Linux System Administration Recipes A Problem-Solution Approach

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CHAPTER 10 ■ THINGS GO IN, THINGS GO OUTIf you get a “Server is already active for display” error, check that you remembered to put :1 on theend. Otherwise, the server will default to :0, which conflicts with your existing desktop. You can also try:2 if there’s a conflict with :1.10-7. Using VNC or Similar to Log in RemotelyVirtual Network Computing (VNC) is the fuller-featured way of setting up the capability discussed in theprevious recipe. But it’s a little more hassle. For Debian/Ubuntu, you need to install the vnc4serverpackage on the remote machine and the xvnc4viewer package on the client machine.Setting up the server as shown here will again allow you to use GDM and VNC together so that youcan both log in and log out of your remote machine. First edit the GDM config file at/etc/X11/gdm/gdm.conf. Then add or edit the RemoteGreeter line:RemoteGreeter = /usr/bin/gdmgreeterand add a line after the [xdmcp] line:[xdmcp]Enable=trueNext, edit /etc/services to add a VNC service. Add this line at the end of the file:vnc5900/tcpNow create a file /etc/xinetd.d/vnc like this:service vnc{disable = nosocket-type = streamprotocol = tcpgroup = ttywait= nouser= nobody}server = /usr/bin/Xvncserver_args= -inetd -query localhost -geometry 1024x768 -depth 16 -once -fp unix/:7100 -securitytypes=none■ Note You can run multiple resolutions by adding extra lines to /etc/services. Here’s an example:vnc800 5901/tcp210Download at WoweBook.Com
CHAPTER 10 ■ THINGS GO IN, THINGS GO OUTThis copies the /etc/xinetd.d/vnc file to /etc/xinetd.d/vnc800 and then changes the -geometry section ofthe server_args line in this new file to -geometry 800x600.Now use chkconfig to remove the vncserver startup links from the init.d directories (becauseyou’re now using xinetd to run it instead), stop it in case it’s already running, and restart xinetd:# chkconfig --level 2345 vncserver off# /etc/init.d/vncserver stop# /etc/init.d/xinetd restartTo connect, use this line on the client machine:vncviewer remote.example.com:5900That should be all you need to get a GDM login screen for your remote machine, running at1024×768.If you don’t have access to init and inetd, you can also ssh to the machine and then run xvncserverfrom that session. This is a bit less maintainable than doing it as described. You can also use the clientvinaigre for a slightly better-featured experience, but this isn’t available for all systems: vinaigreremote.example.com:5900.211Download at WoweBook.Com
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Contents■About the Author .......
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■ CONTENTS3-7. Writing a Nagios P
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■ CONTENTS■Chapter 8: Using the
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■ CONTENTSAbout the Author■Juli
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■ CONTENTSAcknowledgmentsMany tha
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■ CONTENTSIntroductionThis book i
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■ INTRODUCTIONDownloading the Cod
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C H A P T E R 1■ ■ ■Saving Yo
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CHAPTER 1 ■ SAVING YOURSELF EFFOR
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C H A P T E R 2■ ■ ■Centraliz
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CHAPTER 2 ■ CENTRALIZING YOUR NET
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C H A P T E R 3■ ■ ■Monitorin
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CHAPTER 3 ■ MONITORING AND UPDATI
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C H A P T E R 4■ ■ ■Taking Ba
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CHAPTER 4 ■ TAKING BACKUPS AND MA
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C H A P T E R 5■ ■ ■Working w
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CHAPTER 5 ■ WORKING WITH FILESYST
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C H A P T E R 6■ ■ ■Securing
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CHAPTER 6 ■ SECURING YOUR SYSTEMS
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C H A P T E R 7■ ■ ■Working w
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Page 251 and 252: C H A P T E R 12■ ■ ■Managing
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Page 267 and 268: APPENDIX■ ■ ■Perl TipsSee rec
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Page 275 and 276: ■ INDEXenscript option (printing)
Page 277 and 278: ■ INDEX■NNagiosadding hosts to,
Page 279 and 280: ■ INDEXsyslogcentralized logging
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