存到 EFK 日志系统中。有没有人遇到同样的问题？我怎样才能避免这种情况？

Answer 1

默认情况下，journald 将日志转发到 syslog。

您可以通过编辑 /etc/systemd/journald.conf 和设置来关闭它:

ForwardToSyslog=no

然后重启服务:

systemctl restart systemd-journald