openshift 容器雲從入門到崩潰之五《部署應用》

一、配置部署模板

配置好用戶權限以後就能夠部署應用了oc經常使用的兩種部署方式：

Deploy Image方式

優勢：這種方式是最簡單的部署方式，你只須要有一個容器鏡像就好了或者公開的docker hub 鏡像

缺點：可是這種方式的肯定是不能隨時變動，也不能提早定義其餘配置

比較適合部署那些不常常變動的第三方服務

catalog方式（template）

優勢：能夠基於模板提早定義各類配置包括build、service、deployments等

缺點：一個類型的應用須要獨立的模板

比較適合本身開發的應用使用，使用template能夠省去上線新應用的時間

oc的catalog裏面包括大量的模板經常使用的一些數據庫一些開發環境都有

 

下面主要說一下自定義個模板怎麼建立

 

# vim nginx-openresty.yaml

apiVersion: template.openshift.io/v1
kind: Template
metadata:
  annotations:
    description: OpenResty(又稱：ngx_openresty) 是一個基於 NGINX 的可伸縮的 Web 平臺，由中國人章亦春發起，提供了不少高質量的第三方模塊。
    tags: nodejs
  creationTimestamp: 2018-10-10T07:17:57Z
  name: nginx-openresty
  namespace: openshift
  resourceVersion: "71699318"
  selfLink: /apis/template.openshift.io/v1/namespaces/openshift/templates/nginx-openresty
  uid: 9d1b5626-cc5c-11e8-a187-00163e0e008f
objects:
- apiVersion: v1
  kind: Route
  metadata:
    name: ${APP_NAME}
  spec:
    host: ${DOMAIN_NAME}
    to:
      kind: Service
      name: ${APP_NAME}
- apiVersion: v1
  kind: Service
  metadata:
    name: ${APP_NAME}
  spec:
    ports:
    - name: ${APP_NAME}
      port: 8080
      targetPort: 8080
    selector:
      name: ${APP_NAME}
    type: ClusterIP
- apiVersion: v1
  kind: ImageStream
  metadata:
    name: ${APP_NAME}
- apiVersion: v1
  kind: BuildConfig
  metadata:
    labels:
      name: ${APP_NAME}
    name: ${APP_NAME}
  spec:
    output:
      to:
        kind: ImageStreamTag
        name: ${APP_NAME}:latest
    postCommit: {}
    resources: {}
    runPolicy: Serial
    source:
      contextDir: /
      git:
        ref: ${APP_SOURCE_REPOSITORY_REF}
        uri: ${APP_SOURCE_REPOSITORY_URL}
      sourceSecret:
        name: gitlab-user
      type: Git
    strategy:
      sourceStrategy:
        env:
        - name: env
          value: ${ENV}
        - name: Project_Name
          value: ${APP_NAME}
        from:
          kind: ImageStreamTag
          name: ${APP_BUILDER_IMAGE}
          namespace: openshift
      type: Source
    triggers:
    - imageChange: {}
    - type: ImageChang
- apiVersion: v1
  kind: DeploymentConfig
  metadata:
    labels:
      name: ${APP_NAME}
    name: ${APP_NAME}
  spec:
    replicas: 1
    selector:
      name: ${APP_NAME}
    strategy:
      customParams:
        command:
        - /bin/sh
        - -c
        - sleep 5; echo slept for 5; /usr/bin/openshift-deploy
      type: Rolling
    template:
      metadata:
        labels:
          name: ${APP_NAME}
      spec:
        containers:
        - env:
          - name: ETCD_URL
            value: ${ETCD_URL}
          - name: env
            value: ${ENV}
          - name: NODE_ENV
            value: container
          image: ${APP_NAME}:latest
          livenessProbe:
            failureThreshold: 3
            httpGet:
              path: /status
              port: 80
              scheme: HTTP
            initialDelaySeconds: 20
            periodSeconds: 10
            successThreshold: 1
            timeoutSeconds: 3
          name: ${APP_NAME}
          ports:
          - containerPort: 8080
            protocol: TCP
          readinessProbe:
            failureThreshold: 3
            httpGet:
              path: /status
              port: 80
              scheme: HTTP
            initialDelaySeconds: 10
            periodSeconds: 10
            successThreshold: 1
            timeoutSeconds: 3
          resources:
            limits:
              cpu: ${CPU_LIMIT}
              memory: ${MEMORY_LIMIT}
            requests:
              cpu: 50m
              memory: 64Mi
          volumeMounts:
          - mountPath: /opt/configration
            name: configration
          - mountPath: /etc/localtime
            name: localtime
          - mountPath: /etc/timezone
            name: timezone
        volumes:
        - configMap:
            defaultMode: 420
            name: configration
          name: configration
        - hostPath:
            path: /etc/localtime
          name: localtime
        - hostPath:
            path: /etc/timezone
          name: timezone
    test: false
    triggers:
    - imageChangeParams:
        automatic: true
        containerNames:
        - ${APP_NAME}
        from:
          kind: ImageStreamTag
          name: ${APP_NAME}:latest
      type: ImageChange
    - type: ConfigChange
parameters:
- description: 項目名
  displayName: Name
  name: APP_NAME
  required: true
- description: 對外暴露域名
  displayName: Project domain name
  name: DOMAIN_NAME
  required: true
- description: 請輸入Git地址.僅支持HTTP方式.
  displayName: Source Repository URL
  name: APP_SOURCE_REPOSITORY_URL
  required: true
  value: http://git.xxx.cn/ops/nginx-config.git
- description: git倉庫的默認分支或者版本號
  displayName: Git Reference
  name: APP_SOURCE_REPOSITORY_REF
  required: true
  value: config-a
- description: git倉庫的路徑
  displayName: Context Directory
  name: CONTEXT_DIR
  value: /
- description: 設定當前環境,好比test、bts
  displayName: ENV
  name: ENV
  required: true
- description: build 時使用的基礎鏡像
  displayName: Base builder image of your app
  name: APP_BUILDER_IMAGE
  required: true
  value: openresty:1.11.2.3
- description: 超過此請求額度會被強制重啓.單位Mi/Gi.
  displayName: Memory Limits
  name: MEMORY_LIMIT
  required: true
  value: 64Mi
- description: 超過此請求額度會被強制重啓.單位m/g.
  displayName: CPU Limits
  name: CPU_LIMIT
  required: true
  value: 50m

 

 下一步導入到oc catalog裏面

# oc project openshift
# oc oc create -f nginx-openresty.yaml

在登錄oc的web console 就可使用nginx-openresty模板部署應用了

 

 

二、deployment策略

deployment顧名思義是最終部署應用的重要環節，包括了變動策略、最終POD的運行配置等關鍵信息

Deployment Strategy：

這個是部署應用是的變動策略一共有三種策略

Rolling（滾動升級）

spec:
  strategy:
    rollingParams:
      intervalSeconds: 1
      maxSurge: 25%
      maxUnavailable: 25%
      timeoutSeconds: 600
      updatePeriodSeconds: 1
    type: Rolling

Recreate（從新建立）

spec:
  strategy:
    type: Recreate

 Custom（自定義）

 不經常使用

Deployment Triggers：

這個配置決定了什麼狀況下Deployment 纔會觸發

ImageChange 鏡像變動

ConfigChange Deployment 配置變動

spec:
   triggers:
    - imageChangeParams:
        automatic: true
        containerNames:
          - nginx-template
        from:
          kind: ImageStreamTag
          name: 'nginx-template:latest'
          namespace: test
      type: ImageChange
    - type: ConfigChange

 

  triggers:
    - imageChangeParams:
        automatic: true
        containerNames:
          - nginx-template
        from:
          kind: ImageStreamTag
          name: 'nginx-template:latest'
          namespace: test
      type: ImageChange   #鏡像更新
    - type: ConfigChange   #Deployment 配置更新