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[kubernetes series] pod chapter actual operation

2022-06-13 04:00:00 【Python's path to becoming a God】

Catalog

One 、 Command terminal
Two 、Dashboard

One 、 Command terminal

establish Pod

Command format kubectl run Customize pod name --image= base image
Example

[[email protected] kubernetes]# kubectl run my-nginx --image=nginx
pod/my-nginx created

see Pod

Simple status information

[[email protected] ~]# kubectl get pod -n default
NAME       READY   STATUS    RESTARTS   AGE
my-nginx   1/1     Running   0          15s

Pod Details
Command format kubectl get pod podName -owide

[[email protected] ~]# kubectl get pod my-nginx -owide
NAME       READY   STATUS    RESTARTS   AGE     IP           NODE            NOMINATED NODE   READINESS GATES
my-nginx   1/1     Running   0          2m30s   10.244.0.9   vm-4-8-centos   <none>           <none>

Execution process description
Command format kubectl describe pod podName

[[email protected] ~]# kubectl describe pod my-nginx
Name:         my-nginx
Namespace:    default
Priority:     0
Node:         vm-4-8-centos/10.0.4.8
Start Time:   Sat, 26 Feb 2022 11:25:56 +0800
Labels:       run=my-nginx
Annotations:  <none>
...
Events:
  Type    Reason     Age    From               Message
  ----    ------     ----   ----               -------
  Normal  Scheduled  3m41s  default-scheduler  Successfully assigned default/my-nginx to vm-4-8-centos
  Normal  Pulling    3m41s  kubelet            Pulling image "nginx"
  Normal  Pulled     3m40s  kubelet            Successfully pulled image "nginx" in 882.15599ms
  Normal  Created    3m40s  kubelet            Created container my-nginx
  Normal  Started    3m40s  kubelet            Started container my-nginx

Log information
Command format kubectl logs podName

[[email protected] ~]# kubectl logs my-nginx
/docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration
/docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/
/docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh
...
2022/02/26 03:25:57 [notice] 1#1: getrlimit(RLIMIT_NOFILE): 1048576:1048576
2022/02/26 03:25:57 [notice] 1#1: start worker processes
2022/02/26 03:25:57 [notice] 1#1: start worker process 31
2022/02/26 03:25:57 [notice] 1#1: start worker process 32

visit Pod Medium container

adopt kubectl get pod podName -owide Can get pod Of IP Address , Then you can access Pod Container process in ;

[[email protected] ~]# curl http://10.244.0.9
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
...
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

Get into Pod Inside

Command format ：kubectl exec -it podName -- /bin/bash

[[email protected] ~]# kubectl exec -it my-nginx -- /bin/bash

modify Nginx Content , Revisit

[email protected]:/# cd /usr/share/nginx/html/
[email protected]:/usr/share/nginx/html# ll
bash: ll: command not found
[email protected]:/usr/share/nginx/html# ls
50x.html  index.html
[email protected]:/usr/share/nginx/html# echo "welcome my nginx pod" > index.html

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Delete Pod

Command format :kubectl delete pod Pod name -n Specify the namespace

[[email protected] kubernetes]# kubectl delete pod my-nginx -n default
pod "my-nginx" deleted

The configuration file yaml establish

newly build vi pod-demo.yaml

#  The contents are as follows  
apiVersion: v1
kind: Pod #  The resource type ,Pod
metadata: #  Metadata 
  name: nginx01 # Pod Custom name 
  namespace: default #  Namespace 
  labels: #  label 
    run: nginx01
spec: #  Configuration information 
  containers: #  Container group 
  - name: nginx01 #  Container name 
    image: nginx #  Specify the name of the underlying image or the warehouse connection

Application profile

[[email protected] kubernetes]# kubectl apply -f pod-demo.yaml

Delete the... Created by the configuration file Pod
Delete the configuration file at the same time , Delete... Together Pod

[[email protected] kubernetes]# kubectl delete -f pod-demo.yaml

Two 、Dashboard

establish Pod

Select in default namespace=default New China Pod, Select... In the control panel yaml Format file creation , The content is the same as the command terminal creation format ;

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Pod You can view the contents in the menu

Other operations will not be introduced in detail , I believe we can manage the graphical interface ~
Study Pod When , It should be clear to everyone that ,Pod It's a container group , It can contain multiple containers , So let's create a multi container Pod;

Create multi container Pod

newly added Tomcat Containers

apiVersion: v1
kind: Pod #  The resource type ,Pod
metadata: #  Metadata 
  name: pod-demo1 # Pod Custom name 
  namespace: default #  Namespace 
  labels: #  label 
    run: pod-demo1
spec: #  Configuration information 
  containers: #  Container group 
  - name: nginx #  Container name 
    image: nginx #  Specify the name of the underlying image or the warehouse connection 
  - name: tomcat
    image: tomcat:8.5.68

After uploading , You can see our pod Already run
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Into the container

pod Each line of the catalog list The last three points drop-down list Choose from perform Enter the container of the operation ;
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Access container applications

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Visit separately Nginx and Tomcat;
Format podIP+ Container port

[[email protected] ~]# kubectl get pod pod-demo1 -owide
NAME        READY   STATUS    RESTARTS   AGE     IP            NODE            NOMINATED NODE   READINESS GATES
pod-demo1   2/2     Running   0          9m37s   10.244.0.11   vm-4-8-centos   <none>           <none>
[[email protected] ~]# curl http://10.244.0.11
hello nginx
[[email protected] ~]# curl http://10.244.0.11:8080
<!doctype html><html lang="en"><head><title>HTTP Status 404 – Not Found</title><style type="text/css">body { 
    font-family:Tahoma,Arial,sans-serif;} h1, h2, h3, b { 
    color:white;background-color:#525D76;} h1 {font-size:22px;} h2 {font-size:16px;} h3 {font-size:14px;} p {font-size:12px;} a {color:black;} .line {height:1px;background-color:#525D76;border:none;}</style></head><body><h1>HTTP Status 404 – Not Found</h1><hr class="line" /><p><b>Type</b> Status Report</p><p><b>Description</b> The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.</p><hr class="line" /><h3>Apache Tomcat/8.5.68</h3></body></html>[[email protected] ~]#