部署扩缩容kubectl get deployC:\Users\zhangkubectl get deploy NAME READY UP-TO-DATE AVAILABLE AGE hello-k8s-deployment 3/3 3 3 5h56m通过上面的命令我们先找到一个deploy用来进行测试。现在看他是3个副本现在我们把他先缩到1个。kubectl scale deploy hello-k8s-deployment --replicas1C:\Users\zhangkubectl scale deploy hello-k8s-deployment --replicas1 deployment.apps/hello-k8s-deployment scaled C:\Users\zhangkubectl get deploy NAME READY UP-TO-DATE AVAILABLE AGE hello-k8s-deployment 1/1 1 1 5h58m然后再加到5个。kubectl scale deploy hello-k8s-deployment --replicas5C:\Users\zhangkubectl scale deploy hello-k8s-deployment --replicas5 deployment.apps/hello-k8s-deployment scaled C:\Users\zhangkubectl get deploy NAME READY UP-TO-DATE AVAILABLE AGE hello-k8s-deployment 1/5 5 1 6h17m C:\Users\zhangkubectl get deploy NAME READY UP-TO-DATE AVAILABLE AGE hello-k8s-deployment 5/5 5 5 6h18m通过命令可以看出来它不是马上就建好5个的而是有一定的时间逐渐建立起来的。滚动更新建一个新版本docker build -t hello-k8s:1.0 .D:\LEO\project\test3\k8s-testdocker build -t hello-k8s:1.0 . [] Building 0.3s (10/10) FINISHED docker:desktop-linux [internal] load build definition from Dockerfile 0.0s transferring dockerfile: 204B 0.0s [internal] load metadata for docker.io/library/python:3.10-slim 0.1s [internal] load .dockerignore 0.0s transferring context: 2B 0.0s [1/5] FROM docker.io/library/python:3.10-slimsha256:70f65c721aaddfb22b20ed6ec12606c59d9592493c5fcb6639f3d0e8 0.0s resolve docker.io/library/python:3.10-slimsha256:70f65c721aaddfb22b20ed6ec12606c59d9592493c5fcb6639f3d0e8 0.0s [internal] load build context 0.0s transferring context: 63B 0.0s CACHED [2/5] WORKDIR /app 0.0s CACHED [3/5] COPY requirements.txt . 0.0s CACHED [4/5] RUN pip install --no-cache-dir -r requirements.txt 0.0s CACHED [5/5] COPY app.py . 0.0s exporting to image 0.1s exporting layers 0.0s exporting manifest sha256:14484ee5ad887573cfd12ac62cbf7eb5547ff03226021a1c4234d5e12b02f89b 0.0s exporting config sha256:d69d28bf3d152a2e5b862be56583bac59c13ab81873688aa94be4c2403458c43 0.0s exporting attestation manifest sha256:693e5b58682b01e416285b2a47593679eee55578474b79d3e8a6866ea7158774 0.0s exporting manifest list sha256:f989154c957c2aaba2e37f7abf7ca172b0a54e53f6532dd7ed10ea4d5ac9d43d 0.0s naming to docker.io/library/hello-k8s:1.0 0.0s unpacking to docker.io/library/hello-k8s:1.0 0.0s更换版本D:\LEO\project\test3\k8s-testkubectl set image deploy hello-k8s-deployment hello-k8shello-k8s:1.0deployment.apps/hello-k8s-deployment image updatedD:\LEO\project\test3\k8s-testkubectl rollout status deploy hello-k8s-deploymentdeployment hello-k8s-deployment successfully rolled out查看更换版本的情况可以用下面的方式来确认D:\LEO\project\test3\k8s-testkubectl rollout history deploy hello-k8s-deployment deployment.apps/hello-k8s-deployment REVISION CHANGE-CAUSE 1 none 2 none D:\LEO\project\test3\k8s-testkubectl rollout history deploy hello-k8s-deployment --revision2 deployment.apps/hello-k8s-deployment with revision #2 Pod Template: Labels: apphello-k8s pod-template-hash5dbcc46558 Containers: hello-k8s: Image: hello-k8s:1.0 Port: 5000/TCP Host Port: 0/TCP Liveness: http-get http://:5000/health delay5s timeout1s period10s #success1 #failure3 Readiness: http-get http://:5000/health delay5s timeout1s period5s #success1 #failure3 Environment: none Mounts: none Volumes: none Node-Selectors: none Tolerations: none D:\LEO\project\test3\k8s-testkubectl rollout history deploy hello-k8s-deployment --revision1 deployment.apps/hello-k8s-deployment with revision #1 Pod Template: Labels: apphello-k8s pod-template-hash54d8cb895d Containers: hello-k8s: Image: hello-k8s:latest Port: 5000/TCP Host Port: 0/TCP Liveness: http-get http://:5000/health delay5s timeout1s period10s #success1 #failure3 Readiness: http-get http://:5000/health delay5s timeout1s period5s #success1 #failure3 Environment: none Mounts: none Volumes: none Node-Selectors: none Tolerations: none最后一步咱们再试一下回退。kubectl rollout undo deploy hello-k8s-deploymentD:\LEO\project\test3\k8s-testkubectl rollout history deploy hello-k8s-deployment deployment.apps/hello-k8s-deployment REVISION CHANGE-CAUSE 1 none 2 none D:\LEO\project\test3\k8s-testkubectl rollout undo deploy hello-k8s-deployment deployment.apps/hello-k8s-deployment rolled back D:\LEO\project\test3\k8s-testkubectl rollout history deploy hello-k8s-deployment deployment.apps/hello-k8s-deployment REVISION CHANGE-CAUSE 2 none 3 none验证成果还可以通过查看当前的配置文件来完成这个更好一点。kubectl get deploy hello-k8s-deployment -o yaml可以通过输出看到 image: hello-k8s:latest这就很明显了。说明已经回退到了之前的版本。完成。下次再研究一下分环境的功能。