使用ConfigMap在k8s部署中填充mountPath。yml

时间:2019-01-25 01:15:19

标签: docker configuration kubernetes environment-variables

我有一个docker容器,可映射用户的本地目录,使其成为持久卷。目录路径可通过环境变量“ MYSQL_DATA_FOLDER”进行自定义。

这在本地运行docker容器时很好用,但是,通过minikube / kubernetes启动容器时,这种方法不再起作用

仅使用docker启动此容器时,我将使用以下命令:

docker-compose run --service-ports --volume=$MYSQL_DATA_FOLDER:/var/lib/mysql --name db --rm database

这是docker-compose.yml文件

version: '3.5'
services:
  database:
    image: mysql:5.7
    ports:
      - "3306:3306"
    environment:
      MYSQL_ROOT_PASSWORD: ""
      MYSQL_ALLOW_EMPTY_PASSWORD: "yes"
    volumes:
      - mydatavolume:${MYSQL_DATA_FOLDER}
    build:
      context: .
      dockerfile: Dockerfile

volumes:
  mydatavolume:

networks:
  default:
    name: dev_network
    driver: bridge

这是环境变量文件(env-variables.env):

MYSQL_ALLOW_EMPTY_PASSWORD=yes
MYSQL_ROOT_PASSWORD=
MYSQL_DATA_FOLDER=/Users/foo/mysql/data

我使用以下命令使用kubernetes创建了一个ConfigMap:

kubectl create configmap db-env --from-env-file=env-variables.env 

这是deployment.yml文件:

apiVersion: v1
kind: Service
metadata:
  name: db-mysql
  labels:
    app: db
spec:
  ports:
    - port: 3306
  selector:
    app: db
    tier: mysql
  clusterIP: None
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: mysql-pv-claim
  labels:
    app: db
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 20Gi
---
apiVersion: apps/v1 
kind: Deployment
metadata:
  name: db-mysql
  labels:
    app: db
spec:
  selector:
    matchLabels:
      app: db
      tier: mysql
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: db
        tier: mysql
    spec:
      containers:
      - image: mysql
        name: mysql
        envFrom:
          - configMapRef:
              name: db-env
        livenessProbe:
          tcpSocket:
            port: 3306
        ports:
        - containerPort: 3306
          name: mysql
        volumeMounts:
        - name: mysql-persistent-storage
          mountPath: ${MYSQL_DATA_FOLDER}
      volumes:
      - name: mysql-persistent-storage
        persistentVolumeClaim:
          claimName: mysql-pv-claim

我想做的是使用环境变量MYSQL_DATA_FOLDER填充mountPath值,以便用户可以对其进行配置。

我希望能够“ git pull”并且无需对文件进行任何后期处理/预处理。

感谢任何线索

1 个答案:

答案 0 :(得分:1)

您可以按照以下方式进行操作:

source env.file && cat deployment.yml  | sed "s/{{MYSQL_DATA_FOLDER}}/$MYSQL_DATA_FOLDER/g" | kubectl apply -f -

以及您的yaml文件变量,例如:

...
        volumeMounts:
        - name: mysql-persistent-storage
          mountPath: {{MYSQL_DATA_FOLDER}}
...