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Golang gocql无法连接到Cassandra(使用Docker)

docker-compose cassandra go docker database

Peter Weyand · 技术社区 · 6 年前

我能找到的最接近解决golang之间连接问题的信息 gocql Cassandra cqlsh - connection refused

这个问题应该略有不同,因为它是使用Docker和我尝试了大多数(如果不是所有的解决方案链接到上面)。

version: "3"  
services:  
  cassandra00:
    restart: always
    image: cassandra:latest
    volumes: 
      - ./db/casdata:/var/lib/cassandra
    ports: 
      - 7000:7000
      - 7001:7001
      - 7199:7199
      - 9042:9042
      - 9160:9160
    environment:
      - CASSANDRA_RPC_ADDRESS=127.0.0.1
      - CASSANDRA_BROADCAST_ADDRESS=127.0.0.1
      - CASSANDRA_LISTEN_ADDRESS=127.0.0.1
      - CASSANDRA_START_RPC=true
  db:
    restart: always
    build: ./db
    environment:
      POSTGRES_USER: patientplatypus
      POSTGRES_PASSWORD: SUPERSECRETFAKEPASSD00T
      POSTGRES_DB: zennify
    expose:
      - "5432"
    ports:
      - 5432:5432
    volumes:
      - ./db/pgdata:/var/lib/postgresql/data
  app:
    restart: always
    build: 
      context: .
      dockerfile: Dockerfile
    command: bash -c 'while !</dev/tcp/db/5432; do sleep 10; done; realize start --run'
    # command: bash -c 'while !</dev/tcp/db/5432; do sleep 10; done; go run main.go'
    ports:
      - 8000:8000
    depends_on:
      - db
      - cassandra00
    links:
      - db
      - cassandra00
    volumes:
      - ./:/go/src/github.com/patientplatypus/webserver/

诚然,我有点不确定我应该把什么样的倾听地址传给环境部分的卡桑德拉,所以我只通过了“家”:

  - CASSANDRA_RPC_ADDRESS=127.0.0.1
  - CASSANDRA_BROADCAST_ADDRESS=127.0.0.1
  - CASSANDRA_LISTEN_ADDRESS=127.0.0.1

如果你试着通过 0.0.0.0

cassandra00_1  | Exception (org.apache.cassandra.exceptions.ConfigurationException) encountered during startup: listen_address cannot be a wildcard address (0.0.0.0)!
cassandra00_1  | listen_address cannot be a wildcard address (0.0.0.0)!
cassandra00_1  | ERROR [main] 2018-09-10 21:50:44,530 CassandraDaemon.java:708 - Exception encountered during startup: listen_address cannot be a wildcard address (0.0.0.0)!

但是,总的来说,我认为我得到了正确的Cassandra(afaict)启动程序,因为我的终端输出Cassandra正常启动,并且正在监听相应的端口:

cassandra00_1  | INFO  [main] 2018-09-10 22:06:28,920 StorageService.java:1446 - JOINING: Finish joining ring
cassandra00_1  | INFO  [main] 2018-09-10 22:06:29,179 StorageService.java:2289 - Node /127.0.0.1 state jump to NORMAL
cassandra00_1  | INFO  [main] 2018-09-10 22:06:29,607 NativeTransportService.java:70 - Netty using native Epoll event loop
cassandra00_1  | INFO  [main] 2018-09-10 22:06:29,750 Server.java:155 - Using Netty Version: [netty-buffer=netty-buffer-4.0.44.Final.452812a, netty-codec=netty-codec-4.0.44.Final.452812a, netty-codec-haproxy=netty-codec-haproxy-4.0.44.Final.452812a, netty-codec-http=netty-codec-http-4.0.44.Final.452812a, netty-codec-socks=netty-codec-socks-4.0.44.Final.452812a, netty-common=netty-common-4.0.44.Final.452812a, netty-handler=netty-handler-4.0.44.Final.452812a, netty-tcnative=netty-tcnative-1.1.33.Fork26.142ecbb, netty-transport=netty-transport-4.0.44.Final.452812a, netty-transport-native-epoll=netty-transport-native-epoll-4.0.44.Final.452812a, netty-transport-rxtx=netty-transport-rxtx-4.0.44.Final.452812a, netty-transport-sctp=netty-transport-sctp-4.0.44.Final.452812a, netty-transport-udt=netty-transport-udt-4.0.44.Final.452812a]
cassandra00_1  | INFO  [main] 2018-09-10 22:06:29,754 Server.java:156 - Starting listening for CQL clients on /127.0.0.1:9042 (unencrypted)...
cassandra00_1  | INFO  [main] 2018-09-10 22:06:29,990 ThriftServer.java:116 - Binding thrift service to /127.0.0.1:9160

在我的golang代码中,调用了以下包(简化为显示相关部分):

package data

import(
    "fmt"
    "github.com/gocql/gocql"
)

func create_userinfo_table() {
    <...>
    fmt.Println("replicating table in cassandra")
    cluster := gocql.NewCluster("localhost") //<---error here!
    cluster.ProtoVersion = 4
    <...>
}

app_1          | [21:52:38][WEBSERVER] : 2018/09/10 
21:52:38 gocql: unable to dial control conn 127.0.0.1: 
dial tcp 127.0.0.1:9042: connect: connection refused

app_1          | [21:52:38][WEBSERVER] : 2018/09/10 
21:52:38 gocql: unable to dial control conn ::1: 
dial tcp [::1]:9042: connect: cannot assign requested address

app_1          | [21:52:38][WEBSERVER] : 2018/09/10 
21:52:38 Could not connect to cassandra cluster: gocql: 
unable to create session: control: unable to connect to initial hosts: 
dial tcp [::1]:9042: connect: cannot assign requested address

我试过几种不同的连接地址

cluster := gocql.NewCluster("localhost")

cluster := gocql.NewCluster("127.0.0.1")

cluster := gocql.NewCluster("127.0.0.1:9042")

cluster := gocql.NewCluster("127.0.0.1:9160")

例如,这些人似乎很可能成为候选人,但运气不佳。

有人知道我做错了什么吗?

1 回复 | 直到 6 年前

gazarsgo 6 年前

使用服务名称 cassandra00 对于docker compose文档中的主机名 https://docs.docker.com/compose/compose-file/#links

离开 CASSANDRA_LISTEN_ADDRESS envvar unset(或pass auto https://docs.docker.com/samples/library/cassandra/

默认值是auto,它将在中设置listen\u address选项卡桑德拉.亚马尔容器启动时的IP地址。这个默认值应该适用于大多数用例。