利用yaml文件管理资源

利用yaml配置文件管理资源

[root@master ~]# cat nginx-deployment.yaml apiVersion: apps/v1beta2 kind: Deployment metadata: name: nginx-deployment spec: replicas: 3 selector: matchLabels: app: nginx template: metadata: labels: app: nginx spec: containers: - name: nginx image: nginx:1.10 ports: - containerPort: 80 [root@master ~]# cat nginx-service.yaml apiVersion: v1 kind: Service metadata: name: nginx-service labels: app: nginx spec: ports: - port: 88 targetPort: 80 selector: app: nginx

执行如下命令即可发布服务

kubectl create -f nginx-deployment.yaml kubectl create -f nginx-service.yaml

查看发布的服务

[root@master ~]# kubectl get all NAME READY STATUS RESTARTS AGE pod/nginx-66d64dcdf8-89tfc 1/1 Running 0 5h21m pod/nginx-66d64dcdf8-hwfbm 1/1 Running 0 5h21m pod/nginx-66d64dcdf8-m8jfs 1/1 Running 0 5m49s pod/nginx-deployment-58d6d6ccb8-5hnzm 1/1 Running 0 10m pod/nginx-deployment-58d6d6ccb8-6wn9w 1/1 Running 0 10m pod/nginx-deployment-58d6d6ccb8-mh48n 1/1 Running 0 10m NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE service/kubernetes ClusterIP 10.10.10.1 <none> 443/TCP 46h service/nginx-service ClusterIP 10.10.10.135 <none> 88/TCP 4m7s NAME READY UP-TO-DATE AVAILABLE AGE deployment.extensions/nginx 3/3 3 3 5h21m deployment.extensions/nginx-deployment 3/3 3 3 10m NAME DESIRED CURRENT READY AGE replicaset.extensions/nginx-66d64dcdf8 3 3 3 5h21m replicaset.extensions/nginx-deployment-58d6d6ccb8 3 3 3 10m NAME READY UP-TO-DATE AVAILABLE AGE deployment.apps/nginx 3/3 3 3 5h21m deployment.apps/nginx-deployment 3/3 3 3 10m NAME DESIRED CURRENT READY AGE replicaset.apps/nginx-66d64dcdf8 3 3 3 5h21m replicaset.apps/nginx-deployment-58d6d6ccb8 3 3 3 10m

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Pod基本管理

创建一个pod：

[root@master ~]# cat pod-nginx.yaml apiVersion: v1 kind: Pod metadata: name: nginx-pod labels: app: nginx spec: containers: - name: nginx image: nginx

查看pod

[root@master ~]# kubectl describe pod nginx-pod Name: nginx-pod Namespace: default Node: 172.16.163.130/172.16.163.130 Start Time: Sat, 31 Aug 2019 09:58:34 -0400 Labels: app=nginx Annotations: <none> Status: Running IP: 172.17.76.3 Containers: nginx: Container ID: docker://248a01e3010c97ea16f9bf964472109d6050557fcbb437925b538228135525aa Image: nginx Image ID: docker-pullable://nginx@sha256:53ddb41e46de3d63376579acf46f9a41a8d7de33645db47a486de9769201fec9 Port: <none> Host Port: <none> State: Running Started: Sat, 31 Aug 2019 09:58:54 -0400 Ready: True Restart Count: 0 Environment: <none> Mounts: /var/run/secrets/kubernetes.io/serviceaccount from default-token-rmchc (ro) Conditions: Type Status Initialized True Ready True PodScheduled True Volumes: default-token-rmchc: Type: Secret (a volume populated by a Secret) SecretName: default-token-rmchc Optional: false QoS Class: BestEffort Node-Selectors: <none> Tolerations: <none> Events: Type Reason Age From Message ---- ------ ---- ---- ------- Normal Scheduled 75s default-scheduler Successfully assigned nginx-pod to 172.16.163.130 Normal SuccessfulMountVolume 75s kubelet, 172.16.163.130 MountVolume.SetUp succeeded for volume "default-token-rmchc" Normal Pulling 74s kubelet, 172.16.163.130 pulling image "nginx" Normal Pulled 56s kubelet, 172.16.163.130 Successfully pulled image "nginx" Normal Created 56s kubelet, 172.16.163.130 Created container Normal Started 55s kubelet, 172.16.163.130 Started container

pod的管理

基本管理： # 创建pod资源 kubectl create -f pod.yaml # 查看pods kubectl get pods nginx-pod # 查看pod描述 kubectl describe pod nginx-pod # 更新资源 kubectl apply -f pod.yaml # 删除资源 kubectl delete pod nginx-pod

Pod资源限制

apiVersion: v1 kind: Pod metadata: name: nginx-pod labels: app: nginx spec: containers: - name: nginx image: nginx resources: requests: memory: "64Mi" cpu: "250m" limits: memory: "128Mi" cpu: "500m"

Pod调度约束与重启策略

调度约束就是让某个应用运行在指定的节点上

apiVersion: v1 kind: Pod metadata: name: nginx-pod labels: app: nginx spec: # nodeName: node01 //这个是指定到某个node节点上，填写node的ip地址 nodeSelector: env_role: dev //通过标签来进行指定匹配 containers: - name: nginx image: nginx //为node节点设置标签： kubectl label nodes 172.16.163.130 env_role=dev

Pod的重启策略

三种重启策略： Always：当容器停止，总是重建容器，默认策略。 OnFailure：当容器异常退出（退出状态码非0）时，才重启容器。 Never：当容器终止退出，从不重启容器。

例如：

apiVersion: v1 kind: Pod metadata: name: nginx-pod labels: app: nginx spec: # nodeName: node01 nodeSelector: env_role: dev //指定调度到某个节点上 containers: - name: nginx image: nginx restartPolicy: OnFailure //只有当容器异常退出时才重启

Pod的健康检查

提供Probe机制，有以下两种类型：

livenessProbe: 探测应用是否处于健康状态，如果不健康则删除重建该容器

readinessProbe：探测应用是否启动完成并且处于正常服务状态，如果不正常则更新容器的状态

Probe支持以下三种检查方法：

httpGet：发送HTTP请求，返回200-400范围状态码为成功。

exec ：执行Shell命令返回状态码是0为成功。

tcpSocket ：发起TCP Socket建立成功。

例如：

apiVersion: v1 kind: Pod metadata: name: nginx-pod labels: app: nginx spec: containers: - name: nginx image: nginx ports: - containerPort: 80 livenessProbe: httpGet: path: /index.html port: 80

Pod问题定位

kubectl describe TYPE NAME_PREFIX kubectl logs nginx-xxx kubectl exec –it nginx-xxx bash

转载于:https://www.cnblogs.com/jasonboren/p/11493268.html