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Container

Service accounts in kubernetes 1.24

Service accounts in kubernetes 1.24

Kubernetes 1.24 changed the way serviceaccounttokens are presented by default on the cluster itself. If you need to retrieve the token, you mostly use a secret for this. This guide shows how to do this in kubernetes >= 1.24.

Daniel Nachtrub
Daniel Nachtrub
Container
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
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