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In this lesson,

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we're going to cover some basic container operations

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that you should be aware of to manage your containers

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and conduct basic container image operations.

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First, let's jump into our container image operations.

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To work with a container image,

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you can use a program like Docker or Podman

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to run a manage containers and container images.

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Now, Podman is a containerization program

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that runs on Red Hat Enterprise Linux,

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and supports just about all the features

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you're going to find in Docker,

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without needing the underlying Docker service

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or an active container engine on your system.

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When it comes to issuing commands,

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the same syntax is used for both Docker and Podman,

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so you can choose which one you prefer to use,

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and the commands that I'm going to cover in this lesson

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are going to work equally well with both of them.

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When you're performing container image operations,

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you need to understand how to do some basic functions,

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things like building, pushing, pulling,

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listing and removing container images.

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To build a container image,

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you're going to issue the command podman build.

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And this will build a container image

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using a Docker file instruction

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that's located in the current directory.

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To push a container image to a specified destination,

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you're going to enter the command podman push.

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This destination could be any container management service

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that you're going to use, such as Docker or Kubernetes.

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To pull a container image from a container registry,

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you're going to enter the command podman pull.

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This registry could be a public or private registry,

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as long as you have the proper access rights

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and network productivity to that given registry.

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To list out the container images available

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on your local system, you can do this

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by entering the command podman images.

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If you want to list out all of the running containers,

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on the other hand, you can enter podman ps -a

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to list out all the running containers on your screen.

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If you want to remove a container image, you can do this

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by entering the command pod man rmi and the image ID.

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This will then remove the container image

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from the current list of containers

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available on your system.

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Now, as a reminder, all the podman commands that I went over

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are just a subset of the long list of commands

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that you can use to work with containers,

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depending on your use case.

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To learn more about Podman,

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you can always check the man pages on your Linux system.

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Also, remember that Podman uses

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the exact same syntax as Docker,

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and so you can easily replace the word podman

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with the word Docker and all these commands

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we just discussed will work inside of Docker, too.

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Next, let's talk about container management

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and how you can perform some basic container operations,

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like starting and stopping containers,

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inspecting containers, listing containers,

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deploying existing images, connecting to containers,

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logging actions inside of containers

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and exposing ports for your containers.

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First, we have the starting and stopping of containers.

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If you want to start a container, simply enter the command

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podman start, and the name of the container image

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that you want to start.

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If you want to stop a container, simply enter podman stop,

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and the name of the container image that you want to stop.

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Second, we have inspecting containers.

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Now, to inspect a container, you simply enter

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podman inspect, and the name of the container image.

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This will then display the configuration

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of a given container or image

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so that you can ensure it's properly set up

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and configured for your particular use case.

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Third, we have listing containers.

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To list out all the containers on your system,

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you can use podman pod list

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and this is going to show the containers,

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their current status, such as running or paused,

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and when they were first created.

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Fourth, we have deploying existing images.

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Now, the best way to deploy an image is to use a template

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in order to give your users a quick and easy way

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to deploy an image with a working configuration.

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A template file is going to be created

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based on the format of the containerization solution

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that you're going to be using, such as OpenShift or Kubernetes.

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And this will include a unique user-friendly name,

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as well as descriptions of the containers

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and the pods that are being used by that image.

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Fifth, we have connecting to containers.

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Now, if you want to connect to a container to interact with it

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you can use the podman attach command

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and then the container's image name.

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This will attach your console

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to a running container based on its name or ID

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and then allow you to view its ongoing output

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or interactively take control of that container.

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Sixth, we have logging actions and containers.

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Now, inside of your containers

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there is logging that's happening by default,

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but you have to get those logs

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from the container to be able to read them.

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To gather the logs from a container,

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you can enter podman logs and the container's name

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to view and collect those logs.

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Seventh, we have exposing ports for your containers.

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Now, if you enter podman port and the container name,

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you're going to see a list of all the port mappings

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for a given container.

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To expose a port on a container,

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you can do this when you initially create that container

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using the podman create command

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and using the --expose=port option

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where the port contains the port number or port numbers

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that you want to expose to redirection by that host system.

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If you want to expose a port on a container

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when you start it up or you run it,

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you can instead enter podman run --expose=port.

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Now, for the exam, you do not have to be an expert

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in conducting container operations,

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but you should understand the basics

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that we covered in this lesson.

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For example, if I asked you how to download

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a container image from a container registry using Podman,

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you should select the answer that contains

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the podman pull command, because this is used

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to pull or download an image from a registry.

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This is the level of depth that you need to have

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in order to answer questions on the exam

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about basic container operations.