Detailed explanation of kubernetes (VI) -- pod object deployment and Application

Today I will continue to introduce Linux Operation and maintenance related knowledge , The main content of this paper is Pod Object deployment and application .
In the foreword Kubernetes Detailed explanation （ Four ）—— be based on kubeadm Of Kubernetes Deploy in , We introduced Kubernetes Cluster installation and deployment . Next , We will use it Kubernetes colony , To achieve Pod Object creation 、 see 、 Access and delete .

One 、Pod Resource creation

Pod The format of the command to create a resource object is ：

kubectl run 【Pod name 】 --image=【Pod The image name used 】 --port=【Pod The port on which the object runs 】 --replicas=【 Created Pod Number of copies of object 】

for example , Carry out orders ：

kubectl run pod-test --image=nginx:1.12 --port=80 --replicas=1

You can open a mirror , The results are as follows ：

such ,Pod The object is created successfully ！

Two 、Pod Resource view

Pod After the resource object is created successfully , We carry out orders ：

kubectl get deployment

or

kubectl get pods

You can see Pod Information about , The execution results of these two commands are as follows ：


Based on these two commands , add -o wide Parameters , You can see the Pod Object details , The order is as follows ：

kubectl get deployment -o wide

kubectl get pods -o wide

The execution results of these two commands are as follows ：


In the result of the above command execution ,NAME yes Pod The name of the object , This name is prefixed with the name we are creating Pod The name specified when the object , Followed by a random number ;READY Is the number of ready , The number before the slash is the number of containers ready , The number after the slash is the Pod The total number of containers in the container ;STATUS Indicates the running state of the container ;RESTART Indicates the number of restarts of the container ;AGE Indicates the running time of the container ;IP Indicates the of the container IP Address ;NODE It means that we should Pod The node ;IMAGES It means that we should Pod The mirror image used ;SELECTION It means that we should Pod The label of ;

3、 ... and 、Pod Access to resources

Pod After the resource is created , We can access the Pod resources . We are Pod When viewing objects , You can see that Pod Resources IP Address .
We use curl You can visit the Pod resources , The results are as follows ：

Be careful ：
stay Kubernetes In the cluster , Just as it should be Pod Running on the Node2 On , But it can be implemented on any node Pod The interview of .

Four 、Pod Node delete

If we want to delete Pod node , The command format is ：

kubectl delete pods 【Pod name 】

The execution result of this command is as follows ：

Be careful , stay Kubernetes In the cluster , Because of the Pod By Controller Controlled by the controller , So although we can delete this Pod object , however Controller The controller is created again Pod object .
Originality is not easy. , Reprint please explain the source ：https://blog.csdn.net/weixin_40228200