Docker Set Restart Policy on Running Container - Shell-Bash

As a programmer, you may find yourself needing to set a restart policy for a running container in Docker. This can be useful for ensuring that your containers are always available and running, even in the event of unexpected crashes or failures.

Thankfully, Docker provides a simple command-line interface for setting restart policies on running containers. In this guide, we'll walk through the steps required to set a restart policy using Shell-Bash.

Prerequisites

Before we get started, make sure you have the following items installed:

• Docker (version 1.12 or higher)
• Shell-Bash command-line interface

Steps

1. First, you'll need to identify the running container you want to set a restart policy for. You can do this by running the following command:

   docker ps
   

   This will list all of the currently running containers on your system, along with their respective container IDs.

2. Once you've identified the container you want to set a restart policy for, use the following command to set the restart policy:

   docker update --restart=always [CONTAINER ID]
   

   Replace [CONTAINER ID] with the actual ID of the container you want to update.

   This command will set the restart policy of the specified container to "always", which means that Docker will automatically restart the container in the event of a failure or unexpected shutdown.

   Other restart policies that can be set include "no" (which means that Docker will not automatically restart the container), "on-failure" (which will only restart the container if it exits with a non-zero exit code), and "unless-stopped" (which will only stop the container if it is explicitly stopped by the user).

3. Finally, you can use the following command to confirm that the restart policy has been set:

   docker inspect [CONTAINER ID] | grep RestartPolicy
   

   This will display the current restart policy for the specified container.

Congratulations! You've successfully set the restart policy for a running Docker container using Shell-Bash. Your container will now be more resilient to unexpected failures and downtime.