Process: 64 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited, status=226/NAMESPACE)
If you have problems start centos 7 on docker running ssytemd without privileged containers rights:
sed -i s/PrivateTmp=True/PrivateTmp=False/ /lib/systemd/system/httpd.service
systemctl daemon-reload
and; systemctl start httpd
Thanks! Was looking for the answer to this on Google for hours before stumbling across your site!