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NotReady

If a Kubernetes node is notReady, it means that the node is not able to perform its intended functions and is not available for scheduling new workloads. There are several reasons why a node may be notReady, including:

1. Network issues: If the node loses its network connectivity, it may become notReady.

2. Resource exhaustion: If the node runs out of resources like CPU or memory, it may become notReady.

3. Node failure: If the node crashes or experiences hardware failure, it may become notReady.

4. Kubernetes component failure: If a critical Kubernetes component like kubelet or kube-proxy fails on the node, it may become notReady.

To troubleshoot a notReady node, you can:

1. Check the node status using the kubectl command: kubectl get nodes

2. Check the node logs using the kubectl command: kubectl logs <node-name>

3. Check the kubelet logs on the node: /var/log/kubelet.log

4. Check the system logs on the node: /var/log/messages

5. Check the Kubernetes event logs using the kubectl command: kubectl get events

Once you identify the root cause of the notReady node, you can take appropriate actions to resolve the issue. For example, if the node is notReady due to resource exhaustion, you can add more resources or adjust the resource limits for the workloads running on the node. If the node is notReady due to network issues, you can troubleshoot the network connectivity and fix any issues.

sysstat-collect.service

/sys/fs/cgroup/memory/system.slice/sysstat-collect.service 是一个文件路径，它指向 Linux 系统中的一个 cgroup 控制组。cgroup 是 Linux 内核提供的一种机制，可以对进程进行资源限制和优先级控制，比如内存、CPU、磁盘等等。cgroup 控制组是一组相关进程的集合，可以对它们进行统一的资源管理。

在这个路径中，/sys/fs/cgroup/memory 是 cgroup 的根目录，system.slice 是一个 cgroup 控制组的名称，它是 systemd 系统管理器中的一个单元，用于管理系统进程和服务。sysstat-collect.service 是一个服务单元的名称，它是由 systemd 管理的一个后台服务，用于收集系统性能数据。

该文件路径中的具体文件或目录可能因操作系统版本、系统配置等因素而有所不同。一般情况下，这个文件路径是由系统自动生成的，用户一般不需要手动创建或修改它。