kubernetes YAML

yaml语法
error: yaml: line 2: mapping values are not allowed in this context
key: value，注意在value和“:"之间要有一个空格；

error: yaml: line 3: found character that cannot start any token
YAML文件里面不能出现tab键

查看异常
kubectl describe pod XXX
查看某个pod的详细信息，尤其是可以看到日志信息

异常日志
for "POD" with ErrImagePull: "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)"
（参考网调）其实当你打开/etc/docker/certs.d/registry.access.redhat.com/redhat-ca.crt路径去看的时候，发现其实是一个文件软连接，指向/etc/rhsm/XX文件夹里面；于是：
yum install -y *rhsm*
问题解决，看来其实每个/etc/文件夹下的子文件夹都对应一个service；如果发现某个/etc下面的软连接没有，则直接安装即可。rhsm是red hat subscription manager(RHSM)的简写，用于将系统注册到客户门户网站。为什么kubenetes需要用到RHSM，就不得而知，难道是kubenetes通过向redhat注册来看一下有多少用户使用kubenetes吗？

参考链接
http://www.voidcn.com/article/p-kpjywccp-bny.html