MATLAB DISTRIBUTED COMPUTING SERVER 4 - SYSTEM ADMINISTRATORS GUIDE Manual do Utilizador descarregar pdf (Página 4)

2 Network Administration

Security Consid

erations

The parallel com

puting products do not provide any security measures.

Therefore, be aw

are of the following security considerations:

• MATLAB workers r

un as whatever user the administrator starts the node’s

mdce service un

der. By default, the mdce service starts as

root on UNIX

operating syst

ems, and as LocalSystem on Microsoft Windows operating

systems. Becau

se MATLAB provides system calls, users can submit jobs

that execute sh

ell commands.

• The mdce servic

e does not enforce any access control or authentication.

Anyone with lo

cal or remote access to the mdce services can start and stop

their workers

and job managers, and query for their status.

• The job manage

r does not restrict access to the cluster, nor to job and task

data. Using a t

hird-party scheduler instead of the MathWorks job manager

could allow y

ou to take advantage of the security measures it provides.

• The parallel

computing processes must all be on the same side of a Þrewall,

or you must ta

ke measures to enable them to communicate with each

other throug

h the Þrewall. Workers running tasks of the same parallel

job cannot b

e Þrewalled off from each other, because their MPI-based

communicat

ion will not work.

• If certain p

orts are restricted, you can specify the ports used for parallel

computing.

See “DeÞning the Script Defaults” on page 2-13.

• If your netw

ork supports multicast, the parallel computing processes

accommoda

te multicast. However, because multicast is disabled on many

networks f

or security reasons, you might require unicast communication

between pa

rallel computing processes. Most examples of parallel

computing

scripts and functions in this documentation show unicast usage.

• If your org

anization is a member of the Internet Multicast Backbone

(MBone),

make sure that your parallel computing cluster is isolated from

MBone acc

ess if you are using multicast for parallel computing. This is

generall

y the default condition. If you have any questions about MBone

membersh

ip, contact your network administrator.

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