[STEP] Limitation of the amount of the file which can be opened by Linux program

Step One: In system level, set the limitation of the amount of the files which can be opened by the user who running the Linux Program

# vi /etc/security/limites.conf

Add these lines:

......
rmt  -       nofile  1024
rmt  -       nproc   1024

(Add: Setting the rmt user can open 8192 files and 8192 processes in this Linux as an example here)

Step Two: In program level, check the setting of the amount of the files which can be opened by Linux program

# /bin/systemctl show 'rmt-server-mirror.service' | sort
......
LimitNOFILE=524288
......

(Add: The amount of opening the file by program rmt-server-mirror.service is limited at 8096 as an example here)

[CONTENT] System local ports batch occupation

Content One: Occupy system local ports manually

# startport=33000;endport=34000;for i in $(seq $startport $endport);do nc -lk $i &;done

(Add: Take start port is 33000 and end port is 34000 as an example here)

Content Two: Release all ports which are opened manually (kill all nc command processes)

# for i in $(ps -aux | grep nc | grep '\-lk' | awk '{print $2}');do kill $i; done