– minionserver user tips

On this page, useful info is gathered for the usage of minion.private.ugent.be.

Server Specs

  • RAM: 64 GiB (max: 64 GiB) DDR3-1600 RDIMM
  • CPU: 12 cores – 24 threads
  • HDD: 8 TB (/home)
  • SSD: 4TB (2.8 TB system | 1.1 TB /tmp) 
  • OS: Linux Mint 20 (Ulyana)

Info on recent server usage can be found on http://www.kennybogaert.eu/servers/.

Installed Software

Additional packages:

  • MinKNOW

Login SSH

First, connect to the UGent network via VPN connection or cable.

*Windows users:

Windows users may install a free client as alternative. (https://mobaxterm.mobatek.net/)

*Linux users:

connect via ssh to minion.private.ugent.be on linux:

ssh username@minion.private.ugent.be

scripts can be run in the background using nohup

nohup command &
nohup command >/dev/null 2>&1 & # creates no nohup.out

Or when programs with a graphical user interface need to be loaded (Rstudio, CLC genomics, ..)

ssh -X username@minion.private.ugent.be 

Optional (modify your path) :

Filetransfer

A. Commandline (only UNIX):*

VIA SCP

-Copying file to host:

scp /some/local/file.txt username@minion.private.ugent.be:/some/remote/directory/

-Copying file from host to local directory:

scp username@minion.private.ugent.be:/some/remote/file /some/local/directory/

-Copying directory from host

scp -r user@minion.private.ugent.be:/some/local/directory/   /some/local/directory/

B. GUI

VIA FILEZILLA or other FTP client*   host: minion.private.ugent.be
user: yourusername
password: youraccountpassword
port: 22   *Windows users can also install WinSCP (https://winscp.net/eng/download.php), a free FTP and SCP client.  

VNC

Usage of VNC server is not encouraged. The server/work station is being used as for MinION sequencing and many parallel server sessions may take up much of the needed RAM memory.

Virtual Network Computing (VNC) is a graphical desktop sharing system that to remotely control another computer. On Django a VNC session will start the xfce4 desktop as a graphic user interface. When you close your VNC viewer on your local desktop all programs will keep running on the server and your server session remains the same when you login the next day.

RealVNC: install vncviewer from realvnc or tigervnc https://www.realvnc.com/download/viewer/

https://github.com/TigerVNC/tigervnc/releases

1. connect via ssh to django.ugent.be on linux:

ssh username@minion.private.ugent.be

on windows: use putty (http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html)  

2. Once logged in, start a vncserver session on the server using the following command:

vncserver -localhost no :an_available_vnc_number

or 

vncserver -localhost no

In the last case you will have to deduce your port number from the output:

So this means you need to use port :4 to connect to your vncserver session.

(For some vncviewer versions you might want to adapt your screen resolution)

vncserver -geometry 1600x1200 :an_available_vnc_number

Please note: a vncserver session takes up a considerable amount of RAM memory. Please check you do not run multiple vncserver sessions with:    

vncserver -list

3. connect using vncviewer  on your own laptop (with vpn connection on or while on the ugent network)

Please type the server adress with port:

minion.private.ugent.be:yourvncnumber

using realvnc

With right click you can tweak the options of your vncsession. (please let encryption at “Let VNC Server choose”)

Or using tigervncviewer (https://tigervnc.org/)

Typical vncviewer connection window (tigervncviewer). You can modify certain options, like resolution, view-only mode, … via the “options” button.

RealVNC: enter or double click
Tigervnc: push “connect”

Fill in your password  

Usual problem:   In case you are not able to launch a vnc session and you get an error message telling you there is session running, there is probably already a VNC session running on that port… Try to kill it.

vncserver -kill :an_available_vnc_number

If it tells you, you don’t have the right to kill it or it doesn’t find the .pid file, it probably is launched by another user. You can check all vncsessions running (and their ports) for example with the command:

ps -ef | grep "vnc"

Hard drive usage:

IMPORTANT: The server only can provide temporary working space! Please use a data server (eg. Ornette, UGENT shares …), cloud servers (eg. UGent One Drive,..) or external disks.

If you want direct access via your vncsession from django to the UGENT share(s) of your research group in order to directly transfer files for storage:  

1. Open File manager and browse to:   smb://<yourUGENTusername>@files.ugent.be/<yourUGENTusername>/  

2. Fill in when requested for workdomain and password:

– workdomain: UGENT

– Password: your ugent password  

Please note: you don’t need to fill the password and username of your django account, but that of your ugent account   You will get access to your ugent shares in your vncsession:  

  3. Click on the folder shares