Create Let's Encrypt Certificate Authority (CA), SSL Certificate in openSUSE Leap 15.x

If you're running apache2 web server in openSUSE Leap 15.x,
create a virtual host config file named /etc/apache2/conf.d/mydomain.example.com.conf

1. Configure apache2 for https:

# vim /etc/apache2/conf.d/mydomain.example.com.conf

 <VirtualHost *:443> 
 DocumentRoot "/srv/www/htdocs/owncloud" 
 ServerName mydomain.example.com 
 SSLEngine On 
 SSLCertificateFile /etc/certbot/live/mydomain.example.com/fullchain.pem 
 SSLCertificateKeyFile /etc/certbot/live/mydomain.example.com/privkey.pem 
 <Directory "/srv/www/htdocs/owncloud"> 
 DirectoryIndex index.html info.php index.php 
 Options FollowSymLinks 
 AllowOverride All 
 Require all granted 
 </Directory> 
 </VirtualHost> 

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# systemctl restart apache2

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2. Install certboot:

# zypper in certbot python-certbot python-certbot-apache

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3. Configure data for certboot:

# vim /etc/certbot/cli.ini

    rsa-key-size = 4096
    server = https://acme-v01.api.letsencrypt.org/directory
    email = mailaddress@something.com
    domain = mydomain.example.com
    authenticator = webroot
    webroot-path = /srv/www/htdocs/owncloud

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3.1. Configure data for letsencrypt:

# vim /etc/letsencrypt/cli.ini

    rsa-key-size = 4096
    server = https://acme-v01.api.letsencrypt.org/directory
    email = mailaddress@something.com
    authenticator = webroot
    webroot-path = /srv/www/htdocs/owncloud
    domain = mydomain.example.com

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4. Create cert:

# certbot --authenticator webroot --installer apache
# certbot --apache

# systemctl stop apache2
# systemctl start apache2

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5. Auto renew cert with cron, every 30 days in 2:00 AM:

# crontab -e

# SSL certificates renew
0 2 1 * *  /usr/bin/certbot renew

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How to manually delete old kernel on Ubuntu, Mint, Debian...

Open command line, and enter:

$ sudo uname -a
$ sudo dpkg --list | grep linux-image
$ sudo dpkg --purge linux-image{,-extra}-4.x.x-xxx-generic
$ sudo apt update && apt upgrade && apt autoremove