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@kicp.uchicago.edu, 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 âfeatureâ of the newer kernels or not but glad to see that iâm 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@cmadams.net, wrote:
Once upon a time, Thomas Eriksson <thomas.eriksson@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.
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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 ++++++++++++++++++++++++++++++++++++++++ _______________________________________________ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos