调用kubeadm init时kubeadm初始化失败

Question

我是kubernetes的新手，正在尝试配置kubernetes主节点，我已经安装了以下kubeadm、kubectl和kubelet

https://kubernetes.io/docs/setup/independent/create-cluster-kubeadm/

但是，当我试图通过输入kubeadm init来启动kubeadm时，它给出了以下错误

[init] Using Kubernetes version: v1.14.0
[preflight] Running pre-flight checks
        [WARNING Firewalld]: no supported init system detected, skipping checking for services
        [WARNING Service-Docker]: no supported init system detected, skipping checking for services
        [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 Service-Kubelet]: no supported init system detected, skipping checking for services
error execution phase preflight: [preflight] Some fatal errors occurred:
        [ERROR FileAvailable--etc-kubernetes-manifests-kube-apiserver.yaml]: /etc/kubernetes/manifests/kube-apiserver.yaml already exists
        [ERROR FileAvailable--etc-kubernetes-manifests-kube-controller-manager.yaml]: /etc/kubernetes/manifests/kube-controller-manager.yaml already exists
        [ERROR FileAvailable--etc-kubernetes-manifests-kube-scheduler.yaml]: /etc/kubernetes/manifests/kube-scheduler.yaml already exists
        [ERROR FileAvailable--etc-kubernetes-manifests-etcd.yaml]: /etc/kubernetes/manifests/etcd.yaml already exists
        [ERROR FileContent--proc-sys-net-ipv4-ip_forward]: /proc/sys/net/ipv4/ip_forward contents are not set to 1
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`

Answer 1

看起来你的系统里有陈旧的数据。要删除该数据(/etc/kubernetes)目录，请运行以下命令：

kubeadm reset

现在您需要通过以下命令将ip_forward内容设置为1：

echo 1 > /proc/sys/net/ipv4/ip_forward

这应该可以解决您的问题。

Answer 2

br_netfilter模块是kubernetes安装所必需的。启用此内核模块，以便通过网桥的数据包由iptables处理，以进行过滤和端口转发，并且跨集群的kubernetes pod可以相互通信。

运行以下命令以启用br_netfilter内核模块。

#modprobe br_netfilter


#echo '1' > /proc/sys/net/bridge/bridge-nf-call-iptables  

或

#nano /proc/sys/net/ipv4/ip_forward

您应该看到0删除0并写入1