分享程序员开发的那些事...
更新时间：2021-09-10 18:37:32
笔记本/台式机电脑的性能足够强劲（内存不低于 8G），可以直接安装 docker-desktop，并启用其中内嵌的 Kubernetes 集群，用做学习、测试，也可以用作日常开发。
从 docker 下载 docker-desktop (opens new window)，并完成安装
MAC
启动 docker-desktop
打开 docker-desktop 的 preference 面板
切换到 Kubernetes 标签页
并勾选启动 Enable Kubernetes，点击 Apply
kubectl config viewkubectl config get-contextskubectl cluster-infokubectl get pods -o widedocker network inspect bridge[ { "Name": "bridge", "Id": "e6a5227c83898fa2904259426de838145d62539d01fb7f3fe241f65db38a3c3b", "Created": "2020-12-30T02:51:44.917984338Z", "Scope": "local", "Driver": "bridge", "EnableIPv6": false, "IPAM": { "Driver": "default", "Options": null, "Config": [ { "Subnet": "172.17.0.0/16", "Gateway": "172.17.0.1" } ] }, "Internal": false, "Attachable": false, "Ingress": false, "ConfigFrom": { "Network": "" }, "ConfigOnly": false, "Containers": {}, "Options": { "com.docker.network.bridge.default_bridge": "true", "com.docker.network.bridge.enable_icc": "true", "com.docker.network.bridge.enable_ip_masquerade": "true", "com.docker.network.bridge.host_binding_ipv4": "0.0.0.0", "com.docker.network.bridge.name": "docker0", "com.docker.network.driver.mtu": "1500" }, "Labels": {} } ]
另一种进入nginx容器的方法
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] – [COMMAND] instead.
因为刚才创建的 nginx pod 里只有一个容器，所以我们就进入了那个。可如果nginx pod 里有俩容器，默认只会进第一个，如何进第二个呢？
kubectl describe pods nginx➜ pod-basic kubectl describe pods nginx Name: nginx Namespace: default Priority: 0 Node: docker-desktop/192.168.65.3 Start Time: Wed, 30 Dec 2020 12:35:54 +0800 Labels: app=nginx Annotations: <none> Status: Running IP: 10.1.0.6 IPs: IP: Containers: nginx: Container ID: docker://f4e45055b4b33430ecd775494c6bd8a8fe0c351ab1333016fcdc588182f40e41 Image: nginx Image ID: docker-pullable://nginx@sha256:4cf620a5c81390ee209398ecc18e5fb9dd0f5155cd82adcbae532fec94006fb9 Port: 80/TCP Host Port: 0/TCP State: Running Started: Wed, 30 Dec 2020 12:40:42 +0800 Ready: True Restart Count: 0 Environment: <none> Mounts: /var/run/secrets/kubernetes.io/serviceaccount from default-token-tqpkf (ro) Conditions: Type Status Initialized True Ready True ContainersReady True PodScheduled True Volumes: default-token-tqpkf: Type: Secret (a volume populated by a Secret) SecretName: default-token-tqpkf Optional: false 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 Pulled 60m kubelet Successfully pulled image "nginx" in 35.578083503s Normal Created 60m kubelet Created container nginx Normal Started 60m kubelet Started container nginx
# 删除一个配置文件对应的资源对象 kubectl delete -f xxx.yaml # 删除名字为baz或foo的pod和service kubectl delete pod,service baz foo # -l 参数可以删除包含指定label的资源对象 kubectl delete pods,services -l name=myLabel # 强制删除一个pod，在各种原因pod一直terminate不掉的时候很有用 kubectl delete pod foo --grace-period=0 --force
kubectl delete pods imagename# 将foo.yaml中描述的对象扩展为3个 kubectl scale --replicas=3 -f foo.yaml # 增加description='my frontend'备注,已有保留不覆盖 kubectl annotate pods foo description='my frontend' # 增加status=unhealthy 标签，已有则覆盖 kubectl label --overwrite pods foo status=unhealthy
kubectl scale rs nginx --replicas=2 更新某 pod 内集群数
# 创建一个service，暴露 nginx 这个rc kubectl expose deployment nginx-deployment --type=NodePort
kubectl get svc
切换上下文
kubectl config use-context xxx 即可