How to set ulimit in ubuntu linux? getting sudo: ulimit: command not found error

I ran ulimit -n and it is current showing as 1024. I want to increase my file limit from 1024 to 4084. So, i tried running the following command

sudo ulimit -n 2048

but i get the following error

sudo: ulimit: command not found

How to increase the file limit from 1024 to 4084. Any help will be appreciated.

2 answers, votes, 18392 views

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asked by Visitor
2 years 1 week ago

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2 Answers

If you are root, execute the command below
ulimit -SHn 65535
If you want to set it permanently, especially for a particular user, change the file /etc/security/limits.conf to have the following lines (assume user = www-data)
E.g.
www-data hard nofile 65535 www-data soft nofile 65535
And make sure uncomment pam_limits.so from the different files under /etc/pam.d, e.g. sudo, login, sshd, ...
Finally restart your system
Source:

http://www.linuxask.com/questions/increase-the-maximum-number-of-open-files-file-descriptors

- Visitor 1 year 51 weeks ago

Answer

pam limits by default is not loaded in ubuntu. So run the following command in a terminal

sudo gedit /etc/pam.d/su

uncomment the following line

#session    required   pam_limits.so
to
session    required   pam_limits.so

save and close the editor.

Now run the following command in terminal

sudo gedit /etc/security/limits.conf

and add the following lines to the end of the file (before the line # End of file)
*       soft nofile   4084
*       hard nofile   4084

Now reboot the machine and run ulimit -a and see the open files limits are now updated. enjoy!!

answer by Visitor
2 years 1 week ago

Ubuntu Linux 8.04.3 - following these instructions accomplishes nothing

- Visitor 22 weeks 6 days ago

I can confirm that reboot is not required - just a logout/login.

- Visitor 49 weeks 4 days ago

I can confirm that reboot is not required - just a logout/login.

- Visitor 49 weeks 4 days ago

Still not working for me..... :(
I have followed complete instructions as you detailed but not working.

- Visitor 50 weeks 12 hours ago

reboot may not be required, just logout and login.

- Visitor 1 year 26 weeks ago

Answer

sudo -i <enter>

Then you will be able to use ulimit as root.

answer by Visitor
15 min 48 sec ago

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