How to view tomcat logs with docker

When running Tomcat in a Docker container, it is very important to review the log files generated by the application. When using Tomcat, the generated logs are usually located in the Tomcat log directory, and Tomcat in the Docker container also has its own log directory. This article will introduce how to view Tomcat logs in a Docker container.

Step 1: Enter the Docker container

First, we need to use the following command to enter the Docker container:

docker exec -it <container_id_or_name> /bin/bash

Where, <container_id_or_name> is Refers to the container ID or container name of the Tomcat container running in Docker.

Step 2: Enter the Tomcat log directory

After entering the Docker container, we can use the following command to enter the Tomcat log directory:

cd /usr/local/tomcat/logs

This will enter the Tomcat log in the container Default directory.

Step 3: View Tomcat log files

In the Tomcat log directory, we can use the following command to list all Tomcat log files:

ls -l

You can see that Tomcat is in Multiple log files are generated by default in this directory, including:

• catalina.out: Tomcat console log.
• catalina..log: Tomcat’s log since the last restart. The date format is "yyyy-MM-dd".
• localhost..log: Log of requests from localhost (localhost) processed by Tomcat every day.

Step 4: View Tomcat log content

In the Tomcat log directory, use the following command to view the log file content:

tail -f catalina.out

This will display The last 10 lines of catalina.out, and then keep outputting new content until you press "Ctrl C" to stop.

To view other log files, simply replace the filename with the desired filename.

Conclusion

When running Tomcat in a Docker container, it is very important to view the Tomcat logs. By entering the container and viewing the log directory, we can easily view the various log files generated by Tomcat and understand the running status of Tomcat.

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