[CentOS] Systemd debug logging turned on in CentOS 7

[Valeri Galtsev]

On Tue, February 28, 2017 9:22 am, Rob DeSanno wrote:
> Last time I saw it, I had just upgraded my CentOS 7 box with the
> 3.10.0-514 kernel and it rebooted already configured into debug mode. Not
> sure if this is a “feature” of the newer kernels or not but glad to
> see that i’m not the only one who had noticed this.
>
> # awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg
> 0 : CentOS Linux (3.10.0-514.6.2.el7.x86_64) 7 (Core)
> 1 : CentOS Linux (3.10.0-514.6.2.el7.x86_64) 7 (Core) with debugging
> 2 : CentOS Linux (0-rescue-7b37bcbe36eb420fb6426976c41b0aaf) 7 (Core)
> 3 : CentOS Linux (0-rescue-7b37bcbe36eb420fb6426976c41b0aaf) 7 (Core) with
> debugging

I am not certain if there is real harm to have kernel with all debug stuff
running on production machines. Probably no harm security wise, the only
unpleasant stuff is: you really would prefer to run as slim kernel as
possible on production systems. If I'm wrong about "no harm", somebody
chime in, I then will be really eager to address it on my boxes.

Valeri

>
> On Feb 27, 2017, 8:40 PM -0500, Chris Adams <linux at cmadams.net>, wrote:
>> Once upon a time, Thomas Eriksson <thomas.eriksson at slac.stanford.edu>
>> said:
>> > I noticed that some, but not all, of my CentOS 7 machines have these
>> > kernel parameters for turning on systemd debug level logging added to
>> > the grub.cfg file.
>>
>> Yep, for each of the installed kernels, I have two GRUB entries: one
>> with and one without debugging. It seems that when I install a new
>> kernel, the debugging entry gets the "default" choice.
>>
>> I don't know what's adding them though.
>> --
>> Chris Adams <linux at cmadams.net
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++++++++++++++++++++++++++++++++++++++++
Valeri Galtsev
Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
Phone: 773-702-4247
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