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26Aug/081

Installing NinfG version 5

NinfG is an open source grid middleware which provides a programming framework for grid-based remote procedure calls (GridRPC). It is a reference implementation of the GridRPC API (application programming interface), allowing programmers to create applications that can call procedures/executables installed on remote computers. In particular, it provides client library APIs that can be used to control the execution of remote executables, running these executables remotely when necessary.

NinfG 5.0 is the latest version of NinfG. Unlike previous versions where the Globus Toolkit is required, NinfG 5.0 can now work with non-Globus grid environment. One of its new features is the ability to use SSH to do remote procedure calls via the invoke server mechanism. This is very handy since most Linux systems have already SSH in the default installation, so there is no need to install additional packages to use NinfG. The following paragraphs outline the installation of NinfG on a system running Linux.

Tagged as: globus toolkit, grid, gridRPC, Ninf-G, ssh Continue reading

19Aug/082

Using SSH for Passwordless Remote Login

Secure Shell or SSH is a network protocol allowing secure data exchanges between two networked devices. It is designed to replace Telnet, which sends information over the network in plain text making it susceptible to interception or eavesdropping. SSH, on the other hand, provides secure communication by encrypting the data sent over the network. It is typically used to login to a remote computer and to execute commands remotely. Aside from this, SSH can also be used to securely transfer files using scp or sftp, forward TCP ports, SSH tunneling, among others.

The following is my outline on how to use SSH for passwordless remote login. Of course, this is far from being complete and some of the things below may not work perfectly with your setup. There are many howtos regarding this topic and you should be able to find the one that is appropriate for your system.

Tagged as: passwordless login, ssh, ssh-add, ssh-agent, ssh-keygen Continue reading

1May/070

Problem running GTK applications remotely

This entry was originally posted in my old 360.yahoo.com blog.

I encountered this problem while testing a gtk application I developed. The application was installed in a remote machine, which could be accessed via ssh. Every time I ran the program, I got this error message "... BadWindow (invalid Window parameter) ...".

I initially thought that the problem was related to the X window system. After searching the Internet, I found out that the problem is an ssh issue, or more precisely, X11 and TCP forwarding in ssh. There are two possible solutions to resolve this problem:

using the -Y option in ssh. The -Y option enables trusted X11 forwarding. Note that the -X option also doesn't work. You can run ssh as follows:
[user] $ ssh -Y hostname
put "ForwardX11Trusted=yes" option in the ssh configuration file. The personal configuration for ssh can be placed in .ssh/config in your home directory ($HOME/.ssh/config)

With this, the problem was solved!

Tagged as: gtk, solutions, ssh, x11 No Comments