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To switch the Docker storage engine from devicemapper to overlay2, follow these steps:

1. Stop the Docker daemon:

sudo systemctl stop docker

1. Check the current storage driver by running the following command:

docker info | grep "Storage Driver"

1. If the output shows "devicemapper," backup any existing Docker data by moving it to a new directory:

sudo mv /var/lib/docker /var/lib/docker.bak

1. Install the packages required for overlay2:

sudo apt-get update
sudo apt-get install linux-image-extra-$(uname -r) linux-image-extra-virtual
sudo apt-get install docker-ce

1. Edit the Docker daemon configuration file:

sudo vim /etc/docker/daemon.json

1. Add the following lines to the file:

{
  "storage-driver": "overlay2"
}

1. Save and close the file.

2. Start the Docker daemon:

sudo systemctl start docker

1. Verify that the storage driver has been changed to overlay2:

docker info | grep "Storage Driver"

The output should show "overlay2."