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Re: [atomic-devel] podman user defined network support

rootless podman containers can create network using slirp4netns
but there is no container to container communication

the workaround I used in podman-compose is that I share a network between containers
and all containers talk via pod shared localhost (not to be confused with host localhost)

I was able to run this complex stack having:

a django web interface
Postgres database

all linked to gather and non-exported to host except the django web interface


the trick is like this

podman pod create -p 8080:80 --name=mypod --share net
podman run --name=db --pod=mypod  ...
podman run --name=web --pod=mypod --add-host db: ...

On Thu, May 16, 2019 at 5:31 PM Farkas Levente <lfarkas lfarkas org> wrote:
On 5/8/19 9:19 PM, Brent Baude wrote:
> On Wed, 2019-05-08 at 09:53 +0200, Farkas Levente wrote:
>> hi,
>> it seems that podman do not support network command. ie. it's not
>> possible to create user defined network.
>> is it possible to create a user defined network somehow?
>> is it possible to define a user defined network is rootless mode?
>> since podman do not support --link how can communicate two container
>> in
>> a podman environment?
>> without this feature is there any other way than --net=host? since
>> currently i can't find any other ways. eg. a db and a service
>> container.
>> thanks in advance.
> In order to specific a specific network, you must create that network
> with CNI.  These network descriptions are defined in /etc/cni/net.d and
> podman ships a default one.  A while back, I created a secondary cni
> network for doing some podman testing. I called the network podman2 and
> the conf file appears as:
> {
>     "cniVersion": "0.3.0",
>     "name": "podman2",
>     "plugins": [
>       {
>         "type": "bridge",
>         "bridge": "cni1",
>         "isGateway": true,
>         "ipMasq": true,
>         "ipam": {
>             "type": "host-local",
>             "subnet": "",
>             "routes": [
>                 { "dst": "" }
>             ]
>         }
>       },
>       {
>         "type": "portmap",
>         "capabilities": {
>           "portMappings": true
>         }
>       }
>     ]
> }
> The CNI project is outside podman and can be found ->
> https://github.com/containers/libpod/blob/master/test/e2e/common_test.go#L267
> you might also want to checkout out their plugins subproject.

ok. but this means currently there is no alternative for docker network.
what's more currently with podman you must use --net=host.
since there is no user defined network (at least with easy command
line), what's more there is no --link option for podman. so neither of
the docker container communication works with podman. is it true?

  Levente                               "Si vis pacem para bellum!"

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