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Docker

Migrating zabbix from mysql to timescaledb - migration

Migrating zabbix from mysql to timescaledb - migration

This series describes how to migrate a mysql database to timescaledb - use case is to migrate a zabbix application database. This part handles the migration and switchover of the server environment up to completion of the migration.

Daniel Nachtrub
Daniel Nachtrub
Database
Rocketchat fails after upgrade with index error

Rocketchat fails after upgrade with index error

Upgrading rocketchat to version 5.0 resulted in some minor issues that prevented the system from starting - both are related to the database and can easily be fixed.

Daniel Nachtrub
Daniel Nachtrub
Container
upgrade postgres with timescaledb

upgrade postgres with timescaledb

Upgrading postgres can be a challenging task, because databases are mostly in use. Having extensions like timescaledb introduces even more complexity. This guide shows a fast way to upgrade a postgres database with timescaledb.

Daniel Nachtrub
Daniel Nachtrub
Linux
Migrating zabbix from mysql to timescaledb - setting up environment

Migrating zabbix from mysql to timescaledb - setting up environment

This series covers migrating a zabbix database from mysql to timescaledb. In this post we're preparing the databases for the migration.

Daniel Nachtrub
Daniel Nachtrub
Container
docker swarm - preserve client ip on incoming connections

docker swarm - preserve client ip on incoming connections

Running services in docker swarm utilizes the docker swarm routing mesh which results in source nat (snat). If you need to bypass this, check out this guide.

Daniel Nachtrub
Daniel Nachtrub
Container
docker daemon not starting after upgrade

docker daemon not starting after upgrade

Having upgraded docker you may come into a situation where the docker daemon itself doesn't start anymore because of an issue with firewalld.

Daniel Nachtrub
Daniel Nachtrub
Container
Docker - Hardening with firewalld

Docker - Hardening with firewalld

Containers are no virtual machines - yet we might want to treat hosts running container workloads like hypervisors and apply limitations on container networking. This guide describes a way to limit container networking on docker based container hosts using firewalld.

Daniel Nachtrub
Daniel Nachtrub
Linux