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Full Discussion: 1 symbolic link to 2 different places?
Top Forums UNIX for Advanced & Expert Users 1 symbolic link to 2 different places? Post 39654 by malcom on Wednesday 27th of August 2003 04:57:48 AM
Old 08-27-2003
May be you can use additional IP adresses
Hi,

may be a little bit more work to do, but may be better is to you an additional IP Adress and DNS entry. For Server1 and/or Server2.

On Client side, you had never to change some thing. You only need one script on an third PC which is monitoring both servers, and when one server goes down, you will assign this special IP Adress with rsh or whatever on the other up and running system.

With this way, you can also implement a bigger high avaiblity environment.

Here the example:

Server1
eth0 : 192.168.0.1

Server2
eth0: 192.168.0.2

Normaly, Server1 is the main server for your filesystem, so you have an additonal IP Adress on it eth0:0 192.168.0.100 with the DNS name server.

All links are configured to server and not to server1 or server2.

IF the monitoring script detects the server1 is down or not avaible for what reason ever, it connects server2 with rsh or whatever and activated on server2 eth0:0 with the IP adress 192.168.0.100 and DNS name server.
with this way, for the clients nothing will change and everything goes well.

Regards
Alex
 

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LEARN ABOUT DEBIAN

tgt-setup-lun

tgt-setup-lun(8)					      System Manager's Manual						  tgt-setup-lun(8)

NAME

       tgt-setup-lun - creates a target, adds a device to the target and defines initiators that can connect to the target

SYNOPSIS

       tgt-setup-lun -d device -n target_name [initiator_IP1 initiator_IP2 ...] [-h]

DESCRIPTION

       Starts tgtd if necessary and creates a target according to the supplied target_name. The format of the target name is as follows:
       iqn.2001-04.com.<hostname>-<target_name> The target name must be unique.

       The  script then adds the requested device to the target. If specific IP addresses are defined, it adds them to the list of allowed initia-
       tors for that target. If no IP addresses is defined, it defines that the target accepts any initiator.

EXAMPLES

       Create a target that uses /dev/sdb1 and allows connections only from 192.168.10.81:
       tgt-setup-lun -d /dev/sdb1 -n my_target 192.168.10.81

       Create a target that uses /dev/sdb1 and allows connections only from 192.168.10.81 and 192.168.10.82:
       tgt-setup-lun -d /dev/sdb1 -n my_target 192.168.10.81 192.168.10.82

       Create a target that uses /dev/sdb1 and allows connections from any initiator:
       tgt-setup-lun -d /dev/sdb1 -n my_target

       Display help:
       tgt-setup-lun -h

AUTHOR

       Written by Erez Zilber

REPORTING BUGS

       Report bugs to <stgt@vger.kernel.org>

COPYRIGHT

       Copyright (C) Voltaire Ltd. 2008.

																  tgt-setup-lun(8)
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