Postgres 问题 - Ruby on Rails (Postgres) on Google Container Engine

Question

运行遇到一个小问题，我希望有人能指出正确的方向。我运行一个 Rails+Postgres 多容器，它们启动正常，除了 rails 在我尝试访问 LoadBalancer 的 IP 时在日志中显示：

PG::ConnectionBad (could not connect to server: No such file or directory
Is the server running locally and accepting connections on
Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?):

我的两个容器pod文件和我的database.yml如下：

RAILS POD

apiVersion: v1
kind: Pod
metadata:
  name: cartelhouse
  labels:
    name: cartelhouse
spec:
  containers:
    - image: gcr.io/xyz/cartelhouse:v6
      name: cartelhouse
      env:
        - name: POSTGRES_PASSWORD
          # Change this - must match postgres.yaml password.
          value: mypassword
        - name: POSTGRES_USER
          value: rails
      ports:
        - containerPort: 80
          name: cartelhouse
      volumeMounts:
          # Name must match the volume name below.
        - name: cartelhouse-persistent-storage
          # Mount path within the container.
          mountPath: /var/www/html
  volumes:
    - name: cartelhouse-persistent-storage
      gcePersistentDisk:
        # This GCE persistent disk must already exist.
        pdName: rails-disk
        fsType: ext4

POSTGRES POD

apiVersion: v1
kind: Pod
metadata:
  name: postgres
  labels:
    name: postgres
spec:
  containers:
    - name: postgres
      image: postgres
      env:
        - name: POSTGRES_PASSWORD
          value: mypassword
        - name: POSTGRES_USER
          value: rails
        - name: PGDATA
          value: /var/lib/postgresql/data/pgdata
      ports:
        - containerPort: 5432
          name: postgres        
      volumeMounts:
        - name: postgres-persistent-storage
          mountPath: /var/lib/postgresql/data
  volumes:
    - name: postgres-persistent-storage
      gcePersistentDisk:
        # This disk must already exist.
        pdName: postgres-disk
        fsType: ext4

DATABASE.YML 文件


production:
  <<: *default
  adapter: postgresql
  encoding: unicode
  database: app_production
  username: <%= ENV['PG_ENV_POSTGRES_USER'] %>
  password: <%= ENV['PG_ENV_POSTGRES_PASSWORD'] %>
  host:     <%= ENV['PG_PORT_5432_TCP_ADDR'] %>

我认为这是一个链接问题，或者与我指定的 PGDATA 路径有关？

Answer 1

您的 Rails pod 看起来配置为与本地的 postgres 实例运行对话。您需要将其配置为与 postgres pod 或服务的 IP 地址通信。

Answer 2

感谢@alex-robinson 的指导，他的回答是正确的，尽管原始 post 的配置还有另一个问题：

解决方案是用 username/password 的正确 ENV 变量修改 database.yml（它们与 OP 中 YAML 设置的 ENV 变量不匹配），正如 Alex 提到的那样，将服务名称用于主机名。

production:
  <<: *default
  adapter: postgresql
  encoding: unicode
  database: rails_production
  username: <%= ENV['POSTGRES_USER'] %>
  password: <%= ENV['POSTGRES_PASSWORD'] %>
  host:     postgres

Postgres 问题 - Ruby on Rails (Postgres) on Google Container Engine

Postgres issue - Ruby on Rails (Postgres) on Google Container Engine

postgresql

ruby-on-rails

docker

google-kubernetes-engine

RAILS POD

POSTGRES POD

DATABASE.YML 文件