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Tech C**P
How do you upgrade Icinga2 from a very old version? The short answer is that you need to do an incremental upgrade on its database. But how exactly? apt-get update apt-cache policy icinga2-ido-mysql The candidate section displays what version is available…
In case your upgrade failed, try to start icinga service and in the meantime check the logs in another console:

service icinga2 start

Check logs to see what is the error:

tail -f /var/log/icinga2/icinga2.log

If it point to a specific config file, change the config as reported or in case you don't need it remove it. It happened for me on another Icinga2 server and I removed the old config and tried to apply the new schemas. It gave another error on mysql grants, I gave all permissions to the icinga2 user:

mysql -u root -p
GRANT ALL PRIVILEGES ON icinga2_database_name.* TO 'icinga2_username'@'localhost'
flush privileges;

Now all things should be up and working now.

#icinga2 #monitoring #upgrade #schema_update #icinga