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Full Discussion: How to check if the script is already running?
Top Forums UNIX for Beginners Questions & Answers How to check if the script is already running? Post 302990721 by RudiC on Tuesday 31st of January 2017 07:08:40 AM
Old 01-31-2017
Let me see if I understand the request correctly: You have a NAS mounted on a number of servers sharing a shell script on that NAS. Only one single server is allowed to run one instance of the script at a given point in time, all others should be locked out during that run. The result is server dependent and should be stored locally on the respective server.
As it is many servers, local lock mecanisms won't work. Unless the OS offers lock mechanisms across all servers, you have to create one on your own.
Reading through your posts, I'm not sure if you differentiate between the lock file and the result file. You need both of them. While you can store the results locally, you should create the lock file some place available to all servers. One example - not being everybody's preferred choice - would be the script's path on the NAS, or e.g. a "lock" directory thereunder. You could use a simple file name, or a "personalized" one as Corona688 proposed, and use Scrutinizer's trap to remove it at script exit - not forgetting for the "normal", healthy script end.
No running scripts should be killed by the mechanism, but the nth instance should quit graciously when it sees another instance running, possibly logging such event when quitting.
 

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LEARN ABOUT DEBIAN

dhcp6relay

DHCP6RELAY(8)						    BSD System Manager's Manual 					     DHCP6RELAY(8)

NAME

     dhcp6relay -- DHCPv6 relay agent

SYNOPSIS

     dhcp6relay [-Ddf] [-b boundaddr] [-H hoplim] [-r relay-IF] [-s serveraddr] [-S script-file] [-p pid-file] interface ...

DESCRIPTION

     dhcp6relay acts as an intermediary to deliver DHCPv6 messages between clients and servers, and is on the same link as a client.  dhcp6relay
     needs command line arguments interface ..., which specifies the list of links accommodating clients.

     Options supported by dhcp6relay are:

     -d      Print debugging messages.

     -D      Even more debugging information is printed.

     -f      Foreground mode (useful when debugging).  Although dhcp6relay usually prints warning, debugging, or error messages to syslog(8), it
	     prints the messages to standard error if this option is specified.

     -b boundaddr
	     Specifies the source address to relay packets to servers (or other agents).

     -H hoplim
	     Specifies the hop limit of DHCPv6 Solicit messages forwarded to servers.

     -r relay-IF
	     Specifies the interface on which messages to servers are sent.  When omitted, the same interface as interface will be used.  When
	     multiple interface are specified, this option cannot be omitted.

     -s serveraddr
	     Specifies the DHCPv6 server address to relay packets to.  If not specified, packets are relayed to ff05::1:3 (All DHCPv6 servers).

     -S script-file
	     Specifies the script file to be executed when dhcp6relay receives a RELAY-REPLY message from a DHCPv6 server.  Further detail of the
	     script file syntax is available in dhcp6c(8)

     -p pid-file
	     Use pid-file to dump the process ID of dhcp6relay.

FILES

     /var/run/dhcp6relay.pid  is the default file that contains pid of the currently running dhcp6relay.

SEE ALSO

     dhcp6c(8), dhcp6s(8)

     Ralph Droms, Editor, Dynamic Host Configuration Protocol for IPv6 (DHCPv6), RFC 3315, 2003.

HISTORY

     The dhcp6relay command first appeared in WIDE/KAME IPv6 protocol stack kit.

KAME
								   Apr 18, 2000 							      KAME
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