How to Kill or Stop Remote Docker Containers After Disconnecting from SSH скачать в хорошем качестве

How to Kill or Stop Remote Docker Containers After Disconnecting from SSH

Learn how to ensure your remote Docker container automatically stops when you disconnect your SSH session. This guide provides a simple solution using a bash script to handle SIGHUP signals. --- This video is based on the question https://stackoverflow.com/q/62332085/ asked by the user 'mugetsu' ( https://stackoverflow.com/u/949275/ ) and on the answer https://stackoverflow.com/a/62399707/ provided by the user 'mugetsu' ( https://stackoverflow.com/u/949275/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How to kill/stop remote Docker container after disconnecting SSH Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- How to Kill or Stop Remote Docker Containers After Disconnecting from SSH When you’re working with remote Docker containers, the convenience of SSH can sometimes lead to a scenario where you want your container to cease operations when you disconnect. This question often arises amongst developers and system administrators: How can I have a remote Docker container kill itself when I close my SSH connection? This post will break down a practical solution using a bash script that captures the signal indicating the termination of the SSH session. By following this guide, you can ensure your containers don't continue running unnecessarily after you've logged out. The Problem Explained You typically start a Docker container using commands like: [[See Video to Reveal this Text or Code Snippet]] While this approach works fine for starting a container and accessing it interactively, it presents a challenge: if you disconnect your SSH session, the container continues to run in the background. This behavior can waste resources and lead to unexpected results. The Solution: Using a Bash Script An elegant workaround involves using a simple bash script that listens for the SIGHUP (signal hang up) event. This signal is sent to processes when the terminal session is closed. By "trapping" this signal in your script, you can instruct it to stop your Docker container when the SSH session ends. Step-by-Step Guide Here’s how you can implement this solution: Prepare Your Script: Create a new bash script on the remote server where your Docker container is running. [[See Video to Reveal this Text or Code Snippet]] Add the Following Lines: [[See Video to Reveal this Text or Code Snippet]] Replace CONTAINER_NAME with the actual name or ID of your Docker container. This script sets a trap for the SIGHUP signal, telling the system to execute the docker stop CONTAINER_NAME command when the SSH connection is lost. Make Your Script Executable: [[See Video to Reveal this Text or Code Snippet]] Run the Script Over SSH: Now, execute your script while accessing your container: [[See Video to Reveal this Text or Code Snippet]] How It Works Trap Command: The trap command is a built-in shell command that allows you to specify actions that should occur when your script receives certain signals. In this case, it captures SIGHUP and runs docker stop CONTAINER_NAME. Sleep Loop: The while sleep 5; do ... done; loop keeps your script running, effectively keeping the SSH session alive until you choose to exit or disconnect. Automatic Container Shutdown: Once you disconnect your SSH session, the SIGHUP signal is triggered, executing the trap command and stopping the Docker container cleanly. Conclusion By implementing this bash script strategy, you can ensure that your Docker containers stop automatically when you disconnect from SSH. This not only saves resources but also aids in maintaining a clean environment on your remote server. Final Thoughts Utilizing simple scripting mechanisms like this can vastly improve your workflow when managing Docker containers remotely. If you encounter other challenges when using Docker, feel free to explore other creative scripting solutions! Remember to always test your script in a safe environment before deploying it in production. If you have any questions or need further assistance, feel free to leave a comment below!