Quando tento executar o comando service apache2 start através do php shell_exec, ele mostra um erro no arquivo de log do apache: Failed to stop apache2.service: Interactive authentication required.
See system logs and 'systemctl status apache2.service' for details.
saída de systemctl status apache2.service
'' apache2.service - LSB: servidor web Apache2
Carregado: carregado (/etc/init.d/apache2; bad; predefinido do fornecedor: ativado)
Drop-In: /lib/systemd/system/apache2.service.d
-apache2-systemd.conf
Active: active (running) since Thu 2017-07-06 11:21:37 IST; 3h 46min ago
Docs: man:systemd-sysv-generator(8)
Process: 8575 ExecStop=/etc/init.d/apache2 stop (code=exited, status=0/SUCCESS)
Process: 8826 ExecStart=/etc/init.d/apache2 start (code=exited, status=0/SUCCESS)
CGroup: /system.slice/apache2.service
|- 8841 /usr/sbin/apache2 -k start
|- 8844 /usr/sbin/apache2 -k start
|- 8845 /usr/sbin/apache2 -k start
|- 8846 /usr/sbin/apache2 -k start
|- 8847 /usr/sbin/apache2 -k start
|- 8848 /usr/sbin/apache2 -k start
|- 8887 /usr/sbin/apache2 -k start
|-17927 /usr/sbin/apache2 -k start
|-18596 sh -c ping 8.8.8.8
|-18597 ping 8.8.8.8
|-18600 sh -c ping 8.8.8.8
|-18601 ping 8.8.8.8
|-18732 /usr/sbin/apache2 -k start
|-21117 sh -c systemctl status apache2.service
-21118 systemctl status apache2.service