[Swift-user] Swift Coaster Service & Docker Containers

Sat Aug 30 08:39:38 CDT 2014

Thanks Mike and Yadu,

Yes it would be great if there is a published config for this use case, and I am willing to help in whatever capacity I can.

The docker containers can reach out to external IP addresses, so as you both mention the best way may be to run the worker.pl in each container and have it connect back to the coaster service. I start the coaster service on a known ip/port host using the command you specify.

I think I conceptually understand how this could work and will try to test something.

I have an ubuntu docker container configured to start ssh services at the command below. It sounds like, however, if I can run the worker.pl on each container and connect to the coaster service, ssh is not even required.

docker run -i -p 22 -t mattshax/precise_ep_node sh -c '/usr/sbin/sshd -D'

On Aug 29, 2014, at 9:33 PM, "Yadu Nand" <yadudoc1729 at gmail.com<mailto:yadudoc1729 at gmail.com>> wrote:

Hi Matthew,

You can use the coaster-service directly with the following arguments :
coaster-service -p $SERVICEPORT -localport $WORKERPORT -nosec -passive &> /var/log/coaster-service.logs

The workers running under docker should be connecting to the WORKERPORT and the swift client would use the SERVICEPORT.
Another thing to remember is to make sure that you use the the coaster-service and worker.pl<http://worker.pl> from the same swift release.

The start-coaster-service command is a wrapper over coaster-service which in addition to starting the coaster service, also
tries to ssh the worker.pl<http://worker.pl> to the WORKER_HOSTS. In the situation that you describe, I think it makes sense to have the workers
just connect back to the coaster-service which is listening on a known IP / port.

Thanks,
Yadu

On Fri, Aug 29, 2014 at 8:34 PM, Michael Wilde <wilde at anl.gov<mailto:wilde at anl.gov>> wrote:
Matthew,

I would treat this case similar to the configuration you'd use for a set of virtual machines.

Start one coaster service for each pool of identical docker containers that you want to run.

For each pool of containers, run a Swift worker (worker.pl<http://worker.pl>) in the container and have it connect back to the coaster service you designate to manage that pool.

I'm assuming that from a docker contained you can connect out to any reachable IP address.

Another approach is to treat the containers like a set of ad-hoc compute nodes, and ssh into them with automatic coasters using the ssh:local jobmanager setting.

We'll try to test and publish a config for such cases. We'd welcome your help with that.

- Mike

On 8/29/14, 7:48 PM, Matthew Shaxted wrote:
Hi All,

I’m trying to find a way to run Swift workflows on multi-host docker containers, and wondering if anybody has had success with this.

When I start a docker container and define specific ports to open on the container, they mapped to random ports on the host machine. So for example, I can start a container with an ssh port open from a host “10.1.1.1”, and can then access this container across hosts with “ssh compute at 10.1.1.1<mailto:compute at 10.1.1.1> –p 49160”.

Now I’m hoping to link these docker containers to Swift’s start-coaster-service. I think it would be possible and relatively easy if I can say, start the coasters on a series of IP addresses AND ports. So a host’s file perhaps would look something like below, and coasters would be started on the correct docker container:

10.1.1.1<http://10.1.1.1>: 49160
10.1.1.2<http://10.1.1.2>: 34155
10.1.1.2<http://10.1.1.2>: 34156   …

Does this make sense? Is it possible to start coasters by specifying an IP address and port number?

Any thoughts are greatly appreciated.

Thanks,
Matthew

MATTHEW SHAXTED
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