CentOS - Feb 2017 - Systemd debug logging turned on in CentOS 7

Hi,

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.

  systemd.log_level=debug systemd.log_target=kmsg

The parameters are *not* in the /etc/default/grub file, so if I rebuild
grub.cfg with grub2-mkconfig, they disappear.

I am a bit puzzled over how they got introduced.
Has anyone else seen this?

thanks,

	Thomas

Oh wow, I was coming across this in my env last week and thought that it was
something with the way they were kickstarted. You are not alone!

On Feb 27, 2017, 5:35 PM -0500, Thomas Eriksson <thomas.eriksson at
slac.stanford.edu>, wrote:
> Hi,
>
> 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.
>
> systemd.log_level=debug systemd.log_target=kmsg
>
> The parameters are *not* in the /etc/default/grub file, so if I rebuild
> grub.cfg with grub2-mkconfig, they disappear.
>
> I am a bit puzzled over how they got introduced.
> Has anyone else seen this?
>
> thanks,
>
> Thomas
>
>
>
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> https://lists.centos.org/mailman/listinfo/centos

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>

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

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
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> https://lists.centos.org/mailman/listinfo/centos