Podman

Podman is a drop-in replacement for Docker, at least that's what I hear.

From the little experience I currently have, the commands on the command line seem to be almost equivalent if not in syntax at least in intention to Docker.

Installing Podman

mrbear % brew install podman

Running Podman

podman machine init
Downloading VM image: fedora-coreos-38.20230514.2.0-qemu.aarch64.qcow2.xz: done
Extracting compressed file
Image resized.
Machine init complete
To start your machine run:

podman machine start

podman machine start
Starting machine "podman-machine-default"
Waiting for VM ...
Mounting volume... /Users:/Users
Mounting volume... /private:/private
Mounting volume... /var/folders:/var/folders

This machine is currently configured in rootless mode. If your containers
require root permissions (e.g. ports < 1024), or if you run into compatibility
issues with non-podman clients, you can switch using the following command:

podman machine set --rootful

API forwarding listening on: /Users/mrbear/.local/share/containers/podman/machine/qemu/podman.sock

The system helper service is not installed; the default Docker API socket
address can't be used by podman. If you would like to install it run the
following commands:

sudo /opt/homebrew/Cellar/podman/4.5.0/bin/podman-mac-helper install
podman machine stop; podman machine start

You can still connect Docker API clients by setting DOCKER_HOST using the
following command in your terminal session:

export DOCKER_HOST='unix:///Users/mrbear/.local/share/containers/podman/machine/qemu/podman.sock'

Machine "podman-machine-default" started successfully

Verify Podman

podman info

A GUI

I will be trying out Podman Desktop. Under Docker I was very used to Portainer.

Networking

Non-root containers use slirp4netns and have no routable IP address. Root containers use netavark.

Glossary of commands

podman machine init

initializes the machine

podman machine start

starts the machine

podman info

verify installation

podman ps [-a]

list creating and running containers

podman pull <container url>

pull an image, for example "podman pull docker.io/library/postgres:14" or simply "podman pull mariadb"

podman images

show all images

podman rmi <image>

remove an image, for example "podman rmi 0c1418f4071b", where the id can be ascertained using "podman images"

podman run ...

run a container, for example:

• podman run --detach --tty --name webserver --publish 8080:80 quay.io/libpod/banner
• podman run --name postgres --detach --publish 5432:5432 --env POSTGRES_USER=admin --env POSTGRES_PASSWORD=Passw0rd postgis/postgis
• podman run --name postgres --detach --publish 5432:5432 --env POSTGRES_USER=admin --env POSTGRES_PASSWORD=Passw0rd docker.io/library/postgres:latest
• podman run --detach --name mariadb --publish 3306:3306 --env MARIADB_USER=root --env MARIADB_PASSWORD=Passw0rd --env MARIADB_ROOT_PASSWORD=Passw0rd docker.io/library/mariadb

--detach/-d

run the container in the background and print the new container ID. The default is false.

--tty/-t

Allocate a pseudo-TTY. The default is false.

--publish/-p [[ip:][hostPort]:]containerPort[/protocol]¶

Publish a container’s port, or range of ports, to the host.

--env/-e

Set environment variables.

--name

Assign a name to the container.

podman ps

lists the running containers on the system. Use the --all flag to view all the containers information.

podman attach <container_id>

sttached tty to a running container

podman inspect -l

metadata and details about the running containers

podman logs <container_id>

log container logs

podman top <container_id>

show processes running in the container

podman start <container_id>

start a container

podman stop <container_id>

stop a container

podman rm <container_id>

remove a container

I'll add to this as I get more information.

References

Podman

https://podman.io/

Podman - Installation

https://podman.io/docs/installation

TechViewLeo - How To Run PostgreSQL 14|13 in Podman Container

https://techviewleo.com/how-to-run-postgresql-in-podman-container/?utm_content=cmp-true

podman desktop

https://podman-desktop.io/

ImaginaryCloud - Podman vs Docker: What are the differences?

https://www.imaginarycloud.com/blog/podman-vs-docker/

Portainer

https://www.portainer.io/