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Virtualization

Virtualization gives customers the possiblity to execute their own applications. Usage of containers allows to isolate the applications and the entire OS images from the other processes which are running on a host system.

This tutorial shows how to get started with it using LXC container.

Prerequisites

NetModule Router NB2800

Configuration

Download the container
Open GUI and go to System → Virtualization
Click + to add container
By settings, choose type, create a description and select storage. Root file system will be set automatically
If you want to enable networking, go to “Networking”, select routed or bridged by the Network Interface and press Apply
You should see a following screen (if you chose extended storage, the path will have storage1 instead of storage0: /mnt/storage1/lxc/guest0)
Transfer the downloader container (you can use WinSCP) to the router and put in /mnt/storage0/lxc
Unpack the container:
```
 tar –xvf jessie.tar –C ./guest0 
```
Check access rights using
```
 ls –l 
```
If the created folder has rights 644, change them* to 755:
```
 chmod 755 -R guest0 
```
The extracted container contains rootfs directory. You need to copy the content of it to the specified root file system. Using
```
 cd 
```
, go to guest0/lxc/jessie
Type
```
 lxc-start –n guest0 
```

Information about container can be accesed by typing

 lxc-info –n guest0 <code> {{ :app-notes:info.png |}}
  - Now you can attach to the container by typing <code> lxc-attach –n guest0

* Later you should remove executable permission bits from some system files, start container in foreground mode

 lxc-start –F –n guest0

to get more Information

Installing nano/vim editor

By default, no text editor is installed. I recommend installing two most popular editors, namely vim and nano.

Being attached to the container (root@jessie:~# displayed in the left corner of the CLI), type

 apt-get install <name>

,where <name> is either 'vim' or 'nano'.

When a line similar to the following appears: After this operation, 27.9 MB of additional disk space will be used. Do you want to continue? [Y/n], type 'y' and confirm by pressing enter.

Hello World in C

First of all we need to install gcc: GNU Compiler Collection
At the beginning, update the packages by typing
```
 apt-get update 
```
Subsequently install the compiler by typing
```
 apt-get install gcc 
```
Now create and open a .c file using nano editor
```
 nano hello.c 
```

Type following code:

hello.c

#include <stdio.h> 
int main() 
{
	printf("Hello World");
	return 0; 
}

Save it using Ctrl + O (German keyboard: Strg + O)
Exit using Ctrl + X (German keyboard: Strg + X)
Compile the program using gcc
```
 gcc hello.c -o hello 
```
Type
```
 ls -l 
```
The created file has rights 644. Change it to 755
```
 chmod 755 hello 
```
Type
```
 ./hello 
```
to run the program

Hello World shell script

Create and open file using nano editor
```
 nano helloBash 
```
Type following code:
helloBash
```
#!/bin/bash
echo "Hello World"
```
Save it using Ctrl + O (German keyboard: Strg + O)
Exit using Ctrl + X (German keyboard: Strg + X)
Type
```
 ls -l 
```
The created file has rights 644. Change it to 755
```
 chmod 755 helloBash 
```
Type
```
 ./helloBash 
```
to run the program

Hello World in Python

First of all we need to install Python
At the beginning, update the packages by typing
```
 apt-get update 
```
Subsequently install Python by typing
```
 apt-get install python 
```
Create and open a .py file using nano editor
```
 nano helloPt.py 
```
Type following code:
helloPt.py
```
 print "Hello World" 
```
Save it using Ctrl + O (German keyboard: Strg + O)
Exit using Ctrl + X (German keyboard: Strg + X)
Run the program using
```
 python helloPt.py 
```

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