Recreate /boot directory on Centos 7

chroot / rescue / whatever

mv /boot{,.old}
mkdir -p /boot
chmod 0555 /boot
yum reinstall kernel -y
grub2-install /dev/xxx
grub2-mkconfig /boot/grub2/grub.cfg
ln -s /boot/grub2/grub.cfg /etc/grub2.cfg

Magento: white screen, 404 errors

Magento: white screen, 404 errors

add to index.php

ini_set('error_reporting', E_ERROR);
register_shutdown_function("fatal_handler");
function fatal_handler() {
    $error = error_get_last();
    echo("<pre>");
    print_r($error);
}

via: https://stackoverflow.com/questions/4784117/magento-how-to-debug-blank-white-screen

Magento: high MySQL load at_is_active.value_id > 0

High MySQL load, queries like

SELECT `e`.*, IF(at_is_active.value_id > 0, at_is_active.value, at_is_active_default.value) AS `is_a

run:

php -f shell/indexer.php reindexall –all 

nginx + cloudflare ssl = redirect loop solution

server {
   listen         80;
   server_name    example.com

   if ($http_x_forwarded_proto = "http") {
     return 301 https://$server_name$request_uri;
   }

}

SSH key restrict login

no-port-forwarding,no-agent-forwarding,no-X11-forwarding,command="echo 'Please login as the user \"XYZ\" rather than the user \"root\".';echo;sleep 10" KEY

WHM login without root password

whmapi1 create_user_session user=root service=whostmgrd locale=en

grub2 centos 7 rescue

grub> set prefix=(md/md2)/boot/grub2
grub> set root=(md/md2)
grub> insmod linux
grub> normal

The cPanel user X does not exist in the database map.

The cPanel user X does not exist in the database map.

Mysql::initcache failed: adminbin Cpanel/cpmysql/DBCACHE: exit 255

fix:

/scripts/rebuild_dbmap username

EFI grub centos 7

grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg
yum reinstall grub2-efi grub2-efi-modules  shim

https://community.centminmod.com/threads/grub-help.12867/page-3

without EFI

grub2-mkconfig –o /boot/grub2/grub.cfg

curl domain on ip

curl -v -H "Host: example.com" http://127.0.0.1