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Top Forums UNIX for Beginners Questions & Answers Answers to Frequently Asked Questions Tips and Tutorials My "Bread and Butter" Process Keep Alive Perl Script.... Post 60062 by Neo on Saturday 8th of January 2005 04:17:38 AM
Old 01-08-2005
My "Bread and Butter" Process Keep Alive Perl Script....

For the newbies, I should have posted this years ago....

Here is the standard (tiny) "bread and butter" perl script (on Linux) I use in my crontab files to insure key processes are alive ( just in case ! ) like httpd, named, sshd, etc.

The example below if for named......

Code:
#!/usr/bin/perl

open(PS,"/bin/ps x|") || die "Can't Open PS";
while(<PS>) {
if (/usr\/sbin\/named/) { close PS; exit;}
}
close PS;
system("/usr/sbin/named");

One of my biggest "server fears" is that named will die for some strange reason, so I feel safe knowing that named is always running with the script above.

New Linux/UNIX users might find it useful.
 

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named-xfer(8)						      System Manager's Manual						     named-xfer(8)

NAME
named-xfer - Pulls BIND zones from another server SYNOPSIS
/usr/sbin/named-xfer -z zone_to_transfer -f db_file -s serial_no [-d debug_level] [-l debug_log_file] [-t trace_file] [-p port] [-S] servers... OPTIONS
Specifies the name of the BIND zone for the named-xfer daemon to transfer, for example, dec.com. This option is required to pull a zone. Specifies the name of the file into which the pulled zone information is placed. This option is required to pull a zone. Specifies the current serial number of the SOA record for the zone zone_to_transfer. If serial_no is set to 0, the zone is always pulled. This option is required to pull a zone. Sets the debug level and determines the amount of debug information to be displayed. Specifies the file that will contain any debug messages from the zone pull. Specifies the file that will contain a trace from the zone pull. Specifies the port that will be used instead of the default name server port listed in /etc/services. Performs a restricted transfer of only the SOA, NS records and glue A records for the zone. The SOA record is not loaded by named, but is used to determine when to verify the NS records. See named(8) for more information. Specifies a list of Internet addresses, in dotted-quad format, from which to pull a zone. If the first host cannot be reached, the named transfer daemon tries to pull the zone from the next host listed. DESCRIPTION
The named transfer daemon, /usr/sbin/named-xfer, is a server that is usually run by the named daemon, /usr/sbin/named, but it can also be run manually with the given arguments. The named transfer daemon runs on a BIND secondary server and pulls BIND zones from a primary server. This daemon is not run by default, nor can it be started up from inetd(8). SEE ALSO
Commands: named(8) Files: resolver(4), services(4) named-xfer(8)
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