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Self-hosted GitLab instance for DevOps on Ubuntu 18.04
GitLab provides a great number of tools needed for the DevOps cycle of an application. In this guide, we'll install a GitLab instance on our own server and configure it to fit our DevOps needs. Here, we will use a fresh install of Ubuntu 18.04 as a base.
Generic Kubernetes manifest for web application deployment
Deployment name, container registry and service port are externalized, making this manifest general-purpose
Self hosted Docker registry
When using the <code>docker pull</code> command, container images are by default downloaded from docker hub, the official public registry for container images. However, for some projects, images are better stored on a private platform. This can be achieved by hosting one's own docker registry.
Application containerization
Let's imagine a developer building an application on his computer and that this application is meant to be deployed on a different machine (production environment). In order to execute properly, this application requires multiple libraries, binaries and packages. For example, a Python program requires the Python interpreter as well as all the imported Python modules.
Creating a private docker registry for Kubernetes
A docker registry can be run easily using as a docker container using docker itself.
Docker HTTP (insecure) registry
By default Docker refuses to push/pull from registries that are not served using HTTPS.
Passing variables to Kubernetes manifest
When using kubectl apply, environment variables in Kubernetes manifests are not parsed. For this to happen, the envsubst command can be used.