『Docker/Kubernetes 実践コンテナ開発入門』輪読会 #5

https://yourmystar.connpass.com/event/120903/

Transcript

1. 『Docker/Kubernetes 実践コン
   テナ開発入門』輪読会 #5
   2019/02/25
   1
   @inase17000
   

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2. Kubernetes入門
   5.1 Kubernetesとは
   5.2 ローカル環境でKubernetesを実行する
   5.3 Kubernetesの概念
   5.4 KubernetesクラスタとNode
   5.5 Namespace
   5.6 Pod
   5.7 ReplicaSet
   5.8 Deployment
   5.9 Service
   5.10 Ingress
   2
   

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3. 5.1 Kubernetesとは
   3
   ホストOS
   Docker
   コンテナ1 コンテナ2 コンテナ3
   ホストOS
   Kubernetes
   Docker Kubernetes
   Master Node Node1
   コンテナ1
   コンテナ1
   コンテナ1
   コンテナ2
   Deployment / ReplicaSet
   Node2
   コンテナ1
   コンテナ1
   コンテナ1
   コンテナ2
   Deployment / ReplicaSet
   kube apiserver
   etcd
   kube scheduler
   kube controller
   manager
   Service
   Ingress
   

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4. 5.2 ローカル環境でKubernetesを実行する
   4
   

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5. 5.2 ローカル環境でKubernetesを実行する
   5
   # 5.2.1
   curl -LO https://storage.googleapis.com/kubernetes-release/release/v1.10.4/bin/darwin/amd64/kubectl \
   && chmod +x kubectl \
   && mv kubectl /usr/local/bin/
   kubectl apply -f
   https://raw.githubusercontent.com/kubernetes/dashboard/v1.8.3/src/deploy/recommended/kubernetes-dashbo
   ard.yaml
   kubectl get pod --namespace=kube-system -l k8s-app=kubernetes-dashboard
   kubectl proxy
   http://localhost:8001/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/
   

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6. 5.2 ローカル環境でKubernetesを実行する
   6
   http://localhost:8001/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/
   

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7. 5.4 KubernetesクラスタとNode
   7
   # 5.4
   kubectl get nodes
   

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8. 5.6 Pod
   YAMLについて補足
   8
   配列 ハッシュ
   - A
   - B
   -
   - C-1
   - C-2
   A: a
   B: b
   C:
   C-1: c1
   C-2: c2
   [“A”, “B”, [“C-1”, “C-2”]] {“A” => “a”, “B” => “b”, “C” => {“C-1” => “c1”, “C-2” => “c2”}}
   

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9. 5.6 Pod
   YAMLのサンプル
   9
   https://magazine.rubyist.net/articles/0009/0009-YAML.html
   

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10. 5.6 Pod
    10
    # 5.6.1
    # simple-pod.yml
    apiVersion: v1
    kind: Pod
    metadata:
    name: simple-echo
    spec:
    containers:
    - name: nginx
    image: gihyodocker/nginx-proxy:latest
    env:
    - name: BACKEND_HOST
    value: localhost:8000
    ports:
    - containerPort: 80
    - name: echo
    image: gihyodocker/echo:latest
    ports:
    - containerPort: 8080
    

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11. 5.6 Pod
    11
    # 5.6.1
    kubectl apply -f simple-pod.yml
    kubectl get pod
    kubectl exec -it simple-echo sh -c nginx
    kubectl logs -f simple-echo -c echo
    kubectl delete pod simple-echo
    kubectl delete -f simple-pod.yml
    

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12. 5.7 ReplicaSet
    12
    # 5.7
    # simple-replicaset.yml
    apiVersion: apps/v1
    kind: ReplicaSet
    metadata:
    name: echo
    labels:
    app: echo
    spec:
    replicas: 3
    selector:
    matchLabels:
    app: echo
    template:
    metadata:
    labels:
    app: echo
    spec:
    containers:
    - name: nginx
    image: gihyodocker/nginx-proxy:latest
    env:
    - name: BACKEND_HOST
    value: localhost:8080
    ports:
    - containerPort: 80
    - name: echo
    image: gihyodocker/echo:latest
    ports:
    - containerPort: 8080
    

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13. 5.7 ReplicaSet
    13
    # 5.6.1
    kubectl apply -f simple-replicaset.yml
    kubectl delete -f simple-replicaset.yml
    

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14. 5.8 Deployment
    14
    # 5.8
    # simple-deployment.yml
    apiVersion: apps/v1
    kind: Deployment
    metadata:
    name: echo
    labels:
    app: echo
    spec:
    replicas: 3
    selector:
    matchLabels:
    app: echo
    template:
    metadata:
    labels:
    app: echo
    spec:
    containers:
    - name: nginx
    image: gihyodocker/nginx-proxy:latest
    env:
    - name: BACKEND_HOST
    value: localhost:8000
    ports:
    - containerPort: 80
    - name: echo
    image: gihyodocker/echo:latest
    ports:
    - containerPort: 8080
    

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15. 5.8 Deployment
    15
    # 5.8.1
    kubectl apply -f simple-deployment.yml --record
    kubectl get pod,replicaset,deployment --selector app=echo
    kubectl rollout history deployment echo
    # 5.8.2
    kubectl rollout history deployment echo --revision=2
    kubectl rollout history deployment echo --revision=3
    kubectl rollout undo deployment echo
    kubectl delete -f simple-deployment.yml
    

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16. # 5.9
    # simple-replicaset-with-label.yml
    apiVersion: apps/v1
    kind: ReplicaSet
    metadata:
    name: echo-spring
    labels:
    app: echo
    release: spring
    spec:
    replicas: 3
    selector:
    matchLabels:
    app: echo
    release: spring
    template:
    metadata:
    labels:
    app: echo
    release: spring
    5.9 Services
    16
    spec:
    containers:
    - name: nginx
    image: gihyodocker/nginx-proxy:latest
    env:
    - name: BACKEND_HOST
    value: localhost:8000
    ports:
    - containerPort: 80
    - name: echo
    image: gihyodocker/echo:latest
    ports:
    - containerPort: 8080
    ---
    apiVersion: apps/v1
    kind: ReplicaSet
    metadata:
    name: echo-summer
    labels:
    app: echo
    release: summer
    ...つづく
    

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17. 5.9 Services
    17
    # 5.9
    kubectl apply -f simple-replicaset-with-label.yml
    kubectl get pod -l app=echo -l release=spring
    kubectl get pod -l app=echo -l release=summer
    kubectl apply -f simple-service.yml
    kubectl get svc echo
    kubectl run -i --rm --tty debug --image=gihyodocker/fundamental:0.1.0 --restart=Never -- bash -il
    kubectl logs -f echo-summer-8qxmg -c echo
    

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18. 5.10 Ingress
    ● L4バランサー
    ○ IPアドレスとポート番号による負
    荷分散
    ● L7バランサー
    ○ URLやHTTPヘッダーで負荷分
    散
    18
    https://academy.gmocloud.com/qa/20170810/4591
    

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19. 5.10 Ingress
    19
    # 5.10
    kubectl apply -f
    https://raw.githubusercontent.com/kubernetes/ingress-nginx/nginx-0.16.2/deploy/mandatory.yaml
    kubectl apply -f
    https://raw.githubusercontent.com/kubernetes/ingress-nginx/nginx-0.16.2/deploy/provider/cloud-generic.yaml
    kubectl -n ingress-nginx get service,pod
    # 5.10.2
    kubectl apply -f simple-service.yml
    kubectl get ingress
    curl http://localhost -H 'Host: ch05.gihyo.local'
    

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