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

Original articles, welcome to reprint. Reprint please indicate: reproduced from IT Story Association, thank you!

Original link address: "Advanced article" kubernetes basic cluster command of docker (35)

Now let's try how to operate and control it. Let's start with the simplest command and try the official introduction to kubernetes: the content of playground. Learn how to create a pod,deployments and view their information to gain a deeper understanding of their relationship. Source code: https://github.com/limingios/msA-docker K8s branch and https://github.com/limingios/kubernetes-starter basic cluster construction view sections 32 to 34

Kubernetes contact Command kubectl version

View version

Kubectl get nodes

View nodes

Kubectl get pods

View pods

Pull the official image

The memory is a little low and slow.

Kubectl run kubernetes-bootcamp-- image=jocatalin/kubernetes-bootcamp:v1-- port=8080! [] (https://upload-images.jianshu.io/upload_images/11223715-e83d0671839f03b9.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)- to view the details of deploy ```bashkubectl describe deploy kubernetes-bootcamp

View the details of pods

Kubectl describe pods kubernetes-bootcamp-6b7849c495-xmmvh

How to access port 8080 just now, because it is on that machine, and it can be accessed by apiserver.

Start 2 windows and one window to start the agent command

Kubectl proxy

Then manipulate another window

Curl http://localhost:8001/api/v1/proxy/namespaces/default/pods/kubernetes-bootcamp-6b7849c495-xmmvh/

Expansion and reduction of capacity

K8s will use the machine evenly, and there will not be a situation where a machine uses too much and a machine uses very little.

# if you need to change from 2 to 1, you can also use this command kubectl scale deploy kubernetes-bootcamp-- replicas=2# can see that an instance is running on 102and an instance kubectl get pods-o wide is running on 103rd.

Promote Mirror

Current state

Kubectl describe deploy kubernetes-bootcamp

Promote Mirror

# it turned out that v1 was upgraded to v2kubectl set image deploy kubernetes-bootcamp kubernetes-bootcamp=jocatalin/kubernetes-bootcamp:v2kubectl describe deploy kubernetes-bootcamp

Status of deploy

Kubectl rollout status deploy kubernetes-bootcamp

Roll back the mirror

Kubectl rollout undo deploy kubernetes-bootcamp# has changed back to v1, kubectl describe deploy kubernetes-bootcamp.

Delete deploy

Kubectl delete deploy kubernetes-bootcamp

Configuration file

The above uses a lot of commands, the old iron digests and absorbs, of course, it is really inconvenient to use commands to manage the cluster all the time, and it is difficult to be competent when there are a large number of applications. K8s also provides a way to manage configuration files. It's kind of similar to swarm's. There are some differences in design and function.

Yaml file to create podmkdir servicescd servicesvi nginx-pod.yaml

Nginx-pod.yaml file

ApiVersion: v1kind: Podmetadata:name: nginxspec:containers:-name: nginximage: nginx:1.7.9ports:-containerPort: 80

Command to generate pod

If you create a pod specified in the kubectl create-f nginx-pod.yaml# file, it is impossible to create a deploykubectl get deploykubectl get pods-o wide.

Start the agent to try to access nginx

The old routine, one window starts, one window curl

# ip101 launch Agent kubectl proxy#ip101 another window to access curl http://localhost:8001/api/v1/proxy/namespaces/default/pods/nginx/

Yaml file to create deploymentvi nginx-Deployment.yaml

Nginx-Deployment.yaml file

ApiVersion: apps/v1beta1kind: Deploymentmetadata:name: nginx-deploymentspec:replicas: 2template:metadata:labels:app: nginxspec:containers:- name: nginximage: nginx:1.7.9ports:- containerPort: 80

Command to generate deployment

Kubectl create-f nginx-Deployment.yamlkubectl get deploykubectl get pods-o widekubectl get pods-l app=nginxkubectl get pods-l app=nginx-o wide

PS: that's all for the usual commands. Let's talk about service and dns next time.

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.