The quickest way to read a container’s output is docker logs <CONTAINER>. Add --follow (or -f) for a live stream, --tail 100 for the last 100 lines, and --since/--until to restrict the time range. These commands show what the container process writes to standard output and standard error; they do not automatically read application log files inside the container.
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What Docker container logs contain
Docker captures the endpoint process’s STDOUT and STDERR. The docker logs command reads those captured streams through the container’s configured logging driver. A game server, web service, or worker that writes status lines and errors to its console therefore appears in docker logs.
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Files such as /var/log/app.log are a separate matter. Docker does not automatically open arbitrary files in the container and merge them into the log stream. The application must write those messages to standard output or standard error, or deliberately link or redirect its file logging to one of those streams. If it only writes a file, use the application’s own file-viewing method or change its logging configuration.
Docker describes follow mode this way: “The docker logs --follow command will continue streaming the new output from the container’s STDOUT and STDERR.” Follow mode ends when you press Ctrl-C; stopping the display does not stop the container.
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Before you run a log command
Confirm that the Docker CLI can reach the daemon
Run a harmless inventory command first:
docker psIf the command reports a daemon connection or permission error, fix that access problem before diagnosing the application. On a host where your user is not allowed to access Docker’s socket, run the command with the appropriate administrative privileges for that installation, commonly sudo docker ps. Avoid adding broad permissions without understanding the security implications of Docker socket access.
Find the container name or ID
docker ps lists running containers. Include stopped containers with:
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Read logs once, from beginning to end
After identifying the target, request its captured output:
docker logs <CONTAINER>The equivalent long form is:
docker container logs <CONTAINER>Docker prints the available entries and exits. For a very busy service, an unrestricted request can produce a large amount of text, so use a tail or time filter when you need a focused incident window.
Follow a container’s logs live
To watch new entries as they arrive, use:
docker logs --follow <CONTAINER>The short option is:
docker logs -f <CONTAINER>Follow mode is useful while starting a service, joining a game server, loading a mod, or reproducing a crash. Existing entries are printed first, then the command waits for new standard-output and standard-error records. Press Ctrl-C to leave the stream. This only detaches your terminal from the log view; it does not send a stop signal to the container.
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Limit the amount of output
Show the last 100 lines
Use the line-count option:
docker logs --tail 100 <CONTAINER>The short spelling is -n 100. Replace 100 with the number of lines you need. Docker documents the default as all, meaning an invocation without --tail requests every retained entry. A tail is counted from the end of the retained log, not from the container’s process start time.
Combine a tail with live follow mode
To see recent context and then continue watching:
docker logs --follow --tail 100 <CONTAINER>This is generally more practical than following an unbounded history on a busy server. The first 100 retained lines provide context; subsequent records are streamed as they are written.
Add timestamps and driver details
Print timestamps
Add RFC3339Nano timestamps with:
docker logs --timestamps <CONTAINER>Use -t as the short form. Timestamps make it easier to correlate a container event with a host alert, a deployment, or another service’s log. You can combine them with every other normal log option, for example:
docker logs -t --tail 100 <CONTAINER>Include logging-driver attributes
If the configured driver supplies extra attributes, request them with:
docker logs --details <CONTAINER>--details does not create new metadata. It only includes attributes made available by the logging configuration, so the amount of additional information varies by driver and its options.
Filter logs by time
Use a relative duration
To display entries from the last hour:
docker logs --since 1h <CONTAINER>Docker accepts Go-style durations such as 42m. This is useful when investigating a restart or failed deployment without guessing an exact clock time.
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Use an absolute timestamp or Unix time
--since also accepts an RFC3339 date or a Unix timestamp. For example:
docker logs --since 2026-10-15T12:00:00Z <CONTAINER>Use the timestamp format and timezone that match the event you are investigating. An explicit UTC suffix such as Z avoids confusing a local clock reading with UTC.
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Set an upper boundary with --until
When you need a closed interval, add --until:
docker logs --since 2026-10-15T12:00:00Z --until 2026-10-15T12:30:00Z <CONTAINER>The upper-bound option accepts a timestamp or relative duration. Docker documents --until support for API version 1.35 and newer. If a client or daemon is older than that API level, check the installed Docker version before relying on it.
Use time and line filters together
Options can be combined. For example, this follows only recent output while retaining a manageable initial snapshot:
docker logs --follow --since 15m --tail 100 <CONTAINER>Use --since/--until when the incident has a known time window; use --tail when the number of recent lines is the useful boundary. They answer different questions and should not be treated as interchangeable filters.
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Command reference
| Need | Command | What it does |
|---|---|---|
| Read all retained output | docker logs <CONTAINER> |
Prints captured standard output and standard error, then exits. |
| Read a stopped container | docker ps -a followed by docker logs <CONTAINER> |
Includes containers that are no longer running. |
| Watch new entries | docker logs -f <CONTAINER> |
Prints available output and keeps streaming new records. |
| Show the last 100 lines | docker logs --tail 100 <CONTAINER> |
Limits the initial output to the end of the retained log. |
| Add event times | docker logs -t <CONTAINER> |
Adds RFC3339Nano timestamps. |
| Read the last hour | docker logs --since 1h <CONTAINER> |
Shows entries after a relative one-hour boundary. |
| Read a bounded interval | docker logs --since <START> --until <END> <CONTAINER> |
Restricts output to the supplied start and end values. |
| Show driver attributes | docker logs --details <CONTAINER> |
Includes extra attributes supplied by the logging driver, when configured. |
Why docker logs shows nothing
The process has not written to standard output or standard error
A running container can legitimately have an empty log stream. Some applications log only to files, remain quiet until a request arrives, or buffer output. Check the application’s logging mode and its internal log location. Docker will not import a file merely because it is under /var/log.
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You selected the wrong container
Names can be similar after a deployment or restart. Re-run docker ps -a, copy the exact name or ID, and inspect the container that actually owns the process. If a compose-style deployment creates several services, query each service container separately.
The container exited before producing output
A stopped container’s logs remain queryable when its logging driver retained them. Use docker ps -a to find the exit, then run docker logs against that container. If it was removed, its local container metadata and associated logs may no longer be available.
The logging driver does not provide readable logs to the CLI
The driver determines where records are stored and whether the Docker API can return them. A driver that sends records to an external file, host, database, or other backend may return little or no useful data through docker logs, especially when dual logging is disabled. In that case, consult the configured destination rather than repeatedly increasing the tail size.
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Some runtimes buffer console output. If a message appears only when the process exits or a buffer fills, Docker cannot display it earlier; the delay occurs before Docker receives the record. Configure the application or runtime for unbuffered or line-buffered output when timely diagnostics are required.
Check the container’s logging driver
Use Docker inspection to see the driver configured for a particular container:
docker inspect -f '{{.HostConfig.LogConfig.Type}}' <CONTAINER>The result identifies the driver used by that container, not merely the daemon’s current default. Docker documents json-file as the default compatibility driver and also supports drivers such as local and journald. Other drivers can route records to an external system with different retention and retrieval commands.
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Driver settings belong to the container configuration. Changing the daemon’s default later does not retroactively convert existing containers. Verify the actual container before assuming that a host-wide setting explains its behavior.
Understand json-file storage and safe access
With the JSON-file driver, each record contains the message, the stream that produced it, and a timestamp. Docker warns that these files are intended to be accessed by the Docker daemon. Do not treat files under /var/lib/docker/... as ordinary application logs to parse, truncate, or edit during normal operations.
Direct manipulation can break the daemon’s assumptions about file ownership, rotation, or record format. Use docker logs for reading, and configure rotation through Docker rather than deleting bytes from the storage path. If an external collector is required, configure an appropriate logging driver or collection mechanism instead of scraping daemon-managed files.
Prevent unrotated logs from filling the disk
Docker warns that unrotated JSON-file logs can consume significant disk space. Configure size and file-count limits in the Linux host’s /etc/docker/daemon.json:
{"log-driver": "json-file", "log-opts": {"max-size": "10m", "max-file": "3"}}The values under log-opts must be strings in daemon.json, including numeric-looking values such as 10m and 3. Validate the JSON syntax before restarting Docker; an invalid daemon configuration can prevent the service from starting.
On a systemd-based Linux host, restart the daemon with:
sudo systemctl restart dockerThese defaults apply to containers created after the configuration change. Existing containers keep the logging configuration they were created with, so recreate those containers when you need them to adopt the new rotation policy. Plan that recreation around the workload’s persistence and deployment process; recreating a container is not the same as restarting its process.
Container logs versus Docker daemon logs
docker logs explains what a container process emitted. It does not explain why the Docker daemon itself failed to start, lost its socket, or rejected a host-level configuration. For daemon problems on Linux, query the systemd journal:
sudo journalctl -xu docker.serviceTo follow daemon messages live, use:
sudo journalctl -fu docker.serviceDepending on the Linux distribution, related daemon messages may also appear in /var/log/syslog or /var/log/messages. Use those host logs when the Docker service is unhealthy, while reserving docker logs for a container’s captured application streams.
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A practical troubleshooting sequence
- List the target. Run
docker ps; usedocker ps -aif the service may have stopped. - Request a bounded snapshot. Start with
docker logs --tail 100 -t <CONTAINER>so the output is readable and time-labeled. - Expand the time window. Use
--sincefor the period surrounding the failure and add--untilwhen the incident has a known end. - Reproduce while following. Run
docker logs --follow --tail 100 <CONTAINER>, repeat the failing action, and stop the display withCtrl-C. - Check the logging driver. Run the inspection command and determine whether the records are local, journal-based, or sent to an external backend.
- Separate application and daemon failures. If Docker itself is failing, switch to
journalctl -xu docker.servicerather than expecting a container’s output to explain the host problem.
Choosing the right viewing approach
| Approach | Best for | Boundary |
|---|---|---|
Live stream with -f |
Watching startup, reproducing a fault, or monitoring a service interactively | Requires an active terminal and only shows records exposed by the driver. |
Bounded snapshot with --tail |
Quick context from a busy container | Counts lines, not elapsed time; older relevant events may be outside the selected count. |
Time window with --since/--until |
Correlating output with an incident, deployment, or alert | Depends on accurate timestamps and documented API support for --until. |
| Container process logs | Application messages emitted on standard output or standard error | Does not read arbitrary files inside the container. |
| Docker daemon journal | Startup, socket, service, and host-level Docker failures | Does not replace the container log stream. |
| External aggregation backend | Central retention, search, and logs from multiple hosts | Retrieval uses the backend’s tools; docker logs may be limited when dual logging is disabled. |
Operational habits that avoid surprises
- Use
docker ps -aduring crash investigations so an exited container is not overlooked. - Start with
--tailor a time window on high-volume services instead of dumping every retained record. - Add
--timestampswhen correlating a game-server event with host, network, or deployment activity. - Keep application diagnostics on standard output and standard error when you expect Docker-native retrieval.
- Inspect the per-container logging driver before assuming that all hosts retain logs in the same place.
- Configure rotation for JSON-file logging and recreate existing containers after changing daemon defaults.
- Use the Docker daemon journal for daemon failures; container output cannot diagnose a daemon that is not running.
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