Thanks that actually got me where i wanted to get to (with a little more
workaround):
If I start a docker container like this
docker run -it --rm dockerfile/mongodb bash -c "HOST_IP=`/sbin/ip route|awk
'/default/ { print $3 }'` mongo --host $HOST_IP:27017"
I get the correct behaviour. I think I should be able to get it going now.
Although maybe exposing the slave host ip inside the container may not be a bad
idea.
-- Ankur
> On 27 Oct 2014, at 00:14, Tim Chen <[email protected]> wrote:
>
> Hi Ankur,
>
> You can't access host via 'localhost' in a docker container since localhost
> (127.0.0.1) is just the loopback that is in the container and not to your
> host.
> However since docker automatically creates the bridge for you that connects
> the container and host, you can access the host by it's ip from the container.
>
> Try the following instead:
> HOST_IP=`hostname -i`
> docker run -it --rm dockerfile/mongodb bash -c "mongo --host $HOST_IP:27017"
>
> Tim
>
> On Sun, Oct 26, 2014 at 11:28 PM, Ankur Chauhan <[email protected]
> <mailto:[email protected]>> wrote:
> Hi Tim,
>
> Thanks for the reply.
>
> Yes these are services that are running on all the nodes. Imagine it like
> this: All slave hosts have a mongos running on 27017, a kafka broker, etc
> always running. I think I just don't know how to access them from within the
> container? My perception is that accessing localhost:27017 from within the
> container doesn't connect to the hosts' localhost:27017. If that is possible,
> how do i do it? I started a mongos on 27017 but when i tried the command
> `docker run -it --rm dockerfile/mongodb bash -c 'mongo --host
> localhost:27017'` it was unable to connect.
>
> -- Ankur
>
>> On 26 Oct 2014, at 21:12, Tim Chen <[email protected]
>> <mailto:[email protected]>> wrote:
>>
>> Hi Ankur,
>>
>> Not sure I understand exactly, are these common services all running on the
>> same host where you're running the container?
>>
>> If it's running the same host, docker container should be able to access any
>> port in the host, if it's cross hosts then you have to setup your own bridge
>> and use the lxc-conf option, or use something like pipework.
>>
>> I'm adding the lxc-conf options into the next release of mesos.
>>
>> Tim
>>
>> On Sun, Oct 26, 2014 at 6:39 PM, Ankur Chauhan <[email protected]
>> <mailto:[email protected]>> wrote:
>> Hi all,
>>
>> So I have been dabbling with docker containers in and mesos. I have the
>> following scenario and i was wondering if someone had experience with
>> something like this.
>>
>> I have a bunch of dockerized apps running and the slave hosts have some
>> common services running, something like mongos and kafka brokers etc. I was
>> wondering if there was a way to expose these services (i.e. some tcp port)
>> to the docker containers?
>>
>> Is this even a legitimate way of exposing services to apps but my main
>> intention is to avoid going over the network or something.
>>
>> -- Ankur
>>
>
>
