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Developing and Testing Code on VMWare with Island Servers

Learn how to develop and test your code on VMWare with Island Servers. Avoid infinite loops and fork bombs to ensure smooth operation. Use VMWare Basics and access your Linux virtual machine with ease.

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Developing and Testing Code on VMWare with Island Servers

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  1. CSE 451 – Operating Systems Section, Winter 2003 Scapegoats: Evan Welbourne (evan@cs) Albert J. Wong (awong@cs)

  2. Computing Resources Our “Special” Servers Island Servers coredump, spinlock • Develop your code on coredump, and spinlock. • Test your code on your VMWare install. • If you use fork in your code, MAKE SURE YOUR CODE DOES NOT INFINITE LOOP!!! If you aren’t sure, run it in vmware. NEVER EVER run it on the Island Server. • Every quarter some idiot fork bombs one of the island servers. It will not happen this quarter, or else… fiji, sumatra, ceylon, tahiti Orange tagged boxes DO NOT USE!!!! VMWare Use these instead

  3. Vmware Basics 1 • Start VMWare Start | VMWare | VMWare Workstation • Load the Linux VMWare Image File | Open c:\Program File\VMWare\vms\linux\linux

  4. Vmware Basics 2 Power functions (on, off, reset) • All disks are non-persistent. (look in the configuration) That means using the power functions for off and reset undo any changes to the disk. Do a soft reboot to preserve data!!! (“shutdown –r now”, or “reboot” from the shell instead of hitting the reset button) • Network Adapter is Host Only. This means that only the host computer can talk to the vmware network card. You have to transfer files (like your kernel) to the host machine first. Machine name VMWare config

  5. Accessing your Linux virtual machine • The super user (administrator) account on all Unix boxes is called “root” • The password to root on the vmware machines is “rootpassword” • ftp is the recommended method used to transfer files to and from vmware; there is no ssh daemon installed. The vmware ip address should be 192.168.93.2. To find the ip address type “ifconfig” (interface config) in the shell. • You can use explorer to ftp to vmware through the url ftp://root:rootpassword@192.168.93.2 If you decide to use another ftp method, remember to check binary mode. Otherwise you’ll get garbage instead of your file.

  6. M337 C What is C • C is a procedural language • This does not mean that you cannot write OO code. It just means that there is no native language support like classes. This is similar to Java having language features for synchronizing threads and C++ not. You can still do multithreaded code in C++ (and in C as you will soon find out first hand). Major syntactic differences in C • There are no classes. Structs are NOT the same classes as they are in C++. • You can only declare variables at the top of a block (after an opening brace) before any other kind of statement (except perhaps typedefs). • There is no new/delete operators. Only malloc and free functions. • You use void*s a lot in C data structures.

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