Linux Survival Basics
Read-onlyInspect Docker Restart Policy
You need restart policy, exit code, and current state error for one container.
Command
docker inspect -f '{{.HostConfig.RestartPolicy.Name}} {{.State.ExitCode}} {{.State.Error}}' container_nameBefore you run this
System impact: Read-only. Low when scoped to the shown target.
When not to use it: Do not disable restart policies before proving the application failure.
Expected output
Restart policy name, exit code, and state error text.
System impact
Read-only. Nothing changes. The command reads current state and prints diagnostic evidence.
Recovery / rollback: no state is changed.
When to use it
Use when restart behavior is unclear.
When not to use it
Do not disable restart policies before proving the application failure.
Common misread
Do not disable restart policies before proving the application failure.
Example run
Commands shown
These are the commands shown for inspection. Treat them as an example, not proof that your system will behave identically.
docker inspect -f '{{.HostConfig.RestartPolicy.Name}} {{.State.ExitCode}} {{.State.Error}}' container_namedocker inspect -f '{{.HostConfig.RestartPolicy.Name}} {{.State.ExitCode}} {{.State.Error}}' container_name
next steps
Related commands
Read Recent Docker Container Logs
Recent container logs usually show the failing command or dependency.
docker logs --tail 80 container_name
List Docker Container Restart Status
Restart loops are visible before rebuilding anything.
docker ps -a --format 'table {{.Names}} {{.Image}} {{.Status}} {{.RestartCount}}'
Read Recent Docker Restart Events
Docker events show restart and die loops over time.
docker events --since 30m --until 0s
Read Current-Boot Logs for One Service
Ignore stale logs and inspect only what happened since this boot.
journalctl -u nginx -b --no-pager -n 80
Spot Foreign-Architecture Packages
One unexpected architecture can explain confusing dependency output.
dpkg-query -W -f='${Architecture}\t${Package}\n' | awk '$1 != "amd64" && $1 != "all"'
next diagnostic step
Where to go from this command
- Related problem hub Use this command as part of the repair path.
Study mapping
Use this as independent command practice: read the notes, predict the output, then compare it with the example before using a real shell.
Independent study support only. No affiliation, endorsement, exam dumps, or real exam questions.