Introduction:

Podman, Skopeo, and Buildah have emerged as lightweight alternatives to Docker, offering improved security, lower resource requirements, and native integration with systemd. This guide provides an overview of Podman and demonstrates how to manage and configure containers using Podman commands.

Installing Podman: To install Podman, follow these steps:

# Install Podman
sudo dnf install podman

# Configure container registries
sudo vi /etc/containers/registries.conf

# Disable Docker CLI emulation message
sudo touch /etc/containers/nodocker

Podman Commands Overview: Podman offers a rich set of commands for managing containers. Here is an overview of commonly used Podman commands:

Command	Description
attach	Attach to a running container
build	Build an image using Containerfile instructions
commit	Create a new image from a changed container
create	Create, but do not start, a container
diff	Inspect changes on a container's filesystem
exec	Run a process in a running container
export	Export a container's filesystem contents as a tar archive
help (or h)	Show a list of commands or help for one command
history	Show history of a specified image
images	List images in local storage
import	Import a tarball to create a filesystem image
info	Display system information
inspect	Display the configuration of a container or image
kill	Send a specific signal to one or more running containers
load	Load an image from an archive
login	Login to a container registry
logout	Logout of a container registry
logs	Fetch the logs of a container
mount	Mount a working container’s root filesystem
pause	Pauses all the processes in one or more containers
ps	List containers
port	List port mappings or a specific mapping for the container
pull	Pull an image from a registry
push	Push an image to a specified destination
restart	Restart one or more containers
rm	Remove one or more containers from the host
rmi	Removes one or more images from local storage
run	Run a command in a new container
save	Save an image to an archive
search	Search registry for an image
start	Start one or more containers
stats	Display resource usage statistics for one or more containers
stop	Stop one or more containers
tag	Add an additional name to a local image
top	Display the running processes of a container
umount (or unmount)	Unmount a working container’s root filesystem
unpause	Unpause the processes in one or more containers
version	Display Podman version information
wait	Block on one or more containers

Understanding Docker Commands: docker run vs docker start

Docker is a widely used platform for developing, shipping, and running applications inside containers. Two essential commands in Docker are docker run and docker start. While both commands are used to manage containers, they serve different purposes. This guide provides an overview of these commands and demonstrates their usage.

Installing Docker: To install Docker, follow these steps:

# Install Docker
sudo dnf install docker

# Configure container registries
sudo vi /etc/containers/registries.conf

# Disable Docker CLI emulation message
sudo touch /etc/containers/nodocker

Using Docker Commands:

Search and Pull Images:
- Search for an image:
```
  docker search nginx
```
- Pull an image from the registry:
```
  docker pull docker.io/library/nginx
```
Viewing and Managing Images:
- View images in the local storage:
```
  docker images
```
- Delete an image:
```
  docker rmi nginx
```
Creating and Managing Containers:
- Create and start a new container:
```
  docker run -d nginx
```
- List running containers:
```
  docker ps
```
  or
```
  docker container list
```
- Stop a container:
```
  docker stop nginx
```
- View all containers (including stopped ones):
```
  docker ps --all
```
- Delete a container:
```
  docker rm --force nginx
```
Connecting to Containers:
- Connect to a container and give it a specific name:
```
  docker run -d -p 8080:80 --name mywebserver nginx
```

Conclusion:

Podman, Skopeo, and Buildah offer a lightweight and secure alternative to Docker for managing containers. With features such as rootless mode, native systemd integration, and reduced resource requirements, Podman is well-suited for containerized environments. By mastering Podman commands, users can efficiently build, manage, and deploy containers while benefiting from enhanced security and flexibility.

In summary, docker run is used to create and start a new container based on an image, while docker start is used to start a pre-existing container that has been stopped. By understanding the differences between these commands and their respective use cases, Docker users can effectively manage containers and streamline their development and deployment processes.