Lab 6.3, file permissions issue! First post/question!
Hi everyone! This is my first post and I feel like its a super simple one, in lab 6.3 I've created a file and changed perissions for a new user to be able to write to that file when logged into. However I keep getting "-sh: 1: cannot create /tmp/afile: Permission denied" when I try to echo a new line into the file or save a new line with nano. Any ideas?
These are the files permissions:
getfacl: Removing leading '/' from absolute path names
file: tmp/afile
owner: thomas
group: thomas
user::rw-
user:rocky:rw-
group::rw-
mask::rw-
other::rw-
Thank you!!
Answers
-
Hello, coincidentally, I am on the same lab, 6.3, and am experiencing the same issue.
I can read the file with vi editor, but cannot write to it.
Also, echo This is a new line >> /tmp/afile is getting a permission denied result.My commands are:
setfacl -m u:testuser:rw /tmp/afilegetfacl /tmp/afile
file: tmp/afile
owner: janderson
group: janderson
user::rw-
user:testuser:rw-
group::rw-
mask::rw-
other::---testuser@Ubuntoo2204:~$ cat /tmp/afile
This is a filetestuser@Ubuntoo2204:~$ echo This is a new line >> /tmp/afile
-bash: /tmp/afile: Permission denied1 -
For some permissions on /tmp, it's not possible to modify the file. So I created a subdirectory called "test" on /tmp, so it's /tmp/test. I moved the "afile" file to the new directory, /tmp/test. Did the test again and it worked.
Please confirm if the workaround works for you.
Regards,
Luis.0 -
Okay, my thought was that the /tmp directory was not allowing x(executable) for the 'other' permission.
On the /tmp directory, I changed the 'other' or 'world' permission from t(sticky)bit to x via chmod o=rwx /tmp. The original for o was rwt.
I can now write to the afile file in the /tmp directory.I put the t(sticky)bit back onto the /tmp directory for I don't want to change any global/system settings on the directory.
I tried adding the testuser to the facl on the /tmp directory with rwx, still unable to write to the afile file just using the facl feature by itself.
I moved the afile to my home directory. My home directory is allowing x for 'world'.
I added testuser to the facl with rw- on the afile and am able to read/write to it.
When I remove testuser from the facl, rw permission is denied as expected.I don't know if using a system directory is the best way to test the facl feature. But, I'm new to all of this, so I may be way off.
0 -
Hi @jma0770,
Okay, my thought was that the /tmp directory was not allowing x(executable) for the 'other' >permission.
On the /tmp directory, I changed the 'other' or 'world' permission from t(sticky)bit to x via chmod >o=rwx /tmp. The original for o was rwt.
I can now write to the afile file in the /tmp directory.That looks too messy.
So, this is what I did on Ubuntu 22.04 LTS and worked for me:
In window 1:
1.- echo This is a file > /tmp/afile
2.- mkdir /tmp/test
3.- mv /tmp/afile /tmp/test
4.- setfacl -m u:fool:rw /tmp/test/afileIn window 2 with user "fool":
1.- echo another line > /tmp/test/afile
==> That worked.
Regards,
Luis.1 -
@luisviveropena
That worked for me as well!1 -
@jma0770 that's nice!!
Regards,
Luis.0 -
@luisviveropena This worked thank you! And the reason it wasn't working before is due to the permissions in the /tmp directory as a whole?
1 -
Hi @tpcm ,
This worked thank you!
It's a pleasure!
And the reason it wasn't working before is due to the permissions in the /tmp directory as a whole?
Yep, it's about the Sticky Bit on /tmp.
Regards,
Luis.0 -
How are you guys using the second window, after sudo su - fool, to even GET to the first window/user's directory? I can't cd in and ls tells me the directory doesn't exist (which is right, because I didn't make a home/fool dir).
Realized that I needed to cd into the directory BEFORE sudo su , then ls lists "afile".
0 -
0
Categories
- All Categories
- 154 LFX Mentorship
- 154 LFX Mentorship: Linux Kernel
- 665 Linux Foundation IT Professional Programs
- 319 Cloud Engineer IT Professional Program
- 141 Advanced Cloud Engineer IT Professional Program
- 54 DevOps Engineer IT Professional Program
- 120 Cloud Native Developer IT Professional Program
- 91 Express Training Courses
- 91 Express Courses - Discussion Forum
- 5.4K Training Courses
- 19 LFC110 Class Forum - Discontinued
- 12 LFC131 Class Forum
- 32 LFD102 Class Forum
- 191 LFD103 Class Forum
- 9 LFD110 Class Forum
- 24 LFD121 Class Forum
- 14 LFD133 Class Forum
- 14 LFD137 Class Forum
- 62 LFD201 Class Forum
- 2 LFD210 Class Forum
- 1 LFD210-CN Class Forum
- 1 LFD213 Class Forum - Discontinued
- 127 LFD232 Class Forum - Discontinued
- LFD233 Class Forum
- LFD237 Class Forum
- 22 LFD254 Class Forum
- 644 LFD259 Class Forum
- 108 LFD272 Class Forum
- 1 LFD272-JP クラス フォーラム
- 7 LFD273 Class Forum
- 2 LFS101 Class Forum
- LFS112 Class Forum
- LFS116 Class Forum
- LFS118 Class Forum
- LFS142 Class Forum
- LFS144 Class Forum
- 2 LFS145 Class Forum
- LFS146 Class Forum
- LFS151 Class Forum
- LFS157 Class Forum
- LFS158 Class Forum
- LFS162 Class Forum
- LFS166 Class Forum
- LFS167 Class Forum
- LFS170 Class Forum
- LFS171 Class Forum
- LFS178 Class Forum
- LFS180 Class Forum
- LFS182 Class Forum
- LFS183 Class Forum
- 28 LFS200 Class Forum
- 735 LFS201 Class Forum - Discontinued
- 1 LFS201-JP クラス フォーラム
- 13 LFS203 Class Forum
- 98 LFS207 Class Forum
- 299 LFS211 Class Forum
- 54 LFS216 Class Forum
- 47 LFS241 Class Forum
- 41 LFS242 Class Forum
- 36 LFS243 Class Forum
- 12 LFS244 Class Forum
- LFS245 Class Forum
- 42 LFS250 Class Forum
- 1 LFS250-JP クラス フォーラム
- LFS251 Class Forum
- 141 LFS253 Class Forum
- LFS254 Class Forum
- LFS255 Class Forum
- 4 LFS256 Class Forum
- LFS257 Class Forum
- 1.2K LFS258 Class Forum
- 9 LFS258-JP クラス フォーラム
- 110 LFS260 Class Forum
- 147 LFS261 Class Forum
- 39 LFS262 Class Forum
- 82 LFS263 Class Forum - Discontinued
- 15 LFS264 Class Forum - Discontinued
- 11 LFS266 Class Forum - Discontinued
- 20 LFS267 Class Forum
- 18 LFS268 Class Forum
- 27 LFS269 Class Forum
- 198 LFS272 Class Forum
- 1 LFS272-JP クラス フォーラム
- LFS274 Class Forum
- 3 LFS281 Class Forum
- LFW111 Class Forum
- 254 LFW211 Class Forum
- 173 LFW212 Class Forum
- 9 SKF100 Class Forum
- SKF200 Class Forum
- 781 Hardware
- 198 Drivers
- 68 I/O Devices
- 37 Monitors
- 95 Multimedia
- 174 Networking
- 87 Printers & Scanners
- 83 Storage
- 742 Linux Distributions
- 80 Debian
- 66 Fedora
- 15 Linux Mint
- 13 Mageia
- 23 openSUSE
- 143 Red Hat Enterprise
- 31 Slackware
- 13 SUSE Enterprise
- 347 Ubuntu
- 459 Linux System Administration
- 39 Cloud Computing
- 69 Command Line/Scripting
- Github systems admin projects
- 89 Linux Security
- 77 Network Management
- 101 System Management
- 46 Web Management
- 51 Mobile Computing
- 17 Android
- 24 Development
- 1.2K New to Linux
- 1K Getting Started with Linux
- 357 Off Topic
- 109 Introductions
- 169 Small Talk
- 18 Study Material
- 504 Programming and Development
- 283 Kernel Development
- 203 Software Development
- 1.1K Software
- 210 Applications
- 180 Command Line
- 3 Compiling/Installing
- 398 Games
- 308 Installation
- 51 All In Program
- 51 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)