mysql 镜像下载失败，报错如下：
报错一：image pull failed for registry.access.redhat.com/rhel7/pod-infrastructure:latest, this may be because there are no credentials on this request. details: (open /etc/docker/certs.d/registry.access.redhat.com/redhat-ca.crt: no such file or directory)
解决方法：
yum install *rhsm* -y
转载自：https://stackoverflow.com/questions/47015810/error-syncing-pod-failed-for-registry-access-redhat-com-kubernetes
