Kubernetes(k8s)中文文件 名詞解釋:PodPreset_Kubernetes中文社群
阿新 • • 發佈:2018-12-27
PodPreset
PodPreset用來給指定標籤的Pod注入額外的資訊,如環境變數、儲存卷等。這樣,Pod模板就不需要為每個Pod都顯式設定重複的資訊。
開啟PodPreset
- 開啟API settings.k8s.io/v1alpha1/podpreset
- 開啟准入控制 PodPreset
示例
增加環境變數和儲存卷的PodPreset
kind: PodPreset apiVersion: settings.k8s.io/v1alpha1 metadata: name: allow-database namespace: myns spec: selector: matchLabels: role: frontend env: - name: DB_PORT value: "6379" volumeMounts: - mountPath: /cache name: cache-volume volumes: - name: cache-volume emptyDir: {}
使用者提交Pod
apiVersion: v1 kind: Pod metadata: name: website labels: app: website role: frontend spec: containers: - name: website image: ecorp/website ports: - containerPort: 80
經過准入控制PodPreset後,Pod會自動增加環境變數和儲存卷
apiVersion: v1 kind: Pod metadata: name: website labels: app: website role: frontend annotations: podpreset.admission.kubernetes.io/allow-database: "resource version" spec: containers: - name: website image: ecorp/website volumeMounts: - mountPath: /cache name: cache-volume ports: - containerPort: 80 env: - name: DB_PORT value: "6379" volumes: - name: cache-volume emptyDir: {}
ConfigMap示例
ConfigMap
apiVersion: v1 kind: ConfigMap metadata: name: etcd-env-config data: number_of_members: "1" initial_cluster_state: new initial_cluster_token: DUMMY_ETCD_INITIAL_CLUSTER_TOKEN discovery_token: DUMMY_ETCD_DISCOVERY_TOKEN discovery_url: http://etcd_discovery:2379 etcdctl_peers: http://etcd:2379 duplicate_key: FROM_CONFIG_MAP REPLACE_ME: "a value"
PodPreset
kind: PodPreset apiVersion: settings.k8s.io/v1alpha1 metadata: name: allow-database namespace: myns spec: selector: matchLabels: role: frontend env: - name: DB_PORT value: 6379 - name: duplicate_key value: FROM_ENV - name: expansion value: $(REPLACE_ME) envFrom: - configMapRef: name: etcd-env-config volumeMounts: - mountPath: /cache name: cache-volume - mountPath: /etc/app/config.json readOnly: true name: secret-volume volumes: - name: cache-volume emptyDir: {} - name: secret-volume secretName: config-details
使用者提交的Pod
apiVersion: v1 kind: Pod metadata: name: website labels: app: website role: frontend spec: containers: - name: website image: ecorp/website ports: - containerPort: 80
經過准入控制 PodPreset後,Pod會自動增加ConfigMap環境變數
apiVersion: v1 kind: Pod metadata: name: website labels: app: website role: frontend annotations: podpreset.admission.kubernetes.io/allow-database: "resource version" spec: containers: - name: website image: ecorp/website volumeMounts: - mountPath: /cache name: cache-volume - mountPath: /etc/app/config.json readOnly: true name: secret-volume ports: - containerPort: 80 env: - name: DB_PORT value: "6379" - name: duplicate_key value: FROM_ENV - name: expansion value: $(REPLACE_ME) envFrom: - configMapRef: name: etcd-env-config volumes: - name: cache-volume emptyDir: {} - name: secret-volume secretName: config-details
參考:https://feisky.gitbooks.io/kubernetes/concepts/podpreset.html