How to fix Error response from daemon: Get https://myregistry:5000/v2/: dial tcp: connect: connection refused in Docker

# List running containers
docker ps | grep registry

# Check all containers (including stopped)
docker ps -a | grep registry

docker logs registry

# If stopped
docker start registry

# If not created, start a basic local registry
docker run -d --restart=always -p 5000:5000 --name registry registry:2

docker port registry
# Should show: 5000/tcp -> 0.0.0.0:5000

# Linux
ss -tlnp | grep 5000
netstat -tlnp | grep 5000

# macOS
lsof -i :5000

# Windows
netstat -ano | findstr 5000

# Check if registry responds
curl -v http://localhost:5000/v2/

# Expected response: {"repositories":[]} or similar

docker rm -f registry
docker run -d --restart=always -p 5000:5000 --name registry registry:2

# Use localhost
docker tag myimage localhost:5000/myimage
docker push localhost:5000/myimage

# Use the registry container name or Docker network hostname
docker tag myimage registry:5000/myimage
docker push registry:5000/myimage

# Or use host.docker.internal (Docker Desktop)
docker tag myimage host.docker.internal:5000/myimage
docker push host.docker.internal:5000/myimage

services:
  registry:
    image: registry:2
    ports:
      - "5000:5000"

  builder:
    image: docker:latest
    environment:
      # Use service name as hostname
      REGISTRY_HOST: registry:5000
    depends_on:
      - registry

{
  "insecure-registries": ["myregistry:5000", "localhost:5000"]
}

sudo tee /etc/docker/daemon.json << EOF
{
  "insecure-registries": ["myregistry:5000", "localhost:5000"]
}
EOF

sudo systemctl restart docker

docker info | grep -A5 "Insecure Registries"

docker buildx create --name hostbuilder --driver docker-container --driver-opt network=host
docker buildx use hostbuilder
docker buildx build --push -t localhost:5000/myimage .

docker buildx build --push -t host.docker.internal:5000/myimage .

# Create network
docker network create buildnet

# Start registry on network
docker run -d --name registry --network buildnet -p 5000:5000 registry:2

# Create buildx builder on same network
docker buildx create --name netbuilder --driver docker-container --driver-opt network=buildnet
docker buildx use netbuilder

# Push using registry container name
docker buildx build --push -t registry:5000/myimage .

services:
  - name: registry:2
    alias: registry

variables:
  REGISTRY_HOST: registry:5000

build:
  script:
    # Wait for registry to be ready
    - |
      echo "Waiting for registry..."
      timeout 30 sh -c 'until curl -sf http://registry:5000/v2/; do sleep 1; done'
      echo "Registry is ready!"

    - docker build -t $REGISTRY_HOST/myimage .
    - docker push $REGISTRY_HOST/myimage

services:
  registry:
    image: registry:2
    ports:
      - 5000:5000

steps:
  - name: Wait for registry
    run: |
      timeout 30 sh -c 'until curl -sf http://localhost:5000/v2/; do sleep 1; done'

  - name: Build and push
    run: |
      docker build -t localhost:5000/myimage .
      docker push localhost:5000/myimage

# Check status
sudo ufw status

# Allow port 5000
sudo ufw allow 5000/tcp

# Check ports
sudo firewall-cmd --list-ports

# Allow port 5000
sudo firewall-cmd --permanent --add-port=5000/tcp
sudo firewall-cmd --reload

# List networks
docker network ls

# Inspect network
docker network inspect bridge

# Test connectivity from a container
docker run --rm curlimages/curl curl -v http://host.docker.internal:5000/v2/

# Check if port is allowed
Get-NetFirewallRule | Where-Object {$_.LocalPort -eq 5000}

# Add rule
New-NetFirewallRule -DisplayName "Docker Registry" -Direction Inbound -LocalPort 5000 -Protocol TCP -Action Allow

docker logs registry --tail 100
docker logs registry -f  # Follow logs

# Check disk space in registry
docker exec registry df -h /var/lib/registry

# If full, prune old images (WARNING: removes unused images)
docker exec registry bin/registry garbage-collect /etc/docker/registry/config.yml

# Check registry config
docker exec registry cat /etc/docker/registry/config.yml

# Start with verbose logging
docker run -d -p 5000:5000 --name registry \
  -e REGISTRY_LOG_LEVEL=debug \
  registry:2

# Check container stats
docker stats registry --no-stream

# Restart with memory limit
docker run -d -p 5000:5000 --name registry \
  --memory=512m \
  registry:2