kubectl describe pods xxx
提示错误Error syncing pod, skipping: failed to "StartContainer" for "POD" with ImagePullBackOff: "Back-off pulling image \"registry.access.redhat.com/rhel7/pod-infrastructure:latest\""
看到registry.access.redhat.com/rhel7/pod-infrastructure:latest感觉很奇怪，我设置的仓库是grc.io，为什么去拉取这个镜像，怀疑是不是什么没有安装好。尝试运行docker pull registry.access.redhat.com/rhel7/pod-infrastructure:latest，提示redhat-ca.crt: no such file or directory。ls查看改文件是个软连接，链接目标是/etc/rhsm，查看没有rhsm，尝试安装yum install *rhsm*，出现相关软件，感觉比较符合，所以安装查看产生了/etc/rhsm文件夹。
再次运行kubectl get pods

如果依然报错，可参考下面的方案：
wget http://mirror.centos.org/centos/7/os/x86_64/Packages/python-rhsm-certificates-1.19.10-1.el7_4.x86_64.rpm
rpm2cpio python-rhsm-certificates-1.19.10-1.el7_4.x86_64.rpm | cpio -iv --to-stdout ./etc/rhsm/ca/redhat-uep.pem | tee /etc/rhsm/ca/redhat-uep.pem
这两个命令会生成/etc/rhsm/ca/redhat-uep.pem文件.