firewall

In the spirit of “this took me way too long”, here’s how to boot an instance with a CD-ROM on OpenStack, using Terraform. Why would I need this? In a perfect world, I have templates to bootstrap instances. Means, the instances are ready to go when booted. I customise them with cloud-init and let them do all kinds of cool (or necessary) stuff like configuring the network, setting hostnames, adding user accounts and then maybe joining them to a cluster....

As I am spiralling into Linux server administration, there’s certainly a lot to learn. Certainly a lot leaves me wanting BSD, but since that’s not an option, … here we go. NetworkManager The NetworkManager on Linux (or CentOS specially) manages the network. Whatever content/blog posts/knowledge base I found. It usually suggests that you uninstall it first. Common problems are that people are unable to manage /etc/resolv.conf — because changes made by them to that file get overwritten again....