创建 Docker Compose 中的 DynamoDB 表格。

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英文:

Create DynamoDB table in Docker Compose

问题

I'm using Docker Compose for testing to replicate my AWS infrastructure which uses CloudFormation. My CloudFormation template creates a FooBars DynamoDB table, and I want to do the same for my Docker Compose setup.

I add a DynamoDB Local service:

  foobar-service-db:
    image: amazon/dynamodb-local:latest
    command: "-jar DynamoDBLocal.jar -inMemory"
    ports: [8090:8000]
    restart: always

When I run docker compose …, I can then use aws dynamodb create-table to create a table using --endpoint-url http://localhost:8090 and --region dummy-region. Great. I want to do that as part of Docker Compose, so I add this "service":

  foobar-service-db-init:
    depends_on:
      - foobar-service-db
    image: amazon/aws-cli
    environment:
      AWS_ACCESS_KEY_ID: dummy-key-id
      AWS_SECRET_ACCESS_KEY: dummy-key
    command: |
      dynamodb create-table
          --table-name FooBars
          --attribute-definitions
              AttributeName=id,AttributeType=S
          --key-schema
              AttributeName=id,KeyType=HASH
          --billing-mode PAY_PER_REQUEST
          --endpoint-url http://foobar-service-db:8000 --region dummy-region      

(Note that I have to indicate the container port instead of the host port because the request is inside the Docker Compose network.)

I can see the output when Docker Compose starts up, and it shows that a table with an ARN of arn:aws:dynamodb:ddblocal:000000000000:table/FooBars was created. But when I try aws dynamodb list-tables --endpoint-url http://localhost:8090 --region dummy-region from the command line, no tables are listed.

However, on the command line, I can create the table using aws dynamodb create-table … --endpoint-url http://localhost:8090 --region dummy-region, which should be equivalent to what foobar-service-db-init is calling. This command also says it created a table with ARN arn:aws:dynamodb:ddblocal:000000000000:table/FooBars. And if I run the same command again, it says "Cannot create preexisting table" as expected.

So foobar-service-db-init inside Docker Compose seems to be creating the table somewhere else, where it doesn't show up when I make the request from the command line. But where else could it be creating it? There is only one DynamoDB Local service, foobar-service-db!

英文:

I'm using Docker Compose for testing to replicate my AWS infrastructure which uses CloudFormation. My CloudFormation template create a FooBars DynamoDB table and I want to do the same for my Docker Compose setup.

I add a DynamoDB Local service:

  foobar-service-db:
    image: amazon/dynamodb-local:latest
    command: "-jar DynamoDBLocal.jar -inMemory"
    ports: [8090:8000]
    restart: always

When I run docker compose … I can then use aws dynamodb create-table to create a table using --endpoint-url http://localhost:8090 and --region dummy-region. Great. I want to do that as part of Docker Compose, so I add this "service":

  foobar-service-db-init:
    depends_on:
      - foobar-service-db
    image: amazon/aws-cli
    environment:
      AWS_ACCESS_KEY_ID: dummy-key-id
      AWS_SECRET_ACCESS_KEY: dummy-key
    command: >-
      dynamodb create-table
          --table-name FooBars
          --attribute-definitions
              AttributeName=id,AttributeType=S
          --key-schema
              AttributeName=id,KeyType=HASH
          --billing-mode PAY_PER_REQUEST
          --endpoint-url http://foobar-service-db:8000 --region dummy-region

(Note that I have to indicate the container port instead of the host port, because the request is inside the Docker Compose network.)

I can see the output when Docker Compose starts up, and it shows that a table with an ARN of arn:aws:dynamodb:ddblocal:000000000000:table/FooBars was created. But when I try aws dynamodb list-tables --endpoint-url http://localhost:8090 --region dummy-region from the command line, no tables are listed.

However on the command line I can create the table using aws dynamodb create-table … --endpoint-url http://localhost:8090 --region dummy-region, which should be equivalent what foobar-service-db-init is calling. This command also says is created a table with ARN arn:aws:dynamodb:ddblocal:000000000000:table/FooBars was created. And if I run the same command again, it says "Cannot create preexisting table" as expected.

So foobar-service-db-init inside Docker Compose seems to be creating the table somewhere else, where it doesn't show up when I make the request from the command line. But where else could it be creating it? There is only one DynamoDB Local service, foobar-service-db!

(From the command line I'm using my actual AWS credentials. But that shouldn't make a difference. Surely DynamoDB Local doesn't have a separate namespace based on user identity—that's not how it works on AWS itself. The namespace is based on region, and I specify the same dummy-region.)

答案1

得分: 1

尝试使用 -sharedDb

command: "-jar DynamoDBLocal.jar -inMemory -sharedDb"
  • 如果使用 -sharedDb 选项,DynamoDB 将创建一个名为 shared-local-instance.db 的单一数据库文件。连接到 DynamoDB 的每个程序都会访问此文件。如果删除该文件,您将丢失其中存储的任何数据。

  • 如果省略 -sharedDb,则数据库文件将以 AWS 访问密钥 ID 和 AWS 区域在应用程序配置中的显示方式命名为 myaccesskeyid_region.db。如果删除该文件,您将丢失其中存储的任何数据。

英文:

Try using -sharedDb:

command: "-jar DynamoDBLocal.jar -inMemory -sharedDb"
  • If you use the -sharedDb option, DynamoDB creates a single database file named shared-local-instance.db. Every program that connects to DynamoDB accesses this file. If you delete the file, you lose any data that you have stored in it.

  • If you omit -sharedDb, the database file is named myaccesskeyid_region.db, with the AWS access key ID and AWS Region as they appear in your application configuration. If you delete the file, you lose any data that you have stored in it.

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  • 本文由 发表于 2023年6月12日 22:03:55
  • 转载请务必保留本文链接:https://go.coder-hub.com/76457440.html
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