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Provision an on-prems Kubernetes Cluster with Rancher, Terraform and Ansible

Automate the provisioning of on-premises Rancher RKE Clusters and the registration of their nodes via Terraform and Ansible What is Rancher Rancher is one of the most exciting pieces of software I have come across the last decade. …

Rancher

15 min read

Jul 27

Explore the layers of a Docker image with dive

With dive, an interactive console tool written in Golang, you can explore through the different layers of a docker image. What are docker layers Every docker image contains the information of what changed in comparison to its parent image. All images have a parent one, except those that derive from scratch, a special case…

Docker Image

3 min read

Jul 17

Provision a High Availability K3S Cluster with K3D

Create a multi-node K3S Cluster on Docker containers using K3D Introduction Rancher has created its own Kubernetes distributions, RKE and K3S. RKE, is a CNCF-certified K8S distribution that runs on any host, with sole requirement a running docker engine instance. K3S on the other hand, is the lightweight alternative, that consolidates…

Kubernetes

7 min read

Provision a High Availability K3S Cluster with K3D

Jul 11

Reduce the size of Golang images with multi-stage build

How can we reduce the size of Golang images by introducing Dockerfiles with a multi-stage build process Let’s start from a generic Dockerfile that takes care of the basic staff like dependencies, building the binaries, expose the necessary ports etc. for a very basic REST API in Go. FROM golang:1.16-alpine …

Golang

4 min read

Jul 8

Build Golang Docker images with GitLab CI Pipelines

Use GitLab CI Pipelines to build Docker images for your Golang projects and to push them in Docker Hub. In this article we are going to setup a GitLab CI Pipeline from scratch for a Golang project and investigate the following topics: Assess the syntactical integrity of your code Run…

Gitlab Ci

7 min read

Published in DevOps.dev

·Jul 8

Register a GitLab Runner that uses the Docker Executor

Run your GitLab CI/CD jobs inside isolated Docker containers With GitLab Runner’s Docker executor we are able to provide a completely isolated environment for each job in the pipeline, as an isolated container. We have actually two options here: either using the so called Docker in Docker, or alternatively bind…

Gitlab Runner

2 min read

Published in DevOps.dev

·Jun 29

Store Terraform state in GitLab

Use the Terraform HTTP backend provided by GitLab to store you Terraform state in GitLab Terraform persists state data in files in order to track the status of the resources it manages. Out of the box, Terraform is utilizing a default backend, local, which stores state as a local file…

Terraform

3 min read

Published in DevOps.dev

·Jun 27

Change the URL of a GitLab Server

How to reconfigure the external URL of a GitLab server In some cases you might encounter the problem of having to reconfigure, the external URL address of an already working GitLab server. At the first sight that might look daunting, especially when important repos are involved and people are depending on this installation. However the solution is rather simple. Login to your GitLab server and locate the following file /etc/gitlab/gitlab.rb. Search for the setting external_url and set the new desired value e.g:

Gitlab

1 min read

Change the URL of a GitLab Server

How to reconfigure the external URL of a GitLab server

GitLab is an open-core company that provides GitLab, a DevOps software package that combines the ability to develop, secure, and operate software in a single application. The open source software project was created by Ukrainian developer Dmitriy Zaporozhets and Dutch developer Sytse Sijbrandij. [Wikipedia]

In some cases you might encounter the problem of having to reconfigure, the external URL address of an already working GitLab server. At the first sight that might look daunting, especially when important repos are involved and people are depending on this installation. However the solution is rather simple. Login to your GitLab server and locate the following file /etc/gitlab/gitlab.rb. Search for the setting external_url and set the new desired value e.g:

external_url 'http://gitlab.home.lab'

Save the changes, and then reconfigure and restart the GitLab instance in order to apply the changes.

sudo gitlab-ctl reconfiguresudo gitlab-ctl restart

Access your server from the new URL and you will notice that everything now runs under the new configuration.

Jun 21

FailedMount— Initialisation failure for Persistent Volumes on Rancher with OpenEBS

A simple solution to overcome the PV initialisation failure that leaves pods in a ContainerCreating state when using openebs-hostpath Storage Class in Rancher Installing OpenEBS on Rancher is an uncomplicated matter that will not take you more than 3–5 minutes. Soon enough though, you will be struck with a bit…

Rancher

3 min read

May 30

Load Balancing with MetalLB on bare metal Kubernetes

Set up a MetalLB Load Balancer on a bare metal Kubernetes Cluster Introduction Kubernetes offers the following service types: ClusterIP: provides a load-balanced IP address for one or more pods that match a label selector and forwards requests to this IP address. Consequently that is a service that is accessible only…

Kubernetes

6 min read

Provision an on-prems Kubernetes Cluster with Rancher, Terraform and Ansible

Explore the layers of a Docker image with dive

Provision a High Availability K3S Cluster with K3D

Reduce the size of Golang images with multi-stage build

Build Golang Docker images with GitLab CI Pipelines

Register a GitLab Runner that uses the Docker Executor

Store Terraform state in GitLab

Change the URL of a GitLab Server

Change the URL of a GitLab Server

FailedMount— Initialisation failure for Persistent Volumes on Rancher with OpenEBS

Load Balancing with MetalLB on bare metal Kubernetes

Akriotis Kyriakos