How to fix Error starting daemon: error initializing graphdriver: could not locate zfs dataset in Docker

# List all ZFS pools
zpool list

# List all ZFS datasets and their mount points
zfs list

# Check if anything is mounted at /var/lib/docker
df -h /var/lib/docker
mount | grep docker

# Stop Docker service
sudo systemctl stop docker
sudo systemctl stop docker.socket

# Back up existing Docker data if any
if [ -d /var/lib/docker ]; then
  sudo mv /var/lib/docker /var/lib/docker.bak
fi

# Replace 'poolname' with your actual ZFS pool name
# Common pool names: zpool, tank, rpool, zroot

# Create the dataset with mountpoint
sudo zfs create -o mountpoint=/var/lib/docker poolname/docker

# Verify the dataset was created and mounted
zfs list poolname/docker
df -h /var/lib/docker

# Create a pool on a dedicated disk (example: /dev/sdb)
sudo zpool create -f dockerpool /dev/sdb

# Then create the dataset
sudo zfs create -o mountpoint=/var/lib/docker dockerpool/docker

# Create or edit Docker daemon configuration
sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<EOF
{
  "storage-driver": "zfs"
}
EOF

# Check the mountpoint property
zfs get mountpoint poolname/docker

# Ensure canmount is set to on
zfs get canmount poolname/docker

# If canmount is off, enable it
sudo zfs set canmount=on poolname/docker

# Enable ZFS auto-mount service (systemd systems)
sudo systemctl enable zfs-mount
sudo systemctl enable zfs-import-cache
sudo systemctl enable zfs-import.target

# Start Docker service
sudo systemctl start docker

# Check Docker status
sudo systemctl status docker

# Verify storage driver
docker info | grep -E "Storage Driver|Data Space|Metadata Space"

Storage Driver: zfs

# Run the hello-world test image
docker run --rm hello-world

# Pull and run a more substantial image
docker run --rm alpine cat /etc/os-release

# Check that Docker is storing data on ZFS
zfs list | grep docker