- Plesk Onyx for Linux
The following warnings appear within the Docker management utilities:
# docker info > /dev/null
WARNING: No memory limit support
WARNING: No swap limit support
WARNING: No kernel memory limit support
WARNING: No oom kill disable support
WARNING: No cpu cfs quota support
WARNING: No cpu cfs period support
Following warnings can be found in Journal of the Docker service:
# journalctl -u docker
dockerd: time="2017-12-29T16:11:50.653789473Z" level=warning msg="Your kernel does not support cgroup rt runtime"
dockerd: time="2017-12-29T16:11:50.653889806Z" level=warning msg="mountpoint for pids not found"
systemd: [/lib/systemd/system/docker.service:25] Unknown lvalue 'Delegate' in section 'Service'
Debian 8 is used on the server:
# lsb_release -ic
Distributor ID: Debian
The version of the kernel is below 4.9:
# uname -a
Linux example.com 3.16.0-4-amd64 #1 SMP Debian 3.16.51-2 (2017-12-03) x86_64 GNU/Linux
Cgroups features, required by Docker, are not supported by the current kernel.
These warnings show that no memory, CPU and swap limitations could be applied to Docker containers.
The following instruction might be used to upgrade the kernel: How to upgrade kernel .