1.执行以下代码错误：
kubeadm init \
--kubernetes-version=v1.17.4 \
--pod-network-cidr=10.244.0.0/16 \
--service-cidr=10.96.0.0/12 \
--apiserver-advertise-address=192.168.159.21
2.报错信息：
[root@master ~]# kubeadm init \
> --kubernetes-version=v1.17.4 \
> --pod-network-cidr=10.244.0.0/16 \
> --service-cidr=10.96.0.0/12 \
> --apiserver-advertise-address=192.168.159.21
W1109 10:26:28.265274 2406 validation.go:28] Cannot validate kube-proxy config - no validator is available
W1109 10:26:28.265424 2406 validation.go:28] Cannot validate kubelet config - no validator is available
[init] Using Kubernetes version: v1.17.4
[preflight] Running pre-flight checks
[preflight] Pulling images required for setting up a Kubernetes cluster
[preflight] This might take a minute or two, depending on the speed of your internet connection
[preflight] You can also perform this action in beforehand using 'kubeadm config images pull'
^C
[root@master ~]# kubeadm init \
> --kubernetes-version=v1.17.4 \
> --pod-network-cidr=10.244.0.0/16 \
> --service-cidr=10.96.0.0/12 \
> --apiserver-advertise-address=192.168.159.21
W1109 10:29:33.395709 2645 validation.go:28] Cannot validate kube-proxy config - no validator is available
W1109 10:29:33.396073 2645 validation.go:28] Cannot validate kubelet config - no validator is available
[init] Using Kubernetes version: v1.17.4
[preflight] Running pre-flight checks
[preflight] Pulling images required for setting up a Kubernetes cluster
[preflight] This might take a minute or two, depending on the speed of your internet connection
[preflight] You can also perform this action in beforehand using 'kubeadm config images pull'
error execution phase preflight: [preflight] Some fatal errors occurred:
[ERROR ImagePull]: failed to pull image k8s.gcr.io/kube-apiserver:v1.17.4: output: Trying to pull repository k8s.gcr.io/kube-apiserver ...
Get https://k8s.gcr.io/v1/_ping: dial tcp 64.233.187.82:443: connect: connection refused
, error: exit status 1
[ERROR ImagePull]: failed to pull image k8s.gcr.io/kube-controller-manager:v1.17.4: output: Trying to pull repository k8s.gcr.io/kube-controller-manager ...
Get https://k8s.gcr.io/v1/_ping: dial tcp 64.233.187.82:443: connect: connection refused
, error: exit status 1
[ERROR ImagePull]: failed to pull image k8s.gcr.io/kube-scheduler:v1.17.4: output: Trying to pull repository k8s.gcr.io/kube-scheduler ...
Get https://k8s.gcr.io/v1/_ping: dial tcp 142.251.8.82:443: connect: connection refused
, error: exit status 1
[ERROR ImagePull]: failed to pull image k8s.gcr.io/kube-proxy:v1.17.4: output: Trying to pull repository k8s.gcr.io/kube-proxy ...
Get https://k8s.gcr.io/v1/_ping: dial tcp 142.251.8.82:443: connect: connection refused
, error: exit status 1
[ERROR ImagePull]: failed to pull image k8s.gcr.io/pause:3.1: output: Trying to pull repository k8s.gcr.io/pause ...
Get https://k8s.gcr.io/v1/_ping: dial tcp 142.251.8.82:443: connect: connection refused
, error: exit status 1
[ERROR ImagePull]: failed to pull image k8s.gcr.io/etcd:3.4.3-0: output: Trying to pull repository k8s.gcr.io/etcd ...
Get https://k8s.gcr.io/v1/_ping: dial tcp 142.251.8.82:443: connect: connection refused
, error: exit status 1
[ERROR ImagePull]: failed to pull image k8s.gcr.io/coredns:1.6.5: output: Trying to pull repository k8s.gcr.io/coredns ...
Get https://k8s.gcr.io/v1/_ping: dial tcp 108.177.125.82:443: connect: connection refused
, error: exit status 1
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`
To see the stack trace of this error execute with --v=5 or higher
3.原因：
kubernetes v1.18.3 安装时需要从 k8s.gcr.io 拉取镜像，但是该网站被我国屏蔽了，国内没法正常访问导致没法正常进行kubernetes正常安装。
这里通过介绍从Docker官方默认镜像平台拉取镜像并重新打tag的方式来绕过对 k8s.gcr.io 的访问。
4.解决方法通过执行 kubeadm config images list 获取到需要拉取的镜像列表。
试过部分国内镜像源没有v1.18.3镜像，从https://hub.docker.com//mirrorgcrio/xxx 拉取k8s.gcr.io对应的镜像有效
5.具体命令
5.1：docker pull镜像拉取命令
docker pull mirrorgcrio/kube-apiserver:v1.18.3
docker pull mirrorgcrio/kube-controller-manager:v1.18.3
docker pull mirrorgcrio/kube-scheduler:v1.18.3
docker pull mirrorgcrio/kube-proxy:v1.18.3
docker pull mirrorgcrio/pause:3.2
docker pull mirrorgcrio/etcd:3.4.3-0
docker pull mirrorgcrio/coredns:1.6.7
5.2：docker tag镜像重命名
docker tag mirrorgcrio/kube-apiserver:v1.18.3 k8s.gcr.io/kube-apiserver:v1.18.3
docker tag mirrorgcrio/kube-controller-manager:v1.18.3 k8s.gcr.io/kube-controller-manager:v1.18.3
docker tag mirrorgcrio/kube-scheduler:v1.18.3 k8s.gcr.io/kube-scheduler:v1.18.3
docker tag mirrorgcrio/kube-proxy:v1.18.3 k8s.gcr.io/kube-proxy:v1.18.3
docker tag mirrorgcrio/pause:3.2 k8s.gcr.io/pause:3.2
docker tag mirrorgcrio/etcd:3.4.3-0 k8s.gcr.io/etcd:3.4.3-0
docker tag mirrorgcrio/coredns:1.6.7 k8s.gcr.io/coredns:1.6.7
5.3：docker image rm命令删除原始镜像
docker image rm mirrorgcrio/kube-apiserver:v1.18.3
docker image rm mirrorgcrio/kube-controller-manager:v1.18.3
docker image rm mirrorgcrio/kube-scheduler:v1.18.3
docker image rm mirrorgcrio/kube-proxy:v1.18.3
docker image rm mirrorgcrio/pause:3.2
docker image rm mirrorgcrio/etcd:3.4.3-0
docker image rm mirrorgcrio/coredns:1.6.7
完成可以继续安装kubernetes了