Have you ever accidentally committed to master? )
To prevent this from happening again, I just added to my .bashrc:
cd ~/my_git_repo && git checkout vitich && cd -

Install python-docx and parallel:

$ sudo apt install python-docx parallel

Save this code as /usr/local/bin/docx_author:

You need your own telegram bot (@BotFather) and channel to receive messages from your bot
Place this script to your bin directory, edit bot token and chat id and add tthe script to crontab.
Add your domain list (one per line) to ~/domains.txt.

1) Shell:
$ echo -n '00:25:90:cd:26:da' | xxd -r -p | openssl dgst -sha1 -mac HMAC -macopt hexkey:8544E3B47ECA58F9583043F8 | awk '{print $2}' | cut -c 1-24 | fold -w4 | paste -sd'-'
857a-b7a9-4a4c-103e-3a8c-c044

Check crt file:
$ openssl x509 -in site.crt -text -noout | grep Not
Not Before: Dec 5 11:54:00 2019 GMT
Not After : Dec 1 11:54:00 2034 GMT

Check ssl certificate online:
$ echo | openssl s_client -showcerts -servername gnu.org -connect gnu.org:443 2>/dev/null | openssl x509 -inform pem -noout -dates
notBefore=Dec 14 10:03:25 2019 GMT
notAfter=Mar 13 10:03:25 2020 GMT

1) Save backup

if you have enough free space on the server you can backup your server locally to /home/backup:
mkdir -p /home/backup

My friend asked me to help with the migration of mail from a server running ispmanager5 lite to a server running vestacp. But this script is suitable for migration from any imap server to hestiacp panel.
I found imapsync utility and I'll use it. The email.txt file should contain a list of mailboxes and passwords, one account per line.

Create server:
hcloud server create --name=myserver --image=ubuntu-18.04 --type=cx31 --datacenter=hel1-dc2 --ssh-key=vitich

List our servers to get server ID:
hcloud server list

Add floating-ip
hcloud floating-ip create --type=ipv4 --home-location=hel1

List floating-ip to get floating-ip ID:
hcloud floating-ip list

Якщо ви користуєтеся IP-KVM / iLO / IPMI то мабуть Ви стикалися з помилкою "java application blocked by security settings".

Вирішується достатньо просто:

echo "https://10.0.0.1" >> ~/.java/deployment/security/exception.sites

Якщо хочеться додати всі можливі адреси в локальній мережі, то робимо скрипт і додаємо свої мережі: