Kenneth: /* Installation */

2025-02-28T18:58:04Z

Installation

← Older revision		Revision as of 18:58, 28 February 2025
Line 32:		Line 32:
	TightVNC:		TightVNC:
	sudo apt install tightvncserver		sudo apt install tightvncserver

			Install fonts:
			sudo apt -y install xfonts-base xfonts-100dpi xfonts-75dpi

	== To hide vnc settings window ==		== To hide vnc settings window ==

Kenneth: /* Installation */

2025-02-26T17:07:46Z

Installation

← Older revision		Revision as of 17:07, 26 February 2025
Line 25:		Line 25:
	# centos 7:		# centos 7:
	sudo yum install tigervnc-server xterm		sudo yum install tigervnc-server xterm

			# or
			sudo apt install tigervnc-standalone-server


	TightVNC:		TightVNC:

Kenneth: /* Installation */

2025-02-22T22:06:30Z

Installation

← Older revision		Revision as of 22:06, 22 February 2025
Line 19:		Line 19:
	== Installation ==		== Installation ==

	yum install vncserver xterm twm		Old vncserver:
			sudo yum install vncserver xterm twm

			TigerVNC:
	# centos 7:		# centos 7:
	yum install tigervnc-server xterm		sudo yum install tigervnc-server xterm

	apt install tightvncserver		TightVNC:
			sudo apt install tightvncserver

	== To hide vnc settings window ==		== To hide vnc settings window ==

Kenneth: /* Set Resolution */

2022-07-27T23:22:36Z

Set Resolution

New page

== vnc ==

Virtual Network Computing

== vncserver ==

vncserver uses realvnc or tightvnc

== Simple Setup ==

Simple setup:
$ service vncserver start
$ vncpasswd
$ vncserver

To set password to empty: (need to have at least started vncserver once to get configs in place)
echo "" | vncpasswd -f > ~/.vnc/passwd

== Installation ==

yum install vncserver xterm twm
# centos 7:
yum install tigervnc-server xterm

apt install tightvncserver

== To hide vnc settings window ==

Change: (~/.vnc/xstartup)
#vncconfig -iconic &
vncconfig -nowin -iconic &

Also comment out the "xterm -geometry..." line so terminal doesn't start automatically.

== Desktop Mangager ==

=== KDE ===

To start KDE automatically:
$ vi ~/.vnc/xstartup
# replace "twm &" with...
startkde &

==== Sample KDE xstartup file ====
<nowiki>
#!/bin/sh

# Uncomment the following two lines for normal desktop:
# unset SESSION_MANAGER
# exec /etc/X11/xinit/xinitrc

[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
xsetroot -solid grey
vncconfig -nowin -iconic &
#xterm -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
#twm &
startkde &
</nowiki>

=== GNOME ===

To start GNOME automatically:
$ vi ~/.vnc/xstartup
# replace "twm &" with...
exec gnome-session &

=== xfce4 ===

yum install xfce4-session xfce-utils
apt-get install vnc4server xfce4

# CentOS 7:
yum install epel-release -y
#yum groupinstall "Xfce"
yum install xfce4-session

~/.vnc/xstartup:
<pre>
#!/bin/sh

# Uncomment the following two lines for normal desktop:
# unset SESSION_MANAGER
# exec /etc/X11/xinit/xinitrc

[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
xsetroot -solid grey
#vncconfig -iconic &
#x-terminal-emulator -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
#x-window-manager &
vncconfig -nowin -iconic &
xfconf-query -c xfce4-keyboard-shortcuts -p /xfwm4/custom/'<'Super'>'Tab -r
#xfce4-session &
startxfce4 &
xterm &
</pre>

Ubuntu: (auto configured after installing xfce)
<pre>
#!/bin/sh

xrdb $HOME/.Xresources
xsetroot -solid grey
#x-terminal-emulator -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
#x-window-manager &
# Fix to make GNOME work
export XKL_XMODMAP_DISABLE=1
/etc/X11/Xsession
</pre>

---

Fix tab completion not working: [http://blog.zerosum42.com/2011/10/tech-fixing-tab-key-in-vnc.html]
* Clearing this key from xfce4-settings-manager => window manager => keyboard fixes the problem, OR...
** Application Menu > Settings > Window Manager > Keyboard > clear "Switch window for same application"
* xfconf-query -c xfce4-keyboard-shortcuts -p /xfwm4/custom/'<'Super'>'Tab -r

https://www.starnet.com/xwin32kb/tab-key-not-working-when-using-xfce-desktop/

https://bugzilla.xfce.org/show_bug.cgi?id=10760

See Xfce bug 10760

To fix this,
* Open the Xfce Application Menu > Settings > Window Manager
* Click on the Keyboard Tab
* Clear the Switch window for same application setting

-

https://www.smork.info/blog/2015/06/10/fixing_bash_tab_completion_in_xfce.html

Edit the file ~/.config/xfce4/xfconf/xfce-perchannel-xml/xfce4-keyboard-shortcuts.xml

Find this line:
<property name="<Super>Tab" type="string" value="switch_window_key"/>
Change it to this:
<property name="<Super>Tab" type="empty"/>
Restart the VNC server:
vncserver -kill :1
vncserver

-

https://stackoverflow.com/questions/23418831/command-line-auto-complete-tab-key-not-work-in-terminal-for-ubuntu

Disable the behaviour of tab changing windows. This is done in the file ~/.config/xfce4/xfconf/xfce-perchannel-xml/xfce4-keyboard-shortcuts.xml by changing the line

<property name="<Super>Tab" type="string" value="switch_window_key"/>
to
<property name="<Super>Tab" type="empty"/>

Reboot or restart your VNC server (XFCE).

=== twm ===

Tab Window Manager

twm - mouse

yum install vncserver xterm twm
apt-get install xterm twm

~/.vnc/xstartup:
<pre>
...
twm &
xterm &
</pre>

If you get errors with fonts:
LANG=C twm

== Kill VNC Server ==

To kill a VNC server:
# where xxx is the display number (ie. :1)
vncserver -kill :xxx

==SSH tunnel==
SSH multiple tunnel:
For example the the first tunnel would be:

ssh -L 5901:localhost:4321 <user>@<gateway.machine>

and then on the gateway machine

ssh -L 4321:localhost:5901 <user>@<server.machine>

After setting up the tunnels, you can start the VNC client as usual

vncviewer -shared localhost:1

==Autostart VNC for Select User==

If you want to access your server via VNCServer, you can automatically start the VNCServer at startup. You have to select a user under which the server will be running. Then, edit
/etc/sysconfig/vncservers
and add your users line on the bottom:
VNCSERVERS="1:Username"

==Using usernames to login==
[http://www.linux-mag.com/id/1311 Simplifying Remote VNC Logins]

You will need to configure GDM to accept remote login requests.

== DISPLAY ==

export DISPLAY=:0
xterm &

==References==

* http://www.skullbox.net/vncserver.php
* http://faq.gotomyvnc.com/fom-serve/cache/56.html
* http://www.rhic.bnl.gov/RCF/UserInfo/Software/VNC/vnc.html
* http://www.linux-noob.com/forums/index.php?showtopic=2692
* http://tokyoahead.com/main/multifaq/index.php/65

Virtual Network Computing

== TightVNC ==

TightVNC: VNC-Compatible Free Remote Control / Remote Desktop Software - TightVNC: VNC-Compatible Free Remote Control / Remote Desktop Software

apt-get install tightvncserver

== Set Resolution ==

vncserver -geometry 1600x1200 -randr 1600x1200,1440x900,1024x768

Then resize with:

xrandr -s 1600x1200
xrandr -s 1440x900
xrandr -s 1024x768

---

Error:
RandR extension missing

Install xrandr dependency:
sudo apt-get install libxrandr-dev x11-xserver-utils

---

If you need to change the setting without restarting VNC server, I had good results with:

vncconfig -set RandR="1024x768,1600x900"

and then using xrandr to change resolution as fgregg suggested:

xrandr -s 1024x768
xrandr -s 1600x900

---

Ref: [https://superuser.com/questions/184338/how-to-change-screen-resolution-of-vnc-server-without-restarting-it]

== Resize VNC Session ==

Great for headless:

vnc_resize.sh:
<pre>
#!/bin/bash

if [ "$1" == "" -o "$2" == "" ] ; then
echo "Usage: [width] [height]"
exit 1
fi

DISP=`xrandr --prop | grep connected`
if [ $? -ne 0 ] ; then
echo "Run this from graphics session"
exit 1
fi

MODELINE=`cvt $1 $2 | tail -n 1 | sed 's/Modeline //'`
MODE=`echo $MODELINE | awk '{print $1}'`
DISP=`echo $DISP | awk '{print $1}'`

echo $MODELINE
echo $MODE
echo $DISP

xrandr --newmode $MODELINE
xrandr --addmode $DISP $MODE
xrandr --fb $1x$2
</pre>

1. Calculate the Modeline:
$ cvt 1440 900
Modeline "1440x900_60.00" 106.50 1440 1528 1672 1904 900 903 909 934 -hsync +vsyn

2. Create mode:
$ xrandr --newmode "1440x900_60.00" 106.50 1440 1528 1672 1904 900 903 909 934 -hsync +vsync

3. Find Display:
xrandr --prop
VGA-0 ...

4. Add Mode:
$ xrandr --addmode VGA-0 "1440x900_60.00"

5. Set Mode:
xrandr --fb 1440x900

== Remote Desktop Sharing ==

=== Vino ===

<pre>
sudo apt-get install vino dconf-editor

# as pi user...
gsettings set org.gnome.Vino require-encryption false
gsettings set org.gnome.Vino prompt-enabled false
gsettings set org.gnome.Vino authentication-methods "['none']"

## sudo su -
## cat > /etc/sudoers.d/vsrv.sh << "EOF"
## #!/bin/bash
## /usr/lib/vino/vino-server
## EOF
## chmod +x /etc/sudoers.d/vsrv.sh
##
## cat >> /etc/xdg/lxsession/LXDE/autostart << "EOF"
## @/etc/sudoers.d/vsrv.sh
## EOF

sudo su -
cat > /etc/xdg/autostart/vino-server.desktop << "EOF"
[Desktop Entry]
Name=Desktop Sharing
Comment=GNOME Desktop Sharing Server
Exec=/usr/lib/vino/vino-server
Terminal=false
Type=Application
X-GNOME-Autostart-Phase=Applications
X-GNOME-AutoRestart=true
NoDisplay=true
EOF
</pre>

RPi VNC Screen Sharing - eLinux.org - http://elinux.org/RPi_VNC_Screen_Sharing

== Screen Capture ==

=== vncdo ===

sibson/vncdotool · GitHub - https://github.com/sibson/vncdotool

"vncdotool is a command line VNC client. It can be useful to automating interactions with virtual machines or hardware devices that are otherwise difficult to control."

Screen capture:
vncdo -s myserver:0 -p mypassword capture 1.png capture 2.png

--

Install:
pip install vncdotool

--

Usage:
vncdo -s vncserveraddress type "hello world"
vncdo -s vncservername capture screen.png

--

More examples of usage:
* Usage — VNCDoTool 0.9.0.dev0 documentation - http://vncdotool.readthedocs.org/en/latest/usage.html

Putting it all together you can specify multiple actions on a single command line. You could automate a login with the following:
> vncdo type username key enter expect password_prompt.png
> vncdo type password move 100 150 click 1 expect welcome_screen.png

--

pypi - vncdotool 0.2.0 : Python Package Index - https://pypi.python.org/pypi/vncdotool/0.2.0

=== vncsnapshot ===

VNC Snapshot - http://vncsnapshot.sourceforge.net/
* VNCSnapshot | SourceForge.net - http://sourceforge.net/projects/vncsnapshot/

"VNC Snapshot is a command line utility for VNC (Virtual Network Computing) available from RealVNC, among others. The utility allows one to take a snapshot from a VNC server and save it as a JPEG file. Unix, Linux and Windows platforms are supported."

Example:
vncsnapshot some_server:1 -passwd vnc_passwd_file screenshot.jpg

Note: Read encrypted password from filename instead of from the console. The filename can be made with the vncpasswd utility included in the vncsnapshot distribution.

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