Started working on upgrade notes to 7.0.x

upgrade_6.0.x_to_7.0.x.md

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+# Walkthrough ist work in progress, don't use by now
+
+# Zabbix Upgrade v6.0.x to v7.0.x (Debian 12, PostgreSQL, TimescaleDB)
+
+Make sure to make a backup of the server(s) before you proceed.
+
+## Upgrade Debian OS
+
+Make sure to make a upgrade to Debian 12 before upgrading.
+
+## Upgrade TimescaleDB
+
+### Install new timescaledb version
+
+```
+apt install timescaledb-2-2.6.0-postgresql-12
+```
+
+### Connect to Postgresql
+
+```
+sudo -u postgres psql -X
+```
+
+### Switch to database zabbix
+
+```
+\c zabbix
+```
+
+### Update the postgresql extension
+
+```
+ALTER EXTENSION timescaledb UPDATE;
+```
+
+### Verify that the new timescaledb version is used
+
+```
+\dx timescaledb
+```
+
+## Upgrade PostgreSQL to 14
+
+### Install Postgresql 14 
+
+```
+apt install postgresql-14
+```
+
+### Install Timescaledb
+
+```
+apt install timescaledb-2-2.6.0-postgresql-14
+```
+
+### Stop all postgresql clusters
+
+```
+service postgresql@12-main stop
+```
+```
+service postgresql@14-main stop
+```
+
+### Drop the new postgresql cluster
+
+```
+pg_dropcluster 14 main
+```
+
+### Run pg_upgradecluster to upgrade the cluster to v14
+
+```
+pg_upgradecluster -v 14 --method=upgrade --link 12 main
+```
+
+### Make sure the new cluster ist listening on port 5432 
+
+```
+netstat -tapen | grep LISTEN
+```
+
+### Drop the old postgresql cluster
+
+```
+pg_dropcluster 12 main
+```
+
+### Verify they timescaledb version on the zabbix db
+
+```
+sudo -u postgres psql
+```
+```
+\c zabbix
+```
+```
+\dx
+```
+
+## Upgrade Zabbix from 5.4.x to 6.0 (Steps for Debian 10)
+
+### Remove the old repository list
+
+```
+rm -Rf /etc/apt/sources.list.d/zabbix.list
+```
+
+### Install the new repository list
+
+```
+wget https://repo.zabbix.com/zabbix/6.0/debian/pool/main/z/zabbix-release/zabbix-release_6.0-1+debian10_all.deb
+```
+```
+dpkg -i zabbix-release_6.0-1+debian10_all.deb
+```
+
+### Update the repository cache
+
+```
+apt clean
+```
+```
+apt update
+```
+
+### Verify that zabbix will be upgraded to v6
+
+```
+apt list --upgradeable
+```
+
+### Install all upgrades
+
+```
+apt upgrade
+```
+
+### Start zabbix Server
+
+```
+service zabbix-server start
+```
+
+### Check the log file for errors
+
+```
+vim /var/log/zabbix/zabbix_server.log
+```
+
+### Verify the web interface is up and running
+
+## Enjoy using Zabbix :-)