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In some cases you will want to run cfengine on a system to configure it
from scratch. If the system is in a very bad way, it might not even be
able to parse the cfengine configuration file, perhaps because the
network was not properly configured or the DNS (Domain Name Service) was
out of action. To help prevent this situation, cfengine looks for a
cf.preconf which gets executed prior to parsing and
can be used to perform any emergency tests. This file needs only
contain enough to get the system to parse the configuration files.
cf.preconf may be any script in any language. It need not exist
at all! It is fed one argument by cfengine, namely the system hard-class
for the current system (e.g.
ultrix). Here is an example:
#!/bin/sh # # cf.preconf is an emergency/bootstrap file to get things going # in case cfengine is unable to parse its config file # backupdir=/iu/nexus/local/iu/etc # # If these files don't exist, you might not be able to parse cfagent.conf # if [ ! -s /etc/resolv.conf ]; then echo Patching basics resolv.conf file cat > /etc/resolv.conf << XX domain iu.hioslo.no nameserver 22.214.171.124 XX fi # # SVR4 # if [ "$1" = "solaris" ]; then if [ ! -s "/etc/passwd" ]; then echo Patching missing passwd file /bin/cp $backupdir/passwd /etc/passwd fi if [ ! -s "/etc/shadow" ]; then echo Patching missing passwd file /bin/cp $backupdir/shadow /etc/shadow fi fi # # BSD 4.3 # if [ "$1" = "linux" ]; then if [ ! -s "/etc/passwd" ] then echo Patching missing passwd file /bin/cp $backupdir/passwd.linux /etc/passwd fi fi
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