Lab 9-Lesson 6-Managing Kernel Modules (Activity 6-6)(1)-1
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Lab # 9
DCOM 224
Advanced Linux Administration
Lesson 6 Activity 6-6
Name ___Maurice Littlejohn_____________________________
Monitoring Kernel Modules
BEFORE YOU BEGIN
You are logged in to the CLI as your student account. Previously, you installed a USB
Bluetooth driver module
in the kernel.
SCENARIO
Now
that you installed the USB Bluetooth module, you want to make sure it was successfully loaded by the
kernel and that there are no errors. You also want to
identify your kernel version details in case you need to
reference it during troubleshooting.
1.
Enter
cat /proc/version
and use the result to answer the following questions.
SHOW A SCREENSHOT
What is your Linux version?
Ans
:
__
3.10.0-1160.11.1.el7.x86_64 _________________________________
When was the kernel last compiled?
Ans
:
__
Fri Dec 18 16:34:56 UTC 2020 _________________________________
What version of the GCC is your kernel running?
Ans
: __
4.8.5 20150623 (Red Hat 4.8.5-44) (GCC) _________________
The above information will be useful by validating the kernel version and related information can
help diagnose issues that apply to specific versions, such as incompatible software.
2.
Examine the kernel message buffer.
a)
The dmesg command is used to print or control the kernel ring buffer. To get additional
information about the command enter
dmesg -h
Note
the
different
log
facilities
and
supported
log
levels
available.
Examples
include
warn
,
err
,
notice
,
etc.
What 8 supported log facilities are available:
kern - kernel messages
user - random user-level messages
1
Lab # 9
DCOM 224
Advanced Linux Administration
Lesson 6 Activity 6-6
mail - mail system
daemon - system daemons
auth - security/authorization messages
syslog - messages generated internally by syslogd
lpr - line printer subsystem
news - network news subsystem
b)
Enter
dmesg -H
c)
Verify that you can navigate through many pages of kernel messages. Note that you can search
for strings using /string.
d)
Answer the following questions:
What is the Linux version listed in dmesg (/Linux version)? __
3.10.0-1160.11.1.el7.x86_64
_____________
How many cpus are allowed (/smpboot: Allowing)? 1 CPU
___________________________________
What mode is SELinux in (/SELinux)? _permissive mode
__________________________________________
What kind of cpu is cpu0 (/smpboot: CPU0)? _
Intel(R) Pentium(R) CPU 6405U @ 2.40GHz
_______________________________________
Not all of the information here will be useful to you, so you'll need to filter what
you're looking for.
e)
Press
q
.
3.
Filter the kernel message buffer for more useful messages.
a)
To display the kernel messages in human readable form for all log entries of log level
“warn” enter
dmesg -H
-l
warn
Note: use lowercase L for l… not a 1!
SHOW A SCREENSHOT
2
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