How to change the docker container command

There are two ways to change commands in a Docker container: Use Dockerfile to specify commands when creating the container. Use the docker update command to change the command after the container is created. After changing the command, the container needs to be restarted to make the new command take effect.

How to change commands in a Docker container

Changing commands in Docker containers is very simple, there are two main ways:

1. Use Dockerfile

When creating a container, you can use Dockerfile to specify the command to run. A Dockerfile is a text file containing instructions for building images. To change a command, specify a new command in the Dockerfile using CMD directive. For example:

 <code>FROM ubuntu:latest CMD ["/bin/bash"]</code>

2. Use docker update command

If the container has been created, you can use the docker update command to change the command. This command accepts a container ID or name, and a new command as an argument. For example:

 <code>docker update --name my-container --cmd "/bin/bash"</code>

What to do after changing the command?

After changing the command, you need to pay attention to the following:

• The container must be restarted: In order for the new command to take effect, the container must be restarted. You can use the docker restart command to restart.
• The changed command will overwrite the previous command: The CMD directive will overwrite any commands specified previously.
• Docker Compose: If you use Docker Compose to manage your container, you need to update the docker-compose.yml file to specify a new command.

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