Docker Tutorial

• Docker Tutorial
• Docker Architecture

Docker Installation

• Ubuntu Docker Installation
• Debian Docker Installation
• CentOS Docker Installation
• Windows Docker Installation
• MacOS Docker Installation

How to use Docker

• Docker Hello World
• Docker Container
• Docker Image
• Docker Container Connection
• Docker Rpository
• Docker Dockerfile
• Docker Compose
• Docker Machine
• Docker Swarm

Docker Instance

• Docker install Ubuntu
• Docker install CentOS
• Docker install Nginx
• Docker install Node.js
• Docker install PHP
• Docker install MySQL
• Docker install Tomcat
• Docker install Python
• Docker install Redis
• Docker install MongoDB
• Docker install Apache

Docker Container Lifecycle Command

• Docker run command
• Docker start/stop/restart commands
• Docker kill command
• Docker rm command
• Docker pause/unpause command
• Docker create command
• Docker exec command

Docker Container Operation Command

• Docker ps command
• Docker inspect command
• Docker top command
• Docker attach command
• Docker events command
• Docker logs command
• Docker wait command
• Docker export command
• Docker port command

Docker Container rootfs Command

• Docker commit command
• Docker cp command
• Docker diff command

Docker Mirror Repository Command

• Docker login/logout command
• Docker pull command
• Docker push command
• Docker search command

Docker Local Image Management Command

• Docker images command
• Docker rmi command
• Docker tag command
• Docker build command
• Docker history command
• Docker save command
• Docker load command
• Docker import command

Docker info|version Command

• Docker info command
• Docker version command

Docker top command

The docker top command is used to display the running processes within a Docker container. It provides a snapshot of the container's process list at the time the command is executed. This can be helpful for troubleshooting, monitoring resource usage, or identifying running processes in a container. In this tutorial, we'll cover the basics of using the docker top command.

Syntax:

docker top CONTAINER [ps OPTIONS]

• CONTAINER: The name or ID of the container you want to display the running processes for.
• ps OPTIONS: Optional arguments that you can pass to the ps command (the process status command used by Unix systems). These arguments can help you customize the output.

Examples:

1. Display running processes in a container:

   docker top my_container
   

   Replace my_container with the name or ID of the container you want to inspect. This command will display a table of running processes, including information such as the process ID, user, CPU usage, memory usage, and command.

2. Display running processes with custom formatting:

   docker top my_container -eo pid,user,cmd
   

   Replace my_container with the name or ID of the container you want to inspect. This command will display a table of running processes with only the process ID, user, and command columns.

The docker top command provides a snapshot of the running processes within a container, which can be useful for troubleshooting, monitoring, or identifying processes.

1. Docker Top Command Usage and Options:

   • Description: The docker top command is used to display the running processes inside a running Docker container.

   • Code Example:

     docker top container_id
     

2. Monitoring Docker Container Processes with Top:

   • Description: Use docker top to monitor and view the processes running inside a Docker container.

   • Code Example:

     docker top my_container
     

3. Viewing Resource Utilization in Docker Using Top:

   • Description: docker top provides information on CPU and memory usage of processes within a container.

   • Code Example:

     docker top my_container
     

4. Interactive Process Viewing in Docker Containers:

   • Description: Interactively view processes within a running Docker container.

   • Code Example:

     docker exec -it my_container sh
     top
     

5. Real-Time Monitoring of Docker Containers Using Top:

   • Description: Use docker top with real-time updates to continuously monitor container processes.

   • Code Example:

     watch docker top my_container
     

6. Alternatives to Docker Top for Container Inspection:

   • Description: Alternatives like docker exec with tools such as htop or ps can be used for more detailed container inspection.

   • Code Example (Using htop):

     docker exec -it my_container htop
     

7. Troubleshooting with Docker Top Command:

   • Description: Use docker top to troubleshoot and identify resource-intensive processes within a container.

   • Code Example:

     docker top my_container