If you want to create an SSL certificate for multiple subdomains, you could either use a wildcard certificate like *.example.com or you could use an SSL certificate with SubjectAlternativeName (SAN). For example, if you create an SSL certificate with SubjectAlternativeName (SAN) like this: CN: gitlab.example.com SAN: registry.example.com, mattermost.example.com In my understanding it was one main […]
I think we all know, and hopefully love Git. Git is very powerful and even so, a lot of people (including myself) haven’t experienced the full power of Git. I for myself haven’t used reflog or even heard about it for a long time. However, reflogs can probably become really important.
We all know Docker, right? Running processes in Docker containers is nice and we can easily stop, start or restart the container with simple commands. However, you probably don’t want to “fully restart” a container all the time so sending signals to a Docker container becomes important.
When it comes to databases running in Docker containers then a consistent backup of the data with classic backup methods becomes a bit tricky. So you’ve to use a quite different approach to backup a MySQL or MariaDB Docker container.
When it comes to (simple) web applications, then most of the time Docker is a perfect fit. However, as you begin to migrate your applications into Docker containers, you might ask yourself how to forward all the requests to the different containers. A Docker Reverse Proxy can help!
While most Linux Kernels nowadays come with nice sysctl defaults, there’s always room for improvement. Some parameters can be used for performance tuning, others can be critical for security hardening. What is sysctl? sysctl is an interface to view and dynamically change parameters in Linux and other *NIX operating systems. In Linux, most of the dynamic Kernel settings can be […]
TCP is the abbreviation for Transmission Control Protocol. It is one of the core protocols in the internet protocol suite and provides a reliable protocol to communicate in computer networks. Nearly every Internet-connected device “talks” TCP and the whole Internet relies on it.
With lazytime, the Linux Kernel 4.0 brings a new feature which lazy updates the file timestamps on the disk.
A while ago, Docker announced that Docker pull requests from version 1.5 and earlier clients will no longer function as of December 15. While push requests have been disabled since Nov 19, pull requests were disabled for the Docker Hub today as well.
In the Ansible Core are a lot of Ansible modules included for almost all use cases. On this page are all modules listed and described with the available options and some examples. Some Ansible modules are on the first view quite similar and can be used for the same purpose, but often are there some crucial […]