kubernetes-pod指定调度

kubernetes-pod指定调度

参考文档

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https://kubernetes.io/zh-cn/docs/concepts/scheduling-eviction/assign-pod-node/

使用nodeName指定调度

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调度到kubernetes-node2
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# 编写yaml文件
[root@kubernetes-master study]# cat pod-nginx-node2.yml 
---
apiVersion: v1
kind: Namespace                 # 创建资源为Namespace
metadata:
  name: my-namespace            #创建命名空间为my-namespace
---
apiVersion: v1
kind: Pod                       # 创建资源为Pod
metadata:
  namespace: my-namespace       # 指定pod的所在空间为my-namespace
  name: my-nginx                # pod名
spec:
  nodeName: kubernetes-node2    # 指定pod在node2上面创建
  containers:
    - name: my-nginx-web        # 容器名
      image: daocloud.io/library/nginx  #容器镜像
      ports: 
        - containerPort: 80     # 容器暴漏端口

image-20231107134828726

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# 创建pod
[root@kubernetes-master study]# kubectl  apply  -f pod-nginx-node2.yml 
namespace/my-namespace unchanged
pod/my-nginx created

# 查看pod信息
[root@kubernetes-master study]# kubectl  get pod  -n my-namespace 
NAME       READY   STATUS    RESTARTS   AGE
my-nginx   1/1     Running   0          5m

# 查看pod详细信息
[root@kubernetes-master study]# kubectl  get pod  -n my-namespace -o wide 
NAME       READY   STATUS    RESTARTS   AGE    IP            NODE               NOMINATED NODE   READINESS GATES
my-nginx   1/1     Running   0          5m5s   10.10.20.94   kubernetes-node2   <none>           <none>

# 查看pod创建信息
[root@kubernetes-master study]# kubectl  describe pod  -n my-namespace  my-nginx 
Name:             my-nginx
Namespace:        my-namespace
Priority:         0
Service Account:  default
Node:             kubernetes-node2/10.10.10.23
Start Time:       Tue, 07 Nov 2023 13:44:13 +0800
Labels:           <none>
Annotations:      cni.projectcalico.org/containerID: b85537817d8aa34f290285bc0386a8bcf893ca5cef0634a63ec83cf0434458dd
                  cni.projectcalico.org/podIP: 10.10.20.94/32
                  cni.projectcalico.org/podIPs: 10.10.20.94/32
Status:           Running
IP:               10.10.20.94
IPs:
  IP:  10.10.20.94
Containers:
  my-nginx-web:
    Container ID:   docker://42d4eb299157614b733a9c3408d8ed2e106041292a60832c1ac27a85c44a075f
    Image:          daocloud.io/library/nginx
    Image ID:       docker-pullable://daocloud.io/library/nginx@sha256:1a53eb723d17523512bd25c27299046cfa034cce309f4ed330c943a304513f59
    Port:           80/TCP
    Host Port:      0/TCP
    State:          Running
      Started:      Tue, 07 Nov 2023 13:44:44 +0800
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-fdzzt (ro)
Conditions:
  Type              Status
  Initialized       True 
  Ready             True 
  ContainersReady   True 
  PodScheduled      True 
Volumes:
  kube-api-access-fdzzt:
    Type:                    Projected (a volume that contains injected data from multiple sources)
    TokenExpirationSeconds:  3607
    ConfigMapName:           kube-root-ca.crt
    ConfigMapOptional:       <nil>
    DownwardAPI:             true
QoS Class:                   BestEffort
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  Pulling  6m7s   kubelet  Pulling image "daocloud.io/library/nginx"
  Normal  Pulled   5m38s  kubelet  Successfully pulled image "daocloud.io/library/nginx" in 29.670915109s (29.670934718s including waiting)
  Normal  Created  5m37s  kubelet  Created container my-nginx-web
  Normal  Started  5m37s  kubelet  Started container my-nginx-web

image-20231107135411339

image-20231107135439527

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# 删除此yaml文件创建的，namespace及pod
[root@kubernetes-master study]# kubectl  delete  -f pod-nginx-node2.yml 
namespace "my-namespace" deleted
pod "my-nginx" deleted

使用node标签指定调度

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调度到kubernetes-node1
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# 查看node1的标签
[root@kubernetes-master study]# kubectl  describe nodes kubernetes-node1 
Name:               kubernetes-node1
Roles:              <none>
Labels:             beta.kubernetes.io/arch=amd64
                    beta.kubernetes.io/os=linux
                    kubernetes.io/arch=amd64
                    kubernetes.io/hostname=kubernetes-node1             #此处为标签
                    kubernetes.io/os=linux
Annotations:        csi.volume.kubernetes.io/nodeid: {"csi.tigera.io":"kubernetes-node1"}
                    kubeadm.alpha.kubernetes.io/cri-socket: unix:///var/run/cri-dockerd.sock
                    node.alpha.kubernetes.io/ttl: 0
                    projectcalico.org/IPv4Address: 10.10.10.22/24
                    projectcalico.org/IPv4VXLANTunnelAddr: 10.10.20.192
                    volumes.kubernetes.io/controller-managed-attach-detach: true
CreationTimestamp:  Thu, 02 Nov 2023 15:10:30 +0800
Taints:             <none>

image-20231107140053830

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# 查看node2
[root@kubernetes-master study]# kubectl  describe nodes kubernetes-node2

image-20231107140311964

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# 创建tomcat.yaml
[root@kubernetes-master study]# cat tomcat.yaml
---
apiVersion: v1                      # yaml版本
kind: Namespace                     # 创建资源对象为命名空间
metadata:                           # 元数据
  name: my-tomcat                   # 命名空间名为 my-tomcat
---
apiVersion: v1
kind: Pod                           # 创建资源对象为pod
metadata:                           # 元数据
  namespace: my-tomcat              # 指定pod所在命名空间为 my-tomcat
  name: tomcat                      # pod名为 tomcat
  labels:                           # 标签
    api: tomcat                     # 标签为 api: tomcat
spec:                               # 容器属性
  nodeSelector:                     # 指定使用 nodeSelector 方式调度
    kubernetes.io/hostname: kubernetes-node1    #调度pod在 kubernetes.io/hostname: kubernetes-node1 的标签nodo节点上创建
  containers:                       # 定义容器
    - name: my-tomcat-api           # 容器名为 my-tomcat-api
      image: daocloud.io/library/tomcat # 镜像
      ports:                        # 容器暴漏端口
        - containerPort: 8080       # 8080

image-20231107143021153

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# 创建pod
[root@kubernetes-master study]# kubectl  apply -f tomcat.yaml  
namespace/my-tomcat created
pod/tomcat created

# 查看pod信息
[root@kubernetes-master study]# kubectl  get pod  -n my-tomcat  -o wide 
NAME     READY   STATUS    RESTARTS   AGE     IP             NODE               NOMINATED NODE   READINESS GATES
tomcat   1/1     Running   0          3m54s   10.10.20.235   kubernetes-node1   <none>           <none>

# 查看创建pod详细信息
[root@kubernetes-master study]#  kubectl  describe pod   -n my-tomcat

image-20231107143737064

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# 删除此yaml文件创建的，namespace及pod
[root@kubernetes-master study]# kubectl  delete  -f tomcat.yaml 
namespace "my-namespace" deleted
pod "my-tomcat" deleted