kubernetes -- helm charts 开发: 16、编写job

1 job基础
job负责仅执行一次的任务。

2 job样例
2.1 查看job
yaml文件:
{{- if .Values.manifests.job_db_init_mongodb }}
{{- $envAll := . }}
{{- $dependencies := .Values.dependencies.db_init_mongodb }}
---
apiVersion: batch/v1
kind: Job
metadata:
  name: ceilometer-db-init-mongodb
spec:
  template:
    spec:
      restartPolicy: OnFailure
      nodeSelector:
        {{ .Values.labels.job.node_selector_key }}: {{ .Values.labels.job.node_selector_value }}
      initContainers:
{{ tuple $envAll $dependencies "[]" | include "helm-toolkit.snippets.kubernetes_entrypoint_init_container" | indent 8 }}
      containers:
        - name: ceilometer-db-init-mongodb
          image: {{ tuple .Values.images.tags "db_init_mongodb" . | include "helm-toolkit.utils.update_image" }}
          imagePullPolicy: {{ .Values.images.job_pull_policy | quote }}
{{ tuple $envAll $envAll.Values.pod.resources.jobs.db_init_mongodb | include "helm-toolkit.snippets.kubernetes_resources" | indent 10 }}
          env:
            - name: ROOT_DB_CONNECTION
              valueFrom:
                secretKeyRef:
                  name: {{ .Values.secrets.mongodb.admin }}
                  key: DB_CONNECTION
            - name: USER_DB_CONNECTION
              valueFrom:
                secretKeyRef:
                  name: {{ .Values.secrets.mongodb.user }}
                  key: DB_CONNECTION
          command:
            - /tmp/db-init-mongodb.sh
          volumeMounts:
            - name: ceilometer-bin
              mountPath: /tmp/db-init-mongodb.sh
              subPath: db-init-mongodb.sh
              readOnly: true
      volumes:
        - name: ceilometer-bin
          configMap:
            name: ceilometer-bin
            defaultMode: 0555
{{- end }}

实际结果:
apiVersion: batch/v1
kind: Job
metadata:
  creationTimestamp: 2020-01-15T07:45:53Z
  labels:
    controller-uid: 0e81db7b-376b-11ea-8f18-b82a72d4e66a
    job-name: ceilometer-db-init-mongodb
  name: ceilometer-db-init-mongodb
  namespace: openstack
  resourceVersion: "47873"
  selfLink: /apis/batch/v1/namespaces/openstack/jobs/ceilometer-db-init-mongodb
  uid: 0e81db7b-376b-11ea-8f18-b82a72d4e66a
spec:
  backoffLimit: 6
  completions: 1
  parallelism: 1
  selector:
    matchLabels:
      controller-uid: 0e81db7b-376b-11ea-8f18-b82a72d4e66a
  template:
    metadata:
      creationTimestamp: null
      labels:
        controller-uid: 0e81db7b-376b-11ea-8f18-b82a72d4e66a
        job-name: ceilometer-db-init-mongodb
    spec:
      containers:
      - command:
        - /tmp/db-init-mongodb.sh
        env:
        - name: ROOT_DB_CONNECTION
          valueFrom:
            secretKeyRef:
              key: DB_CONNECTION
              name: ceilometer-mongodb-admin
        - name: USER_DB_CONNECTION
          valueFrom:
            secretKeyRef:
              key: DB_CONNECTION
              name: ceilometer-mongodb-user
        image: hub.easystack.io/production/mongodb:latest
        imagePullPolicy: Always
        name: ceilometer-db-init-mongodb
        resources:
          limits:
            cpu: "2"
            memory: 1Gi
          requests:
            cpu: 100m
            memory: 124Mi
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
        volumeMounts:
        - mountPath: /tmp/db-init-mongodb.sh
          name: ceilometer-bin
          readOnly: true
          subPath: db-init-mongodb.sh
      dnsPolicy: ClusterFirst
      initContainers:
      - command:
        - kubernetes-entrypoint
        env:
        - name: POD_NAME
          valueFrom:
            fieldRef:
              apiVersion: v1
              fieldPath: metadata.name
        - name: NAMESPACE
          valueFrom:
            fieldRef:
              apiVersion: v1
              fieldPath: metadata.namespace
        - name: INTERFACE_NAME
          value: eth0
        - name: DEPENDENCY_SERVICE
          value: openstack:mongodb
        - name: DEPENDENCY_JOBS
        - name: DEPENDENCY_DAEMONSET
        - name: DEPENDENCY_CONTAINER
        - name: COMMAND
          value: echo done
        image: hub.easystack.io/production/kubernetes-entrypoint:v0.2.1
        imagePullPolicy: IfNotPresent
        name: init
        resources: {}
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
      nodeSelector:
        openstack-control-plane: enabled
      restartPolicy: OnFailure
      schedulerName: default-scheduler
      securityContext: {}
      terminationGracePeriodSeconds: 30
      volumes:
      - configMap:
          defaultMode: 365
          name: ceilometer-bin
        name: ceilometer-bin
status:
  completionTime: 2020-01-15T09:34:32Z
  conditions:
  - lastProbeTime: 2020-01-15T09:34:32Z
    lastTransitionTime: 2020-01-15T09:34:32Z
    status: "True"
    type: Complete
  startTime: 2020-01-15T07:45:53Z
  succeeded: 1

参考:
kubernetes-handbook
openstack helm charts