Dcoker ENTRYPOINT

The ENTRYPOINT is a Docker instruction that specifies the command to be executed when a container is started from an image. It is the first command that runs when the container is started, and it cannot be overridden by any command-line arguments or Dockerfile instructions.

The ENTRYPOINT instruction is usually used to specify the main process or application that the container is designed to run. For example, if a container is built to run a web server, the ENTRYPOINT instruction would specify the command to start the web server.

Here is an example of using the ENTRYPOINT instruction in a Dockerfile to define the main command for a container:

FROM ubuntu:latest

# Install dependencies
RUN apt-get update && apt-get install -y \
    apache2 \
    php \
    php-mysql

# Set the working directory
WORKDIR /var/www/html

# Copy the application files
COPY . .

# Set the entrypoint
ENTRYPOINT [ "/usr/sbin/apache2ctl", "-D", "FOREGROUND" ]

In this example, the ENTRYPOINT instruction sets the command to start Apache web server in foreground mode. When a container is started from this image, the Apache server will start automatically and run as the main process inside the container.