GNU/Linux hacks

Show folders size sorted:

root@mail:~# du -h --max-depth=1 /home/admin/mail/ | sort -h


Route tricks

Show routes:

route -n

Add route:

sudo route del -net gw netmask dev eth0

Delete route:

sudo route del -net gw netmask dev eth0

Metrics setup:

apt-get install ifmetric
route -n #Lookup for network interface name
ifmetric ens160 50

How to setup DKIM for VestaCP mail server:

#In terminal run:

v-list-mail-domain-dkim admin [email protected]

#then copy second part of key and create TXT DNS record

mail._domainkey IN TXT "v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDX1GP0moxNsD3y/E3pcuUkOe4e b/vOC95BuQSrpCK0ofD23ayL+/qRrWWXai6wQXg1KKuE43455453BUF1WMZjJ3neyXinuSoDf2thniTyn2NicmXmU3/AN5XA/J6xAPm5CHI8LMArXp+VcERzVCWFrYLCC2yLTSgHx1E/qJu2B2QIDAQAB" ; ----- DKIM key dkim for

Don’t start MySQL / MariaDB after server resizing

After deleting /var/lib/mysql/tc.log and restarting everything worked fine again  

See also  Auto update IP address via Post Query for Dynamic DNS Services UNIX

How to disable cloud-init in Ubuntu

Prevent start

  • Create an empty file to prevent the service from starting sudo touch /etc/cloud/cloud-init.disabled


  • Disable all services (uncheck everything except “None”): sudo dpkg-reconfigure cloud-init
  • Uninstall the package and delete the folders sudo dpkg-reconfigure cloud-init sudo apt-get purge cloud-init sudo rm -rf /etc/cloud/ && sudo rm -rf /var/lib/cloud/
  • Restart the computer sudo reboot

How to FIX VestaCP mail server Gmail mailing troubles:

Letsencrypt update set wrong (root:root) chwon’s. /home/admin/conf/web/ chown mail:mail (ca, crt, key, pem)

Midnight Commander – move to menu – F9 (Fn+F9 Mac default)

Mysqlclient cannot install via pip, cannot install via pip, cannot find pkg-config name in Ubuntu

sudo apt-get install python3-dev default-libmysqlclient-dev build-essential

Fixed the dependency.

See also  Windows hacks


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