The State of Remote Desktops?

frenchgates writes "It became clear to me (when my main machine had to be sent away for repairs for a week) that it's high time to finally divorce myself from any particular computer by using data and software accessible from any internet connected computer as much as possible. I'm talking Visual IDEs, productivity apps, powerful, easy to use email client, etc, all presented to me consistently from computer to computer on my remote virtual desktop. Is anyone seriously trying this? What are the best practices and best applications? What are the biggest shortcomings? What if I limit my demand to "accessible from any internet connected Windows machine with Java installed?" Are there good web sites devoted to this noble goal?"

Comments

Use TightVNC if you want it a little faster.

[TimFreeman]

TightVNC is available here.

Re:VNC

[damien_kane]

I have used VNC before, and not only does it support acceptable refresh rates over a broadband connection, but it also had built in support for connectiong over a java client (if enabled) through its own server.
Because of this you can access it anywhere that you can open a browser.
I highly recommend it.

Remote Administrator ($hareware I believe) is also quite good.
I used it for a project when I was in school... My friend and I set up a VPN between two networks and a roaming host (my laptop on a dialup connection).
To display most of our data, as we required three internet connections (two networks + roaming host), we left our main setups at our houses and connected to them over Remote Administrator.
It worked well and we received 98% on our presentation.

Re:Windows XP

[SuiteSisterMary]

It's not great and if it's not a VPN you are open to being sniffed but it is very simple to use.

Really? Windows 2000 Terminal Services will quite happily encrypt itself at 128 bits, and is far more usable over modem than VNC tends to be.

TightVNC

[xTK-421x]

For all the people recommending VNC, I also recommend TightVNC. It's a branch of the VNC code except it's optimized for low bandwidth communication. I have found it to be much better than normal VNC. (Information below stolen from the homepage)

• Local cursor handling. Cursor movements do not generate screen updates any more, remote cursor movements are processed locally by the viewer, so you do not see remote cursor pointer moving too slow behind the local cursor.
• Efficient compression algorithms. New Tight encoding is optimized for slow and medium-speed connections and thus generates much less traffic as compared to traditional VNC encodings.
• Configurable compression levels. You can choose any appropriate level of compromise between compression ratios and coding speed, depending on the your connection speed and processor power.
• Optional JPEG compression. If you don't care too much about perfect image quality, you can enable JPEG coder which would compress color-rich screen areas much more efficiently (and image quality level is configurable too).
• Web browser access. TightVNC includes Java viewer with support for Tight encoding and local cursor feature (viewer applet may be accessed via built-in HTTP server as in the standard VNC).
• Operating under Unix and Windows. All new features listed above are available in both Unix and Win32 versions of TightVNC.
• Advanced Properties dialog in WinVNC. Unlike the standard VNC, TightVNC gives you a possibility to set a number of advanced settings directly from the WinVNC GUI, and to apply changed settings immediately. There is no need to launch regedit to set query options, connection priority, to allow loopback connections, disable HTTP server etc.
• Automatic SSH tunneling on Unix. Unix version of TightVNC viewer can tunnel connections via SSH automatically using local SSH or OpenSSH client installation.
• And more. A number of other improvements, performance optimizations and bugfixes, see WhatsNew and ChangeLog documents.

Re:VNC

[edgarde]

Citrix works nice if you got the $$. I've seen it in use but have never set it set up or administrated.

VNC works great with Windows & Linux clients, and Linux servers (Windows servers are limited to a single desktop at this time I believe). You need to install a VNC client, but I consider it the best alternative.

• details here
• screenshots cose we love 'em.

Another product called Tridia VNC (here's a review from UnixReview.com ) works in any browser supporting Java 2. I find it inadequate for most users because the screen refreshes are poor, but I use it for my stuff and I'm good whereever I go.

Well, it depends...

[Junta]

Are you still in control of the system hosting the remote desktop? Is there truly an expected higher reliability factor involved with that server? You need to carefully consider this question, as it may be the case that you are only buying yourself an imagined higher level of reliability.

If you can justify your assumption, then it depends on platform.

Under Unix systems, two very good tools come into play. screen provides very good abstraction for text based applications from controlling ptys. Now for X stuff, you are pretty much stuck with something like VNC. VNC is kinda bandwidth heavy, but tightVNC (wwww.tightvnc.com) really helps with low bandwidth. VNC is a recommendation *only* if you need guaranteed persistence of apps, even if the client machine crashes or you need to relocate and cannot afford to close the App. If you just need to pull up the apps as you need them, native X11 can be used pretty much from any client. From Windows you can use either Exceed or WeirdX (free), and you have remote access, but if your client machines goes haywire, so does your app. In this way, vnc could be considered analogous to X11 in the way screen in analogous to ssh or telnet, they both prevent client problems from destroying control or output of an application.

Now under Windows, Terminal Services can be used to fill this role. Your client disconnects and you can resume with another right where the screen left off. You might be able to get Citrix to do that as well, but my experience with Citrix has been more about providing X11-type functionality as opposed to VNC type reliability. VNC also works with Windows, but Terminal Services is a much more lightweight beast.

All this said, I personally use VNC on a Unix system for long term graphical applications. That way if I need to reboot my desktop for some reason, the VNC sessions and the various screen controlled terminals will be available for pickup at my next convenience.

Linux Terminal Server Project

[compumike]

The Linux Terminal Server Project is exactly what you're talking about. I've been using it at home here to play around with for a few months now. It's really slick. I have a bunch of my old computers that would otherwise be in the dumpster that are right now serving as terminals. And they're pretty fast, since all the apps run on my big Athlon box.

It works by netbooting from your server. Some kind of bootrom code, either on your network card or on a floppy disk, initalizes the network card. It uses DHCP to find its own IP address, and then it uses TFTP to download a small Linux kernel over the network. This loads up and uses an NFS-mounted root to run an X server on the local computer. The X server connects back to the main server by XDMCP, and you get your XDM/GDM/KDM login window.

The LTSP guys have done a great job packaging this all up. Take a look. And as for your requirement of running it on a Windows box, see Cygwin's XFree86 port to Windows. You can use it to connect with XDMCP. Of course, I don't know why you wouldn't just pop in a bootdisk...

The biggest drawback to this approach is remote access security. Look at that paragraph and how many daemons and services you need to have running. But I imagine that if it was secured well enough, it'd be fine. Actually, there is a way to make this all go over VNC (or VNC with compression). It's not as fast, but at least that's only one TCP port and a lot easier to get by firewalls.

There's a great bunch of guys working on this project. And its nice to be able to connect to #ltsp on irc.openprojects.net and get the lead developers to answer your questions.

Michael F. Robbins

Re:VNC

[compwiz3688]

I've installed TightVNC at work so that I could connect from home. There's that delicate balance between bandwidth usage and fast processing speed. If you set the compression too high, it takes a while to receive the screen updates (limited by cpu). Set it too low, and it takes a while to receive the screen updates (limited by bandwidth).

Oh, did I mention I installed it on a P2 233? Slow as hell over the Internet, but a bit more acceptable without the zlib/jpeg compressions over the 10mbit LAN. I've used the zlib (pure) encoding with maximum compression over the Internet and it's acceptable (on cable anyway).

But it ain't better than terminal server or XP remote desktop ;p

Yeah, well considering that TS only runs on the NT OSes, and *VNC support more, I'd go for *VNC.

Central Data

[fm6]

The problem is, even if you're doing everything remotely, you're pretty much stuck using one computer as a central repository for everything--programs and data.

I used to work at Sun, and that's precisely the approach they use for the corporate WAN. It's partly about being able to access your data from anywhere, but it's mainly about the difficult of backing up data that isn't on servers. (Though that always struck me as kind of strange, since Sun sells backup applications that catch workstation data.) Such a setup has obvious advantages, but there were glitches:

• The only way to enforce this policy is to be very, very sticky about who gets a superuser password for their own workstation. I guess that's fine for admin people, but it can be pretty painful if you're a technical type and need to do some tweaking.
• Any network or server issues, and everybody's in trouble. One amusing day, network traffic slowed to a crawl. Now, the standard text editor at Sun is a kitchen-sink implementation of XEMACS -- run entirely off the network. (Guess keeping it up to date was a priority!) Except for those who had their superuser passwords and had taken the time to do a local XEMACS, everybody found their editor stopping for about five minutes every time they did something that loaded a module. One guy who was on deadline had me come to his office and edit his files in Vi, according to changes he dictated to me.
• The whole setup requires a fairly complex NIS-driven automounter setup. The basic setup was quite sound, but basically broke if your automounter demon crashed -- and mine seemed to at least once a week. Worked out in the end: IS got tired of my service calls and let me have my superuser password!
• If all your apps are on a server, you have to live with the configuration decisions of whoever maintains the server. Sometimes not the right ones...
• We were always running short of disk space. Never mind that terrabytes of workstation disk space were going unused...

RTFM :)

[Outland Traveller]

Not to be annoying, but if you read the rsync docs (which I just happened to do today) it explains how to do a bi-directional sync. It's pretty trivial, no need for another tool.