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Linux

ceph reports "n hosts fail cephadm check"

ceph reports "n hosts fail cephadm check"

One of our ceph clusters entered HEALTH_WARN state with reason "1 hosts fail cephadm check". This guide shows a quick tip how to find out more about this issue.

Daniel Nachtrub
Daniel Nachtrub
Linux
sudo root shell with autocomplete

sudo root shell with autocomplete

Switching user using sudo results in a limited shell without command completion. Using the right sudo command omits this limit and provides a fully fledged shell.

Daniel Nachtrub
Daniel Nachtrub
Linux
Change BIOSGUID in Hyper-V machines

Change BIOSGUID in Hyper-V machines

Using templated virtual machines on hyper-v comes with some issues if you need to ensure that each VM has a unique identity. This guide will show how you'll assign a unique identity for linux VMs.

Daniel Nachtrub
Daniel Nachtrub
Linux
Migrating zabbix from mysql to timescaledb - introduction

Migrating zabbix from mysql to timescaledb - introduction

Depending on the size of your zabbix environment, you might want to migrate from mysql to timescaledb. This guide will show how this can be done.

Daniel Nachtrub
Daniel Nachtrub
Monitoring
Reducing ceph filesystem overhead on virtual systems

Reducing ceph filesystem overhead on virtual systems

Running ceph clusters with cephfs may allocate more disk space than you expect - especially on virtualized environments. This guide might provide a solution for that.

Daniel Nachtrub
Daniel Nachtrub
Linux
Using AzureCli with command completion on windows

Using AzureCli with command completion on windows

If you're working with azure you're propably also working with AzureCli. This article shows how to get usable command completion on your client.

Daniel Nachtrub
Daniel Nachtrub
Azure
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