What command enables httpd to start on boot?

• A. systemctl enable httpd
• B. systemctl start httpd
• C. systemctl is-enabled httpd to check
• D. service httpd enable

Answer: (A)

Enabling a service to start automatically on boot is done with systemd by marking the service to be started by the default boot target. Running systemctl enable httpd creates the necessary symlink in the systemd configuration (for example in the multi-user.target.wants directory) so that httpd is started automatically when the system boots. This is different from starting the service immediately (systemctl start httpd), which launches it now but doesn’t make it persist across reboots. If you want to verify whether httpd is configured to start at boot, you can use systemctl is-enabled httpd, which will say enabled or disabled. The older command to enable a service via the legacy SysVinit system (service httpd enable) isn’t the standard method on modern systemd-based systems.