Using multipath together with mdadm on Debian
Using multipath together with mdadm on Debian Linux requires some changes to the initrd image, otherwise mdadm might…
Use multiple Azure subscriptions in Terraform modules
Due to billing or organizational structures, certain parts of the infrastructure could be divided over several Azure subscriptions.…
Read the HAProxy UNIX socket file using Perl
HAProxy provides a socket file which can be used to do maintenance (enable/ disable backends, retrieve information and…
A Prometheus Exporter framework written in Perl
I released a small project I wrote a while ago, to create quick Prometheus exporters in Perl for…
Managing LDAP passwords with Perl
OpenLDAP Software is an open source implementation of the Lightweight Directory Access Protocol. Many graphical interfaces are available…
Libvirt guest startup issue with AppArmor
With AppArmor enabled on Debian/ Ubuntu systems, starting up virtual machines with libvirt can cause startup failures if…
Deploy a PostgreSQL database with an initial schema using Ansible
Ansible is a great automation tool to manage operating systems, but also to manage database like PostgreSQL. Many…
Using Ansible to finalize Hashicorp Packer images
Ansible provides a more flexible way to fine-tune Hashicorp Packer images compared to cloud-init. Playbooks can be executed…
Perl script to monitor the rate of logs
In a previous article (IPTables Logging in JSON with NFLOG and ulogd2) we learned how to log certain…
Import configuration from Hiera or a Git repository with YAML files into Terraform
De-duplication of configuration information is key when managing large environments which use different types of automation (Terraform, Jenkins,…