9.2 Target creation

First, you must check that Diogene87's daemon is running (see section 8.1 Start the deamon).

For diogene87, a target is a computer where jobs will be run. The `dio87d' daemon must be launched on each target computer. The system target `localhost' represents the local computer, this target can't be deleted.

We use the tl command to print the target list, and the ti command to print informations about the `localhost' target :

$ dio87c -- tl
localhost
$
$ dio87c -- ti localhost
Target name:    localhost
Description:    
Opened:         true
Host name : 
IP Port:        9993
$
$

If we want to create a target for a remote computer, we must call the ta command. For example, we can add a second target for the `egon' computer :

$ ping egon 
PING egon (192.168.0.1): 56 data bytes
64 bytes from 192.168.0.1: icmp_seq=0 ttl=255 time=0.6 ms
64 bytes from 192.168.0.1: icmp_seq=1 ttl=255 time=0.2 ms
--- egon ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 0.2/0.4/0.6 ms

$ dio87c -- ta egon
$ dio87c -- tl
localhost
egon
$

If the target name is too long (more than 60 characters) or if you want to keep short friendly name to define targets, you can use tsh command to define a long hostname for the target. For example, you can create a target named `my_computer' with a long host name (`a_very_long.name_for_a_computer.com') :

$ dio87c ta my_computer
$
$ dio87c tsh my_computer "a_very_long.name_for_a_computer.com"
$
$ dio87c ti my_computer
Target name:    my_computer
Description:
Host Name:      a_very_long.name_for_a_computer.com
IP Port:        9993
$

A target can be closed to stop the job execution : when a target is closed, new jobs which are submited are holded until the target is re-opened. The jobs which are running on the target before closing continue.

This feature is very useful if a computer must be halt. The operator closes the target and waits that running jobs finishes. He can quietly boot the server. When he is finished, he can re-open the target. Jobs which were holded will be run.