Where are Docker's system logs?

Docker is a popular open source container engine that helps developers build, package and run applications more easily. Although Docker simplifies the management and deployment of applications, it is important to review Docker's system logs when encountering problems in development and production.

Docker’s logs can be divided into two categories: container logs and daemon process (Docker daemon) logs.

Container log is the log information recorded by each Docker container, including errors and debugging messages that occur within the container. Docker's log driver will output container logs to stdout or stderr, and can also redirect them to the host's file or log collection system. To view the container's logs, you can use the docker logs command.

For example, to view the logs of a container named my_container, type the following command:

docker logs my_container

If the container outputs a lot of log information, you can use "less" or "tail" Wait for the command to view recent log messages.

Daemon logs are logs generated by the Docker daemon process, which usually include Docker daemon startup information, Docker configuration details, and Docker network and storage log information. Logs for the Docker daemon are typically stored in the host's system log files. Specifically, Docker stores system logs in the following locations across different operating systems:

• Linux: /var/log/messages
• macOS: /var/log/system. log
• Windows: event viewer

If you want to view the log of the Docker daemon on Windows, please use the following command:

Get-EventLog -LogName Application | Where-Object {$_.Source -eq "Docker"}

In short, view the Docker system Logs are very important, especially when dealing with problems. Container logs and daemon logs can help you diagnose problems and improve the reliability and performance of your Docker applications.

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