Docker mirror push error

The registry on the server has already started

Read the next document to use Insecure Registry to add DOCKER_OPTS="--insecure-registry myregistrydomain.com:5000"
But did not find /etc/sysconfig/docker this document ,所以就在docker.service added the following (centos7 seems not /etc/sysconfig/docker this document)

 ExecStart=/usr/bin/docker daemon --registry-mirror=https://187wuopo.mirror.aliyuncs.com --insecure-registry 121.42.217.35:5000 -H fd:// 

sudo docker push 121.42.217.35:5000/php:7

Error:
Get https://121.42.217.35:5000/v1/_ping: tls: oversized record received with length 20527

Feeling is DOCKER_OPTS misplaced place …

Heads up! This alert needs your attention, but it's not super important.