Kubernetes in Docker for Mac Beta小記

Kubernetes in Docker for Mac Beta小記

OS: Mac EI Capitan 10.11.6

Docker: 17.12.0-cd-mac45

這一次的 Docker for Mac 被提示有加入 Kubernetes, 所以就順手升級他了

首先觀察 about docker 來看這次的版本

接下來點選 工具列上 docker 圖案 -- >  Preferences

點選 Kubernetes 圖案 -- > 勾選 Enable Kubernetes

接下來會提示要安裝 Kubernetes cluster -- > 點選 Install

系統會進行 Cluster 的安裝

安裝完成之後就會告知, 右下角也會看到 Kubernetes is running -- > 點選 Close

嘗試於終端機進行 kubectl 操作

$ kubectl  get  pods

Unable to connect to the server: dial tcp: lookup openshift-master.chicago.openshift3roadshow.com on 192.168.0.1:53: no such host

$ kubectl  get   cluster-info

Unable to connect to the server: dial tcp: lookup openshift-master.chicago.openshift3roadshow.com on 192.168.0.1:53: no such host

觀察了一下, 發現之前在芝加哥的時候有參加 openshit3 的 roadshow, 設定還在, 產生的錯誤

$ cat   ~/.kube/config

apiVersion: v1

clusters:

- cluster:

   insecure-skip-tls-verify: true

   server: https://localhost:6443

 name: docker-for-desktop-cluster

- cluster:

   insecure-skip-tls-verify: true

   server: https://openshift-master.chicago.openshift3roadshow.com:8443

 name: openshift-master-chicago-openshift3roadshow-com:8443

contexts:

- context:

   cluster: docker-for-desktop-cluster

   user: docker-for-desktop

 name: docker-for-desktop

把現在的設定檔案備份起來

$ mv  ~/.kube/config   ~/.kube/config.bak

觀察資訊

$ ls  ~/.kube/

config.bak

嘗試看看可不可以用 kubectl  操作

$ kubectl  get  pods

The connection to the server localhost:8080 was refused - did you specify the right host or port?

接下來嘗試個大絕招 ~ 把 docker 關掉重新再開 :)

重新啟動 docker 之後再次觀察  ~/.kube

$ ls   ~/.kube/

config     config.bak

觀察  ~/.kube/config

$ cat   ~/.kube/config

apiVersion: v1

clusters:

- cluster:

   insecure-skip-tls-verify: true

   server: https://localhost:6443

 name: docker-for-desktop-cluster

contexts:

- context:

   cluster: docker-for-desktop-cluster

   user: docker-for-desktop

 name: docker-for-desktop

current-context: docker-for-desktop

kind: Config

preferences: {}

users:

- name: docker-for-desktop

 user:

   client-certificate-data: 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

   client-key-data: 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

這邊有看到是在 port  6443 listen

在 Mac 上面觀察一下

$ netstat  -an  -p  tcp | grep LIST

tcp6       0      0  ::1.6443               *.*                    LISTEN     

tcp4       0      0  *.6443                 *.*                    LISTEN     

tcp4       0      0  127.0.0.1.17603        *.*                    LISTEN     

tcp4       0      0  127.0.0.1.17600        *.*                    LISTEN     

tcp4       0      0  *.17500                *.*                    LISTEN     

tcp6       0      0  *.17500                *.*                    LISTEN     

tcp4       0      0  127.0.0.1.44320        *.*                    LISTEN     

再次嘗試操作

$ kubectl   get   pods

No resources found.

$ kubectl  get  nodes

NAME                 STATUS    ROLES     AGE       VERSION

docker-for-desktop   Ready     master    40m       v1.8.2

$ kubectl   get  deployment

No resources found.

$ kubectl   get   svc

NAME         TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE

kubernetes   ClusterIP   10.96.0.1    <none>        443/TCP   42m

接下來觀察  docker 這邊

首先會看到因為裝了 kubernetes, 所以多了很多 docker images

$ docker   images

REPOSITORY                                               TAG                 IMAGE ID            CREATED             SIZE

docker/kube-compose-controller                           v0.1.2              6480f70f7ac6        2 months ago        37.9MB

opensuse                                                 latest              c98336369400        2 months ago        108MB

sakanaacr.azurecr.io/opensuse                            latest              c98336369400        2 months ago        108MB

gcr.io/google_containers/kube-apiserver-amd64            v1.8.2              6278a1092d08        2 months ago        194MB

gcr.io/google_containers/kube-controller-manager-amd64   v1.8.2              5eabb0eae58b        2 months ago        129MB

gcr.io/google_containers/kube-scheduler-amd64            v1.8.2              b48970f8473e        2 months ago        54.9MB

gcr.io/google_containers/kube-proxy-amd64                v1.8.2              88e2c85d3d02        2 months ago        93.1MB

gcr.io/google_containers/k8s-dns-sidecar-amd64           1.14.5              fed89e8b4248        3 months ago        41.8MB

gcr.io/google_containers/k8s-dns-kube-dns-amd64          1.14.5              512cd7425a73        3 months ago        49.4MB

gcr.io/google_containers/k8s-dns-dnsmasq-nanny-amd64     1.14.5              459944ce8cc4        3 months ago        41.4MB

gcr.io/google_containers/etcd-amd64                      3.0.17              243830dae7dd        11 months ago       169MB

gcr.io/google_containers/pause-amd64                     3.0                 99e59f495ffa        20 months ago       747kB

透過 docker  version 觀察目前的 Orchestrator 為 kubernetes

$ docker  version

Client:

Version: 17.12-kube_beta

API version: 1.35

Go version: go1.9.2

Git commit: ca0c9dbcb219048a1a61fbf82a2e69f1b9795023

Built: Fri Dec 15 10:20:47 2017

OS/Arch: darwin/amd64

Orchestrator: kubernetes

Server:

Engine:

 Version: 17.12.0-ce

 API version: 1.35 (minimum version 1.12)

 Go version: go1.9.2

 Git commit: c97c6d6

 Built: Wed Dec 27 20:12:29 2017

 OS/Arch: linux/amd64

 Experimental: true

參考 “3 Minutes to Single Node Kubernetes cluster on Docker for Mac Platform” [1]

建立一個 webdemo.yml

觀察一下他的內容

$ cat   webdome.yml

apiVersion: v1

kind: Pod

metadata:

 name: collabweb

spec:

 containers:

 - name: webnix

   image: ajeetraina/webdemo

   ports:

     - containerPort: 8080

先觀察資訊

$ kubectl  get  pods

No resources found.

利用 webdemo.yml 建立 pod

$ kubectl   create  -f  webdemo.yml

pod "collabweb" created

$ kubectl  get  pods

NAME        READY     STATUS              RESTARTS   AGE

collabweb   0/1       ContainerCreating   0          1m

需要一點時間下載, 再次觀察

$ kubectl   get   pods

NAME        READY     STATUS    RESTARTS   AGE

collabweb   1/1       Running   0          6m

觀察相關資訊

$ kubectl  describe  pod  collabweb

Name:         collabweb

Namespace:    default

Node:         docker-for-desktop/192.168.65.3

Start Time:   Sat, 20 Jan 2018 18:08:33 +0800

Labels:       <none>

Annotations:  <none>

Status:       Running

IP:           10.1.0.6

Containers:

 webnix:

   Container ID:   docker://f193117c966b2c89fcb12e6ca81f135f20cc3dfe5ccf53c1b9873301d9648101

   Image:          ajeetraina/webdemo

   Image ID:       docker-pullable://ajeetraina/webdemo@sha256:5fddb01a372b02ec2d49465a920eda0f864b9b71ac75032fcbeeba028764bcd8

   Port:           8080/TCP

   State:          Running

     Started:      Sat, 20 Jan 2018 18:13:09 +0800

   Ready:          True

   Restart Count:  0

   Environment:    <none>

   Mounts:

     /var/run/secrets/kubernetes.io/serviceaccount from default-token-dwzlr (ro)

Conditions:

 Type           Status

 Initialized    True

 Ready          True

 PodScheduled   True

Volumes:

 default-token-dwzlr:

   Type:        Secret (a volume populated by a Secret)

   SecretName:  default-token-dwzlr

   Optional:    false

QoS Class:       BestEffort

Node-Selectors:  <none>

Tolerations:     node.alpha.kubernetes.io/notReady:NoExecute for 300s

                node.alpha.kubernetes.io/unreachable:NoExecute for 300s

Events:

 Type    Reason                 Age   From                         Message

 ----    ------                 ----  ----                         -------

 Normal  Scheduled              7m    default-scheduler            Successfully assigned collabweb to docker-for-desktop

 Normal  SuccessfulMountVolume  7m    kubelet, docker-for-desktop  MountVolume.SetUp succeeded for volume "default-token-dwzlr"

 Normal  Pulling                7m    kubelet, docker-for-desktop  pulling image "ajeetraina/webdemo"

 Normal  Pulled                 3m    kubelet, docker-for-desktop  Successfully pulled image "ajeetraina/webdemo"

 Normal  Created                3m    kubelet, docker-for-desktop  Created container

 Normal  Started                3m    kubelet, docker-for-desktop  Started container

按照網頁上面的做法, 但是卻得不到 deployment, 已經留言還有 twitter 詢問了

$ kubectl  get  deployment  -o  wide

No resources found.

姑且使用 kubectl  run 來試試看

$ kubectl  run  webdemo  --image=ajeetraina/webdemo  --port=8080

deployment "webdemo" created

再次觀察

$ kubectl  get  deployment  -o  wide

NAME      DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE       CONTAINERS   IMAGES               SELECTOR

webdemo   1         1         1            1           1m        webdemo      ajeetraina/webdemo   run=webdemo

在 expose 之前先觀察 services

$ kubectl  get  services

NAME         TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE

kubernetes   ClusterIP   10.96.0.1    <none>        443/TCP   3h

進行 expose

$ kubectl  expose  deployment  webdemo  --port=8080  --type=NodePort

service "webdemo" exposed

再次觀察

$ kubectl  get  services

NAME         TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE

kubernetes   ClusterIP   10.96.0.1        <none>        443/TCP          3h

webdemo      NodePort    10.103.123.186   <none>        8080:30797/TCP   51s

進行相關測試

可以用 curl 或是開啟瀏覽器, 按照上面給的 port 來連線, 例如我這次是 :30797/TCP 就是 localhost:30797

最後來刪除 deployment

先觀察資訊

$ kubectl  get  deployment

NAME      DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE

webdemo   1         1         1            1           11m

使用 kubectl delete 刪除

$ kubectl   delete  deployment  webdemo

deployment "webdemo" deleted

$ kubectl  get  deployment

No resources found.

$ kubectl  delete  pod  collabweb

pod "collabweb" deleted

搞定 :)

接下來可以在 Mac 進行 kubectl 練習了

Reference

• http://collabnix.com/running-your-first-web-application-on-kubernetes-powered-docker-for-mac-platform/
• https://www.youtube.com/watch?v=h4J8xQWlsQw

~ enjoy it