Container ip

2 snippets in Docker

DKDocker

Bridge Network (Default)

syntax

docker run <image>
# Container joins the default bridge network

example

docker run -d --name web nginx:alpine
docker run -d --name api myapp:1.0
# These are on the default bridge but cannot resolve each other by name

Note The default bridge network assigns each container an IP, but DNS resolution by container name does NOT work. You must use IP addresses or create a custom bridge network for name-based communication.

Inspect Container Details

DK · Debugging

syntax

docker inspect <container>

example

docker inspect web-api
docker inspect web-api --format '{{.NetworkSettings.IPAddress}}'
docker inspect web-api --format '{{json .State}}'

output

172.17.0.3

Note Returns comprehensive JSON with networking, mounts, environment, state, and configuration. The --format flag with Go templates extracts exactly what you need without piping through jq.