系统日志中充满了会话和切片消息

我安装了新的CentOS 7，并注意到我的/ var / log / messages文件中充满了这样的消息

Mar  6 08:40:01 myhostname systemd: Started Session 2043 of user root.
Mar  6 08:40:01 myhostname systemd: Starting Session 2043 of user root.
Mar  6 08:40:01 myhostname systemd: Created slice user-1001.slice.
Mar  6 08:40:01 myhostname systemd: Starting user-1001.slice.
Mar  6 08:40:01 myhostname systemd: Started Session 2042 of user userx.
Mar  6 08:40:01 myhostname systemd: Starting Session 2042 of user userx.
Mar  6 08:40:01 myhostname systemd: Started Session 2041 of user root.
Mar  6 08:40:01 myhostname systemd: Starting Session 2041 of user root.
Mar  6 08:40:31 myhostname systemd: Removed slice user-1001.slice.
Mar  6 08:40:31 myhostname systemd: Stopping user-1001.slice.
Mar  6 08:41:01 myhostname systemd: Created slice user-1001.slice.
Mar  6 08:41:01 myhostname systemd: Starting user-1001.slice.
Mar  6 08:41:01 myhostname systemd: Started Session 2044 of user userx.
Mar  6 08:41:01 myhostname systemd: Starting Session 2044 of user userx.
Mar  6 08:41:21 myhostname systemd: Removed slice user-1001.slice.
Mar  6 08:41:21 myhostname systemd: Stopping user-1001.slice.

这些都是什么意思，为什么它们在那里？如果这是正常的背景噪音，它们似乎是对资源的极大浪费，无法记录下来……

（此问题也在超级用户那里得到了回答）

这些是与片的创建和删除有关的消息，这些消息在systemd中用于对进程进行分组并管理其资源。

为什么默认情况下会记录它们，这使我不解，但我已经看到了两种禁用它们的方法：

1. 侵入性较小的方法是通过创建具有以下内容的/etc/rsyslog.d/ignore-systemd-session-slice.conf来过滤掉它们：

   if $programname == "systemd" and ($msg contains "Starting Session" or $msg contains "Started Session" or $msg contains "Created slice" or $msg contains "Starting user-" or $msg contains "Removed Slice" or $msg contains "Stopping user-") then stop
   

   然后重新启动rsyslogd systemctl restart rsyslog

2. 更广泛的方法是通过编辑将systemd日志记录级别设置得更高一些/etc/systemd/system.conf：

    #LogLevel=info
    LogLevel=notice
   

参考文献：

• https://access.redhat.com/solutions/1564823

• 我有更多但不能发布超过2个链接。万岁。

这些消息是正常现象，是预期的-用户每次登录都可以看到这些消息

要在/ var / log / messages中禁止显示这些日志条目，请使用rsyslog创建一个丢弃过滤器，例如，运行以下命令：

echo 'if $programname == "systemd" and ($msg contains "Starting Session" or $msg contains "Started Session" or $msg contains "Created slice" or $msg contains "Starting user-" or $msg contains "Starting User Slice of" or $msg contains "Removed session" or $msg contains "Removed slice User Slice of" or $msg contains "Stopping User Slice of") then stop' >/etc/rsyslog.d/ignore-systemd-session-slice.conf

然后重新启动rsyslog服务

systemctl restart rsyslog

https://access.redhat.com/solutions/1564823