In this post, we will see an interesting thing when we are not able to change the open files to unlimited in Linux.
I. Error Message
[root@ngelinux001 ~]# ulimit -n unlimited bash: ulimit: open files: cannot modify limit: Operation not permitted [root@ngelinux001 ~]#
This happens since there is restriction set on system with maximum files via the kernel parameter.
We can check this value and set it a little less than this.
[root@ngelinux001 ~]# sysctl -a | grep -i file-max fs.file-max = 26158104 [root@ngelinux001 ~]# ulimit -n 655350 655350 [root@ngelinux001 ~]# ulimit -n 655350
Now as we can see we have set it to a relatively very high value.
And now our purpose is solved having high number of open files.