Debugging an application running in a Docker container can be similar to debugging an application running outside of a container, although there are a few extra steps involved. Here are some ways to debug an application running inside a Docker container:
1. Interactive Shell: You can start a Docker container with an interactive shell. This lets you directly access the application in the container, which can be helpful when debugging.
For example: If you are using a Linux-based container and bash is installed, you can use the command `docker run -it1. Docker Logs: Docker provides the `docker logs` command, which displays the logs for a container. The logs can contain valuable information about the application and are useful for debugging.
For example: Use `docker logs1. Remote Debugging: Some Integrated Development Environments (IDEs) and languages support remote debugging, and you can use this capability with Docker. You will need to install the necessary debugging tools inside your container and configure your IDE to connect to the debug server running inside your container.
1. Debuggers inside Docker: You can install and use debuggers or other development tools directly inside your Docker containers. You need to include the tools in your Dockerfile, and you usually don’t want to include these tools in containers running in your production environment.
1. Docker Debug mode: You also can start Docker in debug mode by using parameter `-D` or `—debug`.
Remember, debugging tools can increase the size of your containers and can create potential security risks. It is a good idea to use multistage builds or other techniques to ensure debugging tools aren’t present in your production containers.
