How to fix error during connect: Post http://%2Fvar%2Frun%2Fdocker.sock: read unix: connection reset by peer in Docker

# Check daemon status
sudo systemctl status docker

# Or on systems without systemd
sudo service docker status

sudo systemctl start docker

# View recent Docker daemon logs
sudo journalctl -u docker --since "10 minutes ago"

# Or check the log file directly
sudo tail -100 /var/log/docker.log

# Check disk usage on the Docker directory
df -h /var/lib/docker

# Check Docker's disk usage
docker system df

# Remove unused containers, networks, images, and build cache
docker system prune -a

# Also remove unused volumes (be careful - this deletes data)
docker system prune -a --volumes

# Check current memory usage
free -h

# Check if Docker was OOM killed
dmesg | grep -i "killed process" | grep -i docker

# Stop and start Docker
sudo systemctl restart docker

# Verify it's running
sudo systemctl status docker

docker ps
docker info

# Check socket exists
ls -la /var/run/docker.sock

# Should show: srw-rw---- 1 root docker

# Restart Docker to recreate the socket
sudo systemctl restart docker

# Ensure your user is in the docker group
sudo usermod -aG docker $USER
# Log out and back in for group changes to take effect

# Check current limits
ulimit -a

# Edit Docker service limits
sudo systemctl edit docker

[Service]
LimitNOFILE=1048576
LimitNPROC=infinity
LimitCORE=infinity

sudo systemctl daemon-reload
sudo systemctl restart docker

# Stop Docker
sudo systemctl stop docker

# Back up any important data first!

# Remove Docker's state (WARNING: deletes all containers, images, volumes)
sudo rm -rf /var/lib/docker

# Restart Docker
sudo systemctl start docker