dump_io有効化
Ubuntu 18.04.5 LTS
w=/etc/apache2/conf-available/999_custom_dump_io.conf
e=/etc/apache2/conf-enabled/999_custom_dump_io.conf
sudo a2enmod dump_io
{
echo "DumpIOOutput On";
echo "LogLevel dumpio:trace7";
} | sudo tee -a $w
ln -s $w $e
sudo systemctl restart apache2