用k8s创建完pod后，发现无法访问demo应用，查了一下pods状态，发现都在containercreationg状态中
查看/etc/docker/certs.d/registry.access.redhat.com/redhat-ca.crt 是一个软链接，但是链接过去后并没有真实的/etc/rhsm，所以需要使用yum安装：
yum install *rhsm*
安装完成后，执行一下docker pull registry.access.redhat.com/rhel7/pod-infrastructure:latest
如果依然报错
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
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