[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]

Re: accessing mysql from other pods

That all makes sense. However I'm seeing a bit of weird behaviour that I'd like to share:

Here's from my couchdb container terminal (the only one that has the 'ping' utility installed):

# ping mysql                                                                    
PING mysql.test-demo.svc.cluster.local ( 56 data bytes           
--- mysql.test-demo.svc.cluster.local ping statistics ---                      
5 packets transmitted, 0 packets received, 100% packet loss                     
# ping mysql-test-demo.apps.example.world                                      
PING mysql-test-demo.apps.example.world ( 56 data bytes       
64 bytes from icmp_seq=0 ttl=64 time=0.113 ms                  
64 bytes from icmp_seq=1 ttl=64 time=0.120 ms                  
--- mysql-test-demo.apps.example.world ping statistics ---                   
2 packets transmitted, 2 packets received, 0% packet loss                       
round-trip min/avg/max/stddev = 0.113/0.116/0.120/0.000 ms 

i.e. if I ping mysql (the name of my db service), it looks like some dns service will expand that to the full mysql.test-demo.svc.cluster.local  URL but that address won't be reached. The dns-mapped address, however, does work as expected (ping succeeds)... What's probably wrong with my setup? How can I start to debug it?



> On 15 Feb 2016, at 20:02, Clayton Coleman <ccoleman redhat com> wrote:
> App means whatever you want it to mean.  Project is a container for
> your stuff, app could be a single micro service, a two tier web app, a
> hundred services and DCs, etc.
> Everything in a project should be able to reach each other - however,
> app code still needs to do something to "reach" the others.  That's
> what the local DNS provides (each service is accessible via it's name
> in each container, i.e. a service "db" is visible via "dig db" inside
> of the container) and you can hit any of the ports you want.
> On Mon, Feb 15, 2016 at 1:51 PM, Candide Kemmler
> <candide intrinsic world> wrote:
>> Allright will do, thanks! One thing strikes me is that I have created
>> deployment/build configs, services, persistent volume (claims) etc all
>> separately in a project and hoped that all these objects would happily talk
>> to each other. This examples starts with an `oc new-app` command that
>> bundles all the pieces together. Could that be the thing I missed.
>> Obviously, I'm not all clear on what an "app" means vs a "project"...
>> On 15 Feb 2016, at 18:08, Ben Parees <bparees redhat com> wrote:
>> Take a look at this sample ruby app which defines a mysql service and makes
>> use of it (no route, just a service):
>> https://github.com/openshift/ruby-hello-world
>> the template to deploy it is here:
>> https://github.com/openshift/origin/blob/master/examples/sample-app/application-template-stibuild.json
>> On Mon, Feb 15, 2016 at 12:04 PM, Candide Kemmler <candide intrinsic world>
>> wrote:
>>> I deployed a mysql service with the provided cartridge. It works and I can
>>> connect to it  using the Terminal on the pod itself. However, it seems to be
>>> inaccessible from other pods. I see that there is no route defined for it;
>>> however I don't want to expose it to the outside world, only inside my
>>> project.
>>> Also, AFAIK, mysql has its own settings on how it wants to allow outside
>>> connections to it and I don't know what the defaults are...
>>> I have the same problems with a couchdb pod that I deployed in the same
>>> project: perfectly running inside its own container but invisible from the
>>> outside.
>>> Also, this documentation seems to indicate that there is a .cluster.local
>>> domain available from within the cluster, but all attempts to ping my
>>> services using the provided schemes are failing.
>>> This means I am only able to contact my services using my
>>> custom-configured wildcard domain (*.apps.example.com) but outside of it,
>>> nothing is working like I would expect.
>>> _______________________________________________
>>> users mailing list
>>> users lists openshift redhat com
>>> http://lists.openshift.redhat.com/openshiftmm/listinfo/users
>> --
>> Ben Parees | OpenShift
>> _______________________________________________
>> users mailing list
>> users lists openshift redhat com
>> http://lists.openshift.redhat.com/openshiftmm/listinfo/users

[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]