Can't connect remotely to a server

[go-micro]

Can't connect remotely to a server

[asim]

Thanks for raising the issue. The way in which a service registers, it blindly uses the server listener address provided rather than figuring out the appropriate IP of the machine or allow you to specify and advertising address. The quick fix is to set server.Address("10.0.0.1:8080") to the private ip of the host. I'll put together a more elegant solution that will either allow the separation of listen and advertise address much like consul does. Any thoughts or PRs welcome.

[jbrodriguez]

Thank you @asim , the quick fix worked !

[asim]

I've committed a fix here 0dbe14a. When 0.0.0.0 is specified as the bind address it will extract the private ip and use that for registration. Please close the issue if to satisfaction.

[jbrodriguez]

Not sure if this is the way to do it, but it's not working here

    server.Init(
        server.Name("io.jbrodriguez.mediagui.scanner."+host),
        server.Address("0.0.0.0:0"),
    )

root@wopr:~# /boot/scanner -logtostderr
I1104 17:03:34.004338    7537 scanner.go:55] Scanner started
I1104 17:03:34.004415    7537 server.go:96] Starting server io.jbrodriguez.mediagui.scanner.wopr id io.jbrodriguez.mediagui.scanner.wopr-e43c7501-833f-11e5-9483-d05099660776
I1104 17:03:34.004576    7537 rpc_server.go:222] Listening on 0.0.0.0:39241
I1104 17:03:34.004666    7537 http_broker.go:80] Broker Listening on 0.0.0.0:43409
I1104 17:03:34.004720    7537 rpc_server.go:152] Registering node: io.jbrodriguez.mediagui.scanner.wopr-e43c7501-833f-11e5-9483-d05099660776

[
  {
    "Node": "io.jbrodriguez.mediagui.scanner.wopr-e43c7501-833f-11e5-9483-d05099660776",
    "Address": "0.0.0.0",
    "ServiceID": "io.jbrodriguez.mediagui.scanner.wopr-e43c7501-833f-11e5-9483-d05099660776",
    "ServiceName": "io.jbrodriguez.mediagui.scanner.wopr",
    "ServiceTags": [
      "e={\"Name\":\"Scanner.Scan\",\"Request\":{\"Name\":\"Request\",\"Type\":\"Request\",\"Values\":[{\"Name\":\"Folders\",\"Type\":\"\",\"Values\":null}]},\"Response\":{\"Name\":\"Response\",\"Type\":\"Response\",\"Values\":[{\"Name\":\"Filenames\",\"Type\":\"\",\"Values\":null}]},\"Metadata\":{\"stream\":\"false\"}}",
      "e={\"Name\":\"Debug.Health\",\"Request\":{\"Name\":\"Request\",\"Type\":\"Request\",\"Values\":null},\"Response\":{\"Name\":\"Response\",\"Type\":\"Response\",\"Values\":[{\"Name\":\"Status\",\"Type\":\"string\",\"Values\":null}]},\"Metadata\":{\"stream\":\"false\"}}"
    ],
    "ServiceAddress": "",
    "ServicePort": 39241
  }
]

[jbrodriguez]

I think this line will never evaluate to true

0dbe14a#diff-83b1f985ddf5acc292d6df4ede4b6395R143

[asim]

Does your machine have private ips?

[jbrodriguez]

Yes, 192.168.23.x

[asim]

The IPs are assigned on the machine and you can see them if you do ifconfig?

[jbrodriguez]

Yes, I have docker running but that's a different issue

root@wopr:~# ifconfig
docker0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.17.42.1  netmask 255.255.0.0  broadcast 0.0.0.0
        ether 36:dd:68:31:e1:d2  txqueuelen 0  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 558  bytes 72965 (71.2 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.23.72  netmask 255.255.255.0  broadcast 192.168.23.255
        ether d0:50:99:66:07:76  txqueuelen 1000  (Ethernet)
        RX packets 438818  bytes 481549074 (459.2 MiB)
        RX errors 0  dropped 1817  overruns 0  frame 0
        TX packets 210916  bytes 107895564 (102.8 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 20  memory 0xefd00000-efd20000

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        loop  txqueuelen 0  (Local Loopback)
        RX packets 2925  bytes 35495980 (33.8 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 2925  bytes 35495980 (33.8 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

I'm running your code inside the service handler and it works

    for _, b := range []string{"10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16"} {
        if _, block, err := net.ParseCIDR(b); err == nil {
            privateBlocks = append(privateBlocks, block)
        }
    }

    addrs, err := net.InterfaceAddrs()
    if err != nil {
        log.Info("Oops: " + err.Error() + "\n")
        os.Exit(1)
    }

    ip := "0.0.0.0"
    for _, a := range addrs {
        if ipnet, ok := a.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
            if ipnet.IP.To4() != nil {
                for _, priv := range privateBlocks {
                    tip := net.ParseIP(ipnet.IP.String())
                    if priv.Contains(tip) {
                        log.Info("inside")
                        ip = ipnet.IP.String()
                    }
                }
                // if strings.Contains(ipnet.IP.String(), "192.168.0.0/16") {
                //  ip = ipnet.IP.String()
            }
        }
    }

    log.Infof("Ip=%s", ip)

outputs

root@wopr:~# /boot/scanner -logtostderr
I1104 17:24:29.243671    3652 scanner.go:46] inside
I1104 17:24:29.243757    3652 scanner.go:46] inside
I1104 17:24:29.243780    3652 scanner.go:56] Ip=172.17.42.1
I1104 17:24:29.243826    3652 scanner.go:71] Scanner started
I1104 17:24:29.243847    3652 server.go:96] Starting server io.jbrodriguez.mediagui.scanner.wopr id io.jbrodriguez.mediagui.scanner.wopr-d06a9fb1-8342-11e5-b6a2-d05099660776
I1104 17:24:29.243953    3652 rpc_server.go:222] Listening on 0.0.0.0:38084
I1104 17:24:29.244032    3652 http_broker.go:80] Broker Listening on 0.0.0.0:47733
I1104 17:24:29.244103    3652 rpc_server.go:152] Registering node: io.jbrodriguez.mediagui.scanner.wopr-d06a9fb1-8342-11e5-b6a2-d05099660776
^CI1104 17:26:00.164628    3652 server.go:85] Received signal interrupt
I1104 17:26:00.164654    3652 rpc_server.go:196] Deregistering node: io.jbrodriguez.mediagui.scanner.wopr-d06a9fb1-8342-11e5-b6a2-d05099660776
I1104 17:26:00.166701    3652 server.go:101] Stopping server
root@wopr:~# /boot/scanner -logtostderr
I1104 17:26:14.362823    6063 scanner.go:46] inside
I1104 17:26:14.362917    6063 scanner.go:46] inside
I1104 17:26:14.362950    6063 scanner.go:56] Ip=172.17.42.1
I1104 17:26:14.363032    6063 scanner.go:71] Scanner started
I1104 17:26:14.363089    6063 server.go:96] Starting server io.jbrodriguez.mediagui.scanner.wopr id io.jbrodriguez.mediagui.scanner.wopr-0f129758-8343-11e5-b8a2-d05099660776
I1104 17:26:14.363253    6063 rpc_server.go:222] Listening on 0.0.0.0:46509
I1104 17:26:14.363343    6063 http_broker.go:80] Broker Listening on 0.0.0.0:48304
I1104 17:26:14.363398    6063 rpc_server.go:152] Registering node: io.jbrodriguez.mediagui.scanner.wopr-0f129758-8343-11e5-b8a2-d05099660776
^CI1104 17:26:22.837228    6063 server.go:85] Received signal interrupt
I1104 17:26:22.837351    6063 rpc_server.go:196] Deregistering node: io.jbrodriguez.mediagui.scanner.wopr-0f129758-8343-11e5-b8a2-d05099660776
I1104 17:26:22.840463    6063 server.go:101] Stopping server

[asim]

Did you do go get -u? Perhaps the library was not rebuilt the first time. The behaviour suggests it wasn't updated.

[jbrodriguez]

That was it.

Thanks @asim !!