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27.12.2020 Maintenance
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!! Linux
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!Get Version => Debian GNU/Linux 10.7 (buster)
{{{
cat /etc/debian_version
    10.7
cat /etc/issue
    Debian GNU/Linux 10
lsb_release -a
    No LSB modules are available.
    Distributor ID: Debian
    Description:    Debian GNU/Linux 10 (buster)
    Release:        10
    Codename:       buster
cat /etc/os-release
    PRETTY_NAME="Debian GNU/Linux 10 (buster)"
    NAME="Debian GNU/Linux"
    VERSION_ID="10"
    VERSION="10 (buster)"
    VERSION_CODENAME=buster
    ID=debian
    HOME_URL="https://www.debian.org/"
    SUPPORT_URL="https://www.debian.org/support"
    BUG_REPORT_URL="https://bugs.debian.org/"
hostnamectl
   Static hostname: v22018061954267647
         Icon name: computer-vm
           Chassis: vm
        Machine ID: [..]
           Boot ID: [..]
    Virtualization: kvm
  Operating System: Debian GNU/Linux 10 (buster)
            Kernel: Linux 4.19.0-13-amd64
      Architecture: x86-64
}}}
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Note: apt-get install lsb-release

! Update / Upgrade
To update current version see [Apt].\\
To upgrade to a new Linux version, you need to change the source for packages and run an update like before.
{{{
vi /etc/apt/sources.list
    deb http://ftp.debian.org/debian/ buster main
}}}
Note: check additional sources specified wihtin folder sources.list.d

!!MySQL / MariaDB
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! Get version => 10.3.27-MariaDB-0+deb10u1
{{{
mysql -u <user> -p
select version();
}}}
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! Upgrade / Storage
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After upgrading from Debian 9 to 10, mysql was gone. I installed MariaDB on top:
{{{
apt-get install mariadb-server
(mysql_secure_installation)

Start: /etc/init.d/mysql
Config: folder /etc/mysql/...
Log: /var/log/mysql
Bin: 
    /usr/bin/mysql 
    /usr/bin/mysqladmin
    /usr/sbin/mysqld
Database: folder /var/lib/mysql
}}}
/%