Fabio: Q: Can't Load Docker Container

[digiman999]

On Centos7, I can't get the fabio Docker container working

Consul& Registrator

docker run -d --name consul -p 8500:8500 -p 172.17.0.1:53:8600/udp -p 8400:8400 gliderlabs/consul-server -node myconsul -bootstrap
docker run -d --name registrator -v /var/run/docker.sock:/tmp/docker.sock --net=host gliderlabs/registrator -internal consul://localhost:8500

both work fine, on default setups/ports

Bin
/usr/local/bin/fabio binary works fine

Trying Fabio Container

docker run -d -p 9999:9999 -p 9998:9998 -v content/config$PWD/fabio/fabio.properties:/etc/fabio/fabio.properties magiconair/fabio

This creates the container but exits it immediately, and won't start thereafter. Tried running /usr/local/bin/fabio concurrently, but no joy

Any ideas?
Regards

[magiconair]

Don't you have to map port 8500 into the fabio container as well if you're running it like this? Sorry, Docker noob here.

[magiconair]

Also, what do the fabio logs say? If they can't get to consul then you should see this:

2017/01/29 20:04:58 [FATAL] Error initializing backend. Get http://localhost:8500/v1/agent/self: dial tcp [::1]:8500: getsockopt: connection refused

[digiman999]

Hi Frank, thanks for the response. Adding -p 8500:8500 gives

docker: Error response from daemon: driver failed programming external connectivity on endpoint fabio3 (61a7aa092b0486bc33157b996b52c0c44a22208029d75fa321d953bb8d472a86): Bind for 0.0.0.0:8500 failed: port is already allocated.

8500 is already allocated for Consul.

Not sure if I can access the logs because it looks like they're inside the (would be) container.

[magiconair]

You can't map port 8500 into different containers but don't you have to tell fabio where to find consul? It will be looking for localhost:8500 but that would be inside the container. So either you map your external consul endpoint into the container (not sure whether that's even possible) so that localhost:8500 is reachable from within the container or you need to provide -registry.consul.addr <consul ip>:8500 to fabio.

[magiconair]

Re logs: a quick search reveals a docker logs <container name> command. That should tell you more.

[magiconair]

You've got an update on this?

[digiman999]

**docker run -d -p 443:443 -p 9998:9998 magiconair/fabio**

creates a container but exits immediately. docker logs <id> shows

[INFO] Runtime config
{
    "Proxy": {
        "Strategy": "rnd",
        "Matcher": "prefix",
        "NoRouteStatus": 404,
        "MaxConn": 10000,
        "ShutdownWait": 0,
        "DialTimeout": 30000000000,
        "ResponseHeaderTimeout": 0,
        "KeepAliveTimeout": 0,
        "FlushInterval": 1000000000,
        "LocalIP": "172.17.0.3",
        "ClientIPHeader": "",
        "TLSHeader": "",
        "TLSHeaderValue": "",
        "GZIPContentTypes": null
    },
    "Registry": {
        "Backend": "consul",
        "Static": {
            "Routes": ""
        },
        "File": {
            "Path": ""
        },
        "Consul": {
            "Addr": "localhost:8500",
            "Scheme": "http",
            "Token": "",
            "KVPath": "/fabio/config",
            "TagPrefix": "urlprefix-",
            "Register": true,
            "ServiceAddr": ":9998",
            "ServiceName": "fabio",
            "ServiceTags": null,
            "ServiceStatus": [
                "passing"
            ],
            "CheckInterval": 1000000000,
            "CheckTimeout": 3000000000
        }
    },
    "Listen": [
        {
            "Addr": ":9999",
            "Proto": "http",
            "ReadTimeout": 0,
            "WriteTimeout": 0,
            "CertSource": {
                "Name": "",
                "Type": "",
                "CertPath": "",
                "KeyPath": "",
                "ClientCAPath": "",
                "CAUpgradeCN": "",
                "Refresh": 0,
                "Header": null
            },
            "StrictMatch": false
        }
    ],
    "Metrics": {
        "Target": "",
        "Prefix": "{{clean .Hostname}}.{{clean .Exec}}",
        "Names": "{{clean .Service}}.{{clean .Host}}.{{clean .Path}}.{{clean .TargetURL.Host}}",
        "Interval": 30000000000,
        "GraphiteAddr": "",
        "StatsDAddr": "",
        "Circonus": {
            "APIKey": "",
            "APIApp": "fabio",
            "APIURL": "",
            "CheckID": "",
            "BrokerID": ""
        }
    },
    "UI": {
        "Addr": ":9998",
        "Color": "light-green",
        "Title": ""
    },
    "Runtime": {
        "GOGC": 800,
        "GOMAXPROCS": 8
    }
}
2017/02/01 09:08:25 [INFO] Version 1.3.7 starting
2017/02/01 09:08:25 [INFO] Go runtime is go1.7.4
2017/02/01 09:08:25 [INFO] Metrics disabled
2017/02/01 09:08:25 [INFO] Setting GOGC=800
2017/02/01 09:08:25 [INFO] Setting GOMAXPROCS=8
2017/02/01 09:08:25 [FATAL] Error initializing backend. Get http://localhost:8500/v1/agent/self: dial tcp [::1]:8500: getsockopt: connection refused

**docker run -d -p 9999:9999 -p 9998:9998 --link consul magiconair/fabio**
trying to link to the consul container shows

[INFO] Runtime config
{
    "Proxy": {
        "Strategy": "rnd",
        "Matcher": "prefix",
        "NoRouteStatus": 404,
        "MaxConn": 10000,
        "ShutdownWait": 0,
        "DialTimeout": 30000000000,
        "ResponseHeaderTimeout": 0,
        "KeepAliveTimeout": 0,
        "FlushInterval": 1000000000,
        "LocalIP": "172.17.0.3",
        "ClientIPHeader": "",
        "TLSHeader": "",
        "TLSHeaderValue": "",
        "GZIPContentTypes": null
    },
    "Registry": {
        "Backend": "consul",
        "Static": {
            "Routes": ""
        },
        "File": {
            "Path": ""
        },
        "Consul": {
            "Addr": "localhost:8500",
            "Scheme": "http",
            "Token": "",
            "KVPath": "/fabio/config",
            "TagPrefix": "urlprefix-",
            "Register": true,
            "ServiceAddr": ":9998",
            "ServiceName": "fabio",
            "ServiceTags": null,
            "ServiceStatus": [
                "passing"
            ],
            "CheckInterval": 1000000000,
            "CheckTimeout": 3000000000
        }
    },
    "Listen": [
        {
            "Addr": ":9999",
            "Proto": "http",
            "ReadTimeout": 0,
            "WriteTimeout": 0,
            "CertSource": {
                "Name": "",
                "Type": "",
                "CertPath": "",
                "KeyPath": "",
                "ClientCAPath": "",
                "CAUpgradeCN": "",
                "Refresh": 0,
                "Header": null
            },
            "StrictMatch": false
        }
    ],
    "Metrics": {
        "Target": "",
        "Prefix": "{{clean .Hostname}}.{{clean .Exec}}",
        "Names": "{{clean .Service}}.{{clean .Host}}.{{clean .Path}}.{{clean .TargetURL.Host}}",
        "Interval": 30000000000,
        "GraphiteAddr": "",
        "StatsDAddr": "",
        "Circonus": {
            "APIKey": "",
            "APIApp": "fabio",
            "APIURL": "",
            "CheckID": "",
            "BrokerID": ""
        }
    },
    "UI": {
        "Addr": ":9998",
        "Color": "light-green",
        "Title": ""
    },
    "Runtime": {
        "GOGC": 800,
        "GOMAXPROCS": 8
    }
}
2017/02/01 08:49:30 [INFO] Version 1.3.7 starting
2017/02/01 08:49:30 [INFO] Go runtime is go1.7.4
2017/02/01 08:49:30 [INFO] Metrics disabled
2017/02/01 08:49:30 [INFO] Setting GOGC=800
2017/02/01 08:49:30 [INFO] Setting GOMAXPROCS=8
2017/02/01 08:49:30 [FATAL] Error initializing backend. Get http://localhost:8500/v1/agent/self: dial tcp [::1]:8500: getsockopt: connection refused

**docker run -d -p 9999:9999 -p 9998:9998 -p 8500:8500 --link consul magiconair/fabio**
trying to make 8500 available via consul<>host<>fabio gives no docker logs but shows
docker: Error response from daemon: driver failed programming external connectivity on endpoint flamboyant_leavitt (f85bd085108754f63ccadb448a00dd11fbcd131f132c324b0367429d959be01b): Bind for 0.0.0.0:8500 failed: port is already allocated.

Bin On Host Approach
I need a little time to test this.

[magiconair]

@digiman999 According to this document docker container linking is deprecated:

https://docs.docker.com/engine/userguide/networking/default_network/dockerlinks/

[magiconair]

I'm no docker expert but this sequence of commands starts up fabio with consul in a Docker container. Maybe someone with more experience can comment on this:

docker pull consul
docker pull magiconair/fabio
docker run -d --name=consul -e 'CONSUL_BIND_INTERFACE=eth0' consul
docker logs consul # to get the ip address, in my case 172.17.0.2
docker run -d --name=fabio --link consul -e 'registry_consul_addr=172.17.0.2:8500' magiconair/fabio

I think the default bridge networking bridges the two eth0 interfaces between the containers but that doesn't (shouldn't) work for the lo0 interface. So the way I understand this is that 127.0.0.1 in the consul container is different from 127.0.0.1 in the fabio container since these two interfaces aren't bridged. But again, take all this with a huge grain of salt since I've just skimmed over the Docker networking documentation and augmented this with some assumptions on how networks can/should work.

[raben2]

The Containers have to be within the same docker network.
Here is a docker compose example using the host network https://github.com/raben2/0conf-routing-demo/blob/master/docker-compose.yaml

alternatively you can create a own network for the container stack which allows you to communicate via container name and port.

[magiconair]

Since there is no more feedback I'll close this one for now. Please comment if there is something to add and I'll re-open if necessary.

[sprutner]

Thanks for this, the environment variable is what really helped me here. I am going to submit a change to the readme.MD with req commands to run docker container.

[nir0s]

Um.. you can just run

docker run -p 9999:9999 -p 9998:9998 --net host fabiolb/fabio and it will use the host's network, where the consul port should be available.

Of course, this will work assuming that you don't provision fabio instances dynamically.

[sprutner]

Thanks nir0s. I solved that problem many months ago. We are running this in Nomad so docker run is not really relevant...thanks.

[nir0s]

Glad to hear. Actually wrote it for future reference..