Kubeadm 初始化问题

Question

Kubeadm 初始化问题。

配置数据版本：

os -rhel7.5
env -onprem server
docker - 19
kube - 18

控制台 output：

[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.
[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.

出了什么问题以及如何解决？

Answer 1

根据您提供的信息，可以在此处完成几件事。

首先你可以检查一下 docker 的原生 cgroupdriver 和 kubelet 是否一致。 您可以通过运行以下命令查看 kubelet 的配置：

cat /var/lib/kubelet/kubeadm-flags.env 

要检查 docker 配置，您可以简单地使用：

docker info | grep Cgroup

如果你需要改变它，你可以这样做：

cat << EOF > /etc/docker/daemon.json
{
  "exec-opts": ["native.cgroupdriver=systemd"]
}
EOF

要更改 kubelet cgroup 驱动程序，您必须：

`vi /etc/systemd/system/kubelet.service.d/10-kubeadm.conf`

并更新KUBELET_CGROUP_ARGS=--cgroup-driver=<systemd or cgroupfs>

第二种可能的解决方案可能是禁用交换。 您可以使用以下命令执行此操作：

sudo swapoff -a
sudo sed -i '/ swap / s/^/#/' /etc/fstab

之后重新启动机器，然后执行kubeadm reset并尝试使用kubeadm init初始化集群。