Install Jitsi on Debian 11

This article will go through the installation and configuration of the Jitsi Video Conference on the latest Debian 11 Bullseye. At the end of this guide, you will be able to create a meeting using the Jitsi Video conference.

Before you get started, ensure you’ve got the following requirements:

  • Operating System: Debian 11 Bullseye
  • Root privileges

Install Packages Dependencies

The first step is to install some packages dependencies such as gnupg2, nginx-full, sudo, apt-transport-https, curl, and java OpenJDK.

1. Update your Debian repository and install those packages on top using the following command.

sudo apt install apt-transport-https gnupg2 nginx-full sudo curl -y

2. Jitsi required Java OpenJDK version 1.8 or 1.11; the default Debian repository provides Java OpenJDK 1.11.

Now execute the following command to install Java OpenJDK packages.

sudo apt install default-jdk -y

After installation completes, verify the Java OpenJDK version using the following command.

java -version

You will see a similar output as below.

openjdk version "11.0.13" 2021-10-19
OpenJDK Runtime Environment (build 11.0.13+8-post-Debian-1deb11u1)
OpenJDK 64-Bit Server VM (build 11.0.13+8-post-Debian-1deb11u1, mixed mode, sharing)

After all packages have been installed, move on to setting up Jitsi and Prosody repositories.

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Nextcloud Upgrade Issue via Web

My Nextcloud update via web was constantly failing. So looked for alternate CLI methods.

Method#1 Using occ cli

sudo -u www-data php ./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
Set log level to debug
Updating database schema
Updated database
Updating <files_pdfviewer> ...
Updated <files_pdfviewer> to 1.1.1
Updating <gallery> ...
Updated <gallery> to 17.0.0
Updating <activity> ...
Updated <activity> to 2.5.2
Updating <comments> ...
Updated <comments> to 1.2.0
Updating <theming> ...
Updated <theming> to 1.3.0
Starting code integrity check...
Finished code integrity check
Update successful
Maintenance mode is kept active
Reset log level

Method#1 Using updater.phar

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Restore ZFS Pool and storage data

If the disks are recognized from your OS the command:

zpool import

should be enough to get the pool imported and visible in your current OS. You can check the status with command

zpool status

You can try to import it explicitly by name

zpool import ZStore

P.S. Do not forget to set the pool online:

zpool online

You can check zpool-features features and if they are enabled or not in your case. Seems like zfs build in your case is new than the version which create it. The problem is if you update you will be able to mount only with same or upper version of zfs

What I can recommend you is to try (if available) with live version (but this with which you create the pool)



Create a RAID array using with mdadm

mdadm (multiple devices admin) is an extremely useful tool for running RAID systems. It’s is a tool for creating, managing, and monitoring RAID devices using the md driver. It can be used as a replacement for the raidtools, or as a supplement. You can use whole disks (/dev/sdb, /dev/sdc) or individual partitions (/dev/sdb1, /dev/sdc1) as a component of an array.

The benefits of using mdadm are:

  1. mdadm can diagnose, monitor and gather detailed information about your arrays.
  2. mdadm is a single centralized program and not a collection of disperse programs, so there’s a common syntax for every RAID management command.
  3. mdadm can perform almost all of its functions without having a configuration file and does not use one by default.

mdadm software tools work for all Linux distributions, with the same syntax.

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Install Discourse on Ubuntu 22.04


  • A server with Ubuntu 22.04 as OS
  • Valid domain pointed to the servers IP address
  • User privileges: root or non-root user with sudo privileges

Step 1. Update the System

Update the packages to their latest versions available after a fresh install of Ubuntu 22.04

sudo apt-get update -y && sudo apt-get upgrade -y

Step 2. Install Docker

First, we will add the GPG keys and Docker repository since it is not added by default in the Ubuntu 22.04 official repository.

curl -fsSL | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] focal stable"

Once the keys and repo are added, install Docker with the following command:

sudo apt install docker-ce docker-ce-cli -y

After successful installation, start and enable the Docker service.

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Troubleshoot email on a new Discourse install

If you’ve just installed discourse, but email doesn’t seem to work. Unfortunately this means you can’t log in as an admin to finalize the install. 

Try the doctor

cd /var/discourse

It will check several ways that your mail configuration might be broken, and offer advice. Try that first.

Did you enter email settings correctly?

The simplest way is to run ./discourse-setup again. Did you enter everything correctly?

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Install Nginx Proxy Manager on CentOS 7

Nginx Proxy Manager is built on docker container. So, we need to deploy Docker first.

Update Docker Package Database. In a terminal window, type:

sudo yum check-update

Allow the operation to complete.

Remove if any docker is preinstalled with your OS-

sudo yum remove docker docker-client docker-client-latest docker-common docker-latest docker-latest-logrotate docker-logrotate docker-selinux docker-engine-selinux docker-engine

Install the Dependencies

Type in the following command:

sudo yum install -y yum-utils device-mapper-persistent-data lvm2

The –y switch indicates to the yum installer to answer “yes” to any prompts that may come up. The yum-utils switch adds the yum-config-manager. Docker uses a device mapper storage driver, and the device-mapper-persistent-data and lvm2 packages are required for it to run correctly.

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SSH to use two-factor authentication using Google Authenticator on Debian or Ubuntu Server

  • A computer running Ubuntu 16.04 LTS or above
  • A phone running Android or iOS
  • A configured SSH connection
  • You should understand the danger of stolen passwords.
  • You don’t need to know what two-factor authentication is and how it works. 🙂

Installing and configuring required packages

Start a terminal session and type:

sudo apt install libpam-google-authenticator

Configuring SSH

To make SSH use the Google Authenticator PAM module, add the following line to the /etc/pam.d/sshd file:

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Deploy a Laravel app on Oracle Cloud with database


  • Ubuntu 22
  • PHP 7.3
  • Laravel 5.5
  • Apache 2
  • PHP-Redis
  • Download the public and private keys on your local machine.
  • You have created your VM instance!
  • Create an always free Autonomous Database [if your application uses a database]
  • Select your desired database
  • After creating your database, go to “DB Connection” tab
  • Download the Oracle Wallet on your local machine to connect to your database

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