Lab 2.1 Freezer not exists (Solution)
Hello, if someone are using a distro where the freezer directory not exists, you can create it this way:
sudo mkdir /sys/fs/cgroup/freezer
sudo mount -t cgroup -ofreezer freezer /sys/fs/cgroup/freezer
That way no matter the distro you are using you can complete this Lab.
Comments
-
Thanks, this worked perfectly.
0 -
Thanks!!!
0 -
I know this is an older post and marked resolved, but I was wondering how/if it was intended to be persistent across restarts? The lab seems to imply that
/sys/fs/cgroup/freezer/
exists on installation.Is there a deb package that is missing and should be there?
0 -
You are correct, on the Ubuntu 20.04 LTS server the
.../cgroup/freezer/
directory exists. That is the recommended OS release as presented in lab exercise 1.1 of the lab guide.However, as the original post of this discussion suggests, that directory may not be available on all releases and/or distributions. For those scenarios, the suggested workaround may be applied.
Regards,
-Chris1 -
Thanks for your reply, @chrispokorni !! I know this was an aged thread, but still topical.
I apologize that I wasn't clear. Is there an Ubuntu package from other versions that would need applied to persist that filesystem setup? The work around does not persist between reboots for my version (22.04.x).
Thanks!
0 -
On Ubuntu 22.04 the
cgroups
behave differently, and the lab produces different results that are inconsistent with the ones from Ubuntu 20.04 (the recommended release/version for this course).Regards,
-Chris0 -
Hi,
I know Ubuntu 20.04 is the recommended release/version for this course, but since Control Group v2 has recently become the default in some distributions, I think it's useful to know how to modify the lab workflow to handle it, without adding the cgroup v1 workaround. So I tested some cgroup v2 approaches on Ubuntu 22.04.4 LTS (GNU/Linux 5.15.0-1051-kvm x86_64) and Fedora CoreOS 39.20240225.1.0 (Linux 6.7.5-200.fc39.x86_64). If any of the other students and forum moderators think it would be useful, I can share them here or in another post for further discussion.1 -
Following the "authoritative documentation" by the writer of cgroups v2 , you can adjust the lab as follows:
/sys/fs/cgroup is the root cgroup, freezer is not a subgroup, but each cgroup (except root) has cgroup.freeze file. There is also no "tasks", replaced by cgroup.procs
/sys/fs/cgroup$ sudo mkdir mycgroup
- mycgroup is now subgroup of root/sys/fs/cgroup/mycgroup$ sudo echo $PID > cgroup.procs
--$PID is now part of mycgroup/sys/fs/cgroup/mycgroup$ sudo echo 1 > cgroup.freeze
--$PID is now "FROZEN"/sys/fs/cgroup/mycgroup$ sudo echo 0 > cgroup.freeze
--$PID is now "THAWED"1 -
Thanks this was required for a default install of Ubuntu Oracular 24.10 as well.
1
Categories
- All Categories
- 167 LFX Mentorship
- 219 LFX Mentorship: Linux Kernel
- 801 Linux Foundation IT Professional Programs
- 358 Cloud Engineer IT Professional Program
- 180 Advanced Cloud Engineer IT Professional Program
- 83 DevOps Engineer IT Professional Program
- 149 Cloud Native Developer IT Professional Program
- 112 Express Training Courses
- 138 Express Courses - Discussion Forum
- 6.2K Training Courses
- 48 LFC110 Class Forum - Discontinued
- 17 LFC131 Class Forum
- 42 LFD102 Class Forum
- 227 LFD103 Class Forum
- 19 LFD110 Class Forum
- 39 LFD121 Class Forum
- 15 LFD133 Class Forum
- 7 LFD134 Class Forum
- 17 LFD137 Class Forum
- 63 LFD201 Class Forum
- 3 LFD210 Class Forum
- 5 LFD210-CN Class Forum
- 2 LFD213 Class Forum - Discontinued
- 128 LFD232 Class Forum - Discontinued
- 1 LFD233 Class Forum
- 2 LFD237 Class Forum
- 23 LFD254 Class Forum
- 697 LFD259 Class Forum
- 109 LFD272 Class Forum
- 3 LFD272-JP クラス フォーラム
- 10 LFD273 Class Forum
- 154 LFS101 Class Forum
- 1 LFS111 Class Forum
- 1 LFS112 Class Forum
- 1 LFS116 Class Forum
- 1 LFS118 Class Forum
- LFS120 Class Forum
- 7 LFS142 Class Forum
- 7 LFS144 Class Forum
- 3 LFS145 Class Forum
- 1 LFS146 Class Forum
- 3 LFS147 Class Forum
- 1 LFS148 Class Forum
- 15 LFS151 Class Forum
- 1 LFS157 Class Forum
- 34 LFS158 Class Forum
- 8 LFS162 Class Forum
- 1 LFS166 Class Forum
- 1 LFS167 Class Forum
- 3 LFS170 Class Forum
- 2 LFS171 Class Forum
- 1 LFS178 Class Forum
- 1 LFS180 Class Forum
- 1 LFS182 Class Forum
- 1 LFS183 Class Forum
- 29 LFS200 Class Forum
- 736 LFS201 Class Forum - Discontinued
- 2 LFS201-JP クラス フォーラム
- 14 LFS203 Class Forum
- 135 LFS207 Class Forum
- 1 LFS207-DE-Klassenforum
- 1 LFS207-JP クラス フォーラム
- 301 LFS211 Class Forum
- 55 LFS216 Class Forum
- 48 LFS241 Class Forum
- 48 LFS242 Class Forum
- 37 LFS243 Class Forum
- 15 LFS244 Class Forum
- LFS245 Class Forum
- LFS246 Class Forum
- 50 LFS250 Class Forum
- 1 LFS250-JP クラス フォーラム
- LFS251 Class Forum
- 155 LFS253 Class Forum
- LFS254 Class Forum
- LFS255 Class Forum
- 5 LFS256 Class Forum
- 1 LFS257 Class Forum
- 1.3K LFS258 Class Forum
- 10 LFS258-JP クラス フォーラム
- 122 LFS260 Class Forum
- 159 LFS261 Class Forum
- 42 LFS262 Class Forum
- 82 LFS263 Class Forum - Discontinued
- 15 LFS264 Class Forum - Discontinued
- 11 LFS266 Class Forum - Discontinued
- 20 LFS267 Class Forum
- 25 LFS268 Class Forum
- 31 LFS269 Class Forum
- 3 LFS270 Class Forum
- 199 LFS272 Class Forum
- 1 LFS272-JP クラス フォーラム
- LFS274 Class Forum
- 3 LFS281 Class Forum
- 10 LFW111 Class Forum
- 261 LFW211 Class Forum
- 182 LFW212 Class Forum
- 15 SKF100 Class Forum
- 1 SKF200 Class Forum
- 1 SKF201 Class Forum
- 782 Hardware
- 198 Drivers
- 68 I/O Devices
- 37 Monitors
- 96 Multimedia
- 174 Networking
- 91 Printers & Scanners
- 83 Storage
- 758 Linux Distributions
- 80 Debian
- 67 Fedora
- 15 Linux Mint
- 13 Mageia
- 23 openSUSE
- 143 Red Hat Enterprise
- 31 Slackware
- 13 SUSE Enterprise
- 348 Ubuntu
- 461 Linux System Administration
- 39 Cloud Computing
- 70 Command Line/Scripting
- Github systems admin projects
- 90 Linux Security
- 77 Network Management
- 101 System Management
- 46 Web Management
- 64 Mobile Computing
- 17 Android
- 34 Development
- 1.2K New to Linux
- 1K Getting Started with Linux
- 371 Off Topic
- 114 Introductions
- 174 Small Talk
- 19 Study Material
- 806 Programming and Development
- 304 Kernel Development
- 204 Software Development
- 1.8K Software
- 263 Applications
- 180 Command Line
- 3 Compiling/Installing
- 405 Games
- 309 Installation
- 97 All In Program
- 97 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)