High availability of a process between two Linux servers Post: 302979163

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Top Forums Shell Programming and Scripting High availability of a process between two Linux servers Post 302979163 by stomp on Wednesday 10th of August 2016 08:26:28 AM

08-10-2016

Registered User

Hi Mahesh,

doing HA with a simple shell-script may sound convenient for a first start, but a fast hacked together shell script is probably not at all what you want to do when you have HA in mind.

If you want to do it right, use corosync and pacemaker or some other HA-toolstack to build a stable cluster. That's not easy and requires considerable effort to learn, but it is a solid and stable solution.

A simple but far less hacky method than own shell scripts is using UCARP. UCARP is a small piece of software that hooks 2 or more servers together which check if each other is reachable. The "primary" node sets up the configured service ip and can launch an "up-script" after taking the service ip. So the connection between service-ip and service is a fairly good for such a type of easy-peasy-HA. I did that and the advantage of this is that UCARP is very easy to configure. The whole handling of who is master, who is slave and who is reachable and who not is done by UCARP.

Last edited by stomp; 08-10-2016 at 06:49 PM..

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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