Configuring the Dockerfile for Executable Web-Server Containers
Question
A DevOps engineer has built a container to host a web-server and it must run as an executable.
Which command must be configured in a Dockerfile to accomplish this goal?
Answers
Explanations
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A. B. C. D.B.
The correct answer is B. ENTRYPOINT ["/usr/sbin/apache2ctl", "-D", "FOREGROUND"].
In a Dockerfile, the ENTRYPOINT command is used to set the primary command that should be run when a container is launched from the image. It specifies the executable that should be run and any arguments or options that should be passed to it.
Option A, ENTRYPOINT <usr/sbin/apache2ctl>, uses angle brackets instead of square brackets to define the command, which is incorrect syntax.
Option C, ENTRYPOINT ["BACKGROUND", "-D", "/usr/sbin/apache2ctl"], uses the wrong executable name "BACKGROUND" and has the order of the arguments wrong, as "-D" should come before the path to the executable.
Option D, ENTRYPOINT {usr/sbin/apache2ctl}, also uses incorrect syntax and is missing the square brackets.
Option B, ENTRYPOINT ["/usr/sbin/apache2ctl", "-D", "FOREGROUND"], is the correct syntax for specifying the command to be run in the container. It sets the command to run the Apache web server using the "/usr/sbin/apache2ctl" executable, with the "-D FOREGROUND" option to run the server in the foreground mode.
