Administrations

Install portainer on ubuntu 16 docker

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Step 1 – Install Docker on Ubuntu 16.04 LTS
Before installing docker packages, please update the repository on your system and upgrade packages.

sudo apt update
sudo apt upgrade

Now install docker using the apt command below.

sudo apt install docker.io -y

After the installation is complete, start docker service and enable it to launch everytime at system boot.

systemctl start docker
systemctl enable docker

Docker installed on ubuntu 16.04 server, check it using the command below.

docker version

And you will get the docker version 1.x installed on the system.

Step 2 – Install and Configure Portainer
Portainer can be installed as a docker container and standalone without docker container.

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Sharing Volumes Between Containers

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There are many situations where it is useful to share a Docker volume between containers, and several ways to accomplish this goal.

Sharing a Volume on the Host

If you create a volume on the host machine, it can be used by multiple different containers at once. This allows you to share data between containers and the host.

For this example we will create a directory on the host, and use that directory as a shared volume between two containers.

Begin by creating a directory to use as a Docker volume with the command:

sudo mkdir /webdata

Create a small test file in this directory with the command:

sudo echo "Hello from the host." >> /webdata/host-hello.txt

Next, launch a container named sql-database from the official PostgreSQL image, and map /webdata on the host to /data on the container with the command:

sudo docker run -it --name sql-database -v /webdata:/data postgres /bin/bash

Once you are at the new container’s command prompt verify that the shared volume is set up correctly with the command:

ls /data

You will see the host-hello.txt file which we created on the host. Let’s add a file to this shared volume with the command:

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Reclaim disk space from a sparse image file qcow2/ vmdk

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Sparse disk image formats such as qcow2 only consume the physical disk space which they need. For example, if a guest is given a qcow2 image with a size of 100GB but has only written to 10GB then only 10GB of physical disk space will be used. There is some slight overhead associated, so the above example may not be strictly true, but you get the idea.

Sparse disk image files allow you to over allocate virtual disk space – this means that you could allocate 5 virtual machines 100GB of disk space, even if you only have 300GB of physical disk space. If all the guests need 100% of their 100GB disk space then you will have a problem. If you use over allocation of disk space you will need to monitor the physical disk usage very carefully.

There is another problem with sparse disk formats, they don’t automatically shrink. Let’s say you fill 100GB of a sparse disk (we know this will roughly consume 100GB of physical disk space) and then delete some files so that you are only using 50GB. The physical disk space used should be 50GB, right? Wrong. Because the disk image doesn’t shrink, it will always be 100GB on the file system even if the guest is now using less. The below steps will detail how to get round this issue.

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Install Jitsi Meet and configure load balancing

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Jitsi Meet is an open-source (Apache) WebRTC JavaScript application that uses Jitsi Videobridge to provide high quality, secure and scalable video conferences. It can be used as a replacement for proprietary services like Zoom, Whereby, Teams, Skype and many others.

Requirements

  • At least two Linux systems with Debian 10
  • DNS Record for your domain (in our case meet.example.com)

Prepare your system
First of all we prepare our system by updating all package lists and packages. To do so run the following commands.

apt update && apt upgrade -y

Basic Jitsi Meet installation
Next, please be sure that your FQDN is configured correct.

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Enable authentication of Jitsi Meet

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A basic installation of Jitsi Meet gets you up and running within shortest time, probably in less than 15 minutes. There are hardly any configuration changes necessary. Most important information is a fully qualified domain name (FQDN), and that’s it.

However such a default installation of Jitsi Meet is open. Meaning, that anyone knowing the URL of your server can create a new meeting room and start to have video conferences using your instance and probably causing additional cost.

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Installing Jitsi and Jibri on Same Machine

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This post is heavily inspired from this community post by https://community.jitsi.org/u/Woodworker_Life. However, the original installation document is based on typical split Jitsi on one VM and Jibri on seperate VM. 

A little reworked version is deployed and tested for several client based with no performance issue- this post covers a single VM with Jitsi Videobridge and Jibri Reocording system.

Prerequisites:

  • Works only on Ubuntu 16 Distribution
  • Only following DNS entries are needed to be available:
    • meet.ensii.net -> 123.45.67.89
    • recording.ensii.net-> 123.45.67.89
    • recorder.ensii.net-> 123.45.67.89
  • update /etc/hosts file as following:
    • 127.0.0.1    meet.ensii.net
      123.45.67.89    recording.ensii.net
      123.45.67.89    recorder.ensii.net

Part-1: Setup Jitsi Meet on the server

You will need to login to the server you created in step 1. For this, on my Windows laptop, I use PuTTy. Login with initial password and change it to your own.

Update server:

apt update && apt upgrade -y

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Install h5ai – file indexer on Centos 7

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H5ai is a modern file indexer for HTTP web servers with focus on your files. Directories are displayed in a appealing way and browsing them is enhanced by different views, a breadcrumb and a tree overview. Initially h5ai was an acronym for HTML5 Apache Index but now it supports other web servers too.

Step 1 – Installing (Requires PHP 5.5+)

wget https://release.larsjung.de/h5ai/h5ai-0.29.2.zip
unzip h5ai-0.29.2.zip

Copy folder _h5ai to the document root directory of the web server: DOC_ROOT/_h5ai.

DOC_ROOT
 ├─ _h5ai
 ├─ your files
 └─ and folders

Add /_h5ai/public/inde to http conf file

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Proxmox Cloud-Init OS template creation

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Introduction

In this guide we will go over creating a Proxmox KVM Template from a Cloud Image. This same process will work for any Cloud-Init Openstack based image type you can find online.

Having done a number of these for our Proxmox based VPS service I wanted to post up a guide to help anyone else looking to do the same thing.

My workflow for customizing one of those for use with Proxmox with cloud-init deployment from WHMCS and root login is below. Once you setup one template you can rapidly reinstall new containers and test stuff.

Setup Environment

If not installed already installed you will need libguestfs-tools :

apt-get install libguestfs-tools

To edit the image before importing. We will use virt-edit which is a part of libguestfs-tools.

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Apache error fix on Forbidden You don’t have permission to access this resource

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Tested and works on Debian/Ubuntu apache installation. For this open the apache2.conf file using the nano editor

sudo nano /etc/apache2/apache2.conf

Replace the general directory settings with this.

<Directory />
#Options FollowSymLinks
Options Indexes FollowSymLinks Includes ExecCGI
AllowOverride All
Order deny,allow
Require all granted
</Directory><Directory /usr/share>
AllowOverride None
Require all granted
</Directory><Directory /var/www/>
Options Indexes FollowSymLinks
AllowOverride None
Require all granted
</Directory>
#<Directory /srv/>
# Options Indexes FollowSymLinks
# AllowOverride None
# Require all granted
#</Directory>

Ensure your virtual host configuration file in /etc/apache2/sites-available directory is in this manner

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