[Pacemaker] Howto write a STONITH agent

[Bob Haxo]

Hi Christoph,

Have you taken a look in /usr/lib64/stonith/plugins/external?

The "ipmi" plugin might serve as a coding example/template. Or maybe the
"drac5" plugin. At first glance, "drac5" appears to be using ssh.

Bob Haxo


On Thu, 2011-01-13 at 21:09 +0100, Christoph Herrmann wrote:
> Hi,
> 
> I have some brand new HP Blades with ILO Boards (iLO 2 Standard Blade Edition 1.81 ...)
> But I'm not able to connect with them via the external/riloe agent.
> When i try:
> 
> stonith -t external/riloe -p "hostlist=node1 ilo_hostname=ilo1  ilo_user=ilouser ilo_password=ilopass ilo_can_reset=1 ilo_protocol=2.0 ilo_powerdown_method=power" -S
> 
> I get the following answer:
> 
> external/riloe[14317]: ERROR: unknown power method %s, setting to "power"
> external/riloe[14317]: ERROR: [Errno -2] Name or service not known, while talking to ilo_hostname=ilo1
> 
> ** (process:14315): CRITICAL **: external_run_cmd: Calling '/usr/lib64/stonith/plugins/external/riloe status' returned 1
> 
> ** (process:14315): CRITICAL **: external_status: 'riloe status' failed with rc 1
> stonith: external/riloe device not accessible.
> 
> 
> But I can access ilo1 with http, https and ssh. The easiest way to reset a node is to run:
> 
> ssh -i ilo-sshkey ilouser at ilo1 reset system1 
> 
> I thouhgt it is easier to write a new ssh-ilo agent (I'm almost done :-) than debugging the existing one. But I'm looking for a short howto. I've read some STONITH agents, but they are not completely self-explaining and I have some questions. Is there a short howto write a stonith agent manual which google and I were not able to find?
> Or should I post all questions to the list?
> here we go:
> 
> 1. (and most important): What does the status check do, if you have an agent which runs as cloned resource (my ssh-ilo agent should run as a cloned resource). Does it check all nodes? Is it possible to check the status of a single node?
> 2. What are the expected return codes?
> 
> more to follow ;-)
> 
> 
> 
> 
> regards
> 
> 
>    Christoph &:-)