在搭建的过程中遇到一个难题

本地将下载的镜像包，导入到本地并打好tag后，执行 kubeadm init命令，还会一直去拉取镜像，不知道原因？

[root@master log]# kubeadm  init
I1113 15:31:40.176593   20467 version.go:93] could not fetch a Kubernetes version from the internet: unable to get URL "https://dl.k8s.io/release/stable-1.txt": Get https://storage.googleapis.com/kubernetes-release/release/stable-1.txt: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)
I1113 15:31:40.176675   20467 version.go:94] falling back to the local client version: v1.12.2
[init] using Kubernetes version: v1.12.2
[preflight] running pre-flight checks
    [WARNING Hostname]: hostname "master" could not be reached
    [WARNING Hostname]: hostname "master" lookup master on 183.60.83.19:53: no such host
[preflight/images] Pulling images required for setting up a Kubernetes cluster
[preflight/images] This might take a minute or two, depending on the speed of your internet connection
[preflight/images] You can also perform this action in beforehand using 'kubeadm config images pull'

[preflight] Some fatal errors occurred:
    [ERROR ImagePull]: failed to pull image k8s.gcr.io/kube-apiserver:v1.12.2: output: Error response from daemon: Get http://k8s.gcr.io/v2/: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)
, error: exit status 1
    [ERROR ImagePull]: failed to pull image k8s.gcr.io/kube-controller-manager:v1.12.2: output: Error response from daemon: Get http://k8s.gcr.io/v2/: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)
, error: exit status 1
    [ERROR ImagePull]: failed to pull image k8s.gcr.io/kube-scheduler:v1.12.2: output: Error response from daemon: Get http://k8s.gcr.io/v2/: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)
, error: exit status 1
    [ERROR ImagePull]: failed to pull image k8s.gcr.io/pause:3.1: output: Error response from daemon: Get http://k8s.gcr.io/v2/: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
, error: exit status 1
    [ERROR ImagePull]: failed to pull image k8s.gcr.io/etcd:3.2.24: output: Error response from daemon: Get http://k8s.gcr.io/v2/: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)
, error: exit status 1
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`

查看安装需要的镜像

[root@master log]# kubeadm config images list
k8s.gcr.io/kube-apiserver:v1.12.2
k8s.gcr.io/kube-controller-manager:v1.12.2
k8s.gcr.io/kube-scheduler:v1.12.2
k8s.gcr.io/kube-proxy:v1.12.2
k8s.gcr.io/pause:3.1
k8s.gcr.io/etcd:3.2.24
k8s.gcr.io/coredns:1.2.2

查看本地镜像

[root@master log]# docker images
k8s.gcr.io/kube-proxy                v1.12.2             61afff57f010        5 weeks ago         96.6MB
k8s.gcr.io/kube-scheduler            v1.12.2             d773ad20fd80        5 weeks ago         58.3MB
k8s.gcr.io/kube-apiserver            v1.12.2             dcb029b5e3ad        5 weeks ago         194MB
k8s.gcr.io/kube-controller-manager   v1.12.2             aa2dd57c7329        5 weeks ago         164MB
k8s.gcr.io/etcd                      3.2.24              3cab8e1b9802        7 weeks ago         220MB
k8s.gcr.io/coredns                   1.2.2               367cdc8433a4        2 months ago        39.2MB
k8s.gcr.io/pause                     3.1                 da86e6ba6ca1        10 months ago       742kB
本地有镜像，为什么还要去拉取呢