Containers on Jose Castrillo

Linux on Business

Fri, 07 Nov 2025 00:00:00 +0000

Why Linux 🐧? the question isn’t why Linux ? the real question is why not ? did you try it?

Linux is widely regarded as the best option for development, DevOps, hybrid cloud solutions, and even as a desktop for home and office environments due to its open-source nature, robust ecosystem, scalability, security, and cost-effectiveness. Its flexibility allows seamless integration across diverse platforms, from small IoT devices to large-scale cloud infrastructures, making it the backbone of modern technology stacks.

👨‍💻 Tunning your Devbox shell

Fri, 26 Jul 2024 00:00:00 +0000

Using Oh-My-Bash with Jetify Devbox: A Step-by-Step Guide

If you’re a developer working with Jetify Devbox, you might have noticed that its shell environment doesn’t always play nicely with Oh-My-Bash. By following these steps, you can customize and personalize your themes and PS1 prompt to create a more enjoyable and productive shell experience.

Step 1: Install Oh-My-Bash

First, you need to install Oh-My-Bash. You can do this by running the following command in your terminal:

Automation a Nextcloud as a Podman Container

Sun, 30 Jun 2024 00:00:00 +0000

I’ve been thinking to upgrade my Nextcloud service also switching to another alternative rather than docker, hence I used podman and buildah in my solution.

From the rockylinux.org I found a nice post where it describes how to build and provisioning by using buildah and podman, it works pretty good and I added a tool in order to run it faster, called taskfile.

Requirements:

Podman
Buildah
Taskfile

Install taskfile
Clone my project
From the project you can see the task defined:

version: "3"

tasks:
  up-db:
    dir: "db/mariadb"
    preconditions:
      - test -f db-init.sh
    cmds:
      - bash db-init.sh

  create-app:
    dir: "app"
    preconditions:
      - test -f run.sh
    cmds:
      - mkdir nc nc/nextcloud nc/apps nc/config nc/data
      - task: up-db
      - bash run.sh

  build_base:
    dir: "db/base"
    preconditions:
      - test -f build.sh
    cmds:
      - bash build.sh

  build_tools:
    dir: "db/db-tools"
    preconditions:
      - test -f build.sh
    cmds:
      - bash build.sh

  build_maria:
    dir: "db/mariadb"
    preconditions:
      - test -f build.sh
    cmds:
      - bash build.sh

  build_db:
    cmds:
      - task: build_base
      - task: build_tools
      - task: build_maria

  up-app:
    cmds:
      - podman container start nextcloud

Main task to build and run nextcloud:

Faster and simple maintenance page

Sun, 04 Feb 2024 00:00:00 +0000

Working on different platform either to update, patch, etc need to be notificate for those people that consume that services, it shouldn’t change if that service it’s internal, you must notificate your teams about it.

When you’re into your maintenance window you can use a faster way to broadcast everyone you’re working on it; I use this simple solution when I was working into a Jenkins migration, hence I stop the jenkins service and instead of 500 html error I developed a simple html text exposing it by a nginx container by the root path.

Upgrading major version Nextcloud

Sat, 20 May 2023 00:00:00 +0000

For those who have been facing the “Maintenance mode active” after applied a nextcloud upgrade by switching container image version, due a major versioning issue.

Even when you issue the occ upgrade into continer you gets hit by something like below:


www-data@87401bdd2fa8:~/html$ php /var/www/html/occ upgrade
Nextcloud or one of the apps require upgrade - only a limited number of commands are available
You may use your browser or the occ upgrade command to do the upgrade
Setting log level to debug
Exception: Updates between multiple major versions and downgrades are unsupported.
Update failed
Maintenance mode is kept active
Resetting log level

Keep a eye on this part: Updates between multiple major versions and downgrades are unsupported. as I was running 25 version I can no jump for above 27, if that’s our case, we can edit the file app/config/config.php edit the version of your nextcloud like below:

Python & Virtual Environments

Wed, 15 Mar 2023 00:00:00 +0000

When starting a Python 3 project in Linux, it’s essential to follow best practices to ensure a clean and isolated development environment. One of the recommended approaches is to utilize virtual environments. Virtual environments allow you to create an isolated environment for each project, preventing conflicts between different packages and dependencies. In this guide, we’ll walk you through the steps to set up and activate a virtual environment for your Python 3 project.

csi interface for eks by terraform

Tue, 10 May 2022 00:00:00 +0000

It has been a while since my last post, I was busy these last couples of weeks; meanwhile I’ve learned how to implement a csi interface on eks (aws k8s) and it’s pretty interesting on AWS by EKS service, thus I though it can be useful this content into a post.

Requirements:

You will need your eks already running.

I’ll point each tools, techs, etc I used on this procedure:

How setup a Gitlab Runner (CI)

Wed, 08 Dec 2021 00:00:00 +0000

Part I -

I’m learning Gitlab Runner and how them works on CI implementation.

GitLab Runner is an application that works with GitLab CI to run jobs in a pipeline, they are written in GO

Summary the task I will do:

Install Gitlab-runner as container(podman).
Runner registration.
- Enter the GitLab instance URL
- registration token.
- runner description.
- tags.
- Select an executor.
Create a gitlab-ci.yml

Install runner:

Create the Volume:

podman volume create gitlab-runner-config

Pull and start the container by register command, then we will prompt the data need for register the runner into the project.

Install Hetzner-CLi on Fedora by Toolbox

Sun, 04 Jul 2021 00:00:00 +0000

On this new entry I will share a briefly installation step by step by using Toolbox at Fedora 34 to use the hcloud-cli. Due we do not have an official package on fedora git-repo yet, hence we can create this container.

Pre-requirement:

Visit Hetzner Cloud Console at https://console.hetzner.cloud, select your project, and create a new API Token.

Let’s start:

1- Create a file named Dockerfile.debian with the following contents(the following image is made to use a script to named and set a token_key):

How to install /e/OS in Gigaset GS290 from GNU/Linux

Sun, 21 Mar 2021 00:00:00 +0000

I created this post as aim to collaborate with the project and help those how are bought a Gigaset GS290 to test this great /e/ OS degoogle fork, and have been failed by using easy installer, but first I will let clearly that these steps are the steps I followed in order to set up the /e/ OS in my Gigaset.

Requirement-system:

GNU/Linux OS (in my case Fedora).**
ADB & Fastboot library latest.**
/e/OS build**
boot.img**
recovery.img**
Basic knowledge in terminal & command line.
Sudo

Requirement-smartphone:

Monitoring with Cockpit

Mon, 11 Jan 2021 00:00:00 +0000

On this post we are going to talk about cockpit how to monitoring and manage your GNU/Linux infrastructure. Based on the official description, Cockpit project is pretty easy to use, install and integrate, you can manage and add servers by ssh credentials to your dashboard, showing logs, monitoring containers(podman/docker), services running, disk usage, etc.

I’ve using it around 1 year, the only thing I cannot see it’s an alert tool or event trigger, maybe for the next release; is developed by RH team and open source, it’s already integrated in some of the GNU/Linux distribution ( RH, debian, ubuntu, fedora, etc).

Open a Nextcloud's DB through a ssh connection

Mon, 23 Nov 2020 00:00:00 +0000

The following post explains how to open and connect your Nextcloud’s DB (MariaDB) by a ssh tunnel.

Field description:

Server side(GNULinux):
- Nextcloud: running on Docker-compose engine.
- OS: Debian with Docker compose installed.
- Database: MariaDB.
Localhost side(GNULinux):
- OS: Fedora.
- CLient: Dbeader 7.2.5

Further information you can go to my docker compose Statement here.

Edit your docker-compose.yml and add the “ports” key into the statement.

$ nano docker-compose.yml
  ports:
    - 5555:3306

port: 5555 –> Host.
port: 3306 –> Container.

From the above the port “5555” it was used as example.

How to deploy Wordpress + Mariadb using Docker

Sat, 08 Aug 2020 00:00:00 +0000

Below you will see the statement I used to deploy a Wordpress as db mariadb (mysql); I shared it to you, cos I’ve been looking out for a good .yml statement piece, but some of them are older or put other set frontend as nginx, etc. I did a simple and easier deployment statement, so here we have:


version: '3.3'

services:
   wordpress:
     depends_on:
       - db
     image: wordpress:latest
     volumes:
       - ./html:/var/www/html
     ports:
       - "8080:80"
     restart: always
     environment:
       WORDPRESS_DB_HOST: db:3306
       WORDPRESS_DB_USER: wordpress
       WORDPRESS_DB_PASSWORD: password
     links:
       - db
     depends_on:
       - db

   db:
     image: mariadb:10.5.4-focal
     volumes:
       - ./db_data:/var/lib/mysql
     restart: always
     environment:
       MYSQL_ROOT_PASSWORD: SECRET
       MYSQL_DATABASE: wordpress
       MYSQL_USER: wordpress
       MYSQL_PASSWORD: password
     ports:
       - "3306:3306"

You can switch the local mount to volume mount it will depend of you design.

Setup Podman service in Silverblue by Systemd

Tue, 07 Jul 2020 00:00:00 +0000

Into my Devops learning path 👨‍💻 I decided to deploy a monitoring centre into my workstation where I could be able to watch my containers, resources, logs, etc and continue improving my knowledge, in my case I’m using Silverblue developed by Fedora so in here it’s a little bit different the setup; as monitoring tool I choose Cockpit for its great integration and support.

Workstation: Silverblue 🖥️
Container engine: Podman ⚙️
Monitoring tool(app/service):Cockpit 📦

I splinted out the instructions in 4 simple parts:

Docker Container "before start"

Sun, 26 Jan 2020 00:00:00 +0000

Part I

Containers are environments that host individual applications using a framework like Docker.

Docker Editions:

Docker CE ( community edition ) free version
Docker EE ( enterprise edition) Paid

Versions:

Stable, released every 4 months.
Edge (beta) released every month. For testing
EE, support for one year.

Example how to create a container:

$docker container run --publish 80:80 --detach --name webhost nginx

detach: subcommand is to let run the container and keep use the command prompt name: create a container’s name.

How to create a docker-compose.service

Sun, 08 Sep 2019 00:00:00 +0000

Here are the steps I made to set a service into my Fedora server to start/stop my Docker-compose (Wikijs)

Why I decided to use a docker-compose into a Linux VM machine? —> for make it more stable, faster,portable, isolated, etc.

First I stared using Docker for Windows and it was a little bit unstable and not quite easy to handled, so when I switched to Docker compose into a Fedora VM and in that point it was a huge different(I do not recommend to use Docker in Windows); I use a Vmware hypervisor ( in the office we use it ).

Backup your Wikijs DB

Mon, 15 Jul 2019 00:00:00 +0000

This is a little resume of how I’m doing a backup procedure of my wikijs database based in Docker-compose.

Below are the systems used in my enviroment:

Project: Wikijs 2.0 Beta
Platform: Docker-Compose
DB: Postgres (9.6.14)
Server: Fedora Server 30.x86_64
Workstation: Windows 10 (provided by work) 😬

PSQL basic commands:

Here are 4 basic commands I use to connect into my Postgre DB and check out DB list and quite.

$psql -h localhost -p 5416 -U <my-user> -d <my-database>

Disable live-restore to run Docker Swarm

Thu, 28 Mar 2019 00:00:00 +0000

The following instruction is a solution when you got an error response with live-restore using Docker Swarm in Fedora 28 or highter

$ docker swarm init
Error response from daemon: --live-restore daemon configuration is incompatible with swarm mode

That’s not possible to enable Live-restore and Swarm-mode together.

First make sure that the SElinux is Permissive or Disabled.

$ sestatus

SELinux status:                 enabled
SELinuxfs mount:                /sys/fs/selinux
SELinux root directory:         /etc/selinux
Loaded policy name:             targeted
Current mode:                   permissive
Mode from config file:          enforcing
Policy MLS status:              enabled
Policy deny_unknown status:     allowed
Memory protection checking:     actual (secure)
Max kernel policy version:      31

Then remove the –live-restore line from the /etc/sysconfig/docker

Pulling Mysql using Docker Hub into Linux workstation

Thu, 28 Mar 2019 00:00:00 +0000

$ systemctl start docker
$ systemctl status docker
$ docker pull mysql
$ docker image ls
$ docker run --name db -e MYSQL_ROOT_PASSWORD=mysql123 -d mysql

Use the docker exec -it command to start a mysql client inside the Docker container you have started, like the following:

$ docker exec -it db mysql -uroot -p

Enable "Kubectl" auto-completion in the Shell (Linux)

Sun, 25 Nov 2018 00:00:00 +0000

When you’ve done the SDK installation in your Linux workstation. list the components you have installed, then you will see the full list additional components from gcp SDK:

gcloud components list
gcloud components install <COMPONENT_ID>
gcloud components install kubectl

Then follow the instruction from the kubernetes official documentation, check the “bash-completion” and finally issue the command below:

echo "source <(kubectl completion bash)" >> ~/.bashrc

Even you can go directly through your .bashrc (sudo) to add manually, it should look like: