Docker Error3 Fixes Available

Error: Bind for 0.0.0.0:PORT failed — port is already allocated

Error response from daemon: driver failed programming external connectivity: Bind for 0.0.0.0:3000 failed: port is already allocated

What does this error mean?

The port you're trying to bind your Docker container to is already in use by another process on your host machine — either another container or a local process.

Common Causes

Another Docker container is already using the same port
A local process (Node.js, nginx, etc.) is using the port
A previous container wasn't stopped properly and still holds the port
Running docker-compose up twice without stopping the first instance

How to Fix It (3 Solutions)

Find and kill the process using the port

Identify what's using the port and stop it.

Code

# On Linux / Mac — find the process
lsof - i : 3000
# or
sudo ss - tulpn | grep : 3000

# Kill it
kill - 9 <PID>

# On Windows(PowerShell)
netstat - ano | findstr : 3000
taskkill / PID<PID> / F

Stop all running containers

Stop all Docker containers that might be holding the port.

Code

# Stop all running containers
docker stop $(docker ps - q)

# Or stop a specific container
docker ps  # find the container ID
docker stop <container_id>

Use a different port mapping

Map to a different host port in your docker-compose.yml.

Code

# docker - compose.yml
services:
app:
ports:
- "3001:3000"  # host:container — use 3001 instead of 3000

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