Upgrade Debian 8 Jessie to 9 Stretch

Pre upgrade recommendations:
– run a full backup of your running system
– run a backup of all your databases and binary logs (if your database sizes are not explosive big…)
– remove unnecessary third party packages or repositories

During the upgrade-process, MySQL will be replaced by MariaDB

Upgrade current system:

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apt-get update && apt-get upgrade

Edit sources, replace wheezy through jessie:

sed -i 's/jessie/stretch/g' /etc/apt/sources.list

Peform the upgrade to debian jessie:

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apt-get update
apt-get upgrade
apt-get dist-upgrade

Perform a system reboot:

init 6

Print distribution-specific information:

lsb_release -a