On 06/01/2015 03:28 PM, Karanbir Singh wrote:
can we move this conversation to the centos-devel list please.
- KB
On 01/06/15 14:25, Jan Chaloupka wrote:
Hi,
CentOS does not have any equivalent to fedmsg bus [1] at the moment. What is it used for? Services (koji, pkgdb, ...) can send messages about their state and result of tasks they run into the bus to notify other service which can react accordingly. Thus creating a modular infrastructure. E.g. koji send a message about finished build. Agent read the message, trigger a jenkins job and run additional tests on the build. Daily statistics about number of finished /failed builds can be collected. Other application can have their own use cases. Example of bus topology [4]. [5] is another source of some info about fedora infrastructure.
What needs to be done to set up the bus? Basic demo and setup of fedmsg, fedmsg-relay is at [3]. First would be great to setup the bus for koji. Koji runs on CentOS 6. fedpkg package is in epel6 repository [2]. We will be needing fedmsg-hub, fedmsg-relay, koji-hub and koji-plugin parts in the topology at the moment [4]. CentOS koji and Fedora koji are not exacly the same but both APIs are compatible. So maybe take an inspiration from Fedora's koji plugin. In order to set up bus and clients, endpoints has to be set. Setting of endpoints is discussed at [6]. Context of endpoints is described at [3]. Configuration files are shared and must be the same on all machines using the bus. Bus messages can be saved into database [7].
What we can start with?
- create an instance of centos/fedora for fedmsg to run
- create/reuse koji plugin (where it can be found?)
- set/implement koji plugin to send messages for fedmsg
What other application do you have in centos that could use fedmsg?
Once there is a running msg bus, instances set, etc., it will be easier to debug and test.
Ralph, Pierre, what would be the optimal distribution of instances for fedmsg? Is one instance of centos enough? What would be the best first step to set up fedmsg? Where can I found koji-plugin, resp. its implementation?
This question is confusing. I supposed fedmsg is a master and all services are slaves. However, as Pierre-Yves informed me there is no master. fedmsg bus is decentralized and distributed among all services. Thus thus the configuration distributed on each host.
This is only a discussion at the moment. Any other ideas are appreciated. Other issues and problems will arise while configuring the bus and koji.
[1] https://github.com/fedora-infra/fedmsg/ [2] http://koji.fedoraproject.org/koji/buildinfo?buildID=630367 [3] http://fedmsg.readthedocs.org/en/latest/deployment/ [4] http://fedmsg.readthedocs.org/en/latest/topology/ [5] https://fedoraproject.org/wiki/Messaging_SIG [6] http://fedmsg.readthedocs.org/en/latest/config/#term-endpoints [7] http://fedmsg.readthedocs.org/en/latest/deployment/#store-all-messages
Kind Regards Jan
-
Jan Chaloupka