GDG Cloud KH Meetup #4 - 給 RD 的 Kubernetes 初體驗
===

###### tags: `GDG-Cloud-KH` `K8S`

:::info

- **Event:**
- https://www.meetup.com/GCPUG-Kaohsiung/events/262412299/

- **Slide:**
- https://www.slideshare.net/williamyeh/rd-kubernetes-gdg-cloud-kh-201908-version

- **Sample project:**
- https://github.com/William-Yeh/workshop-k8s201908

- **WiFi**:
- AP: `GCPUG-KH`
- password: `gcpug-kh-2019`

:::

* 今日的優惠碼，是給已沒有免費額度的人使用，若是新申請的使用者，會有 GCP 新用戶的免費額度可用。

* Google Cloud 中文開發社群的 Telegram 群組 - https://t.me/googlecloudzhug

* 請大家一張桌子至少坐 2 個人，這樣過程中有問題時，還有隔壁的伙伴可以討論。

前言
---

### Agenda

1. Containers
2. Kubernetes
3. Cloud (Use the Kubernetes in Cloud)

### Goals

1. Kubernetes promising trends (賣點在哪？)
1. Adopt gradually
1. Prepare mindset

### GKE Setup

1. Redeem Google Cloud coupon
1. Create project in GCP
1.

## Redeem Google Cloud coupon

Please reference the workflow on paper.

> cloud.google.com/redeem

---

## Create K8s-enabled Project

1. Go to the "Kubernetes Engine".

> https://console.cloud.google.com/projectselector2/kubernetes


1. 建立一個新專案 (或選取之前建立好的專案)。


1. 確定專案名稱是否是剛剛選取的名稱。


##

1. 啟動 Cloud Shell (1/2)。


1. 啟動 Cloud Shell (2/2)。


1. Get the **project ID**.

> my-gke-lab1


### Key in some commands

1. gcloud config set project <PROJECT_ID>

    chusiang_lai@cloudshell:~ (my-gke-lab1)$ gcloud config set project my-gke-lab1
    Updated property [core/project].

1. gcloud config set compute/zone us-west1-a

    chusiang_lai@cloudshell:~ (my-gke-lab1)$ gcloud config set compute/zone us-west1-a
    Updated property [compute/zone].

1. gcloud container clusters create k8s201908 --num-nodes 3

    chusiang_lai@cloudshell:~ (my-gke-lab1)$ gcloud container clusters create k8s201908 --num-nodes 3
    WARNING: In June 2019, node auto-upgrade will be enabled by default for newly created clusters and node pools. To disable it, use the `--no-enable-autoupgrade` 
    flag.
    WARNING: Starting in 1.12, new clusters will have basic authentication disabled by default. Basic authentication can be enabled (or disabled) manually using the
     `--[no-]enable-basic-auth` flag.
    WARNING: Starting in 1.12, new clusters will not have a client certificate issued. You can manually enable (or disable) the issuance of the client certificate u
    sing the `--[no-]issue-client-certificate` flag.
    WARNING: Currently VPC-native is not the default mode during cluster creation. In the future, this will become the default mode and can be disabled using `--no-
    enable-ip-alias` flag. Use `--[no-]enable-ip-alias` flag to suppress this warning.
    WARNING: Starting in 1.12, default node pools in new clusters will have their legacy Compute Engine instance metadata endpoints disabled by default. To create a
     cluster with legacy instance metadata endpoints disabled in the default node pool, run `clusters create` with the flag `--metadata disable-legacy-endpoints=tru
    e`.
    WARNING: Your Pod address range (`--cluster-ipv4-cidr`) can accommodate at most 1008 node(s).
    This will enable the autorepair feature for nodes. Please see https://cloud.google.com/kubernetes-engine/docs/node-auto-repair for more information on node auto
    repairs.
    Creating cluster k8s201908 in us-west1-a... Cluster is being deployed...⠏ 

(Back to slides ...)

## Get example code

1. Go to the https://github.com/William-Yeh/workshop-k8s201908 .

1. Clone example project.

    $ git clone https://github.com/William-Yeh/workshop-k8s201908.git

## Lab # 1.0

1. C#
1. MVC

## Lab # 2.0

1. Add a Dockerfile.

## Lab # 3.0

1. 前後端分離。
1. 前端 30000 port、後端 30080 port。
1. Checkout to 3.0 tag.

    [ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 2.0)) - 14:48
    (cmd)$ git checkout 3.0
    Previous HEAD position was 89f2e7f 2.0: Dockerize the app with simple Dockerfile and docker-compose.yml.
    HEAD is now at f7dc3e4 3.0: Separate frontend and backend into 2 distinct containers.

1. Review files.

    [ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 3.0)) - 14:48
    (ins)$ tree .
    .
    ├── LICENSE
    ├── README.md
    ├── TodoApi
    │   ├── Controllers
    │   │   └── TodoController.cs
    │   ├── Dockerfile
    │   ├── LICENSE
    │   ├── Models
    │   │   ├── TodoContext.cs
    │   │   └── TodoItem.cs
    │   ├── Program.cs
    │   ├── Startup.cs
    │   ├── TodoApi.csproj
    │   ├── appsettings.Development.json
    │   └── appsettings.json
    ├── TodoApi-original.zip
    ├── TodoFrontend
    │   ├── Dockerfile
    │   ├── index.html
    │   ├── jquery-3.3.1.min.js
    │   └── site.js
    └── docker-compose.yml

    4 directories, 18 files

1. Run containers.

    [ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 3.0)) - 14:48
    (ins)$ docker-compose up -d
    Creating network "workshop-k8s201908_default" with the default driver
    Building todo-api
    Step 1/13 : FROM mcr.microsoft.com/dotnet/core/sdk:2.2 AS build
     ---> 3af77ac73731
    Step 2/13 : WORKDIR /app
     ---> Running in f430e0b20b52
    Removing intermediate container f430e0b20b52
     ---> 8b7149f6bdcd
    Step 3/13 : COPY *.csproj .
     ---> a349dbb180b8
    Step 4/13 : RUN  dotnet restore
     ---> Running in ada285379fba
      Restore completed in 3.65 sec for /app/TodoApi.csproj.
    Removing intermediate container ada285379fba
     ---> e638dde0c78d
    Step 5/13 : COPY . .
     ---> 832aa52eb047
    Step 6/13 : RUN  dotnet publish -o out
     ---> Running in 0541629e4e1d
    Microsoft (R) Build Engine version 16.2.32702+c4012a063 for .NET Core
    Copyright (C) Microsoft Corporation. All rights reserved.

      Restore completed in 61.12 ms for /app/TodoApi.csproj.
      TodoApi -> /app/bin/Debug/netcoreapp2.2/TodoApi.dll
      TodoApi -> /app/out/
    Removing intermediate container 0541629e4e1d
     ---> ea17fcdd991a
    Step 7/13 : FROM mcr.microsoft.com/dotnet/core/aspnet:2.2 AS runtime
     ---> 3ee0429b27ad
    Step 8/13 : LABEL maintainer="[e-mail]"
     ---> Running in 4eaf3256b79f
    Removing intermediate container 4eaf3256b79f
     ---> b4a4070d93e4
    Step 9/13 : ENV ASPNETCORE_URLS http://+:80
     ---> Running in 19a4868bcb30
    Removing intermediate container 19a4868bcb30
     ---> 9a64e28f467f
    Step 10/13 : EXPOSE 80
     ---> Running in 5c3038f9097c
    Removing intermediate container 5c3038f9097c
     ---> 38331774d119
    Step 11/13 : WORKDIR /app
     ---> Running in 9e33aaeb1e01
    Removing intermediate container 9e33aaeb1e01
     ---> f0bb3fb67cc4
    Step 12/13 : COPY --from=build /app/out ./
     ---> 69a3362e64c2
    Step 13/13 : ENTRYPOINT ["dotnet", "TodoApi.dll"]
     ---> Running in 4fd7f7a5be59
    Removing intermediate container 4fd7f7a5be59
     ---> 6e5ddb8f2e3f
    Successfully built 6e5ddb8f2e3f
    Successfully tagged todoapi:3.0
    WARNING: Image for service todo-api was built because it did not already exist. To rebuild this image you must use `docker-compose build` or `docker-compose up --build`.
    Building todo
    Step 1/5 : FROM busybox:1.30
    1.30: Pulling from library/busybox
    53071b97a884: Pull complete
    Digest: sha256:4b6ad3a68d34da29bf7c8ccb5d355ba8b4babcad1f99798204e7abb43e54ee3d
    Status: Downloaded newer image for busybox:1.30
     ---> 64f5d945efcc
    Step 2/5 : WORKDIR /app
     ---> Running in 0ae754b31362
    Removing intermediate container 0ae754b31362
     ---> 169cf1e37654
    Step 3/5 : COPY . .
     ---> b3accd7b6ee3
    Step 4/5 : EXPOSE 80
     ---> Running in b67f2f80d0f3
    Removing intermediate container b67f2f80d0f3
     ---> fdb878c03886
    Step 5/5 : CMD ["busybox", "httpd", "-f", "-p", "80"]
     ---> Running in e901359151a3
    Removing intermediate container e901359151a3
     ---> 524f3da6f6df
    Successfully built 524f3da6f6df
    Successfully tagged todofrontend:3.0
    WARNING: Image for service todo was built because it did not already exist. To rebuild this image you must use `docker-compose build` or `docker-compose up --build`.
    Creating workshop-k8s201908_todo-api_1 ... done
    Creating workshop-k8s201908_todo_1     ... done
    [ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 3.0)) - 14:49
    (ins)$

1. Remove current containers.

    [ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 3.0)) - 14:54
    (ins)$ docker-compose stop
    Stopping workshop-k8s201908_todo_1     ... done
    Stopping workshop-k8s201908_todo-api_1 ... done

    [ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 3.0)) - 14:54
    (ins)$ docker-compose rm -f
    Going to remove workshop-k8s201908_todo_1, workshop-k8s201908_todo-api_1
    Removing workshop-k8s201908_todo_1     ... done
    Removing workshop-k8s201908_todo-api_1 ... done

### Lab # 3.0 Review

1. Architecture
1. Main tasks
1. Diff
1. Tricks
1. Quexxxxx

## Lab # 4.0 Local Kubernetes

1. git checkout 4.0

    [ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 3.0)) - 15:11
    (ins)$ git checkout 4.0
    Previous HEAD position was f7dc3e4 3.0: Separate frontend and backend into 2 distinct containers.
    HEAD is now at 3a3502b 4.0: Support Kubernetes (locally).
    [ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 4.0)) - 15:11
    (ins)$

1. git log

    commit 3a3502b1ab772c9d5618f7142266371887cae124 (HEAD, tag: 4.0)
    Author: William Yeh <[e-mail]>
    Date:   Wed Jul 10 11:15:57 2019 +0800

        4.0: Support Kubernetes (locally).

    commit f7dc3e4f11af64d9ec5c7a3ad248b18ff9853cad (tag: 3.0)
    Author: William Yeh <[e-mail]>
    Date:   Wed Jul 10 11:14:48 2019 +0800

        3.0: Separate frontend and backend into 2 distinct containers.

    commit 89f2e7f76760257854aab0b1a0248e9fedee5f39 (tag: 2.0)
    Author: William Yeh <[e-mail]>
    Date:   Wed Jul 10 11:13:54 2019 +0800

        2.0: Dockerize the app with simple Dockerfile and docker-compose.yml.

    commit 64b77d3322668f21c64a5d387d7dd2a4b68ebd0e (tag: 1.0)
    Author: William Yeh <[e-mail]>
    Date:   Wed Jul 10 11:12:29 2019 +0800

    :

1. git diff --stat HEAD~1 HEAD

    [ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 4.0)) - 15:13
    (ins)$ git diff --stat HEAD~1 HEAD
     README.md                     |  40 ++++++++++++++++---
     k8s-dashboard.md              |  38 ++++++++++++++++++
     k8s/kubernetes-dashboard.yaml | 162 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
     k8s/todoapi-service.yml       |  52 +++++++++++++++++++++++++
     k8s/todofrontend-service.yml  |  52 +++++++++++++++++++++++++
     5 files changed, 338 insertions(+), 6 deletions(-)
    [ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 4.0)) - 15:13
    (ins)$

1. Review todofrontend-service.yml

Container: 將許多服務包進同一個容器中

kubernetes 架構：

* Service
* Deployment
* Pod: 把多個 containers 綁在同個 IP、主機上。常見的例子有：
* Backend service + redis。
* Nginx + uWSGI + ...
* Container

> 奇數選舉策略：最少一定要有 3 個

---

# 對應的版號。
apiVersion: v1

# 對應 K8s 的 Service 或 Deployment。
kind: Service                               # => Service

# 描述。
metadata:
  name: todofrontend
  labels:
    app: todo
    tier: frontend

# 真正的核心。
spec:
  type: NodePort
  ports:
    - port: 80
      nodePort: 30000
  selector:
    app: todo
    tier: frontend

---
apiVersion: apps/v1
kind: Deployment                            # ==> Deployment
metadata:
  name: todofrontend
  labels:
    app: todo
    tier: frontend

spec:
  replicas: 3
  selector:
    matchLabels:
      app: todo
      tier: frontend
  strategy:
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 1
    type: RollingUpdate

  template:   # pod definition              # ===> pod
    metadata:
      labels:
        app: todo
        tier: frontend
    spec:
      containers:                           # ====> container
        - name: todofrontend
          image: todofrontend:3.0
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 80
      #dnsPolicy: ClusterFirst
      #restartPolicy: Always

### Deployment & Replica

> Replicas = 3

1. Deployment 包含 Pod 和 container。
1. Pod 包含 container。

### Make sure you're using local Kubernetes

> https://github.com/William-Yeh/workshop-k8s201908/tree/4.0

1. kubectl config view

### Lab start

Create todo.

[ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 4.0)) - 15:40
(ins)$ kubectl create ns todo
namespace/todo created

Get status.

[ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 4.0)) - 15:40
(cmd)$ kubectl get ns
NAME              STATUS   AGE
default           Active   19m
kube-node-lease   Active   20m
kube-public       Active   20m
kube-system       Active   20m
todo              Active   36s

#### Build

[ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 4.0)) - 15:41
(ins)$ docker-compose build
Building todo-api
Step 1/13 : FROM mcr.microsoft.com/dotnet/core/sdk:2.2 AS build
 ---> 3af77ac73731
Step 2/13 : WORKDIR /app
 ---> Running in 0dd4ba363418
Removing intermediate container 0dd4ba363418
 ---> a7e67b42ca56
Step 3/13 : COPY *.csproj .
 ---> 7dcba74980a0
Step 4/13 : RUN  dotnet restore
 ---> Running in fc08f13bae4c
  Restore completed in 996.91 ms for /app/TodoApi.csproj.
Removing intermediate container fc08f13bae4c
 ---> 121cf4a9687b
Step 5/13 : COPY . .
 ---> 78d96bf15d59
Step 6/13 : RUN  dotnet publish -o out
 ---> Running in 52a9ff3b903a
Microsoft (R) Build Engine version 16.2.32702+c4012a063 for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.

  Restore completed in 63.2 ms for /app/TodoApi.csproj.
  TodoApi -> /app/bin/Debug/netcoreapp2.2/TodoApi.dll
  TodoApi -> /app/out/
Removing intermediate container 52a9ff3b903a
 ---> 60b5a1d8b0e4
Step 7/13 : FROM mcr.microsoft.com/dotnet/core/aspnet:2.2 AS runtime
 ---> 3ee0429b27ad
Step 8/13 : LABEL maintainer="[e-mail]"
 ---> Running in 215d38d42979
Removing intermediate container 215d38d42979
 ---> 0881e064ebd7
Step 9/13 : ENV ASPNETCORE_URLS http://+:80
 ---> Running in 16c32079f774
Removing intermediate container 16c32079f774
 ---> 4a488a38ad7a
Step 10/13 : EXPOSE 80
 ---> Running in 872944d628dc
Removing intermediate container 872944d628dc
 ---> 7a4504f487e4
Step 11/13 : WORKDIR /app
 ---> Running in 7d312d731af2
Removing intermediate container 7d312d731af2
 ---> 2a1ce265ad47
Step 12/13 : COPY --from=build /app/out ./
 ---> 60241e9eb65a
Step 13/13 : ENTRYPOINT ["dotnet", "TodoApi.dll"]
 ---> Running in 804aa3123794
Removing intermediate container 804aa3123794
 ---> e62cc653f93a
Successfully built e62cc653f93a
Successfully tagged todoapi:3.0
Building todo
Step 1/5 : FROM busybox:1.30
1.30: Pulling from library/busybox
53071b97a884: Pull complete
Digest: sha256:4b6ad3a68d34da29bf7c8ccb5d355ba8b4babcad1f99798204e7abb43e54ee3d
Status: Downloaded newer image for busybox:1.30
 ---> 64f5d945efcc
Step 2/5 : WORKDIR /app
 ---> Running in c09d9fb7e8ea
Removing intermediate container c09d9fb7e8ea
 ---> 11e21cf61811
Step 3/5 : COPY . .
 ---> e74c99765c36
Step 4/5 : EXPOSE 80
 ---> Running in 30041ed33d2c
Removing intermediate container 30041ed33d2c
 ---> 1af64117bba0
Step 5/5 : CMD ["busybox", "httpd", "-f", "-p", "80"]
 ---> Running in 7cf678322ccd
Removing intermediate container 7cf678322ccd
 ---> 2ae4f98e0e80
Successfully built 2ae4f98e0e80
Successfully tagged todofrontend:3.0
[ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 4.0)) - 15:42

Before run, we can review pods status of default pool.

[ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 4.0)) - 15:43
(ins)$ kubectl get pods
No resources found.

Before run, we can review pods status of todo pool.

[ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 4.0)) - 15:43
(ins)$ kubectl get pods -n todo
No resources found.

Before run, we can review deployment status of todo pool.

[ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 4.0)) - 15:44
(cmd)$ kubectl get deploy -n todo
No resources found.

#### Run

apply todoapi-service to todo pool.

[ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 4.0)) - 15:42
(ins)$ kubectl apply -f k8s/todoapi-service.yml -n todo
service/todoapi created
deployment.apps/todoapi created

[ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 4.0)) - 15:45
(ins)$ kubectl get svc -n todo
NAME      TYPE       CLUSTER-IP    EXTERNAL-IP   PORT(S)        AGE
todoapi   NodePort   10.101.6.95   <none>        80:30080/TCP   3m50s

[ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 4.0)) - 15:49
(ins)$ kubectl get deploy -n todo
NAME      READY   UP-TO-DATE   AVAILABLE   AGE
todoapi   0/3     3            0           5m47s

[ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 4.0)) - 15:50
(ins)$ kubectl get pods -n todo
NAME                       READY   STATUS             RESTARTS   AGE
todoapi-7c5c486947-5tw6t   0/1     ImagePullBackOff   0          6m34s
todoapi-7c5c486947-rz7h2   0/1     ErrImagePull       0          6m34s
todoapi-7c5c486947-z5wgk   0/1     ImagePullBackOff   0          6m34s

Try to delete one pod.

[ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 4.0)) - 15:50
(ins)$ kubectl delete pods todoapi-7c5c486947-rz7h2 -n todo
pod "todoapi-7c5c486947-rz7h2" deleted
[ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 4.0)) - 15:51
(cmd)$ kubectl get pods -n todo
NAME                       READY   STATUS             RESTARTS   AGE
todoapi-7c5c486947-5tw6t   0/1     ImagePullBackOff   0          7m18s
todoapi-7c5c486947-wz2tj   0/1     ErrImagePull       0          7s
todoapi-7c5c486947-z5wgk   0/1     ImagePullBackOff   0          7m18s
[ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 4.0)) - 15:51
(ins)$

[ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 4.0)) - 15:51
(ins)$ kubectl apply -f k8s/todofrontend-service.yml -n todo
service/todofrontend created
deployment.apps/todofrontend created

[ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 4.0)) - 15:51
(cmd)$ kubectl get svc -n todo
NAME           TYPE       CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
todoapi        NodePort   10.101.6.95     <none>        80:30080/TCP   9m
todofrontend   NodePort   10.99.135.208   <none>        80:30000/TCP   54s

1. 如有安裝 minikube，記得切回 docker-desktop！


1. Get api status via curl.

    [ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 4.0)) - 16:10
    (cmd)$ curl http://localhost:30080/api/todo
    [{"id":1,"name":"Item1","isComplete":false}][ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 4.0)) - 16:10
    (cmd)$ curl http://localhost:30080/api/todo   [{"id":1,"name":"Item1","isComplete":false}][ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 4.0)) - 16:10
    (cmd)$ curl http://localhost:30080/api/todo
    [{"id":1,"name":"Item1","isComplete":false}][ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 4.0)) - 16:10
    (cmd)$ curl http://localhost:30080/api/todo
    [{"id":1,"name":"Item1","isComplete":false}][ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 4.0)) - 16:10
    (cmd)$ curl http://localhost:30080/api/todo
    [{"id":1,"name":"Item1","isComplete":false}][ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 4.0)) - 16:10
    (ins)$

## Lab # 5.0

> https://github.com/William-Yeh/workshop-k8s201908/tree/5.0

1. Checkout to 5.0 tag.

    [ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 4.0)) - 16:15
    (cmd)$ git checkout 5.0
    Previous HEAD position was 3a3502b 4.0: Support Kubernetes (locally).
    HEAD is now at 47f84f0 5.0: Support ConfigMap and naming convention.

1. Remove todo namespace of 4.0 Lab.

    [ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 5.0)) - 16:15
    (ins)$ kubectl delete ns todo
    namespace "todo" deleted

1. Review changes.

    [ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 5.0)) - 16:19
    (ins)$ git diff --stat HEAD~1 HEAD
     README.md                    | 41 +++++++++++++++++++++++++++++++----------
     TodoFrontend/Dockerfile      | 11 ++++++++++-
     TodoFrontend/run.sh          | 16 ++++++++++++++++
     TodoFrontend/site.js         |  2 +-
     docker-compose.yml           |  2 +-
     k8s/config.local.yml         |  9 +++++++++
     k8s/todofrontend-service.yml | 14 ++++++++++++--
     7 files changed, 80 insertions(+), 15 deletions(-)

> TodoFrontend 的部分將 Dockerfile 的 CMD 改為執行 `run.sh` 這個 [shell script](https://github.com/William-Yeh/workshop-k8s201908/blob/5.0/TodoFrontend/run.sh) ，主要的目的為取代程式碼中的環境變數

* Replace with `sed`: `{{xxx}}` -> $xxx

### Preparation

1. Create the **todo** namespace.

    [ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 5.0)) - 16:19
    (ins)$ kubectl create ns todo
    namespace/todo created

1. foo

    [ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 5.0)) - 16:25
    (ins)$ kubectl apply -f k8s/config.local.yml -n todo
    configmap/config.local created

1. foo

    [ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 5.0)) - 16:25
    (ins)$ kubectl get configmaps -n todo
    NAME           DATA   AGE
    config.local   3      37s

### Build

Build new 5.0 image.

[ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 5.0)) - 1
(ins)$ docker-compose build
Building todo-api
Step 1/13 : FROM mcr.microsoft.com/dotnet/core/sdk:2.2 AS build
 ---> 3af77ac73731
Step 2/13 : WORKDIR /app
 ---> Using cache
 ---> a7e67b42ca56
Step 3/13 : COPY *.csproj .
 ---> Using cache
 ---> 7dcba74980a0
Step 4/13 : RUN  dotnet restore
 ---> Using cache
 ---> 121cf4a9687b
Step 5/13 : COPY . .
 ---> Using cache
 ---> 78d96bf15d59
Step 6/13 : RUN  dotnet publish -o out
 ---> Using cache
 ---> 60b5a1d8b0e4
Step 7/13 : FROM mcr.microsoft.com/dotnet/core/aspnet:2.2 AS runtime
 ---> 3ee0429b27ad
Step 8/13 : LABEL maintainer="[e-mail]"
 ---> Using cache
 ---> 0881e064ebd7
Step 9/13 : ENV ASPNETCORE_URLS http://+:80
 ---> Using cache
 ---> 4a488a38ad7a
Step 10/13 : EXPOSE 80
 ---> Using cache
 ---> 7a4504f487e4
Step 11/13 : WORKDIR /app
 ---> Using cache
 ---> 2a1ce265ad47
Step 12/13 : COPY --from=build /app/out ./
 ---> Using cache
 ---> 60241e9eb65a
Step 13/13 : ENTRYPOINT ["dotnet", "TodoApi.dll"]
 ---> Using cache
 ---> e62cc653f93a
Successfully built e62cc653f93a
Successfully tagged todoapi:3.0
Building todo
Step 1/8 : FROM busybox:1.30
 ---> 64f5d945efcc
Step 2/8 : WORKDIR /app
 ---> Using cache
 ---> 11e21cf61811
Step 3/8 : COPY . .
 ---> 98be11d67ac1
Step 4/8 : RUN chmod +x run.sh
 ---> Running in 85c55155993a
Removing intermediate container 85c55155993a
 ---> 8e7c83565fbb
Step 5/8 : ENV TODOAPI_HOST localhost
 ---> Running in b36f5fe1f734
Removing intermediate container b36f5fe1f734
 ---> 01d29407f4c6
Step 6/8 : ENV TODOAPI_PORT 30080
 ---> Running in 2386c465df0b
Removing intermediate container 2386c465df0b
 ---> 33b0c0a091ee
Step 7/8 : EXPOSE 80
 ---> Running in 7918de7a342d
Removing intermediate container 7918de7a342d
 ---> ceb4d9576c47
Step 8/8 : CMD ["./run.sh"]
 ---> Running in 9c0db2048fed
Removing intermediate container 9c0db2048fed
 ---> 8a51613c8863
Successfully built 8a51613c8863
Successfully tagged todofrontend:5.0
[ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 5.0)) - 16:28
$

### Run

[ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 5.0)) - 1
(cmd)$ kubectl apply -f k8s/todoapi-service.yml -n todo
service/todoapi created
deployment.apps/todoapi created

[ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 5.0)) - 16:30
(ins)$ kubectl apply -f k8s/todofrontend-service.yml -n todo
service/todofrontend created
deployment.apps/todofrontend created

[ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 5.0)) - 16:30
(cmd)$ kubectl get svc -n todo
NAME           TYPE       CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
todoapi        NodePort   10.111.165.42   <none>        80:30080/TCP   21s
todofrontend   NodePort   10.111.152.45   <none>        80:30000/TCP   7s

### EnvFrom

目的在於可以將 configMap 注入 env 設定

* [configmap reference](https://kubernetes.io/docs/tasks/configure-pod-container/configure-pod-configmap/)

https://github.com/William-Yeh/workshop-k8s201908/blob/5.0/k8s/todofrontend-service.yml#L51

    spec:
      containers:
        - name: todofrontend
          image: todofrontend:5.0
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 80
          envFrom:
            - configMapRef:
                name: config.local

## LAB # 6.0

1. Checkout to 6.0 tag.

    [ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 5.0)) - 16:32
    (cmd)$ git checkout 6.0
    Previous HEAD position was 47f84f0 5.0: Support ConfigMap and naming convention.
    HEAD is now at 0e7fd39 6.0: Support Kubernetes on the cloud (GKE for example) and use Skaffold to simplify the process.

1. Diff.

    [ jonny@unicorn ~/vcs/7.workshop/workshop-k8s201908 ] ((HEAD detached at 6.0)) - 16:41
    (ins)$ git diff --stat HEAD~1 HEAD
     README.md                                | 110 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++------------
     docker-compose.yml                       |  23 -----------------
     gke-steps.md                             |  49 +++++++++++++++++++++++++++++++++++
     k8s/cloud/config.cloud.yml.tpl           |   9 +++++++
     k8s/cloud/fix-name.py                    |  93 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
     k8s/cloud/todoapi-service.yml.tpl        |  55 +++++++++++++++++++++++++++++++++++++++
     k8s/cloud/todofrontend-service.yml.tpl   |  65 ++++++++++++++++++++++++++++++++++++++++++++++
     k8s/{ => local}/config.local.yml         |   0
     k8s/{ => local}/todoapi-service.yml      |   5 ++--
     k8s/{ => local}/todofrontend-service.yml |   5 ++--
     skaffold.yaml                            |  35 +++++++++++++++++++++++++
     11 files changed, 405 insertions(+), 44 deletions(-)

* 本次 LAB 是 手動選號 vs 自動選號 都會實作到。

### Usage: the cloud case

> https://github.com/William-Yeh/workshop-k8s201908/tree/6.0#usage-the-cloud-case

1. 建成功的，就會看到 RUNNING 的狀態。


1. 回頭記得砍掉已建好的環境，多練習個幾次！


#### Preparation

1. Run the Workshop on GKE (Google Kubernetes Engine)

> https://github.com/William-Yeh/workshop-k8s201908/blob/6.0/gke-steps.md


1. Allocate a static external IP address for TODOAPI_HOST:

    # reserve a new static external IP address for backend todoapi
    % gcloud compute addresses create todoapi --region=us-west1 --network-tier=PREMIUM

    # make sure the static external IP address has been allocated
    % gcloud compute addresses list


* todoapi ip address: 35.247.16.87

1. We will replace the ip address at https://github.com/William-Yeh/workshop-k8s201908/blob/6.0/k8s/cloud/todoapi-service.yml.tpl#L11 .

    spec:
      type: LoadBalancer
      loadBalancerIP: TODOAPI_IP_ADDR  # external IP (ephemeral or static)
      ports:
        - name: http
          port: 80
          targetPort: 80
      selector:
        app: todo
        tier: backend

1. 回頭練習完，記得把會收錢的 VPC IP 給拔掉。


1. Fill in correct image names and static IP addresses by modifying the PROJECT_ID and TODOAPI_IP_ADDR symbols in manifest files, by either:

    k8s/cloud/fix-name.py  PROJECT_ID  TODOAPI_IP_ADDR


1. Create a todo namespace for this app:
Create a todo namespace for this app:
Load the ConfigMap content:


#### Build and Run

The Skaffold is like docker-compose for K8s.

> https://github.com/William-Yeh/workshop-k8s201908/blob/6.0/skaffold.yaml

1. Use Skaffold to streamline the build-and-run process continuously:

    # dev: LiveReload mode.
    $ skaffold dev -p cloud --default-repo gcr.io/PROJECT_ID  -n todo


> 若時間允許，可在 local 先體驗一下 Skaffold 的威力！再上 cloud 玩。


1. Review the ip address.

    $ kubectl get svc -n todo


### Q&A

1. K8s 在本機練習上，算穩定嗎？
1. minikube 會比較穩定，但相對吃資源。

### LAB # 6.0 Review

1. Architecture
1. Main tasks
1. ....

## LAB # 7.0 Canary release

1. 新的 K8s 會使用 Istio 來跑 Canary release，比傳統 K8s 方法來得簡單好用。

1. 09/11 K8s Summit 有人會分享這一塊。

## END

### Remove GKE cluster

1. Delete the `todo` namespace.


1. Release the static ip address. (1/3)


1. Release the static ip address. (2/3)


1. Release the static ip address. (3/3)


1. Delete the Kubernetes clusters.


1. DONE (1/2).


1. DONE (2/2).