Public bug reported: I recently upgraded from Ubuntu 14 to 18 and now I can't use ulimit -n to increase the allowed number of files open! This is a change from my previous version of Ubuntu.
Lines from /etc/security/limits.conf jonesdc hard nofile 100000 jonesdc soft nofile 10000 Setting in /etc/sysctl.conf # Max open files (system limit) fs.file-max = 100000 When I first open a terminal if I type $ulimit -n 1000 then $ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) 10000 pending signals (-i) 30927 max locked memory (kbytes, -l) 16384 max memory size (kbytes, -m) unlimited open files (-n) 1000 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 30927 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited Now if I type $ulimit -n 999 and then try again $ulimit -n 1000 bash: ulimit: open files: cannot modify limit: Operation not permitted Looking further, it appears that ulimit -n changes both the hard and soft limits $ulimit -H -a core file size (blocks, -c) unlimited data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 30927 max locked memory (kbytes, -l) 16384 max memory size (kbytes, -m) unlimited open files (-n) 999 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) unlimited cpu time (seconds, -t) unlimited max user processes (-u) 30927 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited ** Affects: lightdm (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to lightdm in Ubuntu. https://bugs.launchpad.net/bugs/1825188 Title: Just upgraded to ubunt 18 and now ulimit -n changes hard and soft limits Status in lightdm package in Ubuntu: New Bug description: I recently upgraded from Ubuntu 14 to 18 and now I can't use ulimit -n to increase the allowed number of files open! This is a change from my previous version of Ubuntu. Lines from /etc/security/limits.conf jonesdc hard nofile 100000 jonesdc soft nofile 10000 Setting in /etc/sysctl.conf # Max open files (system limit) fs.file-max = 100000 When I first open a terminal if I type $ulimit -n 1000 then $ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) 10000 pending signals (-i) 30927 max locked memory (kbytes, -l) 16384 max memory size (kbytes, -m) unlimited open files (-n) 1000 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 30927 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited Now if I type $ulimit -n 999 and then try again $ulimit -n 1000 bash: ulimit: open files: cannot modify limit: Operation not permitted Looking further, it appears that ulimit -n changes both the hard and soft limits $ulimit -H -a core file size (blocks, -c) unlimited data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 30927 max locked memory (kbytes, -l) 16384 max memory size (kbytes, -m) unlimited open files (-n) 999 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) unlimited cpu time (seconds, -t) unlimited max user processes (-u) 30927 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1825188/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp