归纳于,参考了 一文,更多 Docker 或者 Kubernetes 相关资料参阅 。
下载最新的 Docker for Mac 或者 Edge 版本,即可以看到内置的 Kubernetes 集群,直接点击安装即可在本地搭建好单节点的 Kubernetes 环境:
安装完毕后,如果我们也勾选了 Show system containers 选项,那么使用如下的 Docker 命令,能看到自动安装的 Kubernetes 相关容器:
➜ ~ docker container ls --format "table{ {.Names}}\t{ {.Image }}\t{ {.Command}}"NAMES IMAGE COMMANDk8s_compose_compose-75f8bb4779-stxv9_docker_3c963862-f9f4-11e7-93cc-025000000001_0 docker/kube-compose-controller "/compose-controller…"k8s_POD_compose-75f8bb4779-stxv9_docker_3c963862-f9f4-11e7-93cc-025000000001_0 gcr.io/google_containers/pause-amd64:3.0 "/pause"k8s_sidecar_kube-dns-545bc4bfd4-799pr_kube-system_139bf000-f9f4-11e7-93cc-025000000001_0 gcr.io/google_containers/k8s-dns-sidecar-amd64 "/sidecar --v=2 --lo…"k8s_dnsmasq_kube-dns-545bc4bfd4-799pr_kube-system_139bf000-f9f4-11e7-93cc-025000000001_0 gcr.io/google_containers/k8s-dns-dnsmasq-nanny-amd64 "/dnsmasq-nanny -v=2…"k8s_kubedns_kube-dns-545bc4bfd4-799pr_kube-system_139bf000-f9f4-11e7-93cc-025000000001_0 gcr.io/google_containers/k8s-dns-kube-dns-amd64 "/kube-dns --domain=…"k8s_kube-proxy_kube-proxy-rrd8t_kube-system_139b00df-f9f4-11e7-93cc-025000000001_0 gcr.io/google_containers/kube-proxy-amd64 "/usr/local/bin/kube…"k8s_POD_kube-dns-545bc4bfd4-799pr_kube-system_139bf000-f9f4-11e7-93cc-025000000001_0 gcr.io/google_containers/pause-amd64:3.0 "/pause"k8s_POD_kube-proxy-rrd8t_kube-system_139b00df-f9f4-11e7-93cc-025000000001_0 gcr.io/google_containers/pause-amd64:3.0 "/pause"k8s_kube-scheduler_kube-scheduler-docker-for-desktop_kube-system_972d74c9fc2f4ebd8ab673058e386a65_0 gcr.io/google_containers/kube-scheduler-amd64 "kube-scheduler --ad…"k8s_kube-apiserver_kube-apiserver-docker-for-desktop_kube-system_f7a81e8fe624bd46059fc6084e86bb81_0 gcr.io/google_containers/kube-apiserver-amd64 "kube-apiserver --ad…"k8s_etcd_etcd-docker-for-desktop_kube-system_56a21c0a5f545c0cca5388c457bb1b3b_0 gcr.io/google_containers/etcd-amd64 "etcd --advertise-cl…"k8s_kube-controller-manager_kube-controller-manager-docker-for-desktop_kube-system_8d1848c1e562e35a225e402988eadcd1_0 gcr.io/google_containers/kube-controller-manager-amd64 "kube-controller-man…"k8s_POD_kube-apiserver-docker-for-desktop_kube-system_f7a81e8fe624bd46059fc6084e86bb81_0 gcr.io/google_containers/pause-amd64:3.0 "/pause"k8s_POD_kube-controller-manager-docker-for-desktop_kube-system_8d1848c1e562e35a225e402988eadcd1_0 gcr.io/google_containers/pause-amd64:3.0 "/pause"k8s_POD_kube-scheduler-docker-for-desktop_kube-system_972d74c9fc2f4ebd8ab673058e386a65_0 gcr.io/google_containers/pause-amd64:3.0 "/pause"k8s_POD_etcd-docker-for-desktop_kube-system_56a21c0a5f545c0cca5388c457bb1b3b_0 gcr.io/google_containers/pause-amd64:3.0 "/pause"复制代码
关于各个容器的作用,可以参阅 。在安装过程中,Docker 也为我们安装了 kubectl 控制命令:
$ kubectl get namespaces$ kubectl get posts --namespace kube-system复制代码
接下来我们可以使用 kubectl 命令来创建简单的 kubernetes-dashboard 服务:
➜ ~ kubectl create -f https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yamlsecret "kubernetes-dashboard-certs" createdserviceaccount "kubernetes-dashboard" createdrole "kubernetes-dashboard-minimal" createdrolebinding "kubernetes-dashboard-minimal" createddeployment "kubernetes-dashboard" createdservice "kubernetes-dashboard" created复制代码
服务安装完毕后可以查看部署的容器与服务:
➜ ~ kubectl get deployments --namespace kube-systemNAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGEkube-dns 1 1 1 1 22mkubernetes-dashboard 1 1 1 0 26s➜ ~ kubectl get services --namespace kube-systemNAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGEkube-dns ClusterIP 10.96.0.1053/UDP,53/TCP 22mkubernetes-dashboard ClusterIP 10.111.242.95 443/TCP 30s复制代码
在 Dashboard 启动完毕后,可以使用 kubectl 提供的 Proxy 服务来访问该面板:
$ kubectl proxy# 打开如下地址:# http://localhost:8001/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/复制代码
如果访问报错,可以尝试编辑 kubernetes-dashboard 服务,或者参阅:
$ kubectl -n kube-system edit service kubernetes-dashboard# Please edit the object below. Lines beginning with a '#' will be ignored,# and an empty file will abort the edit. If an error occurs while saving this file will be# reopened with the relevant failures.#apiVersion: v1... name: kubernetes-dashboard namespace: kube-system resourceVersion: "343478" selfLink: /api/v1/namespaces/kube-system/services/kubernetes-dashboard-head uid: 8e48f478-993d-11e7-87e0-901b0e532516spec: clusterIP: 10.100.124.90 externalTrafficPolicy: Cluster ports: - port: 443 protocol: TCP targetPort: 8443 selector: k8s-app: kubernetes-dashboard sessionAffinity: None type: ClusterIP ->> NodePortstatus: loadBalancer: {}复制代码
访问上述地址,我们可以看到登录界面:
此时可暂时直接跳过,进入到控制面板中:
Docker 同样为我们提供了简单的应用示范,可以直接使用如下的 Docker Compose 配置文件:
version: '3.3'services: web: build: web image: dockerdemos/lab-web volumes: - "./web/static:/static" ports: - "80:80" words: build: words image: dockerdemos/lab-words deploy: replicas: 5 endpoint_mode: dnsrr resources: limits: memory: 16M reservations: memory: 16M db: build: db image: dockerdemos/lab-db复制代码
然后使用 stack 命令创建应用栈:
$ docker stack deploy --compose-file stack.yml demoStack demo was createdWaiting for the stack to be stable and running... - Service web has one container running复制代码
应用栈创建完毕后,可以使用 kubectl 查看创建的 Pods:
$ kubectl get podsNAME READY STATUS RESTARTS AGEdb-7f99cc64b7-cbd9t 1/1 Running 0 2mweb-758c6998f8-tmxfm 1/1 Running 0 2mwords-54bf6c5d57-8bxc8 1/1 Running 0 2mwords-54bf6c5d57-dzxm8 1/1 Running 0 2mwords-54bf6c5d57-k2448 1/1 Running 0 2mwords-54bf6c5d57-mhh4p 1/1 Running 0 2mwords-54bf6c5d57-w2q82 1/1 Running 0 2m复制代码
也可以来查看部署的集群与服务:
$ kubectl get deploymentsNAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGEdb 1 1 1 1 3mweb 1 1 1 1 3mwords 5 5 5 5 3m$ kubectl get servicesNAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGEdb ClusterIP None55555/TCP 3mkubernetes ClusterIP 10.96.0.1 443/TCP 52mweb LoadBalancer 10.97.154.28 80:30577/TCP 3mwords ClusterIP None 55555/TCP 3m复制代码
可以看到这里的 web 有所谓的 LoadBalancer 类型,即可以对外提供服务。最后我们还可以用 stack 与 kubectl 命令来删除应用:
$ docker stack remove demo$ kubectl delete deployment kubernetes-dashboard --namespace kube-system复制代码