在创建Dashborad时，查看状态总是ContainerCreating
kubectl get pods -n kube-system NAME READY STATUS RESTARTS AGE kubernetes-dashboard-latest-4167338039-cjh13 0/1 ContainerCreating 0 47s
查看日志/var/log/message，发现有如下日志信息：
kubectl get pods -n kube-system May 31 17:29:19 apm-slave03 kubelet: E0531 17:29:19.526941 24919 docker_manager.go:2159] Failed to create pod infra container: ImagePullBackOff; Skipping pod "kubernetes-dashboard-latest-4167338039-cjh13_kube-system(0ba4a71f-64ae-11e8-9a31-005056bc2ad1)": Back-off pulling image "registry.access.redhat.com/rhel7/pod-infrastructure:latest"
发现此时会pull一个镜像registry.access.redhat.com/rhel7/pod-infrastructure:latest，当我手动pull时，提示如下错误：
kubectl get pods -n kube-system docker pull registry.access.redhat.com/rhel7/pod-infrastructure:latest Trying to pull repository registry.access.redhat.com/rhel7/pod-infrastructure ... open /etc/docker/certs.d/registry.access.redhat.com/redhat-ca.crt: no such file or directory
通过搜索得知，需要安装rhsm：
kubectl get pods -n kube-system yum install *rhsm* 已加载插件：fastestmirror, langpacks Loading mirror speeds from cached hostfile * base: mirror.lzu.edu.cn * extras: mirror.lzu.edu.cn * updates: ftp.sjtu.edu.cn base | 3.6 kB 00:00:00 extras | 3.4 kB 00:00:00 updates | 3.4 kB 00:00:00 软件包 python-rhsm-1.19.10-1.el7_4.x86_64 被已安装的 subscription-manager-rhsm-1.20.11-1.el7.centos.x86_64 取代 软件包 subscription-manager-rhsm-1.20.11-1.el7.centos.x86_64 已安装并且是最新版本 软件包 python-rhsm-certificates-1.19.10-1.el7_4.x86_64 被已安装的 subscription-manager-rhsm-certificates-1.20.11-1.el7.centos.x86_64 取代 软件包 subscription-manager-rhsm-certificates-1.20.11-1.el7.centos.x86_64 已安装并且是最新版本
但是在/etc/rhsm/ca/目录下依旧没有证书文件，于是反复卸载与安装都不靠谱，后来发现大家所谓yum install *rhsm*其实安装的的是python-rhsm-1.19.10-1.el7_4.x86_64和python-rhsm-certificates-1.19.10-1.el7_4.x86_64，但是在实际安装过程中会有如下提示:
kubectl get pods -n kube-system 软件包 python-rhsm-1.19.10-1.el7_4.x86_64 被已安装的 subscription-manager-rhsm-1.20.11-1.el7.centos.x86_64 取代 软件包 subscription-manager-rhsm-1.20.11-1.el7.centos.x86_64 已安装并且是最新版本 软件包 python-rhsm-certificates-1.19.10-1.el7_4.x86_64 被已安装的 subscription-manager-rhsm-certificates-1.20.11-1.el7.centos.x86_64 取代 软件包 subscription-manager-rhsm-certificates-1.20.11-1.el7.centos.x86_64 已安装并且是最新版本
罪魁祸首在这里。原来我们想要安装的rpm包被取代了。而取代后的rpm包在安装完成后之创建了目录，并没有证书文件redhat-uep.pem。于是乎，手动下载以上两个包
kubectl get pods -n kube-system wget ftp://ftp.icm.edu.pl/vol/rzm6/linux-scientificlinux/7.4/x86_64/os/Packages/python-rhsm-certificates-1.19.9-1.el7.x86_64.rpm wget ftp://ftp.icm.edu.pl/vol/rzm6/linux-scientificlinux/7.4/x86_64/os/Packages/python-rhsm-1.19.9-1.el7.x86_64.rpm
注意版本要匹配，卸载安装错的包
kubectl get pods -n kube-system yum remove *rhsm*
然后执行安装命令
kubectl get pods -n kube-system rpm -ivh *.rpm
kubectl get pods -n kube-system rpm -ivh *.rpm 警告：python-rhsm-1.19.9-1.el7.x86_64.rpm: 头V4 DSA/SHA1 Signature, 密钥 ID 192a7d7d: NOKEY 准备中... ################################# [100%] 正在升级/安装... 1:python-rhsm-certificates-1.19.9-1################################# [ 50%] 2:python-rhsm-1.19.9-1.el7 ################################# [100%]
接着验证手动pull镜像
kubectl get pods -n kube-system docker pull registry.access.redhat.com/rhel7/pod-infrastructure:latest Trying to pull repository registry.access.redhat.com/rhel7/pod-infrastructure ... latest: Pulling from registry.access.redhat.com/rhel7/pod-infrastructure 26e5ed6899db: Pull complete 66dbe984a319: Pull complete 9138e7863e08: Pull complete Digest: sha256:92d43c37297da3ab187fc2b9e9ebfb243c1110d446c783ae1b989088495db931 Status: Downloaded newer image for registry.access.redhat.com/rhel7/pod-infrastructure:latest
此时才算是解决这个问题。
当然同样的问题同样的解法可能有人可以有人不可以，我目测是因为系统发行版的缘故吧。我是用的是CentOS Linux release 7.5.1804 (Core) 他们的版本稍微低一点吧。
