Golang 与 Cassandra db 使用 docker-compose：无法连接（gocql）

发布于 2025-01-12 17:49:38 字数 1121 浏览 6 评论 0 原文

我正在尝试设置 cassandra DB 并使用 golang 应用程序连接到它。

这是我的 docker-compose


version: "3.6"

services:
  cassandra:
    image: cassandra:4.0
    ports:
      - 9042:9042
    volumes:
      - ~/apps/cassandra:/var/lib/cassandra
    environment:
      - CASSANDRA_CLUSTER_NAME=mycluster

  myapp:
    ...
    ports:
      - 4242:4242
      - 4243:4243
    depends_on:
      - cassandra
      ...

networks:
  default:
    driver: bridge

启动 Cassandra

我使用docker-compose up cassandra

，然后等待它准备就绪。

然后我尝试在本地使用连接到 Cassandra

> cqlsh
Connected to mycluster at 127.0.0.1:9042

，然后尝试使用 gocql 在我的 go 应用程序（dockerized）中连接到它

    cluster := gocql.NewCluster("127.0.0.1")
    session, err := cluster.CreateSession()

（还尝试将元素添加为 Consistency， ProtoVersion=4 等相同的结果）

然后它说：

Cannot connect to db: gocql: unable to create session: unable to discover protocol version: dial tcp 127.0.0.1:9042: connect: connection refused

你呢。知道为什么无法连接吗？

谢谢！

原文

I am trying to setup a cassandra DB and connect to it with a golang app.

this is my docker-compose


version: "3.6"

services:
  cassandra:
    image: cassandra:4.0
    ports:
      - 9042:9042
    volumes:
      - ~/apps/cassandra:/var/lib/cassandra
    environment:
      - CASSANDRA_CLUSTER_NAME=mycluster

  myapp:
    ...
    ports:
      - 4242:4242
      - 4243:4243
    depends_on:
      - cassandra
      ...

networks:
  default:
    driver: bridge

I start the Cassandra using

docker-compose up cassandra

and then I wait it to be ready.

Then I try to connect to Cassandra in local using

> cqlsh
Connected to mycluster at 127.0.0.1:9042

and then I try to connect to it in my go app (dockerized) using gocql

    cluster := gocql.NewCluster("127.0.0.1")
    session, err := cluster.CreateSession()

( also tried to add element as Consistency, ProtoVersion=4 etc. same results)

it says then :

Cannot connect to db: gocql: unable to create session: unable to discover protocol version: dial tcp 127.0.0.1:9042: connect: connection refused

Do you. have any idea why it can't connect?

thanks !

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忆沫 2025-01-19 17:49:38

每个容器都有自己的本地主机 (127.0.0.1) 地址 - 您需要连接到您计算机的 IP 地址（如果您使用 bridge），或者最好通过以下方式连接名称 (cassandra)

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︶￣淡然 2025-01-19 17:49:38

如果两个容器都使用桥接网络，则需要在两个容器和应用程序容器中指定网络名称，主机将是 cassandra (docker) 容器。

services:
  cassandra:
    image: cassandra:4.0
    container_name: cassandra
    
    ports:
      - 9042:9042

    volumes:
      - ~/apps/cassandra:/var/lib/cassandra

    networks:
      - default
    environment:
      - CASSANDRA_CLUSTER_NAME=mycluster

  myapp:
    ...
    ports:
      - 4242:4242
      - 4243:4243
    depends_on:
      - cassandra
    networks:
      - default

    environment:
      - HOSTS=cassandra
      ...

networks:
  default:
    driver: bridge

If both containers using bridge network you need to specify the network name in both containers and in your app container the host will be cassandra (docker) container.

services:
  cassandra:
    image: cassandra:4.0
    container_name: cassandra
    
    ports:
      - 9042:9042

    volumes:
      - ~/apps/cassandra:/var/lib/cassandra

    networks:
      - default
    environment:
      - CASSANDRA_CLUSTER_NAME=mycluster

  myapp:
    ...
    ports:
      - 4242:4242
      - 4243:4243
    depends_on:
      - cassandra
    networks:
      - default

    environment:
      - HOSTS=cassandra
      ...

networks:
  default:
    driver: bridge

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