docker push 或pull镜像时报错，拒接链接

$sudo vim /etc/default/docker 查看是不是镜像私有仓库的地址和端口号是否正确.

19 # This is also a handy place to tweak where Docker's temporary files go.
20 #export DOCKER_TMPDIR="/mnt/bigdrive/docker-tmp"
21 DOCKER_OPTS="--insecure-registry docker-reg.domain.com.cn:55688"
22 #DOCKER_OPTS="--registry-mirror=http://aad0405c.m.daocloud.io"
23 DOCKER_OPTS="--registry-mirror=https://registry.docker-cn.com"

最后发现是私有仓库DOCKER_OPTS和docker国内源镜像地址发生冲突，将最后一行 DOCKER_OPTS="--registry-mirror=https://registry.docker-cn.com"注释掉，$sudo service docker restart 重启docker，解决了。