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"
docker-compose up -d
以及使用“网络”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
当我然后使用时,docker inspect docker_cassandra_1
我看到它有这个 IP 地址 - 所以分辨率工作正常:
"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,我看到该节点知道它的 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 NORMAL 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 cassandra_1 INFO [main] 2018-11-04 10:06:46,379 NativeTransportService.java:70 - Netty 使用本机 Epoll 事件循环 cassandra_1 | INFO [main] 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 inspect web
我看到它没有 IP 地址并且卡在重新启动时(除非强制删除图像,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
}
}
码头工人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 解析到的那个)
这里有什么问题?
编辑。:
没有提到:docker exec -it docker_cassandra_1 cqlsh
让我连接到数据库 - 所以它显然是
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”容器上运行的
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 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:
当我在主机上启动我的应用程序并尝试连接到 127.0.0.1 时,它也不起作用,而端口 9042 通过 -p 9042:9042 暴露