Lab 2.1 Can’t delete mycgroup.

Dumb question. But after doing the lab I’m unable to clean up and delete the cgroup that was created. I’m using the LF pre-built Ubuntu 18.04 on Vmware Workstation 15 Player. I’ve completed the lab successfully, but now I get this.
student@ubuntu:/sys/fs/cgroup/freezer$ ll total 0 dr-xr-xr-x 4 root root 0 Sep 8 07:45 ./ drwxr-xr-x 15 root root 380 Sep 8 07:17 ../ -rw-r--r-- 1 root root 0 Sep 8 07:44 cgroup.clone_children -rw-r--r-- 1 root root 0 Sep 8 09:40 cgroup.procs -r--r--r-- 1 root root 0 Sep 8 07:44 cgroup.sane_behavior drwxr-xr-x 2 root root 0 Sep 8 07:45 mycgroup/ -rw-r--r-- 1 root root 0 Sep 8 07:44 notify_on_release -rw-r--r-- 1 root root 0 Sep 8 07:44 release_agent -rw-r--r-- 1 root root 0 Sep 8 07:44 tasks drwxr-xr-x 5 root root 0 Sep 8 07:44 user/ student@ubuntu:/sys/fs/cgroup/freezer$ sudo rm -r mycgroup rm: cannot remove 'mycgroup/cgroup.procs': Operation not permitted rm: cannot remove 'mycgroup/freezer.self_freezing': Operation not permitted rm: cannot remove 'mycgroup/tasks': Operation not permitted rm: cannot remove 'mycgroup/freezer.parent_freezing': Operation not permitted rm: cannot remove 'mycgroup/freezer.state': Operation not permitted rm: cannot remove 'mycgroup/notify_on_release': Operation not permitted rm: cannot remove 'mycgroup/cgroup.clone_children': Operation not permitted student@ubuntu:/sys/fs/cgroup/freezer$
How do you clean up after this lab? Thanks.
Comments
-
Hi @ldt,
Where you able to successfully thaw the process as described by the lab guide? After successfully freezing and thawing that second terminal, where you able to terminate the terminal's process?
Ensure that no process is managed by any of the files inmycgroup/
, specifically ensure thatmycgroup/tasks
is empty, while all other files should be empty or include a0
.
Then try:student@ubuntu:/sys/fs/cgroup/freezer$ sudo cd mycgroup/ student@ubuntu:/sys/fs/cgroup/freezer/mycgroup$ sudo rm * student@ubuntu:/sys/fs/cgroup/freezer/mycgroup$ sudo cd .. student@ubuntu:/sys/fs/cgroup/freezer$ sudo rmdir mycgroup
If unsuccessful, try adding
-f
tosudo rm -f *
.Regards,
-Chris0 -
Hi @chrispokorni,
Thanks for your help. As I expected, after shutting down and restarting Ubuntu, mycgroup was gone. It is not permanent. But I was sure this was the answer to my problem since I had not killed the second terminal process. So I have repeated the lab and I am still unable to delete mycgroup.
student@ubuntu:/sys/fs/cgroup/freezer$ sudo mkdir mycgroup student@ubuntu:/sys/fs/cgroup/freezer$ cd mycgroup student@ubuntu:/sys/fs/cgroup/freezer/mycgroup$ ls cgroup.clone_children cgroup.procs freezer.parent_freezing freezer.self_freezing freezer.state notify_on_release tasks student@ubuntu:/sys/fs/cgroup/freezer/mycgroup$ cat tasks student@ubuntu:/sys/fs/cgroup/freezer/mycgroup$ ps -ef |grep bash student 3143 3134 0 08:47 pts/0 00:00:00 bash student 3356 3143 0 08:50 pts/0 00:00:00 grep --color=auto bash (open a new terminal) student@ubuntu:/sys/fs/cgroup/freezer/mycgroup$ ps -ef |grep bash student 3143 3134 0 08:47 pts/0 00:00:00 bash student 3368 3134 0 08:50 pts/1 00:00:00 bash student 3377 3143 0 08:50 pts/0 00:00:00 grep --color=auto bash student@ubuntu:/sys/fs/cgroup/freezer/mycgroup$ cat tasks student@ubuntu:/sys/fs/cgroup/freezer/mycgroup$ sudo sh -c "echo 3368 >> tasks" student@ubuntu:/sys/fs/cgroup/freezer/mycgroup$ cat tasks 3368 student@ubuntu:/sys/fs/cgroup/freezer/mycgroup$ sudo sh -c "echo FROZEN > freezer.state" (teminal 3368 is frozen) student@ubuntu:/sys/fs/cgroup/freezer/mycgroup$ sudo sh -c "echo THAWED > freezer.state" (teminal 3368 is thawed) student@ubuntu:/sys/fs/cgroup/freezer/mycgroup$ sudo kill -9 3368 student@ubuntu:/sys/fs/cgroup/freezer/mycgroup$ ps -ef |grep bash student 3143 3134 0 08:47 pts/0 00:00:00 bash student 3422 3143 0 08:55 pts/0 00:00:00 grep --color=auto bash student@ubuntu:/sys/fs/cgroup/freezer/mycgroup$ cat tasks student@ubuntu:/sys/fs/cgroup/freezer/mycgroup$ cat cgroup.clone_children 0 student@ubuntu:/sys/fs/cgroup/freezer/mycgroup$ cat cgroup.procs student@ubuntu:/sys/fs/cgroup/freezer/mycgroup$ cat freezer.parent_freezing 0 student@ubuntu:/sys/fs/cgroup/freezer/mycgroup$ cat freezer.self_freezing 0 student@ubuntu:/sys/fs/cgroup/freezer/mycgroup$ cat freezer.state THAWED student@ubuntu:/sys/fs/cgroup/freezer/mycgroup$ cat notify_on_release 0 student@ubuntu:/sys/fs/cgroup/freezer/mycgroup$ sudo rm * rm: cannot remove 'cgroup.clone_children': Operation not permitted rm: cannot remove 'cgroup.procs': Operation not permitted rm: cannot remove 'freezer.parent_freezing': Operation not permitted rm: cannot remove 'freezer.self_freezing': Operation not permitted rm: cannot remove 'freezer.state': Operation not permitted rm: cannot remove 'notify_on_release': Operation not permitted rm: cannot remove 'tasks': Operation not permitted student@ubuntu:/sys/fs/cgroup/freezer/mycgroup$ sudo rm -f * rm: cannot remove 'cgroup.clone_children': Operation not permitted rm: cannot remove 'cgroup.procs': Operation not permitted rm: cannot remove 'freezer.parent_freezing': Operation not permitted rm: cannot remove 'freezer.self_freezing': Operation not permitted rm: cannot remove 'freezer.state': Operation not permitted rm: cannot remove 'notify_on_release': Operation not permitted rm: cannot remove 'tasks': Operation not permitted student@ubuntu:/sys/fs/cgroup/freezer/mycgroup$
For some reason I'm not getting the same result you do.
Thanks,
ldt0 -
Can you try to only remove the mycgroup/ directory after you terminated the second shell process, skipping commands from lines (1-3)? Similar to this:
student@ubuntu:~$ sudo rmdir /sys/fs/cgroup/freezer/mycgroup/
Regards,
-Chris0 -
OK. So
rmdir
works butrm *
doesn't.student@ubuntu:/sys/fs/cgroup/freezer$ sudo mkdir mycgroup student@ubuntu:/sys/fs/cgroup/freezer$ cd mycgroup student@ubuntu:/sys/fs/cgroup/freezer/mycgroup$ sudo rm * rm: cannot remove 'cgroup.clone_children': Operation not permitted rm: cannot remove 'cgroup.procs': Operation not permitted rm: cannot remove 'freezer.parent_freezing': Operation not permitted rm: cannot remove 'freezer.self_freezing': Operation not permitted rm: cannot remove 'freezer.state': Operation not permitted rm: cannot remove 'notify_on_release': Operation not permitted rm: cannot remove 'tasks': Operation not permitted student@ubuntu:/sys/fs/cgroup/freezer/mycgroup$ sudo rm -f * rm: cannot remove 'cgroup.clone_children': Operation not permitted rm: cannot remove 'cgroup.procs': Operation not permitted rm: cannot remove 'freezer.parent_freezing': Operation not permitted rm: cannot remove 'freezer.self_freezing': Operation not permitted rm: cannot remove 'freezer.state': Operation not permitted rm: cannot remove 'notify_on_release': Operation not permitted rm: cannot remove 'tasks': Operation not permitted student@ubuntu:/sys/fs/cgroup/freezer/mycgroup$ cd .. student@ubuntu:/sys/fs/cgroup/freezer$ sudo rmdir mycgroup student@ubuntu:/sys/fs/cgroup/freezer$ ll total 0 dr-xr-xr-x 3 root root 0 Sep 11 14:14 ./ drwxr-xr-x 15 root root 380 Sep 11 14:11 ../ -rw-r--r-- 1 root root 0 Sep 11 14:13 cgroup.clone_children -rw-r--r-- 1 root root 0 Sep 11 14:14 cgroup.procs -r--r--r-- 1 root root 0 Sep 11 14:13 cgroup.sane_behavior -rw-r--r-- 1 root root 0 Sep 11 14:13 notify_on_release -rw-r--r-- 1 root root 0 Sep 11 14:13 release_agent -rw-r--r-- 1 root root 0 Sep 11 14:13 tasks drwxr-xr-x 5 root root 0 Sep 11 14:13 user/ student@ubuntu:/sys/fs/cgroup/freezer$
I didn't even do the lab exercise here. I just created the directory and then tried to delete it. I was surprised first of all to find that
mkdir
not only creates a directory, but some how mysteriously creates content in it as well. Just as mysterious is that it can't be deleted in the normal way. I suppose that only seems strange to a novice, but at least I have a working solution to the problem. Thanks for your help.
ldt0
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