Hi,
as there was no answer to my first mail, I try again with other words:
Our machines may have one or more aliases (virtual hosts) which all have DNS-entries. Normally we refer to the machines not using the hostname but by the alias, each of them combined to a bundle of functions and tasks. So a machine "frodo.xxx.de" might host "webserver.xxx.de", "dnsserver.xxx.de" and "tolkserver.xxx.de". These aliases and of course the tasks related to them are transferred to another machine in case of hardware failure, maintenance, etc. In bb-hosts we have an entry for each machine (to get data from this machine in case there is no alias set on it) and of course for all relevant aliases. What we need now is that the general client data (cpu, disk, ssh, ...) for each machine appears both with the hostname and all aliases set on it. I added a script to runclient.sh which creates ~/client/etc/clientlaunch.cfg dynamically according to the aliases set on the machine before starting the client. This assures that the correct data is polled on the client. I may modify $MACHINE or Í may use the CLIENT:hostname tag in bb-hosts to make the client send messages with a different name. But that would require several instances of the client running, somethin I dislike. I hope there is a way to send the client data once and to make the server look at some configuration file to see where he should present these data. Maybe that possibility exists but I haven't found it yet. So I hope that someone could indicate me where to search for the places which I have to "hack" hoping that it is possible to do that with shell or perl as my C-knowledge isn't so good. But even if C is necessary: Any hints are appreciated.
Thanks Rolf
-- Mit freundlichen Gruessen Rolf Schrittenlocher
HRZ/BDV, Senckenberganlage 31, 60054 Frankfurt Tel: (49) 69 - 798 28908 Fax: (49) 69 798 2881 LBS: lbs-f at mlist.uni-frankfurt.de Persoenlich: schritte at rz.uni-frankfurt.de
Rolf,
I asked a similar question many months ago for our Digital UNIX (4.x) boxes running in multiple clusters. I did not get any answer, so I had to create a hack that does run multiple clients on each host. One client is for the physical host and does, cpu, disk, etc, and one client for the logical/virtual host that does the tasks specific to the logical/virtual host. The runclient.sh script runs every ten minutes via crontab, to make sure both clients are running and starts either client if they are not. I also have custom versions of some of the default Hobbit client scripts to support multiple clients on a single host. So in short as far as I know, you are going to have to hack/script your own solution. I don't mind sending you what my hobbit scripts have turned into, but it may not be what you are looking for.
David Gore
*e-mail via SUSE Linux 9.3 and other open source tools.
Rolf Schrittenlocher wrote:
Hi,
as there was no answer to my first mail, I try again with other words:
Our machines may have one or more aliases (virtual hosts) which all have DNS-entries. Normally we refer to the machines not using the hostname but by the alias, each of them combined to a bundle of functions and tasks. So a machine "frodo.xxx.de" might host "webserver.xxx.de", "dnsserver.xxx.de" and "tolkserver.xxx.de". These aliases and of course the tasks related to them are transferred to another machine in case of hardware failure, maintenance, etc. In bb-hosts we have an entry for each machine (to get data from this machine in case there is no alias set on it) and of course for all relevant aliases. What we need now is that the general client data (cpu, disk, ssh, ...) for each machine appears both with the hostname and all aliases set on it. I added a script to runclient.sh which creates ~/client/etc/clientlaunch.cfg dynamically according to the aliases set on the machine before starting the client. This assures that the correct data is polled on the client. I may modify $MACHINE or Í may use the CLIENT:hostname tag in bb-hosts to make the client send messages with a different name. But that would require several instances of the client running, somethin I dislike. I hope there is a way to send the client data once and to make the server look at some configuration file to see where he should present these data. Maybe that possibility exists but I haven't found it yet. So I hope that someone could indicate me where to search for the places which I have to "hack" hoping that it is possible to do that with shell or perl as my C-knowledge isn't so good. But even if C is necessary: Any hints are appreciated.
Thanks Rolf
Hi,
we solved our multiple hosts problem with a workaround. Thanks to Adam,
Alexander and David for hints.
We are using now the same approach as David, running several instances
of hobbitlaunch on the client if necessary. Boiling down the
modifications in runclient.sh to the central part is:
...
ext/create_startlist.ksh
...
case "$CMD" in
"start")
for MACHINE in cat $HOBBITCLIENTHOME/etc/startlist
do
export $MACHINE
...
$HOBBITCLIENTHOME/bin/hobbitlaunch
--config=$HOBBITCLIENTHOME/etc/clientlaunch.${MACHINE}.cfg
--log=$HOBBITCLIENTHOME/logs/clientlaunch.${MACHINE}.log
--pidfile=$HOBBITCLIENTHOME/logs/clientlaunch.${MACHINE}.pid
...
done
startlist is created according to the aliases set on the host.
Thanks to all who contribute to this list and special thanks to Henrik for his efforts and this great tool. Rolf
Hi,
as there was no answer to my first mail, I try again with other words:
Our machines may have one or more aliases (virtual hosts) which all have DNS-entries. Normally we refer to the machines not using the hostname but by the alias, each of them combined to a bundle of functions and tasks. So a machine "frodo.xxx.de" might host "webserver.xxx.de", "dnsserver.xxx.de" and "tolkserver.xxx.de". These aliases and of course the tasks related to them are transferred to another machine in case of hardware failure, maintenance, etc. In bb-hosts we have an entry for each machine (to get data from this machine in case there is no alias set on it) and of course for all relevant aliases. What we need now is that the general client data (cpu, disk, ssh, ...) for each machine appears both with the hostname and all aliases set on it. I added a script to runclient.sh which creates ~/client/etc/clientlaunch.cfg dynamically according to the aliases set on the machine before starting the client. This assures that the correct data is polled on the client. I may modify $MACHINE or Í may use the CLIENT:hostname tag in bb-hosts to make the client send messages with a different name. But that would require several instances of the client running, somethin I dislike. I hope there is a way to send the client data once and to make the server look at some configuration file to see where he should present these data. Maybe that possibility exists but I haven't found it yet. So I hope that someone could indicate me where to search for the places which I have to "hack" hoping that it is possible to do that with shell or perl as my C-knowledge isn't so good. But even if C is necessary: Any hints are appreciated.
Thanks Rolf
-- Mit freundlichen Gruessen Rolf Schrittenlocher
HRZ/BDV, Senckenberganlage 31, 60054 Frankfurt Tel: (49) 69 - 798 28908 Fax: (49) 69 798 2881 LBS: lbs-f at mlist.uni-frankfurt.de Persoenlich: schritte at rz.uni-frankfurt.de
participants (2)
-
David.Gore＠mci.com
-
Schrittenlocher＠rz.uni-frankfurt.de