Технология cgroup
cgroup v2
# systemd-cgls
/apache2
# cat /sys/fs/cgroup/system.slice/apache2.service/memory.high
# echo 500 > /sys/fs/cgroup/system.slice/apache2.service/memory.high
# curl 127.0.0.1
# systemctl stop apache2.service
# source /etc/apache2/envvars
# /usr/sbin/apache2 -k start
# csystemd-cgls
/apache2
# find /sys/fs/cgroup/ | grep session-NN
cgroup v1 (Debian10/Ubuntu20)
# ls /sys/fs/cgroup/
# mkdir /sys/fs/cgroup/memory/group0
# echo $$ > /sys/fs/cgroup/memory/group0/tasks
# echo 1M > /sys/fs/cgroup/memory/group0/memory.limit_in_bytes
или
# echo 512K > /sys/fs/cgroup/memory/group0/memory.limit_in_bytes
# vim anyfile