The reason why I noticed was that telegraf was reporting context related issues even with selinux disabled. That’s when I noticed all of the debugging lines in dmesg as well as debug mode enabled in /proc/cmdline.
On Feb 28, 2017, 10:49 AM -0500, Valeri Galtsev <galtsev@xxxxxxxxxxxxxxxxx>, wrote:
>
> 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@xxxxxxxxxxx>, wrote:
> > > Once upon a time, Thomas Eriksson <thomas.eriksson@xxxxxxxxxxxxxxxxx
> > > 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@xxxxxxxxxxx
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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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