10.9. Communicating between two containers in a pod


All containers in the same pod share the IP addresses, MAC addresses and port mappings. You can communicate between containers in the same pod using localhost:port notation.

Prerequisites

  • The container-tools meta-package is installed.

Procedure

  1. Create a pod named web-pod:

    $ podman pod create --name=web-pod
  2. Run the web container named web-container in the pod:

    $ podman container run -d --pod web-pod --name=web-container docker.io/library/httpd
  3. List all pods and containers associated with them:

    $ podman ps --pod
    
    CONTAINER ID  IMAGE                           COMMAND           CREATED        STATUS            PORTS       NAMES               POD ID        PODNAME
    58653cf0cf09  k8s.gcr.io/pause:3.5                              4 minutes ago  Up 3 minutes ago              4e61a300c194-infra  4e61a300c194  web-pod
    b3f4255afdb3  docker.io/library/httpd:latest  httpd-foreground  3 minutes ago  Up 3 minutes ago              web-container  4e61a300c194  web-pod
  4. Run the container in the web-pod based on the docker.io/library/fedora image:

    $ podman container run -it --rm --pod web-pod docker.io/library/fedora curl localhost

    You can see that the container can reach the web-container.

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