K8s: 关于Kubernetes中的Pod的创建，实现原理，Job调度pod以及pod网络

2024-04-19 15:43:01

现在创建一个 nginx 的 pod, 创建一个文件: my-nginx.yaml

apiVersion: v1
kind: Pod
metadata:
  name: my-nginx
  labels:
    name: my-nginx
spec:
  containers:
  - name: my-nginx
    image: nginx:latest
    resources:
        limits:
            memory: "128Mi"
            cpu: "500m"
    ports:
    - containerPort: 80

$ kubectl create -f my-nginx.yaml

pod/my-nginx created

$ kubectl get po

NAME       READY   STATUS              RESTARTS   AGE
my-nginx   0/1     ContainerCreating   0          6s

$ kubectl describe pod my-nginx

Name:         my-nginx
Namespace:    default
Priority:     0
Node:         node1.k8s/10.211.55.11
Start Time:   Thu, 18 Apr 2024 09:49:12 +0800
Labels:       name=my-nginx
Annotations:  <none>
Status:       Running
IP:           10.244.1.12
IPs:
  IP:  10.244.1.12
Containers:
  my-nginx:
    Container ID:   docker://2c73c0faa3aa91a72849fdaa1aa09cbca1ce3c6ef2092e2542fc7558d3b524a3
    Image:          nginx
    Image ID:       docker-pullable://nginx@sha256:d2cb0992f098fb075674730da5e1c6cccdd4890516e448a1db96e0245c1b7fca
    Port:           80/TCP
    Host Port:      0/TCP
    State:          Running
      Started:      Thu, 18 Apr 2024 09:49:23 +0800
    Ready:          True
    Restart Count:  0
    Limits:
      cpu:     500m
      memory:  128Mi
    Requests:
      cpu:        500m
      memory:     128Mi
    Environment:  <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-kpmzn (ro)
Conditions:
  Type              Status
  Initialized       True
  Ready             True
  ContainersReady   True
  PodScheduled      True
Volumes:
  kube-api-access-kpmzn:
    Type:                    Projected (a volume that contains injected data from multiple sources)
    TokenExpirationSeconds:  3607
    ConfigMapName:           kube-root-ca.crt
    ConfigMapOptional:       <nil>
    DownwardAPI:             true
QoS Class:                   Guaranteed
Node-Selectors:              <none>
Tolerations:                 node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
                             node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
Events:
  Type    Reason     Age   From               Message
  ----    ------     ----  ----               -------
  Normal  Scheduled  13s   default-scheduler  Successfully assigned default/my-nginx to node1.k8s
  Normal  Pulling    13s   kubelet            Pulling image "nginx"
  Normal  Pulled     2s    kubelet            Successfully pulled image "nginx" in 10.625690431s
  Normal  Created    2s    kubelet            Created container my-nginx
  Normal  Started    2s    kubelet            Started container my-nginx

这里可以看到：
- Successfully assigned default/my-nginx to node1.k8s
- 这里将pod分配到 node1.k8s 节点上

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