You can run the complete day-to-day Docker container workflow from a terminal: list containers, create a named instance, watch its output, inspect its state, execute a process inside it, monitor resources, stop it gracefully, start it again, and remove it when it is no longer needed. The core pattern is docker run to create and start, docker ps to discover, docker logs and docker inspect to understand, docker exec to operate inside, and docker stop/docker rm to finish. Docker must be installed and your account must be able to reach the Docker daemon; on some installations that means prefixing commands with sudo or using an equivalent permission setup.
What you are managing
A Docker container is a running or stopped instance created from an image. Docker gives every container an ID, and you can assign a readable name with --name. The ID and name are interchangeable in most container commands; a name is easier to type and makes scripts and incident notes readable.
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This guide stays at the container-operations level. It does not require a graphical dashboard, and it does not cover building images or designing orchestration systems. The examples use the Docker CLI directly against one daemon. If your installation requires elevated permissions, add sudo to the commands or configure the documented group or policy used by your operating system.
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Start every investigation by seeing what exists.
docker psdocker ps lists containers that are currently running. To include containers that have exited, use:
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docker ps -aThe all-containers view is essential after a failed start: a container can disappear from the default listing simply because its primary process exited. Use the displayed name or ID in subsequent commands. Names are unique on a daemon, so choose a descriptive one when creating a container.
Create and start a named container
docker run creates a container from an image and starts it in one operation. This example starts an NGINX container in the background and publishes its port:
docker run --name web -d -p 8080:80 nginxHere, --name web assigns the handle used later, -d runs detached from the terminal, and -p 8080:80 maps port 8080 on the Docker host to port 80 in the container. The final argument, nginx, is the image reference.
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If a container with the requested name already exists, Docker will not silently replace it. List existing containers with docker ps -a, then decide whether to start that container, remove it after checking its data, or select a different name. If the image’s application exits immediately, detached mode still returns control to your shell; check docker ps -a and then read its logs.
A container has a lifecycle independent of the terminal that launched it. Closing a terminal does not by itself remove a detached container. Its state remains visible until you stop, remove, or otherwise recreate it.
Read application output and configuration
Follow logs for live output
Use logs when you need the application’s standard output and standard error:
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docker logs -f webThe -f option follows new output as it arrives, making it useful while starting a service or reproducing a failure. Stop following with your terminal’s interrupt key; that detaches your log viewer, not the container itself. If the container is not running, its previously captured output can still explain why it exited.
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Inspect Docker’s object data
docker inspect webdocker inspect returns detailed, machine-readable information about the container object: its identity, state, configured command, networking, mounts, and other metadata recorded by Docker. Use it when the symptom is about configuration or state rather than application text. For example, logs may show that a service failed, while inspection can reveal the command Docker attempted to run or whether the container is marked running or stopped.
Because inspection output is extensive, search or format it with tools already available in your shell when you need one field. Keep the unfiltered output for a complete record when diagnosing a deployment or handing an issue to another operator.
Run an additional command inside a running container
docker exec starts a new process in an existing, running container. It does not restart the container’s primary process.
docker exec -it web sh-i keeps standard input open and -t allocates a terminal, so together they provide an interactive session. This command works only when the image contains an executable named sh and the container’s primary process is still running. Minimal images may omit a shell; in that case, execute a diagnostic binary that the image actually includes, or inspect and log the container from the host instead.
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The command supplied to docker exec must be an executable. Docker does not interpret shell operators automatically. To run a pipeline, variable expansion, or a chain such as two commands joined by &&, explicitly invoke a shell:
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docker exec -it web sh -c 'command1 && command2'Use exec for short-lived administration, checking files, or validating a process from the container’s own environment. Changes made inside a container can be lost when that container is replaced, so treat an interactive session as an operational aid rather than a substitute for a reproducible image or external data store.
See processes and live resource consumption
List processes with top
docker top webdocker top shows the processes Docker can see in the container. It is a point-in-time process listing: use it to confirm that the expected server or worker exists, identify a runaway child process, or compare the process tree with what the image is supposed to launch.
Stream usage with stats
docker stats webdocker stats streams live resource measurements for running containers. It is useful for spotting sustained CPU activity, memory pressure, or unusual network and block-I/O behavior while an incident is occurring. It reports operational measurements, not an application performance benchmark.
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Stop a container safely, then start it again
Use graceful shutdown first
docker stop webdocker stop asks the container’s main process to exit cleanly. Docker sends the configured stop signal, normally SIGTERM, and waits through the configured grace period. If the process has not exited when that period ends, Docker sends SIGKILL. Graceful stopping gives applications an opportunity to flush data, close connections, and remove temporary state; it is the normal shutdown operation.
After stopping, confirm the state with docker ps -a and read the final log lines if the exit was unexpected. A container that remains listed but is stopped can be started again without creating a second container.
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Start the existing container
docker start webdocker start starts a stopped container using its existing configuration. It does not create a fresh container or apply new run-time options. If the process exits again immediately, inspect the state and logs before repeatedly restarting it; a restart loop can hide the original configuration or application error.
Reserve forced termination for a fallback
Forced termination is appropriate only when graceful shutdown cannot complete and the consequences are understood. It can interrupt cleanup and leave an application without time to flush state, so do not use a forceful command as the routine replacement for docker stop. Investigate why the main process ignores or exceeds its grace period before making forced termination part of an operating procedure.
Remove containers and understand automatic cleanup
Remove a stopped container explicitly
docker rm webdocker rm removes a container that is stopped. It removes the container object, not the image from which it was created. Verify the name and examine mounts before removing it, particularly when the container held state that another process still needs. If Docker reports that the container is running, stop it first and then retry the removal.
Use --rm for disposable runs
docker run --rm --name one-shot nginxWith --rm, Docker automatically removes the container after its process exits. Docker also removes anonymous volumes associated with that container. This is convenient for temporary jobs, but it changes your recovery options: once the process exits, the container object is no longer available for inspection or restart, and anonymous-volume data is removed with it.
Before adding --rm, determine how the application stores data and whether the mounts are anonymous or intentionally persistent. Do not use automatic cleanup for a workload whose stopped state, logs, or anonymous-volume contents you may need to investigate later.
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| Question | Command | What it provides |
|---|---|---|
| Which containers are active? | docker ps |
Running containers only. |
| What exists, including failures? | docker ps -a |
Running and stopped containers. |
| What did the application print? | docker logs -f NAME |
Captured output, optionally followed live. |
| What configuration and state did Docker record? | docker inspect NAME |
Detailed container metadata and state. |
| Can I run a diagnostic process inside it? | docker exec -it NAME sh |
An interactive process, if the shell exists and the container is running. |
| Which processes are present? | docker top NAME |
A process listing for the container. |
| Is it consuming unusual resources now? | docker stats NAME |
Streaming resource measurements for a running container. |
| Can the application shut down cleanly? | docker stop NAME |
Graceful stop with a signal and grace period. |
| Can I resume the same stopped instance? | docker start NAME |
Starts the existing stopped container. |
| Should this stopped object be discarded? | docker rm NAME |
Removes the stopped container object. |
Operate Compose-managed containers from the terminal
If the containers belong to a Compose project, use the Compose command family so that operations stay scoped to that project and its services. The syntax begins with docker compose rather than a single-container name:
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docker compose ps
docker compose logs
docker compose exec SERVICE sh
docker compose stop
docker compose start
docker compose downdocker compose ps shows the project’s service containers. Use logs for service output and exec to run a process in a selected service; provide the service name, and add sh only when that executable exists in the service image. The project-scoped stop and start operations let you pause and resume its services without switching to individual container IDs. Use down when the project should be taken down as a unit, after checking the project’s data and networking expectations.
Do not mix an ad-hoc docker run replacement into a Compose-managed application unless you intentionally want a separate container. Compose records the service definition, while a manually created container has a different lifecycle and is not controlled by the project commands.
A repeatable terminal runbook
- Discover: run
docker ps; if the expected service is missing, rundocker ps -ato include stopped instances. - Create only when needed: use a readable
--namewithdocker run. If that name already exists, inspect or start the existing object instead of creating a duplicate. - Observe: follow output with
docker logs -f NAMEand consultdocker inspect NAMEwhen configuration or state is unclear. - Diagnose in place: use
docker top NAMEfor processes,docker stats NAMEfor live usage, anddocker execfor an additional executable inside a running container. - Shut down cleanly: issue
docker stop NAME, allowing the configured signal and grace period to work. - Resume or retire: use
docker start NAMEto reuse the stopped instance, ordocker rm NAMEafter checking data and mounts. Choose--rmat creation time only for workloads where automatic container and anonymous-volume removal is acceptable.
Troubleshooting common command-line problems
“No such container”
Check spelling and whether you are addressing the correct daemon. Run docker ps -a and use the exact generated name, chosen name, or container ID shown there. If you expected a Compose service, run the Compose command in the project directory and use its service name rather than guessing a generated container name.
The container is absent from docker ps
The default listing excludes stopped containers. Use docker ps -a, then inspect logs and state. An exited primary process explains why docker exec cannot attach: exec requires a running container.
docker exec cannot find sh
The image may not contain that shell. Read the image’s available tools or use host-side logs and inspection. If you need a compound command, invoke an installed shell explicitly with sh -c; Docker will not parse && or other shell syntax on its own.
Stopping takes too long
The main process may be stuck or not handling the configured stop signal, or it may need more time than the grace period. Check logs and process state, then treat forceful termination as an exceptional fallback because it can interrupt cleanup and data flushing.
Data seems to have vanished after cleanup
Review the container’s mounts before using docker rm or selecting docker run --rm. Automatic removal also deletes associated anonymous volumes. Persistent application data must be mounted and managed deliberately rather than left in disposable container storage.
Bottom line
A web UI is optional: the Docker CLI exposes the entire practical container lifecycle. Name containers when you create them, discover them with ps, separate output diagnosis (logs) from configuration diagnosis (inspect), use exec only for additional processes in running containers, monitor with top and stats, stop gracefully, and remove objects only after checking their data. For Compose projects, keep the same discipline with the project-scoped docker compose commands.
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