错误标记大师：等待条件超时 [kubernetes]

Question

刚开始学习Kubernetes。我已经通过 Kubernetes YUM 存储库安装了 CentOS 7.5 和 SELinux 禁用的 kubectl、kubeadm 和 kubelet。

但是，当我想启动kubeadm init命令时。我收到此错误消息：

[init] using Kubernetes version: v1.12.2
[preflight] running pre-flight checks
    [WARNING Firewalld]: firewalld is active, please ensure ports [6443 10250] are open or your cluster may not function correctly
[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'
[kubelet] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[preflight] Activating the kubelet service
[certificates] Generated front-proxy-ca certificate and key.
[certificates] Generated front-proxy-client certificate and key.
[certificates] Generated etcd/ca certificate and key.
[certificates] Generated etcd/peer certificate and key.
[certificates] etcd/peer serving cert is signed for DNS names [vps604805.ovh.net localhost] and IPs [51.75.201.75 127.0.0.1 ::1]
[certificates] Generated apiserver-etcd-client certificate and key.
[certificates] Generated etcd/server certificate and key.
[certificates] etcd/server serving cert is signed for DNS names [vps604805.ovh.net localhost] and IPs [127.0.0.1 ::1]
[certificates] Generated etcd/healthcheck-client certificate and key.
[certificates] Generated ca certificate and key.
[certificates] Generated apiserver certificate and key.
[certificates] apiserver serving cert is signed for DNS names [vps604805.ovh.net kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 51.75.201.75]
[certificates] Generated apiserver-kubelet-client certificate and key.
[certificates] valid certificates and keys now exist in "/etc/kubernetes/pki"
[certificates] Generated sa key and public key.
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/admin.conf"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/kubelet.conf"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/controller-manager.conf"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/scheduler.conf"
[controlplane] wrote Static Pod manifest for component kube-apiserver to "/etc/kubernetes/manifests/kube-apiserver.yaml"
[controlplane] wrote Static Pod manifest for component kube-controller-manager to "/etc/kubernetes/manifests/kube-controller-manager.yaml"
[controlplane] wrote Static Pod manifest for component kube-scheduler to "/etc/kubernetes/manifests/kube-scheduler.yaml"
[etcd] Wrote Static Pod manifest for a local etcd instance to "/etc/kubernetes/manifests/etcd.yaml"
[init] waiting for the kubelet to boot up the control plane as Static Pods from directory "/etc/kubernetes/manifests" 
[init] this might take a minute or longer if the control plane images have to be pulled
[apiclient] All control plane components are healthy after 26.003496 seconds
[uploadconfig] storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[kubelet] Creating a ConfigMap "kubelet-config-1.12" in namespace kube-system with the configuration for the kubelets in the cluster
[markmaster] Marking the node vps604805.ovh.net as master by adding the label "node-role.kubernetes.io/master=''"
[markmaster] Marking the node vps604805.ovh.net as master by adding the taints [node-role.kubernetes.io/master:NoSchedule]
error marking master: timed out waiting for the condition

根据 Linux Foundation course，我不需要更多的命令来在我的 VM 中创建我的第一个启动集群。

错误的？

Firewalld 确实有进入防火墙的开放端口。6443/tcp 和 10248-10252

Answer 1

我建议按照官方文档中的指导引导 Kubernetes 集群。我已经进行了一些步骤，在相同的 CentOS 版本上构建集群CentOS Linux release 7.5.1804 (Core)，并将它们与您分享，希望可以帮助您解决安装过程中的问题。

首先擦除您当前的集群安装：

# kubeadm reset -f && rm -rf /etc/kubernetes/

添加Kubernetes回购进一步kubeadm，kubelet，kubectl安装：

[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
exclude=kube*
EOF

检查是否SELinux处于许可模式：

# getenforce
Permissive

确保net.bridge.bridge-nf-call-iptables在您的 sysctl 中设置为 1：

# cat <<EOF >  /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system

安装所需的 Kubernetes 组件并启动服务：

# yum update && yum upgrade && yum install -y docker kubelet kubeadm kubectl --disableexcludes=kubernetes

# systemctl start docker kubelet && systemctl enable docker kubelet

通过kubeadm以下方式部署集群：

kubeadm init --pod-network-cidr=10.244.0.0/16

我更喜欢在我的集群中Flannel作为主安装CNI，尽管正确安装Pod 网络有一些先决条件，但我已经将--pod-network-cidr=10.244.0.0/16标志传递给kubeadm init命令。

为您的用户创建 Kubernetes 主目录并存储config文件：

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

安装 Pod 网络，在我的情况下是Flannel：

$ kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/bc79dd1505b0c8681ece4de4c0d86c5cd2643275/Documentation/kube-flannel.yml

最后检查 Kubernetes 核心 Pod 状态：

$ kubectl get pods --all-namespaces

NAMESPACE     NAME                                 READY   STATUS    RESTARTS   AGE
kube-system   coredns-576cbf47c7-4x7zq             1/1     Running   0          36m
kube-system   coredns-576cbf47c7-666jm             1/1     Running   0          36m
kube-system   etcd-centos-7-5                      1/1     Running   0          35m
kube-system   kube-apiserver-centos-7-5            1/1     Running   0          35m
kube-system   kube-controller-manager-centos-7-5   1/1     Running   0          35m
kube-system   kube-flannel-ds-amd64-2bmw9          1/1     Running   0          33m
kube-system   kube-proxy-pcgw8                     1/1     Running   0          36m
kube-system   kube-scheduler-centos-7-5            1/1     Running   0          35m

如果您仍有任何疑问，请在此答案下方写下评论。