Docker --log-opt max-size=50m not working

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1

I have docker 17 installed on Centos7. But limiting logs are not working.

# rpm -qa | grep docker
docker-engine-17.05.0.ce-1.el7.centos.x86_64
docker-engine-selinux-17.05.0.ce-1.el7.centos.noarch

# cat /usr/lib/systemd/system/docker.service | grep log-
Environment="DOCKER_OPTIONS=--bip=172.17.100.1/24 --log-opt max-size=50m --log-opt max-file=2"

# pwd
/var/lib/docker/containers/adf4547dfb86455273d413d5b4f67708ea9305d7af16eb012c16b96145c86c47

# ls -lsh
total 115M
115M -rw-r----- 1 root root  51M Sep 25 08:49 adf4547dfb86455273d413d5b4f67708ea9305d7af16eb012c16b96145c86c47-json.log

Any idea?