How to fix devmapper: Thin Pool has 0 free data blocks in Docker

# Try stopping all containers (may hang if daemon is unresponsive)
docker stop $(docker ps -q) 2>/dev/null || true

# Check if Docker is responding at all
timeout 10 docker info

# Kill the Docker daemon (last resort)
sudo systemctl kill -s SIGKILL docker

# View all logical volumes
sudo lvs -a

# Get detailed thin pool status
sudo lvs -a -o +devices,lv_health_status

# Check volume group free space
sudo vgs

LV         VG     Attr       LSize   Pool Origin Data%  Meta%
docker-pool docker twi-a-t--- 100.00g             100.00 50.00

# Run fstrim on all running containers
sudo sh -c "docker ps -q | xargs docker inspect --format='{{ .State.Pid }}' | xargs -IZ fstrim /proc/Z/root/" 2>/dev/null

# Find exact thin pool name
sudo lvs -a | grep -i pool

# Extend thin pool data volume (adjust path to match your setup)
sudo lvextend -l+100%FREE docker/thinpool

# Or extend by a specific size
sudo lvextend -L+50G docker/thinpool

# Restart Docker to recognize new space
sudo systemctl restart docker

# Verify space is available
docker info | grep "Data Space"

# Create physical volume on new disk (DESTROYS ALL DATA on disk)
sudo pvcreate /dev/sdX

# Add to the docker volume group
sudo vgextend docker /dev/sdX

# Now extend the thin pool
sudo lvextend -l+100%FREE docker/thinpool

# Restart Docker
sudo systemctl restart docker

# Stop Docker (force if necessary)
sudo systemctl stop docker || sudo systemctl kill docker

# Back up important volumes if accessible
sudo cp -r /var/lib/docker/volumes/important_volume /backup/

# Remove Docker data directory
sudo rm -rf /var/lib/docker

# Restart Docker (will recreate directory structure)
sudo systemctl start docker

# Verify clean state
docker info

# Remove all stopped containers
docker container prune -f

# Remove all unused images (including tagged ones)
docker image prune -a -f

# Remove all unused volumes (careful - may delete data!)
docker volume prune -f

# Remove all unused networks
docker network prune -f

# Nuclear option: remove everything unused
docker system prune -a --volumes -f

docker system df
docker info | grep "Data Space"

# Create or edit LVM profile
sudo vi /etc/lvm/profile/docker-thinpool.profile

activation {
  thin_pool_autoextend_threshold=70
  thin_pool_autoextend_percent=20
}

# Find your thin pool logical volume path
sudo lvs -a | grep pool

# Apply profile (adjust path as needed)
sudo lvchange --metadataprofile docker-thinpool docker/thinpool

# Stop Docker
sudo systemctl stop docker

# Back up Docker directory (optional but recommended)
sudo cp -au /var/lib/docker /var/lib/docker.backup

# Remove Docker data
sudo rm -rf /var/lib/docker

# Configure overlay2
sudo vi /etc/docker/daemon.json

{
  "storage-driver": "overlay2"
}

sudo systemctl start docker
docker info | grep "Storage Driver"