Possible Chapter 14 Erata

Just going through Chapter 14, and noticed that under the section I/O Monitoring and Tuning...iostat there seems to be a slight mismatch between the explanatory text and the first screen shot.
The explanatory text states:
After a brief summary of CPU utilization, I/O statistics are given: tps (I/O transactions per second; logical requests can be merged into one actual request), blocks read and written per unit time, where the blocks are generally sectors of 512 bytes; and the total blocks read and written.
However, the matching screenshot displays the last 4 columns of output in kB, rather than blocks. This matches the output I see when I run iostat. Effectively, there doesn't seem to be any difference between this output and that generated when running iostat -k
.
This also suggests that this subsequent text on the same page also could do with an update -
A somewhat different display is generated by giving the -k option, which shows results in KB instead of blocks.
Looking through the man page for iostat, this states that the output is in blocks if no parameters are passed to iostat as well - which suggests that behavior has changed over time.
I'm running through this on CentOS 7.
Cheers
Comments
-
try:
POSIXLY_CORRECT=1 iostat
and you will get in blocks. I don't know when the behaviour changed. on RHEL/CentOS 8 the man page does say it will be in KB and not blocks (and 1 KB=2 Blocks) unless you set the above environment variable (to any value). We'll think about how to reword for the future, it is a little more to fix than a typo, and the results are kind of obvious no matter what.
Thanks
2 -
Cool, thanks for having a look - tried running it as you suggested and am seeing the output in blocks as you mentioned.
Cheers
0 -
LFS 201 - Lab Exercise 14.1 - I am using CentOS 8
Seems like the distro does not have bonnie++. I tried to do an install as well :
[mc75@localhost /]$ sudo yum install bonnie++
Last metadata expiration check: 0:00:57 ago on Wed 01 Jul 2020 05:51:08 PM EDT.
No match for argument: bonnie++
Error: Unable to find a match: bonnie++0 -
LFS 201 - Lab Exercise 14.2 - I am using CentOS 8.
My fs_mark install failed because of glibc-static not being present. Since I could not locate it, I looked up /etc/yum.repos.d/CentOS-PowerTools.repo and found enabled set as 0.
[PowerTools]
name=CentOS-$releasever - PowerTools
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=PowerTools&infra=$infrabaseurl=http://mirror.centos.org/$contentdir/$releasever/PowerTools/$basearch/os/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficialI am not sure if I am to try and update enabled to 1 in the repo itself. The Assignment mentioned that there is a copy of the file with enabled =1 in the Solutions section of the course. I could not find that. Am I missing any step as part of this assignment ?
0 -
Hi @moulinath ,
It's easier to install these packages from the EPEL repo. So you install the associated package (for configuring the EPEL repo), and you are ready to search and install them.
Regards,
Luis.0 -
How do I do that ?
0 -
There's a number of questions here.
First, to install EPEL, you can look up the epel web page and you will see on it instructions for how to install:
https://fedoraproject.org/wiki/EPEL
(You might also consider adding the rpmfusion repos at some point, for other packages but sometimes there are more conflicts)
As far as turning on PowerTools repo, yes, absolutely turn it on. It will not cause problems
0 -
I tried sudo yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm as well as
sudo yum install epel-releaseIn both cases, I am getting :
CentOS-8 - AppStream 0.0 B/s | 0 B 00:00
Failed to download metadata for repo 'AppStream'
Error: Failed to download metadata for repo 'AppStream'0 -
This error has nothing directly to do with EPEL as it says you were not able to connect to the "AppStream" repo which is CentOS. It's probably easier to directly download the EPEL rpm and then install locally. You can get it from the fedora web site easy enough, or you can get it from https://training.linuxfoundation.org/cm/LFS201 , which you should have encountered in the intro chapter together with the username and password to get in. Download from there and then do:
sudo rpm -Uvh epel-release-8*.rpm
(BTW, I would recommend getting used to using "dnf" instead of "yum" on CentOS 8)
I don't generally like downloading and installing rpms directly from a URL, but it is a nifty capability.
If you had run ./ready-for.sh --install LFS201 from the same location it should have installed the epel repo for you already!
0 -
Hi @moulinath ,
I had a similar issue a couple of weeks ago when trying to install software; in my case it was the source repos that were not responding. In this case, ensure that "baseurl" is uncommented in /etc/yum.repos.d/CentOS-AppStream.repo , as shown in:
https://forums.centos.org/viewtopic.php?t=71742
Many regards,
Luis.0
Categories
- All Categories
- 242 LFX Mentorship
- 242 LFX Mentorship: Linux Kernel
- 815 Linux Foundation IT Professional Programs
- 366 Cloud Engineer IT Professional Program
- 165 Advanced Cloud Engineer IT Professional Program
- 83 DevOps Engineer IT Professional Program
- 131 Cloud Native Developer IT Professional Program
- 142 Express Training Courses & Microlearning
- 119 Express Courses - Discussion Forum
- Microlearning - Discussion Forum
- 6.6K Training Courses
- 40 LFC110 Class Forum - Discontinued
- 72 LFC131 Class Forum
- 49 LFD102 Class Forum
- 234 LFD103 Class Forum
- 16 LFD110 Class Forum
- 31 LFD121 Class Forum
- LFD123 Class Forum
- LFD125 Class Forum
- 16 LFD133 Class Forum
- 6 LFD134 Class Forum
- 17 LFD137 Class Forum
- 70 LFD201 Class Forum
- 3 LFD210 Class Forum
- 2 LFD210-CN Class Forum
- 2 LFD213 Class Forum - Discontinued
- 128 LFD232 Class Forum - Discontinued
- 2 LFD233 Class Forum
- 2 LFD237 Class Forum
- 24 LFD254 Class Forum
- 680 LFD259 Class Forum
- 109 LFD272 Class Forum
- 4 LFD272-JP クラス フォーラム
- 10 LFD273 Class Forum
- 233 LFS101 Class Forum
- 1 LFS111 Class Forum
- 2 LFS112 Class Forum
- 1 LFS116 Class Forum
- 3 LFS118 Class Forum
- LFS120 Class Forum
- 2 LFS142 Class Forum
- 2 LFS144 Class Forum
- 3 LFS145 Class Forum
- 1 LFS146 Class Forum
- 15 LFS148 Class Forum
- 8 LFS151 Class Forum
- 1 LFS157 Class Forum
- 63 LFS158 Class Forum
- LFS158-JP クラス フォーラム
- 4 LFS162 Class Forum
- 1 LFS166 Class Forum
- 3 LFS167 Class Forum
- 1 LFS170 Class Forum
- 2 LFS171 Class Forum
- 2 LFS178 Class Forum
- 2 LFS180 Class Forum
- 1 LFS182 Class Forum
- 5 LFS183 Class Forum
- 30 LFS200 Class Forum
- 737 LFS201 Class Forum - Discontinued
- 2 LFS201-JP クラス フォーラム
- 17 LFS203 Class Forum
- 111 LFS207 Class Forum
- 1 LFS207-DE-Klassenforum
- LFS207-JP クラス フォーラム
- 302 LFS211 Class Forum
- 55 LFS216 Class Forum
- 53 LFS241 Class Forum
- 50 LFS242 Class Forum
- 37 LFS243 Class Forum
- 13 LFS244 Class Forum
- 1 LFS245 Class Forum
- LFS246 Class Forum
- LFS248 Class Forum
- 79 LFS250 Class Forum
- 2 LFS250-JP クラス フォーラム
- LFS251 Class Forum
- 143 LFS253 Class Forum
- LFS254 Class Forum
- LFS255 Class Forum
- 6 LFS256 Class Forum
- LFS257 Class Forum
- 1.2K LFS258 Class Forum
- 9 LFS258-JP クラス フォーラム
- 135 LFS260 Class Forum
- 151 LFS261 Class Forum
- 41 LFS262 Class Forum
- 82 LFS263 Class Forum - Discontinued
- 15 LFS264 Class Forum - Discontinued
- 11 LFS266 Class Forum - Discontinued
- 22 LFS267 Class Forum
- 25 LFS268 Class Forum
- 29 LFS269 Class Forum
- 7 LFS270 Class Forum
- 199 LFS272 Class Forum
- 1 LFS272-JP クラス フォーラム
- 2 LFS147 Class Forum
- LFS274 Class Forum
- 3 LFS281 Class Forum
- 2 LFW111 Class Forum
- 257 LFW211 Class Forum
- 176 LFW212 Class Forum
- 12 SKF100 Class Forum
- SKF200 Class Forum
- 2 SKF201 Class Forum
- 789 Hardware
- 199 Drivers
- 68 I/O Devices
- 37 Monitors
- 98 Multimedia
- 174 Networking
- 91 Printers & Scanners
- 83 Storage
- 753 Linux Distributions
- 82 Debian
- 67 Fedora
- 17 Linux Mint
- 13 Mageia
- 23 openSUSE
- 147 Red Hat Enterprise
- 31 Slackware
- 13 SUSE Enterprise
- 350 Ubuntu
- 464 Linux System Administration
- 39 Cloud Computing
- 70 Command Line/Scripting
- Github systems admin projects
- 91 Linux Security
- 78 Network Management
- 101 System Management
- 47 Web Management
- 69 Mobile Computing
- 17 Android
- 28 Development
- 1.2K New to Linux
- 1K Getting Started with Linux
- 365 Off Topic
- 113 Introductions
- 176 Small Talk
- 26 Study Material
- 521 Programming and Development
- 291 Kernel Development
- 212 Software Development
- 1.1K Software
- 263 Applications
- 180 Command Line
- 3 Compiling/Installing
- 988 Games
- 311 Installation
- 79 All In Program
- 79 All In Forum
Upcoming Training
-
August 20, 2018
Kubernetes Administration (LFS458)
-
August 20, 2018
Linux System Administration (LFS301)
-
August 27, 2018
Open Source Virtualization (LFS462)
-
August 27, 2018
Linux Kernel Debugging and Security (LFD440)