现象: get https://hub.yun.paic.cn/v1/users/: x509 :certificate signed by unknown authority
解决方案:
1.创建证书目录:
mkdir /etc/docker/certs.d/hub.yun.paic.com.cn -pv
2.生成镜像证书:
echo -n|openssl s_client -servername hub.yun.paic.com.cn -showcerts -connect hub.yun.paic.com.cn:443 2 >/dev/null|sed -ne '/-BEDIN CERIFICATE -/,/-END CERTIFICATE -/p' >/etc/docker/certs.d/hub.yun.paic.com.cn/ca.crt