This documentation page aims at explaining how to setup a YunoHost virtual server, using VirtualBox, to work on application packaging.
There are mostly two reasons why one should prefer a virtual server rather than their own server:
We will discuss VirtualBox in this guide, as it comes with an easy to use GUI. If you prefer a pure commandline approach to handling your virtual machine, you should use ynh-dev instead.
From a GNU/Linux system, simply install the
From a Windows or macOS machine, you'd have to refer to the VirtualBox download page to fetch the appropriate installation package. The virtualbox package is deprecated since Debian 9, a
.deb installation package is available on the abovementioned referenced page.
Whatever your system, there should be no need to install the extension pack or the guest addons.
During post-install, there is no need to use an actual domain name in
.noho.st, as your virtual server won't be reachable from outside your local network.
We prefer using a fake domain name which will remain associated with your local network, for instance
This domain name, not being registered with any DNS server, will be stored in the
hosts file of the computer which will need to access it. Please refer to the documentation about using a local DNS for more information.
Your virtual server is now installed. Before starting to use it, we'll see how to create a first snapshot and how to use that feature.
VirtualBox becomes even more interesting with its snapshotting feature, which allow to store the virtualized machine state and restore it quickly. We'll also see how to use multiple snapshot branches to work on different apps on the same machine.
Before starting to play with the virtual machine, now is a good time to take a first snapshot, so that we don't have to redo the full install process every time. First, stop the virtual machine.
Managing snapshots is done in the 'Snapshots' tab
Here, we're creating a first snapshot
We can now start to work on the virtual machine and create as many snapshots as desired for each milestone of our modifications.
In this example, after having validated our particular package removal works fine, we can easily get back in time by restoring the virtual machine to its previous state with the package still installed. Once the package will be fully functional, it will just be a matter of deleting the snaphots associated with this package work to get the virtual machine back to its initial state. For our next test, we will then be back to a freshly installed YunoHost serveur, without any trace of package installation.
In addition to successive snapshots, it is also possible to create a new machine state and additional snapshots from an older machine snapshot/state.
In this example, I have created two branches since my successful package installation, so as to independently test just the application removal, upgrade and backup/restore steps. I eventually got back to the virtual machine base state to start a new test on another package, without dropping my former test whatsoever. At any time, it is possible to get back to a previous snapshot simply by restoring it. The machine always start on the "Current state" state.
It is always possible to create a new snapshot, whether the machine is stopped or not. To restore a snapshot however, the machine cannot be running.
Virtual machine connection is similar to any YunoHost server connection, that is by using SSH.
Or, if the domain has not been added to the
hosts file, via its IP address.
We can now work on the virtual machine using the commandline.
To easily copy the package files or use a graphical text editor, one can also connect via SFTP using a file explorer.
It's a simple matter of using the
Note: on Windows or macOS, the file explorer does not natively support the SFTP protocol...
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