Services
========

Login cluster
-------------

The login cluster allows users to run interactive programs.  The
cluster consists of several nodes `llcN.psi.ch`, where N is 1, 2,
or 3.  There is also a load-balancer, `llclb1.psi.ch`, which uses IPVS
with a round robin policy to distribute incoming connections.


Jump hosts
----------

Many servers can only be accessed via SSH through one of the two jump
hosts, `wmgt01.psi.ch` and `wmgt02.psi.ch`.  These two systems require
two-factor authentication (currently using a Cryptocard dongle) and
offer a very restricted environment.