Docker application log storage location

Docker logs are usually stored in the /var/log directory of the container. To access the log file directly, you must use the docker inspect command to obtain the log file path, and then use the cat command to view it. You can also use the docker logs command to view the logs and add the -f flag to continuously receive the logs. When creating a container, you can use the --log-opt flag to specify a custom log path. In addition, logging can be recorded using the log driver, LogAgent, or stdout/stderr.

Docker application log storage location

Direct access to container log files:

• While the container is running, run the following command to find the log file:

   <code>docker inspect <container_name> | grep LogPath</container_name></code>

• After finding the log file, use the cat command to view:

   <code>cat <log_file></log_file></code>

Use the docker logs command:

• Run the following command to view the container log:

   <code>docker logs <container_name></container_name></code>

*The log can be received continuously using the -f flag:

 <code>docker logs -f <container_name></container_name></code>

Configure custom log paths:

• When creating a container, you can use --log-opt flag to specify a custom log path:

   <code>docker run --log-opt max-size=50m --log-opt max-file=3 <image_name></image_name></code>

• After the container is run, verify the log path with the following command:

   <code>docker inspect <container_name> | grep LogPath</container_name></code>

Other methods:

• Using log drivers: Docker provides a variety of log drivers, such as json-file and syslog , allowing logs to be stored on external targets.
• LogAgents such as Fluentd and Logstash can collect and centralize logs from multiple containers.
• Use stdout/stderr: The application can write log information to standard output or standard errors, which can be accessed through the docker logs command.

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