A system administrator is troubleshooting a web server that runs in a container. After the log is retained, the container occasionally stops logging to a log file. Fortunately, the vendor provides a c

kill -HUP 1 sends SIGHUP (signal number 1) to PID 1, which is the main application process inside a container. SIGHUP is the standard Unix signal that instructs daemons and web servers to reload their configuration and reopen all open file handles, including log files that were rotated. Sending SIGHUP to the container's main process causes the application to reconnect to the current log file, which matches the described vendor signal behavior for resolving the logging gap after rotation.

SIGUSR1 is a user-defined signal available for application-specific custom use, but it is not the standard or conventional signal for log file reopening in web servers and does not match the described behavior.

SIGTERM is used to request graceful termination and shutdown of a process, not to trigger a configuration reload or log file reconnection.

SIGKILL forcibly and immediately terminates the process without allowing any signal handlers to run, which would stop the container entirely rather than reconnect its logging.