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Health Check

Last updated: 2021-01-27 15:06:22

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Overview

The cluster health check feature is a service provided by Tencent Kubernetes Engine (TKE) for checking the status and health of each resource in a cluster. The resulting check report displays the detailed status and configuration of components, nodes, workloads, and other check items. If an exception is detected, this feature can describe the exception in detail, automatically analyze the severity, cause, and impact, and propose rectification suggestions.

Note：
During the health check, namespace tke-cluster-inspection will be automatically created in your cluster, and a Daemonset will be installed to collect node information. Both objects will be automatically deleted after the health check is completed.

Main Check Items

Check Category	Check Item	Check Content	Self-Deployed Clusters Only
Resource status	kube-apiserver status	Check whether the component is running. If the component runs as a pod, the health check feature checks whether it has restarted over the past 24 hours	Yes
	kube-scheduler status		Yes
	kube-controller-manager status		Yes
	etcd status		Yes
	kubelet status		No
	kube-proxy status		No
	dockerd status		No
	Master node status	Check whether the node status is Ready and free of any other exceptions, such as insufficient memory and insufficient disk space	Yes
	Worker node status	Check whether the node status is Ready and free of any other exceptions, such as insufficient memory and insufficient disk space	No
	Status of each workload	Check whether the number of currently available pods of the workload meets the expected number of pods	No
Running status	Parameter configuration of kube-apiserver	Check the following parameters based on the master node configuration: max-requests-inflight: maximum number of non-change requests running in a given period max-mutating-requests-inflight: maximum number of change requests running in a given period	Yes
	Parameter configuration of kube-scheduler	Check the following parameters based on the master node configuration: kube-api-qps: QPS of kube-apiserver resquests kube-api-burst: maximum burst value during communication with kube-apiserver	Yes
	Parameter configuration of kube-controller-manager	Check the following parameters based on the master node configuration: kube-api-qps: QPS of kube-apiserver requests kube-api-burst: maximum burst value during communication with kube-apiserver	Yes
	Parameter configuration of etcd	Check the following parameter based on the master node configuration: quota-backend-bytes: storage capacity	Yes
	Reasonability of the master node configuration	Check whether the current master node configuration is sufficient to the current cluster scale	Yes
	High availability of nodes	Check whether the current cluster is a single-node cluster. Check whether current cluster nodes support multi-AZ disaster recovery That is, the health check feature checks whether the total number of resources in other availability zones is sufficient to the current cluster business scale in the event that one availability zone becomes unavailable	No
	Request and Limit configuration of workloads	Check whether workloads have configured resource-limiting containers. Configuring resource limits helps improve resource planning, pod scheduling, cluster availability, and other functions	No
	Anti-affinity configuration of workloads	Check whether workloads have configured affinity or anti-affinity. Configuring anti-affinity helps improve the high availability of business	No
	PDB configuration of workloads	Check whether workloads have configured PDB, which can help prevent your business from becoming unavailable due to eviction.	No
	Health check configuration of workloads	Check whether a health check is configured for workloads. Health check helps detect business exceptions	No
	HPA-IP configuration	Check whether the current number of remaining pod IP addresses in the cluster meets the maximum number for HPA scale-out	No

Directions

Log in to the Tencent Kubernetes Engine console and choose Cluster OPS > Health Check in the left sidebar.
On the Health Check page that appears, select the health check mode for the cluster.
In the Health Check page, there’re three options: Batch Check, Check Now, and Auto Check.
- Batch Check: simultaneously checks multiple clusters.
- Check Now: checks only one cluster.
- Auto Check: enables periodic health check for the cluster.
  
  In the Auto-Checking Settings window that appears, you can enable/disable auto-check, and set the check period and time based on your needs.
When the health check starts, you can view the check progress.
After the check is completed, you can click View Check Result to view the check report.

On the check report page, click Resource Status and Running Status tab to view resource statuses and exceptions respectively. Click Check Contents to view the detailed check contents. Click Exceptions to view the exception severity, descriptions, causes, impacts, and rectification suggestions.