Allows correct read/write  access to folders to which Apache should have access find . -type d -exec chmod 755 {} + find . -type f -exec chmod 644 {} + chown -Rf www-data:www-data *  

To handle High loaded Linux server requires a lot changes in Linux configuration One of theme is to edit  /etc/sysctl.conf file nano /etc/sysctl.conf net.ipv4.tcp_keepalive_time = 30 net.ipv4.tcp_keepalive_intvl = 10 net.ipv4.icmp_echo_ignore_all=1 net.ipv4.tcp_fin_timeout = 20 net.ipv4.tcp_synack_retries = 1 net.core.somaxconn=65536   This configurations allow to increase connection capabilities of Linux itself and is used if the server production server