使用kubeadm从0到1搭建kubernete集群

概述

安装前提示

安装docker

安装kubeadm

安装kubernete集群master节点

安装 kubeadm/kubectl/kubelet组件

安装kubernete master节点

安装CNI网络插件

部署集群worker节点

安装dashboard

总结

参考文章

概述

kubeadm是一个部署kubernete集群的非常易用的工具，只需要2条命令kubeadm init和kubeadm join就可以搭建起kubernete的集群。它采用的方案是把kubelete直接部署在宿主机上，其他组件部署在容器中。

本文采用的机器资源：

2个vmware虚机，安装系统centos7，2核CPU，4G内存

hostname	内存	CPU	操作系统	虚拟类型
master	4G	2核	centos7	vmware
worker1	4G	2核	centos7	vmware

安装前提示

1.给虚拟机安装系统过程中，一定要指定hostname，不然2个虚拟机hostname默认一致，worker节点加入集群后，不能显示。安装好kubernete后再修改，会有各种问题，我本人没有搞定这些问题，所以我又重装了系统。安装操作系统时指定hostname的地方在页面上的network。参见下图。

2.虚机的硬件条件一定要满足2核CPU，不然会安装失败，错误如下：

3.安装系统时network里面的ens33要选择connection，如下图。不然安装安装后ens33没有ip地址，需要命令修改文件/etc/sysconfig/network-scripts/ifcfg-ens33中onboot=yes，之后执行命令service network restart

4.安装kubelet kubeadm kubectl组件时最好指定版本，阿里云不一定有最新版本，本文采用v1.17.3，详见后面内容

安装docker

这里我们选择安装17.03.2版本，使用阿里云的镜像。

我选择离线安装

在官网https://download.docker.com/linux/centos/7/x86_64/stable/Packages/下载2个文件

docker-ce-17.03.2.ce-1.el7.centos.x86_64.rpm
docker-ce-selinux-17.03.2.ce-1.el7.centos.noarch.rpm

之后拷贝到虚机，执行下面命令即可安装

rpm -ivh docker-ce-selinux-17.03.2.ce-1.el7.centos.noarch.rpm
rpm -ivh docker-ce-17.03.2.ce-1.el7.centos.x86_64.rpm

或

yum install docker-ce-selinux-17.03.2.ce-1.el7.centos.noarch.rpm
yum install docker-ce-17.03.2.ce-1.el7.centos.x86_64.rpm

过程如下：

[root@worker1 docker]# rpm -ivh docker-ce-selinux-17.03.2.ce-1.el7.centos.noarch.rpm
warning: docker-ce-selinux-17.03.2.ce-1.el7.centos.noarch.rpm: Header V4 RSA/SHA512 Signature, key ID 621e9f35: NOKEY
Preparing...                          ################################# [100%]
Updating / installing...1:docker-ce-selinux-17.03.2.ce-1.el################################# [100%]
Re-declaration of type docker_t
Failed to create node
Bad type declaration at /etc/selinux/targeted/tmp/modules/400/docker/cil:1
/usr/sbin/semodule:  Failed!
restorecon:  lstat(/var/lib/docker) failed:  No such file or directory
warning: %post(docker-ce-selinux-17.03.2.ce-1.el7.centos.noarch) scriptlet failed, exit status 255
[root@worker1 docker]# rpm -ivh docker-ce-17.03.2.ce-1.el7.centos.x86_64.rpm
warning: docker-ce-17.03.2.ce-1.el7.centos.x86_64.rpm: Header V4 RSA/SHA512 Signature, key ID 621e9f35: NOKEY
Preparing...                          ################################# [100%]
Updating / installing...1:docker-ce-17.03.2.ce-1.el7.centos################################# [100%]
[root@worker1 docker]# docker -v
Docker version 17.03.2-ce, build f5ec1e2

启动docker服务

systemctl start docker.service

安装kubeadm

有3中方式：二进制安装、翻墙安装和使用阿里云镜像安装，前2种方式不介绍了，大家可以百度一下，使用阿里云镜像是最简单的安装方式。

使用如下代码配置源文件地址

cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

再执行如下命令就可以安装了：

yum install -y kubelet kubeadm kubectl

安装kubernete集群master节点

安装 kubeadm/kubectl/kubelet组件

安装好kubeadm后，就可以使用kubeadm来部署kubernete集群了，首先部署master节点，命令如下：

kubeadm init

再次执行kubeadm init命令，报如下错误：

从报错信息中可以找到问题，执行如下2个命令进行修复：

echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables
swapoff -a

再次查看swap是否已经关闭，可以看出，swap已经是0了

再来，这次报错不一样了，kubernete相关组件的国外镜像拉取不到

使用阿里云镜像来拉取kubernete组件，命令如下：

kubeadm init --image-repository registry.aliyuncs.com/google_containers

再次报错，找不到v1.18.3版本，只好降一个版本，使用v1.17.3，这时候需要重新安装kubeadm组件，首先删除之前的组件

yum remove kubeadm.x86_64 kubectl.x86_64 kubelet.x86_64

执行命令安装版本v1.17.3

yum install -y kubelet-1.17.3 kubeadm-1.17.3 kubectl-1.17.3

安装成功日志如下：

安装kubernete master节点

kubeadm init --image-repository registry.cn-hangzhou.aliyuncs.com/google_containers

这次竟然默认安装v1.17.6版本，又是找不到，我们还是指定版本号v1.17.3吧

kubeadm init --image-repository registry.aliyuncs.com/google_containers --kubernetes-version=v1.17.3 --pod-network-cidr=192.168.59.0/16

这次一路成功，最后日志如下：

[root@master docker]# kubeadm init --image-repository registry.aliyuncs.com/google_containers --kubernetes-version=v1.17.3 --pod-network-cidr=192.168.59.0/16
W0528 09:08:40.669505   24739 validation.go:28] Cannot validate kube-proxy config - no validator is available
W0528 09:08:40.669664   24739 validation.go:28] Cannot validate kubelet config - no validator is available
[init] Using Kubernetes version: v1.17.3
[preflight] Running pre-flight checks[WARNING Firewalld]: firewalld is active, please ensure ports [6443 10250] are open or your cluster may not function correctly[WARNING Service-Docker]: docker service is not enabled, please run 'systemctl enable docker.service'[WARNING IsDockerSystemdCheck]: detected "cgroupfs" as the Docker cgroup driver. The recommended driver is "systemd". Please follow the guide at https://kubernetes.io/docs/setup/cri/[WARNING Hostname]: hostname "master" could not be reached[WARNING Hostname]: hostname "master": lookup master on 192.168.59.2:53: server misbehaving[WARNING Service-Kubelet]: kubelet service is not enabled, please run 'systemctl enable kubelet.service'
[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'
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Starting the kubelet
[certs] Using certificateDir folder "/etc/kubernetes/pki"
[certs] Generating "ca" certificate and key
[certs] Generating "apiserver" certificate and key
[certs] apiserver serving cert is signed for DNS names [master kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 192.168.59.132]
[certs] Generating "apiserver-kubelet-client" certificate and key
[certs] Generating "front-proxy-ca" certificate and key
[certs] Generating "front-proxy-client" certificate and key
[certs] Generating "etcd/ca" certificate and key
[certs] Generating "etcd/server" certificate and key
[certs] etcd/server serving cert is signed for DNS names [master localhost] and IPs [192.168.59.132 127.0.0.1 ::1]
[certs] Generating "etcd/peer" certificate and key
[certs] etcd/peer serving cert is signed for DNS names [master localhost] and IPs [192.168.59.132 127.0.0.1 ::1]
[certs] Generating "etcd/healthcheck-client" certificate and key
[certs] Generating "apiserver-etcd-client" certificate and key
[certs] Generating "sa" key and public key
[kubeconfig] Using kubeconfig folder "/etc/kubernetes"
[kubeconfig] Writing "admin.conf" kubeconfig file
[kubeconfig] Writing "kubelet.conf" kubeconfig file
[kubeconfig] Writing "controller-manager.conf" kubeconfig file
[kubeconfig] Writing "scheduler.conf" kubeconfig file
[control-plane] Using manifest folder "/etc/kubernetes/manifests"
[control-plane] Creating static Pod manifest for "kube-apiserver"
[control-plane] Creating static Pod manifest for "kube-controller-manager"
W0528 09:08:55.439922   24739 manifests.go:214] the default kube-apiserver authorization-mode is "Node,RBAC"; using "Node,RBAC"
[control-plane] Creating static Pod manifest for "kube-scheduler"
W0528 09:08:55.442026   24739 manifests.go:214] the default kube-apiserver authorization-mode is "Node,RBAC"; using "Node,RBAC"
[etcd] Creating static Pod manifest for local etcd in "/etc/kubernetes/manifests"
[wait-control-plane] Waiting for the kubelet to boot up the control plane as static Pods from directory "/etc/kubernetes/manifests". This can take up to 4m0s
[kubelet-check] Initial timeout of 40s passed.
[apiclient] All control plane components are healthy after 217.504294 seconds
[upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[kubelet] Creating a ConfigMap "kubelet-config-1.17" in namespace kube-system with the configuration for the kubelets in the cluster
[upload-certs] Skipping phase. Please see --upload-certs
[mark-control-plane] Marking the node master as control-plane by adding the label "node-role.kubernetes.io/master=''"
[mark-control-plane] Marking the node master as control-plane by adding the taints [node-role.kubernetes.io/master:NoSchedule]
[bootstrap-token] Using token: kw377c.z478de8wq0i41ksq
[bootstrap-token] Configuring bootstrap tokens, cluster-info ConfigMap, RBAC Roles
[bootstrap-token] configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials
[bootstrap-token] configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token
[bootstrap-token] configured RBAC rules to allow certificate rotation for all node client certificates in the cluster
[bootstrap-token] Creating the "cluster-info" ConfigMap in the "kube-public" namespace
[kubelet-finalize] Updating "/etc/kubernetes/kubelet.conf" to point to a rotatable kubelet client certificate and key
[addons] Applied essential addon: CoreDNS
[addons] Applied essential addon: kube-proxyYour Kubernetes control-plane has initialized successfully!To start using your cluster, you need to run the following as a regular user:mkdir -p $HOME/.kubesudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/configsudo chown $(id -u):$(id -g) $HOME/.kube/configYou should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:https://kubernetes.io/docs/concepts/cluster-administration/addons/Then you can join any number of worker nodes by running the following on each as root:kubeadm join 192.168.59.132:6443 --token kw377c.z478de8wq0i41ksq \
--discovery-token-ca-cert-hash sha256:d32410d53b7b4546dd4cc4967b8e2c7779d5fd9244c8342b7f8ffa16e855a12f

可以看到安装成功了，我们查看一下pod状态，

[root@localhost docker]# kubectl get pods --all-namespaces
The connection to the server localhost:8080 was refused - did you specify the right host or port?

执行如下命令可以解决：

mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

执行这3条命令的原因是：Kubernetes 集群默认需要加密方式访问。将刚刚部署生成的 Kubernetes 集群的安全配置文件，保存到当前用户的.kube 目录下，kubectl 默认就会使用这个目录下的授权信息访问 Kubernetes 集群。

如果遇到问题：Unable to connect to the server: x509: certificate signed by unknown authority (possibly because of "crypto/rsa: verification error" while trying to verify candidate authority certificate "kubernetes") 也可以执行上面命令解决

再次查看pod状态

[root@localhost docker]# kubectl get pods --all-namespaces
NAMESPACE     NAME                                            READY   STATUS    RESTARTS   AGE
kube-system   coredns-9d85f5447-c9vg5                         0/1     Pending   0          19h
kube-system   coredns-9d85f5447-w4w9n                         0/1     Pending   0          19h
kube-system   etcd-localhost.localdomain                      1/1     Running   0          19h
kube-system   kube-apiserver-localhost.localdomain            1/1     Running   0          19h
kube-system   kube-controller-manager-localhost.localdomain   1/1     Running   1          19h
kube-system   kube-proxy-zvq6z                                1/1     Running   0          19h
kube-system   kube-scheduler-localhost.localdomain            1/1     Running   1          19h

下面，我们再看一下nodes状态：

[root@localhost docker]# kubectl get nodes
NAME                    STATUS     ROLES    AGE   VERSION
Master   NotReady   master   20h   v1.17.3

安装CNI网络插件

从上面可以看出master节点还没有准备好，原因在于网络插件没有部署好，下面我们部署网络插件。Kubernete网络方案主要是基于CNI的实现，比如Flannel、Calico、Canal、Romana，这儿我们使用flannel。命令如下：

kubectl apply -f ttps://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

我使用的yaml文件地址：

https://github.com/jinjunzhu/kubernete/blob/master/kube-flannel.yml

注意：这个过程会慢一些，看本地网络状况，耐心等待。

之后在查看pod状态：

[root@localhost k8s]# kubectl get pods -n kube-system
NAME                                            READY   STATUS    RESTARTS   AGE
coredns-9d85f5447-lcs5s                         0/1     Running   0          5m31s
coredns-9d85f5447-wllzv                         0/1     Running   0          5m31s
etcd-localhost.localdomain                      1/1     Running   0          5m40s
kube-apiserver-localhost.localdomain            1/1     Running   0          5m40s
kube-controller-manager-localhost.localdomain   1/1     Running   0          5m40s
kube-flannel-ds-amd64-9vv4m                     1/1     Running   0          38s
kube-proxy-qv6z5                                1/1     Running   0          5m31s
kube-scheduler-localhost.localdomain            1/1     Running   0          5m40s

再查看节点状态

[root@localhost flannel]# kubectl get node
NAME                    STATUS   ROLES    AGE     VERSION
master   Ready    master   3m20s   v1.17.3

至此master节点启动成功了

注意：在部署过程中，可以会遇到网络失败的问题，这时候如果各种命令都不好解决，可以执行kubeadm reset 之后重新执行init过程

部署集群worker节点

部署worker节点比部署master节点简单，不用运行 kube-apiserver、kube-scheduler、kube-controller-manger这3个节点。

Worker节点机器上也要执行下面命令：

echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables
swapoff -a

首先跟上一节一样安装docker和kubeadm，然后执行如下命令，也就是部署master节点的输出

kubeadm join 192.168.59.132:6443 --token kw377c.z478de8wq0i41ksq --discovery-token-ca-cert-hash sha256:d32410d53b7b4546dd4cc4967b8e2c7779d5fd9244c8342b7f8ffa16e855a12f

注意：worker节点要关闭防火墙：

systemctl stop firewalld
service  iptables stop

执行命令后报错：

[root@localhost pki]# kubeadm join 192.168.59.132:6443 --token kw377c.z478de8wq0i41ksq --discovery-token-ca-cert-hash sha256:d32410d53b7b4546dd4cc4967b8e2c7779d5fd9244c8342b7f8ffa16e855a12fW0527 13:15:35.059010   18952 join.go:346] [preflight] WARNING: JoinControlPane.controlPlane settings will be ignored when control-plane flag is not set.
[preflight] Running pre-flight checks
[preflight] Reading configuration from the cluster...
[preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml'
[kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.17" ConfigMap in the kube-system namespace
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Starting the kubelet
[kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap...
[kubelet-check] Initial timeout of 40s passed.
[kubelet-check] It seems like the kubelet isn't running or healthy.
[kubelet-check] The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with error: Get http://localhost:10248/healthz: dial tcp [::1]:10248: connect: connection refused.
[kubelet-check] It seems like the kubelet isn't running or healthy.
[kubelet-check] The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with error: Get http://localhost:10248/healthz: dial tcp [::1]:10248: connect: connection refused.
[kubelet-check] It seems like the kubelet isn't running or healthy.
[kubelet-check] The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with error: Get http://localhost:10248/healthz: dial tcp [::1]:10248: connect: connection refused.
[kubelet-check] It seems like the kubelet isn't running or healthy.
[kubelet-check] The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with error: Get http://localhost:10248/healthz: dial tcp [::1]:10248: connect: connection refused.
[kubelet-check] It seems like the kubelet isn't running or healthy.
[kubelet-check] The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with error: Get http://localhost:10248/healthz: dial tcp [::1]:10248: connect: connection refused.Unfortunately, an error has occurred:timed out waiting for the conditionThis error is likely caused by:- The kubelet is not running- The kubelet is unhealthy due to a misconfiguration of the node in some way (required cgroups disabled)If you are on a systemd-powered system, you can try to troubleshoot the error with the following commands:- 'systemctl status kubelet'- 'journalctl -xeu kubelet'
error execution phase kubelet-start: timed out waiting for the condition
To see the stack trace of this error execute with --v=5 or higher

从日志中可以看出，kubelete启动异常，这个原因是因为这个虚机上我之前搭建过minikube。我尝试了多种方式删除之前的环境，但是都没有成功。只能重新装系统了。我给这个虚机重新装了系统后，重新安装docker，kubeadm，之后执行kubectl join命令，结果如下：

[root@worker1 ~]# kubeadm join 192.168.59.132:6443 --token kw377c.z478de8wq0i41ksq --discovery-token-ca-cert-hash sha256:d32410d53b7b4546dd4cc4967b8e2c7779d5fd9244c8342b7f8ffa16e855a12f
W0528 21:57:11.003270   16810 join.go:346] [preflight] WARNING: JoinControlPane.controlPlane settings will be ignored when control-plane flag is not set.
[preflight] Running pre-flight checks[WARNING Service-Docker]: docker service is not enabled, please run 'systemctl enable docker.service'[WARNING IsDockerSystemdCheck]: detected "cgroupfs" as the Docker cgroup driver. The recommended driver is "systemd". Please follow the guide at https://kubernetes.io/docs/setup/cri/[WARNING Hostname]: hostname "worker1" could not be reached[WARNING Hostname]: hostname "worker1": lookup worker1 on 192.168.59.2:53: server misbehaving[WARNING Service-Kubelet]: kubelet service is not enabled, please run 'systemctl enable kubelet.service'
[preflight] Reading configuration from the cluster...
[preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml'
[kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.17" ConfigMap in the kube-system namespace
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Starting the kubelet
[kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap...This node has joined the cluster:
* Certificate signing request was sent to apiserver and a response was received.
* The Kubelet was informed of the new secure connection details.Run 'kubectl get nodes' on the control-plane to see this node join the cluster.在master节点上执行kubectl get nodes结果如下：
[root@master ~]# kubectl get node
NAME      STATUS   ROLES    AGE   VERSION
master    Ready    master   12h   v1.17.3
worker1   Ready    <none>   29s   v1.17.3

安装dashboard

安装dashboard理论上非常简单，实际上坑非常多，命令如下：

kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0-rc6/aio/deploy/recommended.yaml

安装后发现dashboard的pod一直启动失败，如下图：

用如下命令查看日志

[root@master kubernetes]# kubectl logs kubernetes-dashboard-64999dbccd-gmk5x --namespace=kubernetes-dashboard
Error from server: Get https://192.168.59.136:10250/containerLogs/kubernetes-dashboard/kubernetes-dashboard-64999dbccd-gmk5x/kubernetes-dashboard: dial tcp 192.168.59.136:10250: connect: no route to host

根据网上的一些文档，master上默认不能部署pod，在master上搭建dashboard，需要注释掉如下3行：

之后再报这个错误：

initializing csrf token from kubernetes-dashboard-csrf secret panic: Get https://10.2.0.1:443/api/v1/namespaces/kubernetes-dashboard/secrets/kubernetes-dashboard-csrf: dial tcp 10.244.0.1:443: i/o timeout

网上找了一下原因，Dashboard只能集群内部访问，修改Service为NodePort类型，暴露到外部。最后参照网上的步骤做了修复，源码文件如下：

https://github.com/jinjunzhu/kubernete/blob/master/recommended.yaml

改好yaml文件后，执行kubectl apply -f recommended.yaml 安装成功

登陆dashboard页面，如下，需要token

创建用户，命令如下：

kubectl create serviceaccount dashboard-admin -n kube-system
kubectl create clusterrolebinding dashboard-admin --clusterrole=cluster-admin --serviceaccount=kube-system:dashboard-admin
kubectl describe secrets -n kube-system $(kubectl -n kube-system get secret | awk ‘/dashboard-admin/{print $1}‘)

最后一条命令截取一部分输出如下：

Type:  kubernetes.io/service-account-tokenData
====
ca.crt:     1025 bytes
namespace:  11 bytes
token:      eyJhbGciOiJSUzI1NiIsImtpZCI6IkF5bjJEM3g0cjJCS282TlNCcjU0aVdTRE4wT0JqaE05LUxuODlTRFVkR1UifQ.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.BFORGRlEK7i7kPvGnDQDZKr5ow6feuWWymhor_BPecd1YUUMXnwDy9JvPPUizHMQnRxmA4HO-WlRcAcYXOFsWBQ9fz3KqLQuSJEDICz128XyA5bUEesS_MKqGTh7p4drc2OuduW7EHm2_UEs8g9SUeogTrp9JksQlEXUoln5TnactpzMr2J6w3hPKO85z3eUv_14f240kfYgN0jR6Q9owlDEcG27onNlDHvT2hGNs-9IJaBFSuPobf7zuJLY4GR2qkLGclszgFKHGsl8NObrS2c5_Ep7iQBBfw4STTCzuW5tG9gNKWzwXKwAnJTM2wu6oePBJ34df6rGAjzjXNlvHgName:         coredns-token-z26jv
Namespace:    kube-system
Labels:       <none>
Annotations:  kubernetes.io/service-account.name: corednskubernetes.io/service-account.uid: ddd1ae67-1045-4674-8277-11f4ccee2e65Type:  kubernetes.io/service-account-token

把上面的token复制到上面截图的token输入框，登陆成功。查看集群信息，截图如下：

总结

部署kubernete集群还是有不小的门槛，先得了解一下kubernete的工作原理和各个组件的作用，遇到不能拉取的镜像首先选择阿里云，阿里云一般都可以找到，遇到问题多看官网上的issue，好多中文的博客讲不透彻。

参考文章

https://developer.aliyun.com/mirror/kubernetes?spm=a2c6h.13651102.0.0.3e221b11xCHTc0
https://www.kubernetes.org.cn/7189.html
https://github.com/kubernetes/kubernetes/issues/54542
https://kubernetes.io/docs/setup/production-environment/container-runtimes/
https://github.com/kubernetes/dashboard/blob/master/docs/user/installation.md
https://github.com/kubernetes/dashboard/blob/master/README.md
http://www.mamicode.com/info-detail-2961782.html

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