View source for CentOS 8.x working with podman pods

<yambe:breadcrumb self="Working with podman pods">CentOS 8.x podman|podman</yambe:breadcrumb>
=CentOS 8.x working with podman pods=

==Create pod==
Create a new pod with desired name
<pre>
   podman pod create --name pod1
</pre>


==List pods==
List pods of current system
<pre>
   podman pod list
</pre>


==List all containers including containers which are member of pods==
* To list containers including containers of various pods use:
<pre>
     podman ps --all
</pre>
Note that all pods start with a default container named infra

* To list containers including pod ID use:
<pre>
     podman ps --all --pod
</pre>



==Run container inside pod==
To run container inside pod use:
<pre>
     podman run -dt --pod pod1 centos top
</pre>


==Create a pod and container inside pod with port publish string==
To create a pod with exposed port use:
<pre>
   sudo podman pod create -p 8080:80 --name web1
   sudo podman run -dt --pod web1 -p 8080 nginx:latest
</pre>
Note that we need to publish all required ports during pod creation.  The list cannot be changed later.


==Remove pod with all its containers==
To remove pod with all its containers (Stop containers, Remove containers and then remove pod)  use:
<pre>
   podman pod rm -f <pod-id>
</pre>

Refer:
* https://computingforgeeks.com/using-podman-and-libpod-to-run-docker-containers/


==Communication between two containers within same pod==
All containers with same pod share same network namespace.  Hence communication between two containers can be done via 127.0.0.1 IP or localhost itself.
<pre>
   podman pod create --name pod1
   podman run --pod pod1 --name pod1_httpd -dt httpd
   
   #Validate container belonging to pod is not member of host bridge
   podman inspect pod1_httpd | grep -i ip

   podman run --pod pod1 --name pod1_bash -it centos

   #Within container bash do following
   curl http://127.0.0.1/
   #<html><body><h1>It works!</h1></body></html>

   curl http://localhost/
   #<html><body><h1>It works!</h1></body></html>

   cat /etc/hosts
   #127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
   #::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
   #10.88.0.20	pod1
</pre>

Here we can communicate with containers within pod and base host via infra container having IP 10.88.0.20 as listed in /etc/hosts IP.  We can also see the IP by inspecting the pods infra container using commands such as:
<pre>
   podman pod list
   podman inspect 6aac71d95792-infra | grep -i ip
</pre>
where 6aac71d95792 should be replaced with pod ID (not infra ID) of the pod 



<yambe:breadcrumb self="Working with podman pods">CentOS 8.x podman|podman</yambe:breadcrumb>