How to migrate volumes
Get the path of each volume from Docker
#List all your volumes
docker volume ls
#For each volume
docker volume inspect my_volume
#Then keep the Mountpoint path
"Mountpoint": "/var/lib/docker/volumes/mon_volume/_data"
Recreate your volume in Podman
podman volume create my_volume
# Get the path volume
podman volume inspect mon_volume_podman
# Example
"Mountpoint": "/home/dev/.local/share/containers/storage/volumes/mon_volume_podman/_data"
Then copy your docker volume to the podman volume
#The /. at the end is important, keep it
sudo cp -a /var/lib/docker/volumes/my_volume/_data/. /home/dev/.local/share/containers/storage/volumes/my_volume_podman/_data/
How to migrate images
I recommend to push your image in a registry, but if you want transfert it manually, you can do this :
#List your images
docker images
#Then to export your image
docker save -o my_image.tar my_image:latest
#To import into podman
podman load -i my_image.tar
#Check your image is imported
podman images
How to migrate containers
You can reproduce the command run with podman, nether less you need to transfert the volumes.
You can list all the volumes used with this command
docker inspect my_app | grep Mounts -A 20
You can also create a snapshot, a image from you container, like this
docker commit my_app my_app_image
docker save -o my_app_image.tar my_app_image
Remove Docker
sudo apt purge docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
sudo rm -rf /var/lib/docker
Create an alias Docker for Podman
echo "alias docker=podman" >> ~/.bashrc
source ~/.bashrc