If you feel that you want to start the cluster installation process over from scratch in order to recover from irresolvable errors, you can do so with the start_over script located in the scripts subdirectory.
It is important to note that start_over is not an uninstaller. That is, start_over does not guarantee to return the head node to the state that it was in before OSCAR was installed. It does a ``best attempt'' to do so, but the only guarantee that it provides is that the head node will be suitable for OSCAR re-installation. For example, the RedHat 7.x series ships with a LAM/MPI RPM. The OSCAR install process removes this RedHat-default RPM and installs a custom OSCAR-ized LAM/MPI RPM. The start_over script only removes the OSCAR-ized LAM/MPI RPM - it does not re-install the RedHat-default LAM/MPI RPM.
Another important fact to note is that because of the environment manipulation that was performed via switcher from the previous OSCAR install, it is necessary to re-install OSCAR from a shell that was not tainted by the previous OSCAR installation. Specifically, the start_over script can remove most files and packages that were installed by OSCAR, but it cannot chase down and patch up any currently-running user environments that were tainted by the OSCAR environment manipulation packages.
Ensuring to have an untainted environment can be done in one of two ways:
Note that the logout/login method is strongly encouraged, as it may be difficult to otherwise absolutely guarantee that a given shell/window has an untainted environment.
root 2002-11-08