Ulimits openvz
Resource limits is the concept where you regulate several resources consumed by a process on an UNIX operating systems.
show ulimits:
ulimit -a
Show soft limit:
ulimit -Sa
Hard limits:
ulimit -Ha
Also limits stored in file /etc/security/limits.conf
examples used in openvz production:
1 case. (working fine tested)
# ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 513923 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 10240 cpu time (seconds, -t) unlimited max user processes (-u) 1024 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited
2 case. more unlimited but seems could be problematic sometimes
# ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) unlimited max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 1024 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) 1024 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited
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To set ulimit specify it with param like:
ulimit -n 2048 # set open files limit
The limits will apply only for current shell. so you need to exit exact conf file if you like to apply limit globally/permanently