调试 kubelet 未启动

Question 1

发现与此相关的一个问题：https://github.com/kubernetes/kubernetes/issues/53333

遵循前面的答案对我有用，但没有链接问题中提供的解决方案。

因此，也许按照他们的建议编辑 90-kubeadm.conf（代替 10-kubeadm.conf）会有效

Answer

发现与此相关的一个问题：https://github.com/kubernetes/kubernetes/issues/53333

遵循前面的答案对我有用，但没有链接问题中提供的解决方案。

因此，也许按照他们的建议编辑 90-kubeadm.conf（代替 10-kubeadm.conf）会有效

Question 2

通过在 systemd 脚本中进行设置解决了问题--fail-swap-on=false。只需对文件进行修改即可/etc/systemd/system/kubelet.service.d/10-kubeadm.conf

Environment="KUBELET_SYSTEM_PODS_ARGS=--pod-manifest-path=/etc/kubernetes/manifests --allow-privileged=true --fail-swap-on=false"

systemctl daemon-reload然后运行systemctl restart kubelet

Answer

通过在 systemd 脚本中进行设置解决了问题--fail-swap-on=false。只需对文件进行修改即可/etc/systemd/system/kubelet.service.d/10-kubeadm.conf

Environment="KUBELET_SYSTEM_PODS_ARGS=--pod-manifest-path=/etc/kubernetes/manifests --allow-privileged=true --fail-swap-on=false"

systemctl daemon-reload然后运行systemctl restart kubelet

Question 3

我在 Fedora 30、kubelet 1.15.3、docker-ce 19.03.1 上遇到了同样的问题，并且输出systemctl status kubelet与您的情况相同：

Drop-In: /etc/systemd/system/kubelet.service.d
           └─10-kubeadm.conf

解决的步骤如下：1.检查以下路径上是否有文件 kubelet.service 和 10-kubeadm.conf：

ls /usr/lib/systemd/system/kubelet.service.d/10-kubeadm.conf
ls /usr/lib/systemd/system/kubelet.service

10-kubeadm.conf：

more /usr/lib/systemd/system/kubelet.service.d/10-kubeadm.conf 

# Note: This dropin only works with kubeadm and kubelet v1.11+
[Service]
Environment="KUBELET_KUBECONFIG_ARGS=--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf"
Environment="KUBELET_CONFIG_ARGS=--config=/var/lib/kubelet/config.yaml"
# This is a file that "kubeadm init" and "kubeadm join" generates at runtime, populating the KUBELET_KUBEADM_ARGS variable dynamically
EnvironmentFile=-/var/lib/kubelet/kubeadm-flags.env
# This is a file that the user can use for overrides of the kubelet args as a last resort. Preferably, the user should use
# the .NodeRegistration.KubeletExtraArgs object in the configuration files instead. KUBELET_EXTRA_ARGS should be sourced from this file.
EnvironmentFile=-/etc/sysconfig/kubelet
ExecStart=
ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_KUBEADM_ARGS $KUBELET_EXTRA_ARGS

kubelet.服务：

more /usr/lib/systemd/system/kubelet.service

[Unit]
Description=Kubernetes Kubelet Server
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=docker.service
Requires=docker.service

[Service]
WorkingDirectory=/var/lib/kubelet
EnvironmentFile=-/etc/kubernetes/config
EnvironmentFile=-/etc/kubernetes/kubelet
ExecStart=/usr/bin/kubelet \
        $KUBE_LOGTOSTDERR \
        $KUBE_LOG_LEVEL \
        $KUBELET_API_SERVER \
        $KUBELET_ADDRESS \
        $KUBELET_PORT \
        $KUBELET_HOSTNAME \
        $KUBE_ALLOW_PRIV \
        $KUBELET_ARGS
Restart=on-failure
KillMode=process

[Install]
WantedBy=multi-user.target

在 /etc/systemd/system/ 中删除 kubelet 的 systemd 单元

rm -R /etc/systemd/system/kubelet.service.d (confirm "y" for each file)
rm /etc/systemd/system/kubelet.service

重新加载所有 systemd 单元文件，并重新创建整个依赖树。

systemctl daemon-reload
重启 kubelet

systemctl restart kubelet

kubelet status 的输出应该包含：

  Loaded: loaded (/usr/lib/systemd/system/kubelet.service; enabled; vendor preset: disabled)
  Drop-In: /usr/lib/systemd/system/kubelet.service.d
           └─10-kubeadm.conf

初始化 Kubernetes 控制平面节点：

kubeadm reset
systemctl daemon-reload
kubeadm init --pod-network-cidr=10.244.0.0/16

注意：您有一个或多个问题：

`- There is no internet connection; so the kubelet can't pull the following control plane images:`

尝试手动拉取它们：

kubeadm config images pull

您可能需要升级 kubeadm、kubelet、kebectl

Answer