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To enable the VNC session running on display :1 for an oracle user on the SUSE server, please create the file called after.local in /etc/init.d with 775 rights, the file should look like that:
slestest:~ # cat /etc/init.d/after.local
#!/bin/sh
/bin/su oracle -c "/usr/bin/vncserver :1 &"
Just check that you have tightvnc installed:
slestest:~ # rpm -qa|grep vnc
xorg-x11-Xvnc-7.4-27.81.7
tightvnc-1.3.9-81.13.1
slestest:~ #
An easy method to do port forwarding without the iptables is to use the xinetd.
In order to port forward with xinetd, you will need to create a configuration file:
root# vim /etc/xinetd.d/imap_forward
For example: Forward port 143 on localhost to remote server on port 143:
service imap_forward
{
disable = no
type = UNLISTED
socket_type = stream
protocol = tcp
user = nobody
wait = no
redirect = remote_IP_or_server_name 143
port = 143
}
“Sometimes one wants to connect to a real X11 display (i.e. one attached to a physical monitor, keyboard, and mouse: a Workstation or a SunRay session) from far away. Maybe you want to close down an application cleanly rather than using kill, or want to work a bit in an already running application, or would like to help a distant colleague solve a problem with their desktop, or would just like to work out on the deck for a while. This is where x11vnc is useful.”
and here you can find a lot more information: http://www.karlrunge.com/x11vnc/
install x11vnc and then on remote machine as user type:
x11vnc -display :0
and then on your local machine type:
vncviewer IP
1. Install the tightvnc and xorg-x11-Xvnc packages:
root# zypper install tightvnc xorg-x11-Xvnc
Type the command vncserver to start the VNC server, and then type the command
vi $HOME/.vnc/xstartup
to open the VNC configuration file in the vi text editor. You can replace “vi” with your preferred text editor.
Add the line /usr/bin/gnome & under the #!/bin/sh line, if you are using the Gnome desktop.
Type the command vncserver in Suse 10 or dbus-launch vncserver in Suse 11, to start the VNC server. Take note of the desktop number, usually “:1,” “:2” or “:3,” that is shown after the command is executed.
2. Connect to the Server
Open the VNC viewer software on the remote computer. Type “192.168.1.100:1” in the connection text box. Replace “192.168.1.100” with the IP address of the Suse server. Replace “:1” with the desktop number from the previous section. and then type the password for the VNC server, when prompted.
Users who are logged on can start a server with a simple console command.
• Starting the server in Suse versions 10.x: vncserver
• Starting the server in Suse versions 11.x: dbus-launch vncserver
The vncserver command will start the next unused desktop in the sequence :1, :2, :3 …etc. You can attach many options to the command line when starting the server. There are options specific to TightVNC on the TightVNC man page and you can also attach the options listed in the Xvnc man page.
Note: vncpasswd allows you to set the password used to access VNC desktops. Its default behavior is to prompt for a VNC password and then store an obfuscated version of this password to passwd-file (or to $HOME/.vnc/passwd if no password file is specified.) The vncserver script runs vncpasswd the first time you start a VNC desktop, and it invokes Xvnc with the appropriate -rfbauth option. vncviewer can also be given a password file to use via the -passwd option. The password must be at least six characters long (unless the -f command-line option is used– see below), and only the first eight characters are significant. Note that the stored password is not encrypted securely – anyone who has access to this file can trivially find out the plain-text password, so vncpasswd always sets appropriate permissions (read and write only by the owner.) However, when accessing a VNC desktop, a challenge-response mechanism is used over the wire making it hard for anyone to crack the password simply by snooping on the network.
conf example:
server:/home/user/.vnc # cat xstartup
#!/bin/sh
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
xsetroot -solid grey
vncconfig -iconic &
xterm -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
twm &
Based on research work by the rdesktop project, xrdp uses the Remote Desktop Protocol to present a graphical login to a remote client. Xrdp can connect to a VNC server or another RDP server. To enable the xrdp you need to download and install the software xrdp RPMS,
Yast->Software->Software Managmen
and type xrdp in search tab and then install xrdp.
Also open the 3389 port on a firewall.
GoTo Yast's firewall module --> Allowed Services --> Select --> Remote Desktop Protocol --> Add.
The next step is to start the service.
If you want the service on permanently goto:
Yast --> System --> Services / Runlevels --> xrdp --> Enable
If you want the service occasionslly, enable it with sudo /usr/sbin/rcxrdp start
and turn it off with sudo /usr/sbin/rcxrdp stop
And then install on a remote machine Remmina, it is a remote desktop connection client able to display and control a remote desktop session. It supports multiple network protocols in an integrated and consistant user interface. Currently RDP, VNC, NX, XDMCP and SSH protocols are supported.
zypper install remmina
or
apt-get install remmina