Shulou(Shulou.com)06/03 Report--

Pod features k8s minimum snap-in A collection of containers a container sharing network command space in Pod Pod is a short-lived Pod container classification

1.infrastructure container basic container (maintains the entire Pod cyberspace)

Node node operation # View the container's network cat / opt/kubernetes/cfg/kubelet# is created every time the Pod is created. Corresponding to the Pod, it is transparent to the user, and the network component is automatically loaded as a component and provided to the docker ps.

2.initcontainers initializes the container

When pod is created, the initialization initcontainers must be performed. In the old version, there is no distinction between before and after execution (the smaller the number of PID number is, the higher the priority is, and the more it is started first). With the improvement of the cloud platform, the startup mode is changed to host mode, and the separated initialization containers will be loaded first, and only after the initialization containers have been loaded can the business containers continue to run normally.

3.container business container, starting in parallel

Example:

Init containers in use

This example defines a simple Pod that has two init containers. The first waits for myservice, and the second waits for mydb. Once both init containers complete, the Pod runs the app container from its spec section.apiVersion: v1kind: Podmetadata: name: myapp-pod labels: app: myappspec: containers:-name: myapp-container image: busybox:1.28 command: ['sh','-caches, 'echo The app is running! & & sleep 3600'] initContainers:-name: init-myservice image: busybox:1.28 command: [' sh','- cations, 'until nslookup myservice; do echo waiting for myservice Sleep 2; done;']-name: init-mydb image: busybox:1.28 command: ['sh','-caches, 'until nslookup mydb; do echo waiting for mydb; sleep 2; done;'] Image pull policy (image PullPolicy) IfNotPresent: default. Pull Always only if the image does not exist on the host: pull the image again every time Pod is created. Never:Pod will never actively pull this image.

Example:

Verify by creating a pod that uses a private image, e.g.:kubectl apply-f-

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.