How to read logs when docker container keeps restarting

When the Docker container keeps restarting, you can view the logs by using the following method: Use the docker logs [container name or ID] command to output the standard output and error streams of the container. View container logs in Docker Dashboard. Specify the log volume in the docker-compose file. Set the log level to "debug" for more detailed information. Use the grep command to filter the logs to display only messages for specific keywords. Use -f to trace the logs and view them in real time.

Check the logs when the Docker container keeps restarting

When the Docker container keeps restarting, looking at the logs can help diagnose the problem.

To view the container logs, use the following command:

docker logs <容器名称或ID>

For example:

docker logs my-container

This command will output the standard output and standard error streams of the container. If you see error messages or warnings, they can help you understand why the container restarted.

Other ways to view logs:

• Docker Dashboard:If you use Docker Dashboard, you can view container logs in the interface . Just click on the target container and go to the "Logs" tab.
• docker-compose:If you use docker-compose to manage containers, you can specify log volumes in the compose file. This creates a persistent volume that contains all container logs.

Log Level:

Docker allows you to set the log level to control the number of messages displayed in the log. By default, the log level is "info". To see more details, you can set the log level to "debug". Set the log level using the following command:

docker logs --level=debug <容器名称或ID>

Filter the log:

Sometimes, the logs may contain a lot of information. You can use thegrepcommand to filter the logs to only display messages containing specific keywords. For example, the following command will only display messages containing the "error" keyword:

docker logs <容器名称或ID> | grep error

Trace the log:

To track the log and view it in real time, you can use-fflag. This will log continuously until you press Ctrl C to stop.

docker logs -f <容器名称或ID>

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