Hosting Operations

See Container Network Attachments

Services cannot reach each other and you need to confirm container network membership.

Command

docker inspect --format '{{.Name}} {{range $name, $net := .NetworkSettings.Networks}}{{$name}} {{$net.IPAddress}} {{end}}' api

What changed

Nothing changes. Docker reads container networking metadata.

Danger

safe

When to use it

Use when containers cannot connect by service name, expected networks are missing, or IP assumptions look wrong.

When not to use it

Do not use it as a packet-level diagnosis; follow up with DNS and connectivity checks when needed.

Undo or recovery

No undo needed because this command is read-only.

Expected output

/api app_net 172.18.0.5

demo script

Disposable terminal steps

docker inspect --format '{{.Name}} {{range $name, $net := .NetworkSettings.Networks}}{{$name}} {{$net.IPAddress}} {{end}}' api
docker network ls

Terminal transcript Demo JSON

simulated output

What it looks like

disposable vessel

::fixture-ready::
$ docker inspect --format '{{.Name}} {{range $name, $net := .NetworkSettings.Networks}}{{$name}} {{$net.IPAddress}} {{end}}' api
/api app_net 172.18.0.5 
::exit-code::0
$ docker network ls
NETWORK ID   NAME      DRIVER
n1           bridge    bridge
n2           app_net   bridge
::exit-code::0

YouTube Short

Check Docker networks.

If containers cannot talk, check network membership before changing config.

experiments

A/B tests to run

Metric: average_view_duration

A: A healthy container can still be on the wrong network.

B: Container connectivity starts with network membership.