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gocql + docker“未找到”

来源：stackoverflow

时间：2024-04-23 10:03:31 326浏览收藏

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问题内容

我有一个像这样设置的 docker compose 文件：

version: "3"
services:
  web:
    image: myapp
    container_name: web
    environment:
      cassandra_hosts: "db"
    ports:
      - "8080:8080"
    restart: unless-stopped
    depends_on:
      - cassandra
    links:
      - cassandra:db
  cassandra:
    image: cassandra
    restart: unless-stopped
    ports:
      - "9042:9042"
    expose:
      - "9042"
      - "7000"
      - "7001"
      - "9160"
    volumes:
      - "/private/cassandra_docker/:/var/lib/cassandra"

当使用 docker-compose up -d 'web' 日志启动服务时：

2018/11/04 13:01:33 gocql: unable to create session: control: unable to connect to initial hosts: dial tcp 172.19.0.2:9042: connect: connection refused
2018/11/04 13:01:39 gocql: unable to dial control conn 172.19.0.2: dial tcp 172.19.0.2:9042: connect: connection refused
2018/11/04 13:01:39 could not open session with cassandra
2018/11/04 13:01:39 gocql: unable to create session: control: unable to connect to initial hosts: dial tcp 172.19.0.2:9042: connect: connection refused
2018/11/04 13:01:53 gocql: session.handlenodeup: 172.19.0.2:9042
2018/11/04 13:01:53 not found
2018/11/04 13:02:19 gocql: session.handlenodeup: 172.19.0.2:9042
2018/11/04 13:02:19 not found

当我使用 docker 检查 docker_cassandra_1 时，我看到它有这个 ip 地址 - 所以解析工作正常：

"networks": {
                "docker_default": {
                    "ipamconfig": null,
                    "links": null,
                    "aliases": [
                        "101ae9d068ce",
                        "cassandra"
                    ],
                    "networkid": "9b416bdf21c152a7d751c264b9f42799534800f08b17ada6d90ee92d62c390bc",
                    "endpointid": "bc2fe3cc3fb9967e0e056d24a98b97afbc856d54f7695f8e7cfb2583a397285a",
                    "gateway": "172.19.0.1",
                    "ipaddress": "172.19.0.2",
                    "ipprefixlen": 16,
                    "ipv6gateway": "",
                    "globalipv6address": "",
                    "globalipv6prefixlen": 0,
                    "macaddress": "02:42:ac:13:00:02"
                }
            }

在 cassandra 的日志中，我看到节点知道它的 ip 地址是什么，并且它也在侦听正确的端口：

10:06:37,709 storageservice.java:2289 - 节点 /172.19.0.2 状态跳转到普通 cassandra_1 info [main] 2018-11-04 10:06:37,737 gossiper.java:1692 - 等待八卦解决...... cassandra_1 info [main] 2018-11-04 10:06:45,745 gossiper.java:1723 - 没有八卦积压；进行中 cassandra_1 资讯 [主要] 2018-11-04 10:06:46,379 nativetransportservice.java:70 - 使用本机 epoll 的 netty 事件循环 cassandra_1 |信息 [主要] 2018-11-04 10:06:46,496 ... 开始在 /0.0.0.0:9042（未加密）上侦听 cql 客户端...

当 docker 检查 web 时，我发现它没有 ip 地址并且卡在重新启动中（除非强制删除映像，否则无法停止：

"networks": {
                "docker_default": {
                    "ipamconfig": null,
                    "links": [
                        "docker_cassandra_1_9415bd9be111:cassandra_1_9415bd9be111",
                        "docker_cassandra_1_9415bd9be111:db",
                        "docker_cassandra_1_9415bd9be111:docker_cassandra_1_9415bd9be111"
                    ],
                    "aliases": [
                        "82f1f884ee5f",
                        "web"
                    ],
                    "networkid": "9b416bdf21c152a7d751c264b9f42799534800f08b17ada6d90ee92d62c390bc",
                    "endpointid": "",
                    "gateway": "",
                    "ipaddress": "",
                    "ipprefixlen": 0,
                    "ipv6gateway": "",
                    "globalipv6address": "",
                    "globalipv6prefixlen": 0,
                    "macaddress": "",
                    "driveropts": null
                }
            }

docker ps：

container id        image               command                  created             status                         ports                                                       names
82f1f884ee5f        myapp               "/bin/bash -c '/runa…"   6 minutes ago       restarting (1) 5 minutes ago                                                               web
b3713664e748        cassandra           "docker-entrypoint.s…"   6 minutes ago       up 6 minutes                   7000-7001/tcp, 7199/tcp, 9160/tcp, 0.0.0.0:9042->9042/tcp   docker_cassandra_1

我还检查了 cassandra 中的 system.local 表 - 所有地址都是正确的（docker dns 解析到的地址）

这里有什么问题吗？

编辑：

未能提及：docker exec -it docker_cassandra_1 cqlsh 让我连接到数据库 - 所以它显然已启动

编辑2：

我做了一些进一步的测试，并在 myapp 容器上安装了 nmap（并将其更改为在启动时运行 /bin/bash 而不是我的入口点脚本）

这是在“web”容器上运行

starting nmap 7.60 ( https://nmap.org ) at 2018-11-04 14:13 utc
nmap scan report for db (172.19.0.2)
host is up (0.000061s latency).
rdns record for 172.19.0.2: docker_cassandra_1.docker_default

port     state service
9042/tcp open  unknown
mac address: 02:42:ac:13:00:02 (unknown)

nmap done: 1 ip address (1 host up) scanned in 0.47 seconds
root@028dcea32e53:/run.sh 
2018/11/04 14:14:01 gocql: session.handlenodeup: 172.19.0.2:9042
2018/11/04 14:14:01 not found

docker exec -it docker_cassandra_1 /bin/bash

让我通过外部 ip 进行连接

csqlsh 172.19.0.2
connected to test cluster at 172.19.0.2:9042.
[cqlsh 5.0.1 | cassandra 3.11.3 | cql spec 3.4.4 | native protocol v4]

这是我连接的代码：

cluster := gocql.NewCluster("db")
    cluster.Keyspace = "myApp"
    cluster.ProtoVersion = 4
    cluster.Consistency = gocql.One
    var err error
    DataSource.Client, err = cluster.CreateSession()

编辑：

当我在主机上启动应用程序并尝试连接到 127.0.0.1，而端口 9042 通过 -p 9042:9042 公开时，它也不起作用