docker / container-ip

docker get container IP address

Quick Answer

# Get a container's IP on the default bridge
docker inspect -f '{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' my-container

# Shorter alias
docker inspect my-container | grep -i ipaddress

Usage

You need to know the IP address of a container for debugging or direct connection.

Other causes & fixes

IP on a specific named network

# Replace "my-net" with your network name
docker inspect -f '{{(index .NetworkSettings.Networks "my-net").IPAddress}}' my-container

List all IPs for all running containers

docker inspect $(docker ps -q) --format '{{.Name}}: {{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}'

Get IP from inside the container

docker exec my-container hostname -i
# or
docker exec my-container ip addr show eth0

Prefer container names over IPs

On user-defined networks, containers resolve each other by name — more reliable than IP.

# Use the service/container name in connection strings
DATABASE_URL=postgres://db:5432/mydb   # "db" is the container name

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