Introduction to k8s api-resources resource type

1. View the resource cluster status in the k8s cluster environment

Enter the command=》# kubectl api-resources to  display all api resource information in the k8s cluster, parameter description:

• NAME: api resource name;
• SHORTNAMES: abbreviation of api resource name;
• APIGROUP: api group management;
• NAMESPACED: Whether namespace isolation can be used, true is true, false is not;
• KIND: api resource type;

View k8s component cluster status=》# kubectl get cs

= "[Kubeadm installs k8s component controller-manager and scheduler status Unhealthy] error:

The above Unhealthy status appears, troubleshooting ideas:

1|1. Check the local port first, and you can confirm that ports 10251 and 10252 are not activated

=》# sudo netstat -tlunp

 Or directly filter to view ports 10251 and 10252

• =》# Ss -ant | grep 10251
• =》# Ss -ant | grep 10252

1|2, confirm whether non-secure ports are disabled in the kube-scheduler and kube-controller-manager component configuration

 = "Configuration file path:

• /etc/kubernetes/manifests/kube-scheduler.conf 
• /etc/kubernetes/manifests/kube-controller-manager.conf

 = "View the corresponding ymal file:

vim /etc/kubernetes/manifests/kube-scheduler.yaml
vim /etc/kubernetes/manifests/kube-controller-manager.yaml

 = "Remove the setting of --port=0, in the red box as shown below:

1 | 3. 重启 kubelet =》# sudo systemctl restart kubelet

After restarting the service, confirm the component status, the display is normal, and enter the following command again to verify:

• View cluster monitoring port information=》# sudo netstat -tlunp
• View master component status =》# kubectl get cs

 

2. Common api resource view commands

• View master component status=》# kubectl get cs
• View node status=》# kubectl get node
• View the URL of the Apiserver proxy =》# kubectl cluster-info
• View cluster details=》# kubectl cluster-info dump 
• View resource information=》# kubeclt describe <resource> <name> 

1. View node details=》# kubectl describe node
2. View master node details=》# kubectl describe node k8s-master
3. View node node details=》# kubectl describe node k8s-node01

• View Pod resource information=》# kubectl get pod <Pod name> --watch

The role of api-server:

• Unified entrance to the cluster;
• Cooperate with other components (there are some api agents inside);

 

to sum up:

• api-resources View cluster resource type information;
• After kubeadm installs the k8s cluster, check the status of the master node components;
• A brief introduction to commonly used api-resources;