Docker warning - Your kernel does not support cgroup rt runtime - users - Fedora mailing-lists

29 May 2018


      I just installed docker then start the service and check the status.
It said "Your kernel does not support cgroup rt runtime"
There is bugzilla report about this
http://bugzilla.redhat.com/show_bug.cgi?id=1544096 but noted as
NOTABUG.
I am curious what is cgroup rt runtime? Can anyone explain what it about?
$ sudo systemctl status docker
● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled;
vendor preset: disabled)
   Active: active (running) since Tue 2018-05-29 12:49:59 +08; 7s ago
     Docs: http://docs.docker.com
 Main PID: 8017 (dockerd-current)
    Tasks: 18 (limit: 8192)
   Memory: 15.5M
   CGroup: /system.slice/docker.service
           └─8017 /usr/bin/dockerd-current --add-runtime
oci=/usr/libexec/docker/docker-runc-current --default-runtime=oci
--authorization-plugin=rhel-push-plugin --containerd /run/containerd.>
May 29 12:49:55 robbinespu dockerd-current[8017]:
time="2018-05-29T12:49:55.536963292+08:00" level=warning msg="Your
kernel does not support cgroup rt runtime"
May 29 12:49:55 robbinespu dockerd-current[8017]:
time="2018-05-29T12:49:55.538150494+08:00" level=info msg="Loading
containers: start."
May 29 12:49:55 robbinespu dockerd-current[8017]:
time="2018-05-29T12:49:55.657192874+08:00" level=info msg="Firewalld
running: true"
May 29 12:49:56 robbinespu dockerd-current[8017]:
time="2018-05-29T12:49:56.984413042+08:00" level=info msg="Default
bridge (docker0) is assigned with an IP address 172.17.0.0/16. Daemon
optio>
May 29 12:49:58 robbinespu dockerd-current[8017]:
time="2018-05-29T12:49:57.764351240+08:00" level=info msg="Loading
containers: done."
May 29 12:49:59 robbinespu dockerd-current[8017]:
time="2018-05-29T12:49:59.075694600+08:00" level=warning msg="failed
to retrieve docker-init version: unknown output format: tini version
0.17>
May 29 12:49:59 robbinespu dockerd-current[8017]:
time="2018-05-29T12:49:59.076180698+08:00" level=info msg="Daemon has
completed initialization"
May 29 12:49:59 robbinespu dockerd-current[8017]:
time="2018-05-29T12:49:59.076209776+08:00" level=info msg="Docker
daemon" commit=1ab62f1-unsupported graphdriver=overlay2 version=1.13.1
May 29 12:49:59 robbinespu dockerd-current[8017]:
time="2018-05-29T12:49:59.108713645+08:00" level=info msg="API listen
on /var/run/docker.sock"
May 29 12:49:59 robbinespu systemd[1]: Started Docker Application
Container Engine.
-- 

Best Regards,
RN