Podman, Docker commands

Table of Contents

Here are some commands to setup and use Podman

Docker

Installing Docker

sudo apt install podman-docker


## View all the images:
docker images


## View running containers/pod:

#docker ps
#docker ps -a


## Run a constainer:

docker run container_name


## Downloading images:

docker pull image_name (alpine)


## Run command in a container:

docker container run alpine command (echo hello)

Checking os details:

cat /etc/os-release

All the way I was looking for this only(I think)

So docker was there already, but Redhat created the alternative to it called Podman. It is more featured docker.

Build on top of Podman there is this tool called Toolbox.

Installing Toolbox

sudo apt install podman-toolbox

Use toolbox:

toolbox

create    Create a new toolbox container
enter     Enter an existing toolbox container
list      List all existing toolbox containers and images

Toolbox Installation

  1. Create a toolbox - in this case I’m using a custom image as base

    $ toolbox create -i docker.io/akdev1l/ubuntu-toolbox:22.04 
Created container: ubuntu-toolbox-22.04
Enter with: toolbox enter ubuntu-toolbox-22.04

toolbox create -i  docker.io/akdev1l/ubuntu-toolbox:22.04 image_name

  1. Enter the toolbox and do modifications

    $ toolbox enter ubuntu-toolbox-22.04
⬢$ sudo apt install -y neofetch

  2. commit the changes:

    $ podman commit ubuntu-toolbox-22.04 my-custom-image

  3. You can now create new custom toolboxes by doing:

    $ toolbox create -i my-custom-image

View all images in Podman:

podman images

Delete in toolbox:

# Delete container 
toolbox rm container_id

# Delete image
toolbox rmi image_id

# Gives running pod's status
$>podman ps


# Lists all containers and images
$>toolbox list
  1. Start by creating a container
    1. Container is created by an image
    2. Choose a image (alpine)
# Toolbox will be created by your custom_name
toolbox create --image quay.io/toolbx-images/alpine-toolbox:3.17 your_custom_name

-i for image which is alpine

toolbox list


CONTAINER ID  CONTAINER NAME        CREATED         STATUS      IMAGE NAME
e1912fd59a57  alpine-toolbox-3.17   4 minutes ago   running     quay.io/toolbx-images/alpine-toolbox:3.17

Now you have a container named alpine-toolbox-3.17

  1. Enter the container!
toolbox enter alpine-toolbox-3.17

  1. Install desired libraries or applications

  2. Commit the changes to the container

podman commit container_name new_name

No output in podman seach item:

sudo nano /etc/containers/registries.conf

unqualified-search-registries=["registry.access.redhat.com", "registry.fedoraproject.org", "docker.io"]

Creating a backup

podman container stop container_name


# Commit and create a image of your container
podman container commit -p container_id backup_image_name

# Check it
toolbox list

# Create/export the image
podman save -o image_name.tar backup_image_name

# You can clean up if you want to
podman rmi ---

toolbox rm ---

Creating an image

podman commit container_name image_name

Restoring a backup

# Loading the file to podman
podman load -i image.tar

# Check it
toolbox list

# toolbox create --container new_container_name --image_name

# Check again

# Enter to the container
toolbox enter --container container_name

Online post

Error: Image used by seems to be invisible container

 podman rmi localhost/unbuntoo_b 
Error: Image used by 1d8bdeaa0192e9dd2d87fa08cc8cb92c2bac2195868537dec20eb48b5db0b475: image is in use by a container

podman rm --force 1d8bdeaa0192e

# then try
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