01 - Core Concepts - Pods

學習目標

• Pods
• ReplicaSets
• Deployments
• Namespaces
• Services
• Imperative Commands

Pods

$ kubectl get pods                        

$ kubectl get pod <pod-name>     

Look for existing Pods.

$ kubectl get pods                       

NAME      READY     STATUS               RESTARTS    AGE

newpod    1 /1          Running                0                  10m

webapp    1 /2         ImagePullBackOff   0                  2m49s

READY ➜ Running Containers in Pod /Total Containers in Pod

$ kubectl get pods -o wide           

$ kubectl get pods -A -ns                  

$ kubectl describe pods                     

$ kubectl describe pod <pod-name>   

Get detailed information about most of the Kubernetes primitives, including Nodes, Pods, and Deployments.

• View what containers are inside that Pod
• View what images are used to build those containers
• Details about the Pod’s container: IP address, the ports used and a list of events related to the lifecycle of the Pod.

$ kubectl run nginx --image=nginx      

$ kubectl run redis --image redis        

Start a nginx/redis pod.

$ kubectl delete pod <pod-name>       

Delete a pod.

$ kubectl run --help

Create a pod definition YAML file and use it to create a pod.

(1) Method 1

$ kubectl run redis --image=redis123 --dry-run=client -o yaml                                   

$ kubectl run redis --image=redis123 --dry-run=client -o yaml > redis-definition.yaml  

$ kubectl create -f redis-definition.yaml                                                                   

(2) Method 2

$ vim redis-definition.yaml                               

$ kubectl apply -f redis-definition.yaml             

待補充：

$ kubectl edit pod redis