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I am using ubunto 18.04, When i run redis-server on the terminal it says 

# oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
# Redis version=4.0.9, bits=64, commit=00000000, modified=0, pid=11260, just started
# Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf
# You requested maxclients of 10000 requiring at least 10032 max file descriptors.
# Server can't set maximum open files to 10032 because of OS error: Operation not permitted.
# Current maximum open files is 1022. maxclients has been reduced to 990 to compensate for low ulimit. If you need higher maxclients increase 'ulimit -n'.
# Creating Server TCP listening socket *:6379: bind: Address already in use

I tried to increase this limit before by running

ulimit -n 10240

But it resulted in following error

bash: ulimit: open files: cannot modify limit: Operation not permitted

Then I tried to lower its value by running ulimit -n 1022 and it surprisingly ran successfully and decreased that limit.

I then followed this answer, but after doing echo 800000 > /proc/sys/fs/file-max overrides the "file-max" file but do not actually change max file limit

$ ulimit -n 
1022

Here I found another related question and my case seem to be System C one. I tried doing the following.

1) I added the following lines in my /etc/security/limits.conf file.

* soft nofile 4096
* hard nofile 10240

2) Added the following line in /etc/ssh/sshd_config file

UsePAM=yes

3) Added the follwing in '/etc/pam.d/sshd' file

session    required   pam_limits.so

But still no effect. ulimit -n command still shows 1022.

Rui F Ribeiro
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M. Habib
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  • This question also seems informative but is of no use. I am unable to update my per process file limit. – M. Habib May 28 '18 at 03:18
  • (1) Have you read documentation on ulimit?  Like the part about not being able to increase the hard limit, or raise the soft limit above the hard limit, unless you’re root?  You show a ulimit command with a $ prompt.  Are you running as root? (2) Did you reboot after editing the /etc files? (3) Did you try raising your limit (by typing ulimit -n followed by a number) after you edited the limits.conf file? … … … … … … … … … … … … … … … … … … … … … … … … … Please do not respond in comments; [edit] your question to make it clearer and more complete. – G-Man Says 'Reinstate Monica' May 28 '18 at 03:33

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