lxc memory limit centos 7.6

[laplante]

lxc does not limit memory usager for a container with:

echo 0 > /sys/fs/cgroup/memory/lxc/testlimit/memory.swappiness
for i in memory.soft_limit_in_bytes memory.limit_in_bytes memory.kmem.limit_in_bytes memory.kmem.tcp.limit_in_bytes memory.memsw.limit_in_bytes
do
echo $i
echo 536870912 > /sys/fs/cgroup/memory/lxc/testlimit/$i
cat /sys/fs/cgroup/memory/lxc/testlimit/$i
done

Any solutions for this problem