Question

我正在开发一个多容器 Flask 应用程序，它涉及一个 Web 容器（Flask 应用程序）、Postgres 容器（用于数据库服务）和一个 Redis 容器（用于缓存服务）。

Web 应用程序具有 web_deployment.yaml 和 web_service.yaml 文件。 Postgres 应用程序具有 postgres_deployment.yaml 和 postgres_service.yaml 文件。 Redis 应用有 redis_deployment.yaml 和 redis_service.yaml 文件。

我的 web_deployment.yaml 文件如下所示：

apiVersion: apps/v1
kind: Deployment
metadata:
  name: web-deployment
spec:
  replicas: 3
  template:
    metadata:
      labels:
        component: my-web-app
    spec:
      containers:
      - name: my-web-app-container
        image: web_app_image:latest
        ports:
        - containerPort: 80
        env:
          - name: REDIS_HOST
            value: redis-service
          - name: REDIS_PORT
            value: '6379'
          - name: POSTGRES_USER
            value: username
          - name: POSTGRES_HOST
            value: postgres-service
          - name: POSTGRES_PORT
            value: '5432'
          - name: POSTGRES_DB
            value: postgres_db
          - name: PGPASSWORD
            valueFrom:
              secretKeyRef:
                name: pgpassword
                key: PGPASSWORD
  selector:
    matchLabels:
      component: my-web-app

postgres_deployment.yaml 文件如下所示：

apiVersion: apps/v1
kind: Deployment 
metadata:
  name: postgres-deployment 
spec: 
  replicas: 1 
  selector:
    matchLabels:
      component: postgres 
  template:
    metadata:
      labels:
        component: postgres
    spec: 
      volumes: 
        - name: postgres-storage
          persistentVolumeClaim:
            claimName: database-persistent-volume-claim 
      containers:
        - name: postgres
          image: postgres:12-alpine
          ports:
            - containerPort: 5432
          volumeMounts: 
            - name: postgres-storage
              mountPath: /var/lib/postgresql/data 
              subPath: postgres
          env:
            - name: POSTGRES_PASSWORD
              valueFrom:
                secretKeyRef:
                  name: pgpassword
                  key: PGPASSWORD

在尝试为 web 容器与 postgres 容器建立连接时，我遇到了以下问题：

  File "/usr/local/lib/python3.8/site-packages/sqlalchemy/util/compat.py", line 211, in raise_
    raise exception
  File "/usr/local/lib/python3.8/site-packages/sqlalchemy/pool/base.py", line 599, in __connect
    connection = pool._invoke_creator(self)
  File "/usr/local/lib/python3.8/site-packages/sqlalchemy/engine/create.py", line 578, in connect
    return dialect.connect(*cargs, **cparams)
  File "/usr/local/lib/python3.8/site-packages/sqlalchemy/engine/default.py", line 584, in connect
    return self.dbapi.connect(*cargs, **cparams)
  File "/usr/local/lib/python3.8/site-packages/psycopg2/__init__.py", line 127, in connect
    conn = _connect(dsn, connection_factory=connection_factory, **kwasync)

psycopg2.OperationalError: FATAL:  password authentication failed for user "username"

Answer 1

我成功修复了它！

错误在于，我只是在 posgres_deployment.yaml 文件中提到了密码，但我还应该提到数据库名称和用户名，web_deployment.yaml 试图使用它们来访问此数据库服务。

现在新的 postgres_deployment.yaml 文件，经过更正后，如下所示：

apiVersion: apps/v1
kind: Deployment 
metadata:
  name: postgres-deployment 
spec: 
  replicas: 1 
  selector:
    matchLabels:
      component: postgres 
  template:
    metadata:
      labels:
        component: postgres
    spec: 
      volumes: 
        - name: postgres-storage
          persistentVolumeClaim:
            claimName: database-persistent-volume-claim 
      containers:
        - name: postgres
          image: postgres:12-alpine
          ports:
            - containerPort: 5432
          volumeMounts: 
            - name: postgres-storage
              mountPath: /var/lib/postgresql/data 
              subPath: postgres
          env:
            - name: POSTGRES_USER
              value: username
            - name: POSTGRES_DB
              value: postgres_db
            - name: POSTGRES_PASSWORD
              valueFrom:
                secretKeyRef:
                  name: pgpassword
                  key: PGPASSWORD

psycopg2.OperationalError：致命：Minikube 中用户“用户名”的密码验证失败

1 个答案: