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Docker container monitoring and inspection

Docker container monitoring and inspection involves using specific CLI commands to observe the runtime state, resource usage, and internal details of containers. These tools are essential for debugging and ensuring the stability of deployed services.

Core Inspection Commands

To understand the low-level details of a container, use the docker inspect command.^[600-developer__docker__docker.md] This command returns detailed JSON-formatted data regarding the container's configuration and state, including IP addresses, bind mounts, and resource limits^[600-developer__docker__docker.md].

Monitoring Runtime Processes

You can view the running processes inside a specific container using the docker top command^[600-developer__docker__docker.md]. This allows you to see which internal processes are active without attaching to the container directly.

Another common monitoring command is docker logs, which is often used with specific flags to view the output stream (stdout/stderr) of a container^[600-developer__docker__docker.md].

Listing Containers

Monitoring the system state involves listing active and inactive containers.

  • Running Containers: docker container ls (or docker ps) lists all currently running containers^[600-developer__docker__docker.md].
  • All Containers: docker container ls -a lists all containers, including those that are stopped or exited^[600-developer__docker__docker.md].

Sources

^[600-developer__docker__docker.md]