如何停止Kubernetes控制飞机吊舱? [英] How can I stop Kubernetes control plane pods?

问题描述

只是好奇，对于mesos，我习惯于做systemctl stop mesos-master和systemctl start mesos-master(如果我出于某些原因需要将其弹起).使用k8s，可以在控制平面中停止"多个组件，例如apiserver，controller-manager等.

在使用kubeadm创建集群时，它会像Pod一样运行控制平面(没有副本集或类似的设置，也许是因为目前我只有一个主服务器).

在不破坏集群的情况下停止控制平面中的东西然后再次启动它们的最佳方法是什么?

解决方案

Kubernetes控制平面Pod通常部署为

要临时禁用/启用这些Pod，只需将定义文件移至安全位置并再次返回:

$ mv /etc/kubelet.d/*.yaml /tmp   # Disable static pods
$ mv /tmp/*.yaml /etc/kubelet.d   # Re-enable static pods

Just curious, with mesos I'm used to being able to do systemctl stop mesos-master and systemctl start mesos-master (if I need to bounce it for some reason). With k8s, there are multiple components to 'stop' in the control plane, such as apiserver, controller-manager, etc.

When creating a cluster with kubeadm, it runs the control plane as pods (no replica set, or anything like that, perhaps because I only have a single master at the moment).

What's the best way to stop the things in the control plane and then start them again, without tearing down the cluster?

解决方案

The Kubernetes control plane pods are often deployed as Static Pods. These are not managed by any kind of Deployment controller, but are defined in static (hence the name) configuration files that are placed in a configuration directory (like for example /etc/kubelet.d/ or /etc/kubernetes/manifests, depending on how your cluster is set up). These definition files are picked up by the Kubelet running on the Kubernetes master node that creates the respective pods.

According to the documentation, you can stop/delete static pods simply by removing the respective configuration files, and start/create them again by creating new files:

Running kubelet periodically scans the configured directory (/etc/kubelet.d in our example) for changes and adds/removes pods as files appear/disappear in this directory.

[joe@my-node1 ~] $ mv /etc/kubelet.d/static-web.yaml /tmp
[joe@my-node1 ~] $ sleep 20
[joe@my-node1 ~] $ docker ps
// no nginx container is running
[joe@my-node1 ~] $ mv /tmp/static-web.yaml  /etc/kubelet.d/
[joe@my-node1 ~] $ sleep 20
[joe@my-node1 ~] $ docker ps
CONTAINER ID        IMAGE         COMMAND                CREATED           ...
e7a62e3427f1        nginx:latest  "nginx -g 'daemon of   27 seconds ago

To temporarily disable/enable these pods, simply move the definition files to a safe location and back again:

$ mv /etc/kubelet.d/*.yaml /tmp   # Disable static pods
$ mv /tmp/*.yaml /etc/kubelet.d   # Re-enable static pods

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